Type SFMT Circuit Breaker
Spring Mechanism
Single Break SF6 Puffer Type
100SFMT32LE
120SFMT32LE
100SFMT32HLE
120SFMT32HLE
Instruction Book
PEB0084
Rev. D 03/06
All possible contingencies which may arise during installation, operation, or maintenance, and
all details and variations of this equipment are not claimed to be covered by these instructions.
If further information is desired by the purchaser regarding the installation, operation, or
maintenance of his particular equipment, the Mitsubishi Electric Power Products’
Representative should be contacted.
Mitsubishi Electric Power Products, Inc. — 512 Keystone Drive — Warrendale, PA 15086
866-390-6487 — 724-772-2555
Mitsubishi Electric Power Products, Inc.
Rev E. 04/01
PEB0077 Circuit Breaker
Table of Contents
TABLE OF CONTENTS
SECTION 1 — INTRODUCTION ..................................................................................................... 1-1
1.1 General ...................................................................................................................................... 1-1
1.2 Caution ...................................................................................................................................... 1-2
1.3 Scope ......................................................................................................................................... 1-2
SECTION 2 — RECEIVING , HANDLING, STORING .................................................................... 2-1
2.1 Receiving .................................................................................................................................... 2-1
2.2 Handling and Unpacking ............................................................................................................ 2-1
2.3 Storage ...................................................................................................................................... 2-1
2.3.1 Short Term Storage (less than 3 months) .................................................................... 2-1
2.3.2 Long Term Storage ..................................................................................................... 2-1
SECTION 3 — DESCRIPTION ....................................................................................................... 3-1
3.1 Type SFMT Circuit Breaker ...................................................................................................... 3-1
3.2 Sulfur Hexafluoride (SF6) Gas ................................................................................................... 3-2
3.2.1 Description ..................................................................................................................
3.2.2 Precautions Handling Arced SF6 ................................................................................
3.2.3 Handling of Sulfur Hexafluoride ..................................................................................
3.2.4 Greenhouse Gas ..........................................................................................................
3.2.5 Material Safety Data Sheet .........................................................................................
3.3 Pole Unit ....................................................................................................................................
3-2
3-2
3-3
3-3
3-3
3-4
3.4 Interrupter .................................................................................................................................. 3-5
3.4.1 Closed Condition ........................................................................................................
3.4.2 Opening Operation .....................................................................................................
3.4.3 Closing Operation .......................................................................................................
3.5 Mechanical Linkage ...................................................................................................................
3-5
3-5
3-5
3-6
3.6 Spring Operated Mechanism ..................................................................................................... 3-7
3.6.1
3.6.2
3.6.3
3.6.4
3.6.5
3.6.6
3.6.7
Closed Position, View A ............................................................................................. 3-7
Opening Operation, View A and B ............................................................................. 3-7
Closing Operation, View C ........................................................................................ 3-7
Charging of the Closing Spring ................................................................................... 3-9
Shock Absorber .......................................................................................................... 3-9
Safety Pins .................................................................................................................. 3-9
Accessories ................................................................................................................. 3-9
Mitsubishi Electric Power Products, Inc.
PEB0084 Rev. D 03/06
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100/120SFMT32LE/32HLE Circuit Breaker
3.7 Mechanism Housing ................................................................................................................. 3-10
3.8 Electrical Control and Auxiliary System .................................................................................... 3-11
3.8.1 Trip Circuit ................................................................................................................. 3-11
3.8.2 Close Circuit .............................................................................................................. 3-11
3.8.3 Gas Lockout Circuit ................................................................................................. 3-12
3.8.4 Charging of Closing Spring ....................................................................................... 3-12
3.8.5 Housing Heaters ....................................................................................................... 3-12
3.9 SF6 Gas System ....................................................................................................................... 3-13
3.9.1 SF6 Gas Density ....................................................................................................... 3-13
3.9.2 Gas Density Switch ................................................................................................... 3-14
3.9.3 SF6 Gas Pressure Gauge .......................................................................................... 3-15
3.9.4 SF6 Gas Seals ........................................................................................................... 3-16
3.9.5 Absorbent ................................................................................................................. 3-16
3.9.6 Gas Adapter .............................................................................................................. 3-16
3.10 Bushing Assembly .................................................................................................................. 3-17
3.11 Current Transformer Assembly .............................................................................................. 3-18
SECTION 4 — CIRCUIT BREAKER OPERATION ....................................................................... 4-1
4.1 Electrical Operation .................................................................................................................... 4-1
4.2 Emergency Operation ................................................................................................................. 4-1
SECTION 5 — INSPECTION AND MAINTENANCE ....................................................................... 5-1
5.1 Inspection Program .................................................................................................................... 5-1
5.2 Maintenance Precautions ........................................................................................................... 5-2
5.3 Inspection Checklist .................................................................................................................. 5-3
5.4 Tools and Material ..................................................................................................................... 5-5
5.4.1 Tools ............................................................................................................................ 5-5
5.4.2 Material ...................................................................................................................... 5-5
5.5 SF6 Gas System ........................................................................................................................ 5-6
5.5.1
5.5.2
5.5.3
5.5.4
5.5.5
5.5.6
2
Adding SF6 Gas ........................................................................................................... 5-6
SF6 Gas Removal and Filling ...................................................................................... 5-6
Gas Leak Inspection ................................................................................................... 5-6
Gas Pressure Switch Inspection ................................................................................. 5-6
Gas Moisture Control ................................................................................................. 5-7
Renewal of Absorbent ................................................................................................ 5-7
PEB0084 Rev. D 03/06
Table of Contents
5.6 Mechanism and Linkage Inspection ........................................................................................... 5-8
5.6.1 Manual Jack Assembly ................................................................................................ 5-8
5.6.1.1 Assembling Hand Jack Assembly ...................................................................... 5-8
5.6.1.2 Manual Opening ................................................................................................ 5-9
5.6.1.3 Manual Closing .................................................................................................. 5-9
5.6.1.4 Manual Charging of the Closing Spring ............................................................. 5-9
5.6.2 Mechanism Lubrication .............................................................................................. 5-10
5.6.3 Mechanism Adjustments ............................................................................................. 5-11
5.6.3.1 Mechanism Travel ............................................................................................. 5-11
5.6.3.2 Cam Clearance ................................................................................................ 5-12
5.6.4 Trip Coil Assembly ..................................................................................................... 5-12
5.6.5 Closing Coil Assembly ............................................................................................... 5-13
5.7 Interrupter ................................................................................................................................ 5-14
5.7.1
5.7.2
5.7.3
5.7.4
External Interrupter Inspection .................................................................................
Internal Contact Inspection .......................................................................................
Removing Arc Contacts and Nozzle .........................................................................
Reassembling Arc Contacts and Nozzle ...................................................................
5-14
5-15
5-17
5-18
SECTION 6 — INSTALLATION ...................................................................................................... 6-1
6.1 Installation Material and Tools ................................................................................................... 6-1
6.1.1 Supplied With Circuit Breaker .................................................................................... 6-1
6.1.2 Supplied by Purchaser ................................................................................................ 6-1
6.2 Installation Procedure and Checklist .......................................................................................... 6-2
6.3 Installation of Circuit Breaker .................................................................................................... 6-3
6.3.1 Foundation and Subframe ...........................................................................................
6.3.2 Circuit Breaker ...........................................................................................................
6.3.3 SF6 Gas Filling ............................................................................................................
6.3.4 Wiring Connection ......................................................................................................
6.3.5 Manual Circuit Breaker Operation .............................................................................
6.4 Installation Testing and Inspection ..............................................................................................
6-3
6-4
6-4
6-4
6-4
6-5
6.4.1 Contact Resistance .....................................................................................................
6.4.2 SF6 Gas Leak Test......................................................................................................
6.4.3 SF6 Pressure Switch Test ............................................................................................
6.4.4 Operation Test ............................................................................................................
6.4.5 Timing Tests ................................................................................................................
6.4.6 Final Inspection ...........................................................................................................
6-5
6-5
6-5
6-5
6-6
6-6
Mitsubishi Electric Power Products, Inc.
PEB0084 Rev. D 03/06
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100/120SFMT32LE/32HLE Circuit Breaker
SECTION 7.0 — P ERFORMANCE SPECIFICATION .................................................................... 7-1
APPENDICES GENERAL PROCEDURES ................................................................................... AGP-1
APPENDIX A — SF6 GAS SEALS .............................................................................................. A-1
A.1 Material ..................................................................................................................................... A-1
A.2 Installation of O-ring ................................................................................................................. A-1
A.3 Applying the Gas Sealant .......................................................................................................... A-1
A.4 General Precautions .................................................................................................................. A-1
A.5 Small SF6 Gas Seals .................................................................................................................. A-1
APPENDIX B — TORQUING
OF
BOLTS ..................................................................................... B-1
B.1 Torque Values ............................................................................................................................ B-1
B.2 Torquing Sequence ( 1-2-3-4. etc.) .......................................................................................... B-2
APPENDIX C — L UBRICATING .................................................................................................... C-1
C.1 Application of Lubricants .......................................................................................................... C-1
C.2 Procedure .................................................................................................................................. C-1
APPENDIX D — APPLICATION OR REPLACEMENT OF ABSORBENTS .................................... D-1
D.1 Purpose of Absorbent ............................................................................................................... D-1
D.2 General Cautions ....................................................................................................................... D-1
D.3 Absorbent Material and Accessories ......................................................................................... D-1
D.4 Procedure .................................................................................................................................. D-1
APPENDIX E — FILLING, REMOVAL, AND LEAK DETECTION OF SF6 ................................ E-1
E.1 Gas Handling Equipment ............................................................................................................ E-1
E.2 Evacuating and SF6 Gas Filling Adapters ................................................................................... E-1
E.3 Evacuating and SF6 Gas Filling ................................................................................................... E-2
E.3.1 Evacuation .................................................................................................................. E-2
E.3.2 Vacuum Leak Check .................................................................................................. E-3
E.3.3 Gas Filling ................................................................................................................... E-3
E.4 Adding SF6 Gas ......................................................................................................................... E-4
E.5 Removal of SF6 Gas .................................................................................................................. E-4
E.5.1 Salvaging ...................................................................................................................... E-6
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PEB0084 Rev. D 03/06
Table of Contents
E.6 Leak Inspection .......................................................................................................................... E-6
E.6.1 Leak Check with Leak Test Solution ........................................................................... E-6
E.6.2 SF6 Leak Detector ...................................................................................................... E-6
E.6.3 Leak Test with Pressure Gauge (Long Term) .............................................................. E-8
APPENDIX F — WEATHER SEALING .......................................................................................... F-1
F.1 Weather Sealant Material ........................................................................................................... F-1
F.2 Application ................................................................................................................................. F-1
F.3 General Cautions ........................................................................................................................ F-1
F.4 External Joints ............................................................................................................................ F-1
F.5 Attaching Nameplates, etc. ........................................................................................................ F-2
F.6 Sealing Pipe Entrance ................................................................................................................ F-2
APPENDIX G — APPLICATION OF ELECTRICAL JOINT C OMPOUND .................................... G-1
G.1 Scope ........................................................................................................................................ G-1
G.2 Procedure .................................................................................................................................. G-1
APPENDIX I — INSTALLING AND TERMINATING CONTROL C ABLES ...................................... I-1
I.1 Scope .......................................................................................................................................... I-1
I.2 Installing Control Cables .............................................................................................................. I-1
I.3 Treatment of Cable End ................................................................................................................ I-1
APPENDIX O — GAUGE (SF6) PRESSURE VERSUS ALTITUDE .......................................... O-1
APPENDIX P — INTERNAL-EXTERNAL RETAINING RING (C-RING) ..................................... P-1
APPENDIX Q — MAIN ENCLOSURE HEATING SYSTEM ........................................................ Q-1
Q.1 Heating System ........................................................................................................................ Q-1
Q.2 Electrical Controls (Fig. Q.2-1) ............................................................................................... Q-2
Q.3 Replacement of Heater Elements ............................................................................................. Q-2
APPENDIX T — BREAKER OPERATION TESTING .................................................................... T-1
APPENDIX W — COMPOSITE INSULATORS .............................................................................. W-1
APPENDIX Y — REPLACING RUPTURE DISK .......................................................................... Y-1
Mitsubishi Electric Power Products, Inc.
PEB0084 Rev. D 03/06
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100/120SFMT32LE/32HLE Circuit Breaker
MATERIAL S AFETY DATA SHEET ............................................................................................. DS-1
PARTS L IST — PEB0067 ..................................................................................................... PL-1
6
PEB0084 Rev. D 03/06
1. Introduction
SECTION 1 — INTRODUCTION
1.1 General
The circuit breaker is one of the most important units in the electrical power system. The protection, stability and continuity of the system depends on the circuit breaker’s ability to switch line,
load and exciting currents and to interrupt fault currents. The SF6 gas circuit breaker assures the
high level of performance required for the reliable operation of the electrical system by making full
use of the exceptionally good electrical insulating characteristics and excellent arc quenching
properties of sulfur hexafluoride (SF6) gas.
The reliability of the system is further increased by the use of a SF6 gas insulating system and a
single pressure double flow SF6 gas puffer interrupter which reduces the number of moving parts
and auxiliary systems in the circuit breaker. The pressure required to blast the SF6 gas against the
arc and interrupt the current is generated by the compression of the gas between the moving
cylinder and the stationary piston of the interrupter during the opening operation. This simple
principle is shown in Figure 1.1-1.
When communicating with MEPPI regarding the product covered by this instruction book, include
all data contained on the nameplate attached to the equipment. Also, to facilitate replies when
particular information is desired, be sure to state fully and clearly the problem and attendant
conditions. For a permanent record, it is suggested that all nameplate data be duplicated and
retained in a convenient location.
Fig. 1.1-1 Principle of Interrupting Unit
Mitsubishi Electric Power Products, Inc.
PEB0084 Rev. D 03/06
1-1
100/120SFMT32LE/32HLE Circuit Breaker
1.2 Caution
IMPORTANT
Proper installation and maintenance are necessary to insure continued satisfactory operation. Circuit breakers are designed, developed and tested to perform the function of
circuit protection by interrupting currents up to and including the nameplate rating.
Therefore, circuit breakers are by design a maximum rated device. As a responsible
manufacturer, Mitsubishi Electric Power Products, Inc. can not recommend nor assume
any liability for any breaker applied above the nameplate rating. The consequences of
operating a breaker above the rating can lead to a catastrophic failure. This could result
in property damage and/or personal injury. Application of the breakers above the rating
in so called “emergency conditions” involves extreme risks and should only be considered
when the consequences of a catastrophic failure are acceptable.
MEPPI breakers have been designed and tested to meet the special and rigorous requirements of circuit breaker application. The reliability and safety in operation expected by
the electric utility industry requires that circuit breaker parts and components be manufactured with high standards of dimensional and material control. Only renewal parts
manufactured or authorized by MEPPI can provide assurance of reliable operation and
avoid the risk of improper operation which could result in outages, damage, and/or injury.
Use of unauthorized parts or components will void the warranty and other contractual
responsibilities.
1.3 Scope
This Instruction Book applies to the Mitsubishi Electric Power Products Type SFMT circuit
breaker. The Type SFMT is a dead tank, single pressure, SF6 gas filled, puffer type circuit
breaker. The information provided in the book includes general description, installation procedures, and operation/maintenance instructions.
The purchaser’s outline drawing, control schematic, wiring diagram, and SF6 gas schematics
should be referred to for specific information for a particular breaker. The instructions in this book
apply to circuit breakers with the following ratings:
Table 1.3 Rating
Type
100SFMT32LE
100SFMT32HLE
120SFMT32LE
120SFMT32HLE
1-2
Rated
voltage
kV
121
121
145
145
Rated
Interrupting
current (kA)
31.5
31.5
31.5
31.5
Rated
Current
(A)
Impulse
S.S.
AC
1200/2000/3000
1200/2000/3000
1200/2000/3000
1200/2000/3000
550
550
650
650
-----
260
260
310
310
Withstand Voltage (kV)
PEB0084 Rev. D 03/06
2. Receiving, Handling, Storing
SECTION 2 — RECEIVING, HANDLING, STORING
2.1 Receiving
The breaker is shipped completely assembled except for the subframe and pressurized with SF6
gas up to 0.34 kg/cm² (5 psig). The subframe is shipped separately and is added at the site to
complete the assembly. Miscellaneous details such as tools and spare parts are packaged in
plastic bags or crated and are shipped with the breaker.
Note 1: The SF6 gas pressure varies with temperature.
Note 2: The pressure gauge is calibrated at the mid-range of the scale and may not be accurate at
the low end of the scale.
The material should be checked against the packing list and inspected for damage. File a claim
with the carrier and notify the MEPPI representative if there is any missing item, damage, or visible
signs of rough handling.
2.2 Handling and Unpacking
The weight of the breaker is marked on the breaker nameplate and the packing list to determine
the appropriate crane capacity. Use rope or nylon slings for lifting to prevent damage to the
bushings and to protect the paint. Do not remove any identification tags from the components until
the installation is complete.
2.3 Storage
If immediate installation is not scheduled after inspection and inventory, the equipment should be
stored in a protected area. The details, accessories and spare parts should be stored indoors in a
dry, clean place.
2.3.1 Short Term Storage (less than 3 months)
The breaker interrupter enclosure and bushing assemblies are sealed from the atmosphere, contains SF6 gas and absorbent to maintain a dry interior. If the seals are disturbed, the absorbent
must be replaced and the unit resealed. The mechanism housings should be protected by storing
desiccant material inside the housing, keeping the vents sealed, and the housing doors closed.
2.3.2 Long Term Storage
Indoor Storage - To maintain the breaker in “as new” condition, it is preferred to store the
breaker indoor in a clean, dry area.
Mitsubishi Electric Power Products, Inc.
PEB0084 Rev. D 03/06
2-1
100/120SFMT32LE/32HLE Circuit Breaker
Outdoor Storage - If indoor storage of the complete breaker is not possible, it may be stored
outdoor by taking the following actions:
1. Maintain a positive SF6 gas pressure up to 0.34kg/cm² (5 psig) in the enclosure and bushings.
2. Energize the space heaters to maintain a dry housing interior. Remove the covers and other
obstructions from the mechanism housing vents to permit air to circulate through the housing.
3. The assemblies stored outdoors should be at least six inches off the ground to prevent water
on the ground from entering the assemblies.
4. Crates and boxes containing detail items must be stored indoors.
2-2
PEB0084 Rev. D 03/06
3. Description
SECTION 3 — DESCRIPTION
3.1 Type SFMT Circuit Breaker
The type SFMT breaker is a “dead tank”, three phase, mechanically ganged, sulfur hexafluoride
(SF6) gas insulated circuit breaker. The three phases or pole units and the mechanism housing are
mounted on a common frame. The energized parts inside the pole units are insulated from the
grounded or “dead tank” by pressurized sulfur hexafluoride gas. Bushing type current transformers
are located external to the enclosures between the bushing assembly and the interrupter. The
spring operating mechanism, SF6 gas monitor and breaker controls are located in the mechanism
housing.
Fig. 3.1-1 Type SFMT Circuit Breaker
Mitsubishi Electric Power Products, Inc.
PEB0084 Rev. D 03/06
3-1
100/120SFMT32LE/32HLE Circuit Breaker
3.2 Sulfur Hexafluoride (SF6) Gas
3.2.1 Description
Sulfur hexafluoride (SF6) in its pure state is inert, nontoxic, odorless, nonflammable and colorless.
It has excellent arc quenching properties and exhibits exceptional thermal stability. SF6 has exceptionally good insulating properties and at atmospheric pressure has 2.5 times the dielectric strength
of air. SF6 gas at 3kg/cm2 (42 psig) has the same dielectric strength as transformer oil.
Sulfur hexafluoride remains a gas without liquefying down to -30°F at the gas pressure normally
used in the puffer type breaker. The density of SF6 is about five times that of air (molecular weight
equal to 146). Heat transfer by free convection is 1.6 times that of air at atmospheric pressure and
2.5 times the value of air at 30 psig.
Arcing, which will occur during the normal operation of the circuit breaker, does not materially
affect the insulating properties of the gas. The solid arc decomposition products, observed as a fine
gray powder, have equally good dielectric properties, however, the powder will absorb moisture
and become conducting if exposed to high humidity. Under normal conditions the arced byproducts are not sufficient to require any restriction in operation. However, if the compartment is
opened for any long period of time for maintenance, the powder should be removed with a vacuum
cleaner.
3.2.2 Precautions Handling Arced SF6
A chemical breakdown of sulfur hexafluoride (SF6) occurs when it is exposed to a very high
temperature or electrical arc as in the circuit breaker. The decomposition products, gas and fine
powder may be toxic, strong irritants and attack the respiratory system.
CAUTION: Arced SF6 gas is accompanied by a strong and irritating odor indicating toxic
decomposition products. The arc products may be injurious and exposure to them should
be avoided. The arc powders are reactive with moisture and if inhaled could cause
irritation in the nose, throat and lungs. Contact with body perspiration could cause skin
irritation.
A strong irritating odor is sufficient warning of the presence of the decomposition products. This
would normally be present only after several major fault interruptions or an unusual arcing condition within the gas enclosure. If this condition occurs, the area should be thoroughly ventilated. If
work is necessary within this environment prior to the area being adequately ventilated, a selfcontained breathing mask should be used.
Gas which has been subjected to heavy arcing and containing considerable decomposition products can be cleaned and reused. The gas should be circulated through molecular sieve filters to
remove the active products. Most gas service trailers are equipped with molecular sieve filters and
with provisions for circulating and cleaning the gas.
CAUTION: All freshly activated absorbents should be cooled to ambient temperature
before introducing SF6 to avoid exothermic reaction.
3-2
PEB0084 Rev. D 03/06
3. Description
Large accumulations of powder (solid decomposition products), resulting from abnormal arcing
conditions, can be neutralized by mixing the powder in a bucket containing a solution of water and
bicarbonate of soda and safely disposed.
3.2.3 Handling of Sulfur Hexafluoride
CAUTION: Pure SF6 gas without oxygen (20%) will not support life. Do not enter any
tank previously containing SF6 without thorough ventilation. SF6 gas is heavier than air
and will accumulate in or be trapped in low “pockets.” Precautions should be observed in
nearby “trenches” and “depressions” where the SF6 gas can accumulate for short periods
of time before dispersing into the atmosphere.
Sulfur hexafluoride is furnished in standard industrial type cylinders color which are usually coded
green at the top end and the balance silver for easy identification. The cylinders have special size
connections (.965" dia. 14 thds./inch Nat. Std. left hand) supplied as a safety aid. The adapter for
connection to the cylinder is a CGA #590 bullet shaped coupling nipple. The gas is stored in the
cylinders at its vaporization pressure which at 75°F is 325 psig.
CAUTION: Any connection made to the cylinders must be suitable for 600 psig. A
pressure regulator is required when connecting a cylinder to a gas compartment fitting.
The gas compartment may be filled with gas directly from the cylinders or from a gas service
trailer. When transferring the gas from the cylinders the process can be accelerated by keeping the
cylinders warm to increase the rate of vaporization of the liquid SF6 stored in the cylinders. This
can be done by setting the cylinder in a tank of warm water maintained at a maximum temperature
of 125°F.
DANGER: Do not allow the temperature of the SF6 cylinders either in processing as
above or in storage to exceed 125°F. Excessive temperature can result in overpressure
and potential explosion of the cylinder.
3.2.4 Greenhouse Gas
SF6 gas has been identified by the Intergovernmental Panel on Climate Change as a “greenhouse
gas” with the potential to contribute to global warming. Therefore, SF6 gas should not be deliberately released to the atmosphere. The gas handling and leak detection procedures described in this
instruction book should be carefully followed to limit the amount of SF6 gas released over the life
of the circuit breaker. Used SF6 gas, even after internal arcing, can be effectively filtered for
recycling. Mitsubishi Electric Power Products' circuit breakers are designed, manufactured, and
factory tested to be free of leaks. If leaks develop while in service, appropriate action to locate
and eliminate the leaks should be taken.
3.2.5 Material Safety Data Sheet
For additional information concerning the composition and characteristics of sulfur hexafluoride
gas, review the product safety sheet supplied by the manufacturer of the SF6 gas.
Mitsubishi Electric Power Products, Inc.
PEB0084 Rev. D 03/06
3-3
100/120SFMT32LE/32HLE Circuit Breaker
3.3 Pole Unit
Each pole unit consists of a SF6 gas filled enclosure (Main Enclosure) which contains the interrupter assembly supported by insulators at each end of the interrupter. Two porcelain bushing
assemblies extend from the top of the main enclosure. Conductors inside the bushings connect the
interrupter assembly inside the metal main enclosures to the overhead line. The SF6 gas in the pole
unit is common to the main enclosure and the porcelain bushings. An inspection cover is located at
the end of the main enclosure to inspect and maintain the interrupters. An absorbent assembly is
located on the inside of the inspection cover to maintain the dry atmosphere required inside the
SF6 gas equipment. The rupture disc (*) is provided only when specified.
The SF6 gas is sealed in the main enclosure by O-rings at each end of the enclosure, the slide seal
assembly through which the operating rod passes, and O-rings below the bushing assemblies.
Fig. 3.3-1 Single Break Pole Unit
3-4
PEB0084 Rev. D 03/06
3. Description
3.4 Interrupter
The interrupter assembly is supported concentrically in the main enclosure by supporting insulators
(Fig. 3.4-1). The interrupter’s puffer cylinder and moving main contacts are connected to the three
phase linkage and spring mechanism by an insulating rod.
Fig. 3.4-1 Pole Unit and Interrupter
3.4.1 Closed Condition
The current flows from the bushing conductor through plug-in contacts to the piston support,
transfers to the puffer cylinder and moving main contact, transfers again to the stationary main
contact and holder and continues through plug-in contacts to the opposite bushing conductor.
3.4.2 Opening Operation
The insulating rod and piston rod assembly pulls the moving main contact assembly, consisting of
the puffer cylinder, moving main contact, moving arc contact and nozzle, to the open position. The
current is transferred to the still engaged moving arcing contacts as the moving main contact separates from the stationary main contacts after traveling a short distance from the closed position. An
arc is generated across the arcing contacts inside the arc nozzle as the moving arc contact separates from the stationary arc contact.
The SF6 gas within the puffer cylinder is compressed and blasted into the arcing region inside the
nozzle as the moving main contact assembly travels to the open position. The gas flow is directed
along the arc by the nozzle and across the arc as it flows into and through the hollow moving arc
contact and piston rod.
3.4.3 Closing Operation
The insulating rod and piston rod, connected to the operating mechanism, pushes the moving main
contact assembly to the close position. The SF6 gas flows back into the puffer cylinder during the
closing operation in preparation for the next opening operation.
Mitsubishi Electric Power Products, Inc.
PEB0084 Rev. D 03/06
3-5
100/120SFMT32LE/32HLE Circuit Breaker
3.5 Mechanical Linkage
The operating rod of each interrupter passes through the slide seal assemblies at the end of the
main enclosures into the mechanism housing and connects to levers on the lever assembly’s shaft
which connects the three interrupters together The shaft is connected to the main lever on the
spring operating mechanism assembly.
Fig. 3.5-1 Mechanical Linkage
3-6
PEB0084 Rev. D 03/06
3. Description
3.6 Spring Operated Mechanism
The type BM-2 spring operated mechanism (Fig. 3.6-1) uses energy stored in a trip spring to open
the circuit breaker. A closing spring is also used to close the breaker and to recharge the trip
spring. A universal motor recharges the closing spring at the end of each closing operation.
3.6.1 Closed Position, View A
The interrupter, connecting linkage, and the mechanism’s main lever are biased towards the open
position by the force of the charged trip spring. The trip holding latch, held in place by the trip
trigger, latches the interrupter in the closed position.
3.6.2 Opening Operation, View A and B
A trip signal energizes the trip coil is and causes the trip coil plunger to strike the trip trigger. The
trip trigger rotates clockwise and releases the trip holding latch. The trip holding latch disengages
from the pin “A” and releases the main lever. The interrupter opens as the main lever rotates
counterclockwise from the force of the discharging trip spring. The shock absorber dampens the
mechanical shock at the end of the opening operation.
3.6.3 Closing Operation, View C
The large gear and cam are connected to the cam shaft. The cam shaft is connected to the closing
spring through the closing lever and link. A clockwise torque from the charged closing spring is
applied to the cam shaft through the closing lever and link. The clockwise torque is blocked by the
closing holding latch engaging the pin “B” on the cam. The closing holding latch is held in place by
the closing trigger.
A closing signal energizes the closing coil and causes the trigger lever to strike the closing trigger.
The closing trigger rotates clockwise and releases the closing holding latch. The closing holding
latch rotates counterclockwise and disengages from the pin “B.”
The interrupter closes as the large gear and cam rotate clockwise from the force of the discharging closing spring through the closing lever and link. The shock absorber dampens the mechanical
shock at the end of the closing operation.
The cam, connected to the cam shaft, pushes on the roller of the main lever as the large gear and
cam rotate clockwise during the closing operation. The cam rotation causes the main lever to rotate
clockwise and charge the trip spring. The pin “A” on the main lever engages the trip holding latch
as the interrupter reaches the closed position.
The torque of the recharged trip spring is blocked and the interrupter is latched closed as the trip
trigger holds the trip holding latch in the engaged position.
Mitsubishi Electric Power Products, Inc.
PEB0084 Rev. D 03/06
3-7
100/120SFMT32LE/32HLE Circuit Breaker
Fig. 3.6-1 Operation of Type BM-1 Spring Operating Mechanism
3-8
PEB0084 Rev. D 03/06
3. Description
3.6.4 Charging of the Closing Spring
At the end of the closing operation a limit switch (not shown) starts the universal motor (not
shown) to recharge the closing spring. The small gear, connected by other gears (not shown) to the
closing spring charging motor, rotates counterclockwise. The large gear and cam on the cam shaft
rotates clockwise and recharges the closing spring through the closing lever and link. The torque
of the recharged closing spring drives the large gear and cam with the pin “B” clockwise to the
latching position when the closing link pin passes the “dead point” line. The charging motor is
switched off by the limit switch and the clockwise torque of the large gear and cam is blocked by
the closing holding latch engaging pin “B.”
3.6.5 Shock Absorber
A shock absorber is located at the top of the mechanism. The shock absorber decelerates the
interrupter and mechanism when the main lever reach the end of the opening stroke. The shock
absorber decelerates the mechanism gradually during the opening stroke to prevent the roller on
the mechanism main lever from colliding with the cam. The shock absorber, during the closing
operation permits the mechanism to “overtravel” past the latching point so the trip holding latch can
drop into place and latch its respective pin.
3.6.6 Safety Pins
Safety pins are provided to lock the mechanism in the open or close position during maintenance of
the circuit breaker. The safety pins prevent the trip and closing triggers from releasing the trip and
closing holding latches.
3.6.7 Accessories
Other accessories connected to and operated by the mechanism are auxiliary switches, mechanical
operation counter, and position indicator.
Mitsubishi Electric Power Products, Inc.
PEB0084 Rev. D 03/06
3-9
100/120SFMT32LE/32HLE Circuit Breaker
3.7 Mechanism Housing
The typical mechanism housing (Fig. 3.7-1) contains the mechanism with its accessories such as
the auxiliary switches, operation counter and position indicator. The housing also contains the
controls to operate the breaker, the SF6 gas monitoring unit which is connected to the SF6 gas
filled enclosures by copper piping, and terminal blocks for the connections to the station power
sources.
Fig. 3.7-1 Operating Mechanism Housing
3-10
PEB0084 Rev. D 03/06
3. Description
3.8 Electrical Control and Auxiliary System
3.8.1 Trip Circuit
The tripping signal is initiated by the local control switch or by the remote protective relays and
energizes the trip coil through a pair of auxiliary switch “a” contacts. The auxiliary switch “a”
contacts open to de-energize the trip coil as the interrupter and mechanism travel to the open
position.
3.8.2 Close Circuit
A closing signal, initiated by the local control switch or remote relays, energizes the closing coil
through a pair of auxiliary switch “b” contacts. The auxiliary switch “b” contacts open and deenergizes the close coil as the mechanism travels to the close position.
11-52C
FU1
8C
11-52T
8M
FUM
(+)
42M
52Y
52a
63GX
33HB
48T
49M
49MX
42M
63G/1
42M
42M
52Y
49M
49MX
49MX
52Y
DC
R
Y
63GX
49MX
52b
AC
R
M
X
R
G
63GX
OR
88M
DC
52b
49M
52Y
52C
52T
49MX
42M
63GX
48T
42M
(-)
8SH
FUSH
AC
ITEM
SH
63G/3
49MX
DESCRIPTION
52b
52a
ITEM
DESCRIPTION
CLOSING COIL
8C
KNIFE SWITCH
52T
TRIP COIL
8M
KNIFE SWITCH
63G/3
LOW PRESS. ALARM SWITCH
8SH
KNIFE SWITCH
63G/1
LOW PRESS. CUTOUT SWITCH
33HB
CLOSING SPRING LIMIT SWITCH
63GX
AUXILIARY RELAY
88M
SPRING CHARGING MOTOR
11-52C
CONTROL SWITCH-CLOSING
42M
MOTOR CONTACTOR
11-52T
CONTROL SWITCH-TRIPPING
49M
MOTOR THERMAL OVERLOAD
RY
RESISTOR
49MX
AUXILIARY RELAY
RG
RESISTOR
48T
TIME LIMIT RELAY
RMX
RESISTOR
FU1
FUSE
CIRCUIT BREAKER - OPEN
52a
AUXILIARY SWITCH a CONTACT
FUM
FUSE
KNIFE SWITCHES - OPEN
52b
AUXILIARY SWITCH b CONTACT
FUSH
FUSE
PRESSURE SWITCHES - LOW PRESSURE
SH
SPACE HEATER
RELAYS - DE-ENERGIZED
52Y
ANTI-PUMP RELAY
CLOSING SPRING - DISCHARGED
52C
Fig. 3.8-1 Typical Electrical Schematic
An auxiliary switch “a” contact in the anti-pumping relay circuit closes as the mechanism approaches the close position and energizes the anti-pumping relay. An anti-pumping relay contact in
the close coil circuit opens and remains open as long as the closing circuit remains energized,
preventing the circuit breaker from reclosing in the event the breaker should trip open. A second
anti-pumping relay contact in the anti-pumping relay circuit closes and seals in the anti-pumping
relay until the original close signal is removed from the circuit.
Mitsubishi Electric Power Products, Inc.
PEB0084 Rev. D 03/06
3-11
100/120SFMT32LE/32HLE Circuit Breaker
3.8.3 Gas Lockout Circuit
An SF6 gas pressure switch contact is provided to prevent the tripping and closing of the circuit
breaker if the SF6 gas pressure in the main enclosures falls below the safe operating level. The low
pressure lockout circuit can be arranged to trip and prevent the closing of the breaker. A low
pressure SF6 gas alarm is also available to provide a warning signal before the pressure reaches
the lockout level.
3.8.4 Charging of Closing Spring
At the end of the closing operation a limit switch closes and energizes the motor’s magnetic
contactor, the motor starts and recharges the close spring. The limit switch contact opens when
the close spring is recharged, stopping the motor. The motor has a thermal overload protection
and a time limit relay which will open the motor circuit in the event of a malfunction.
3.8.5 Housing Heaters
Space heaters are provided in the mechanism housing. The heaters provide sufficient heat to
reduce condensation in the housing.
3-12
PEB0084 Rev. D 03/06
3. Description
3.9 SF6 Gas System
The gas in the pole units are common to both the enclosures and the bushing assemblies. The three
pole units are connected together by stainless steel piping forming one gas system. The valve on
the end of the filling pipe inside the mechanism housing provides access to the system for the
evacuation of air and filling with SF6 gas. The gas service valve is sealed with an O-ring and cap
during normal operating conditions. The gas system is monitored by a density switch and pressure
gauge. A sampling valve and an isolation valve between the gas monitor and pole unit are used to
check the calibration of the density switch and pressure gauge.
CAUTION: The sampling valve and the service valve must be closed and capped and the
shut-off valve must be open when the breaker is in service.
Fig. 3.9-1 SF 6 Gas System
3.9.1 SF6 Gas Density
The SF6 gas system is a sealed, fixed volume, filled with a specific quantity of gas. This results in
the gas system pressure, at a constant density, changing with temperature variations. The correct
pressure for a specified density at a specific temperature can be obtained by referring to the graph
in Fig. 3.9-2.
Mitsubishi Electric Power Products, Inc.
PEB0084 Rev. D 03/06
3-13
100/120SFMT32LE/32HLE Circuit Breaker
Fig. 3.9-2 SF6 Gas Pressure Versus Temperature
3.9.2 Gas Density Switch
A switch is provided to monitor the density of the gas system. The switch compensates for changes
in the pressure due to temperature changes and responds only to changes (gas leaks) in the density of
the gas system. The switch (Fig. 3.9-3) employes a bellows which expands and contracts as the gas
pressure increases and decreases. Bi-metal discs in the switch mechanism compensates for any
movement of the bellows due to changes in the temperature surrounding the switch. The switch is also
further compensated for the expansion and contraction of the switch parts due to temperature by a bimetal hinge.
Electrical pressure switch contacts are provided to prevent the tripping and closing of the circuit
breaker if the SF6 gas pressure in the enclosures falls below the safe operating level (20% of normal
pressure). The lockout circuit can be arranged to trip and prevent the closing of the breaker. A low
pressure alarm is also available to provide a warning signal (10% of normal pressure) before the
pressure reaches the lockout level. The contacts operate according to Table 3.9-1.
Table 3.9-1 Pressure Switch Settings
Switch
Alarm
@20ºC (68ºF)
Lockout @20ºC (68ºF)
Operation
2
Kg/cm -g
3.8†.3
3.3†.3
psig
Reset
kPag
54†4 370†30
47†4 320†30
2
Kg/cm -g
psig
kPag
4.0-4.3
3.5-3.8
56-61
49-54
390-420
340-370
CAUTION: Do not operate the circuit breaker below the SF6 gas lockout level except
with the manual jack assembly as serious damage to the circuit breaker will occur.
3-14
PEB0084 Rev. D 03/06
3. Description
Fig. 3.9-3 SF6 Gas Density Switch
3.9.3 SF6 Gas Pressure Gauge
A compound pressure gauge is provided for local visual indication of the SF6 gas pressure. The
compound gauge will not be damaged when the gas system is under vacuum. The dual dial is
scaled in pounds per square inch (psig) and kilo pascals (kPa) . The pressure range is from 0 to
160 psig (0-1100 kPag). The vacuum range is from 0 to -30 in. Hg (0 to -100 kPag).
Note: The SF6 gas pressure will vary with changes in temperature. The SF6 gas pressure gauge is
not temperature compensated. It is necessary to know the ambient temperature to determine if the SF6 gas is at the proper pressure. The normal SF6 gas pressure at different
ambient temperatures is shown in the SF6 gas pressure versus temperature graph.
Note: Pressure gauges are affected by altitude. See Appendix O.
Mitsubishi Electric Power Products, Inc.
PEB0084 Rev. D 03/06
3-15
100/120SFMT32LE/32HLE Circuit Breaker
3.9.4 SF6 Gas Seals
The gas seals of the bolted joints are made by an O-ring set in a groove of one of the two mating surface.
The O-ring groove and the mating surface must have a smooth surface, no scratches or defects, and
be clean to maintain a good gas seal.
The surface between the O-ring groove and the outside edge of the flange is covered with a gas sealant
to protect the surfaces and seal from corrosion.
Fig. 3.9-4 Gas Seal Construction
3.9.5 Absorbent
An assembly to store absorbent is located in each SF6 gas enclosure. The amount of absorbent,
approximately 10% of the weight of the SF6 gas, is sufficient to keep the SF6 gas dry during the life of
the breaker provided it is not opened. The absorbent also acts to remove arc products.
The absorbent should be changed whenever the SF6 gas enclosure is opened. New absorbent should
be added after the maintenance is complete and before the enclosure is closed.
3.9.6 Gas Adapter
The service port to the main enclosure for evacuation and filling is terminated with a capped Dilo DN8
service valve. An adapter with a male 9/16-18, 37° SAE thread to a Dilo DN8 fitting (Fig. 3.9-1) is
provided to connect the gas filling hose to the circuit breaker . After the SF6 gas is added to the breaker,
the adapter should be removed and the service valve recapped.
3-16
PEB0084 Rev. D 03/06
3. Description
3.10 Bushing Assembly
The SF6 gas filled bushing assemblies at each end of the main enclosure provide the electrical
entrance to the inside of the grounded main enclosure. The bushing assembly consists of a hollow
porcelain tube with flanges cemented on both ends, a conductor assembly, and a top porcelain and
bottom porcelain O-ring. A NEMA four hole terminal pad is provided at the top of the bushing
assembly to connect the overhead line to the breaker. A silver plated contact at the bottom end of
the bushing conductor plugs into a socket on the interrupter assembly.
Composite insulators are available as an option on Mitsubishi Electric Power Products, Inc. circuit
breakers. Refer to Appendix W for special handling instructions.
Fig. 3.10-1 Bushing Assembly (4000)
Mitsubishi Electric Power Products, Inc.
PEB0084 Rev.D 03/06
3-17
100/120SFMT32LE/32HLE Circuit Breaker
3.11 Current Transformer Assembly
The bushing type current transformer (BCT) assembly consists of the current transformers, spacers, fittings, adapter flange, cover and gasket. The BCT cover is bolted at the top to the adapter
flange below the bushing assembly and weather proofed with sealant. A gasket is mounted between the BCT cover and the bottom support plate on the main enclosure to prevent induced
currents from circulating from the enclosure to the BCT cover, to the bottom plate and back to the
main enclosure.
The current transformers are protected from the environment and require no maintenance.
CAUTION: The secondary circuits of the current transformers should be either connected
to a load or short circuited. The primary current will induce a very high voltage in the
secondary leads if the secondaries are open circuited. This high voltage may damage the
secondary circuit insulation and can thermally damage the iron core.
Fig. 3.11-1 Current Transformer Assembly
3-18
PEB0084 Rev. D 03/06
4. Circuit Breaker Operation
SECTION 4 — CIRCUIT BREAKER OPERATION
4.1 Electrical Operation
Electrical closing and opening operations can be made from the central station control panel or at
the local control panel in the circuit breaker. An SF6 gas pressure switch contact will prevent the
closing, and will either block or trip the breaker if the gas system pressure falls below the lockout
pressure. The control schematic received with the breaker should be reviewed to determine what
controls were ordered. The following items should be checked before electrically operating the
breaker.
CAUTION: Failure to follow the circuit breaker operating, installation, and maintenance
instructions can result in property damage, unscheduled outages, and/or loss of life.
• Operation is in accordance with the Power Company’s procedure.
• SF 6 gas system is at normal operating pressure. Gas system valves are in proper position.
Pressure @ 20ºC
Normal
Alarm
Lockout
kg/cm²
5.0 to 5.2
3.8 ± .3
3.3 ± .3
psig
71 to 74
54± 4
47 ± 4
kPag
500 to 520
370 ± 30
320 ± 30
• Manual jack has been removed from the mechanism and the trip and close safety prevention pins are
removed.
• DC controls and AC auxiliary voltages are normal and all control switches are closed.
4.2 Emergency Operation
The circuit breaker can be opened or closed without electric power by pushing on the trip or close
coils’ armature inside the mechanism housing if the trip or close springs are charged.
CAUTION: The SF6 lockout switch is by-passed during the emergency operation. Check
the SF6 gauge for sufficient pressure before making an emergency operation. Do not
operate the breaker if the SF6 gas pressure is below the lockout pressure.
Keep hands, body, and clothing away from mechanism when performing emergency
operations. Force of mechanism can cause injury to personnel.
WARNING: Do not push on the closing coil armature when the breaker is in the closed
position and the closing spring is charged.
Mitsubishi Electric Power Products, Inc.
PEB0084 Rev. D 03/06
4-1
100/120SFMT32LE/32HLE Circuit Breaker
This page left blank intentionally
4-2
PEB0084 Rev. D 03/06
5. Inspection and Maintenance
SECTION 5 — INSPECTION AND MAINTENANCE
5.1 Inspection Program
A proper program of inspection and maintenance will assure reliability of the equipment. Maintain
a permanent record for each circuit breaker. The inspection requirements vary depending on the
length of time in service, severity and frequency of operation. A recommended inspection and
maintenance program has been divided into three categories identified as follows:
Table 5.1 Inspection Based on Service Time
Inspection
Frequency
Patrol - P
*
Description
External visual inspection of energized breaker
Routine - R6
Every 6 years
Special - S
Operations per External and internal inspection. Breaker deTable 5.2
energized and degassed. Replacement of contacts
or mechanism parts, lubrication. Operation timing
tests.
External inspection with breaker de-energized. Minor
adjustments and lubrication. Operation timing tests.
* Inspect weekly for first two weeks; bi-weekly for next four weeks. Follow company's
policy thereafter.
Table 5.2 Special Inspection (S) Based On Operations
Type
Replacement of
arc contacts
and Nozzle
Operating Condition
Inspection Period
Low current interruption
0 to 900 A
Current interruptions
Rated load current
4,000 operations
Short circuit interruptions/phase
Rated 31.5 kA
* or accumulated equivalent
Mitsubishi Electric Power Products, Inc.
PEB0084 Rev. D 03/06
2,000 operations
10 operations*
5-1
100/120SFMT32LE/32HLE Circuit Breaker
5.2 Maintenance Precautions
The electrical performance of the circuit breaker requires that the interior and insulating
parts be clean and dry. The interior of the breaker enclosures should not be exposed to
inclement weather conditions. Whenever the enclosures are open, temporary coverings
should be available to prevent exposure to dust, dirt and moisture. Following are some
detail precautions which should be observed.
1.
De-energize breaker and apply grounds to the breaker terminals.
2.
Open switches to breaker DC control and AC control circuits.
3.
Do not open enclosures in rain, very high humidity (>80%) or high winds (>10m/sec.
(20 mph)).
4.
Pure SF6 gas (less than 20% oxygen) will not support life. Arced SF6 gas may contain toxic products. Do not enter any enclosure which contained SF6 gas without
thorough ventilation. Refer to the section 3.2 on precautions with arced SF6 gas.
5.
Insert close and trip prevention pins except as required for inspection and tests.
6.
Do not operate the breaker when SF 6 pressure is below lockout except with the hand
jack.
7.
Do not disassemble slide seal assembly on operating rod.
8.
Cover enclosure openings with plastic sheeting or bags whenever active work is not
being performed inside the interrupter enclosure.
9.
Discard C-rings. Replace with new C-rings.
10. Replace absorbent whenever enclosures are opened. Replacement should be made
immediately before evacuation.
11. Thoroughly clean interior after inspection and maintenance.
12. Never use cloths or wipers used previously on metal parts to clean insulating parts.
13. Only use denatured alcohol to clean interior insulators.
14. Discard old O-rings. Replace with new O-rings,
15. Perform gas leakage test on any seals opened for maintenance.
5-2
PEB0084 Rev. D 03/06
5. Inspection and Maintenance
5.3 Inspection Check List
The inspection check list identifies the recommended action required for each type of inspection or
maintenance.
Table 5.3-1 Inspection Checklist
Frequency
P
R6 S
System
Inspection Item
Action Required
Structural
Porcelain contamination
Clean
X X
Porcelain cracks, chips
Replace
X X
Terminal corrosion
Clean with abrasive
and regrease
X X
Enclosures, housings, and
frame rust
Clean and touch
up with paint
X X
External hardware
tightness
Retorque all loose
hardware
X X
Ground terminals
Retorque hardware
X X
Gas pressure
Temperature
Record
Record
Check valves position
Service valve - closed
Isolation valve - open
Sampling valve - closed
Sampling port- capped
X
X
X
X
Pressure switch
Check pressure setting.
Replace if not within
specifications.
X X
Pressure gauge
Calibrate
X X
Gas leakage
Leak test disassembled
joints
Contacts
Measure resistance
X X
Measure contact wipe
at mechanism
X X
Gas system
Interrupter
X
X
X X
X X
X
X
X
X
X
Arc contacts
Inspect and measure for arc
erosion. Replace as required
X
Nozzle
Inspect for arc erosion.
Replace as required.
X
Absorbent
Replace
X
Mitsubishi Electric Power Products, Inc.
PEB0084 Rev. D 03/06
5-3
100/120SFMT32LE/32HLE Circuit Breaker
Table 5.3-1 Inspection Checklist (cont.)
Frequency
P
R6 S
System
Inspection Item
Action Required
Mechanism
Operations counter
Record
Travel
Measure
X X
Lubrication
Clean and relubricate
X X
Hardware and retaining
rings
Check for looseness
Retorque or replace
X X
Shock absorber
Check for oil leakage
X X
Close coil assembly
Check gap dimensions
Reset
X X
Trip coil assembly
Check gap dimensions
Reset
X X
Cam and roller gap
Check dimensions
Reset
X X
Hardware
Check for tightness
X X
Control wiring
Wire terminals secure
X X
Wire terminal screws
tight
X X
Insulation check with
500V megger
X X
CT secondary wiring
Insulation check with
500V megger
X
Weather seal
Door gasket condition
X X
Door gasket sealing
X X
Water leaks
X X
Shock mounting rubber
Replace if aged
X X
Heaters
Check functioning and
measure resistance
X X
Timing
Check closing and
opening times
X X
Control
Housing
Operation
Test
5-4
X
PEB0084 Rev. D 03/06
X X
5. Inspection and Maintenance
5.4 Tools and Material
Normally tools and material are not required for the patrolling inspection since the objective is to
maintain a “log” of the breaker’s condition and identify any abnormalities that may require maintenance. Tools and material required for the routine (6 yr, etc.) and Special (S) inspections should
be obtained before the inspection starts to avoid unnecessary outage of the breaker. The tools and
parts obtainable from the breaker supplier are identified by the part number in parenthesis.
5.4.1 Tools
Item
Inspection
Moving arc contact tool (7012)
Arc nozzle tool (7001)
Manual jack assembly (7030)
Torque wrench 2200 kg-cm (159 lb-ft)
Torque wrench 280 kg-cm (20.3 lb-ft)
Ratchet wrench and extension
Metric sockets (8, 10, 13, 17, 19, 24, 36 mm)
Metric allenhead socket 10mm
Metric open end wrenches
Evacuating and SF6 gas filling equipment
Milli-Ohm test equipment
Megger Test Set 500v & 1000v
Timing equipment
SF6 gas leak detection equipment
SF6 gas fill valve adapters (7024, 7025)
Pliers
Mechanic scale 10 to 12 inch
Feeler gauges
Plastic Scrapers
Scotchbrite
R6
R6
R6
R6
R6
R6
R6
R6
R6
R6
R6
R6
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
5.4.2 Material
Item
Inspection cover O-ring, V480 (1202)
Gas sealant (KE 45-RTV)
Absorbent, Zeolum F9 (1301)
Absorbent bag (1306)
Loctite, #242 blue (9903)
Contact grease (9904)
Stationary arc contact (2011)
Moving arc contact (2041)
Arcing nozzle (2040)
SF6 gas
Diamond #2 low temp grease (9906)
Methanol
Plastic sheets
Dow Corning #111 Lubricant
Loctite - Red
Mitsubishi Electric Power Products, Inc.
PEB0084 Rev. D 03/06
Quantity
Inspection
3
300 g
7 kg
15
R6
25cc
3
3
3
45 lbs
1
R6
R6
R6
R6
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
5-5
100/120SFMT32LE/32HLE Circuit Breaker
5.5 SF6 GAS SYSTEM
The SF6 gas requires no maintenance except for the recording of the SF6 gas pressure during
inspections to verify the system is not leaking SF6 gas. The SF6 gas density monitor reacts to both
temperature and gas pressure changes. The ambient temperature should also be measured and the
results compared with the SF6 gas pressure versus temperature graph to determine if there is a
leak.
5.5.1 Adding SF6 Gas
If the pressure has dropped below the normal gas pressure, it may be necessary to restore the
breaker to the correct pressure by adding gas. This can be done by following the procedure in
“Adding SF6 Gas,” in Appendix E.
Note: Add sufficient gas to reset pressure switch. Do not overpressurize the main enclosures.
5.5.2 SF6 Gas Removal and Filling
It is necessary to remove the SF6 gas before the main enclosure is opened to inspect and maintain
the interrupter contacts. A 9/16 inch 37º SAE to Dilo DN8 adapter is provided for evacuating and
filling the breaker. Ventilate the SF6 gas compartments with fresh air and remove the SF6 arced
products with a vacuum cleaner. Observe all of the precautions pertaining to SF6 gas and the arc
products.
Note: Connect the 9/16 inch SAE side of the adapter to the hose first, then connect the Dilo
fitting to the breaker service port. The DN8 service port opens as soon as the DN8
adapter is connected to the port, permitting passage of the SF6 gas.
5.5.3 Gas Leak Inspection
All gas seal joints that were disturbed when the breaker was opened for internal inspection should
be checked for leaks. This can be done by using leak detection fluid or an SF6 leak detector as
described in Appendix E.
5.5.4 Gas Pressure Switch Inspection
Valving is provided to isolate the pressure switch, pressure gauge and the instrument line with the
sampling valve from the breaker gas system so that instruments can be calibrated without lowering
or raising the gas pressure in the main enclosures. Inspection of the gas density switch operation
can be done as follows:
CAUTION: Breaker must be de-energized and the switch to the DC power source opened
when testing the switches by bleeding SF 6 gas from the sample valve.
The sampling valve and the service valve must be closed and the test valve must be open
before the breaker is put in service.
1. Close the test valve between the pressure switch and gauge, and the SF6 gas main enclosure.
2. Connect the electrical continuity instrument across the alarm and the lockout contact.
5-6
PEB0084 Rev. D 03/06
5. Inspection and Maintenance
3. Release the gas from the instrument line slowly through the sampling valve.
4. Record the pressure at which the alarm and cut-out switch contacts operate. The required
operating pressure will vary with the temperature. Measure the temperature and refer to the
graph for correct pressure. The permissible tolerance is + 30 kPag (0.3 kg/cm², 4 psig).
CAUTION: Close the sampling valve and open the test valve after the inspection is
complete.
The switch operation can be rechecked by closing the sampling valve and opening the test valve to
refill the instrument line and repeating the steps 1 to 4.
The pressure switch setting should not be changed. If the operation is incorrect or outside the
tolerances, replace the switch.
5.5.5 Gas Moisture Control
It is important to protect the main enclosures containing the interrupter from prolonged exposure to
excessive moisture during installation or maintenance. The main enclosure should not be left open
to the environment for any extended period of time and should be temporarily sealed during maintenance when work is not actually being done. If these precautions are observed, the interior and
SF6 gas will be dry and maintained dry by the absorbent material installed as described in the
Appendix D.
CAUTION: Check control schematic diagram for breaker operation at lockout pressure.
Breaker may trip open if SF6 gas pressure drops to lockout pressure while checking
moisture content.
The sampling valve and the service valve must be closed and the test valve must be open
before the breaker is put in service.
If there is any concern for excessive moisture in the gas, a sampling valve is provided for connection to owner’s moisture measuring instrument. The sampling valve is identified on the schematic of
the gas system and is located in the mechanism housing.
The maximum level of moisture in the SF6 gas should be limited to 300 ppm(v). If the initial test
for moisture exceeds the 300 ppm(v) level, the test should be repeated to assure there was no
errors in the testing procedure. If the high moisture level persists, corrective action should be taken
to reduce the moisture level to 100 ppm(v) or less. The corrective action would be to evacuate the
main enclosure, replace the absorbent and dry the SF6 gas when refilling the main enclosures or
use new dry gas.
5.5.6 Renewal of Absorbent
The absorbent is located on the inspection cover plates of the main enclosures. The absorbent
should be replaced whenever the main enclosure is opened to inspect the contacts. The procedure
for replacing the absorbent is described in Appendix D. The cover plate and the enclosure O-ring
seal surfaces should be cleaned and gas sealer applied as described in Appendix A.
Mitsubishi Electric Power Products, Inc.
PEB0084 Rev. D 03/06
5-7
100/120SFMT32LE/32HLE Circuit Breaker
5.6 Mechanism And Linkage Inspection
5.6.1 Manual Jack Assembly
A manual jack assembly is provided to manually open and close the breaker slowly without electrical power.
WARNING: Do not open or close the breaker with the manual hand jack assembly if the
breaker is energized. The hand jack assembly is a maintenance tool and must be used
only on a de-energized breaker isolated from the power system.
CAUTION: De-energize the circuit breaker and ground the high voltage terminals. Deenergize the AC and DC circuits by opening the control and auxiliary circuit switches.
Insert the trip and close prevention safety pins into the mechanism before the hand jack
is installed.
5.6.1.1 Assembling Hand Jack Assembly
Insert the pin into the main lever and secure it with the M16 nut. Apply grease to the jack bar threads and
bearing to reduce the friction while jacking. Thread the M24 nut onto the jack bar and position the bearing
on the nut.
Position one end of the jack bar against the pin in the main lever. Place the guide over the jack bar and nut
up to the bearing. Secure the guide to the mechanism frame with two M20x40 bolts.
A special socket, operated by a M30 socket and ratchet wrench, is provided to fit the jack bar nut. After
the hand jack is assembled to the mechanism, turn the jack nut counterclockwise to remove the play (slack)
in the hand jack assembly. Turning the wrench clockwise will open the breaker contacts. Turning the wrench
counterclockwise will close the breaker contact.
Fig. 5.6-1 Hand Jack Assembly (7002)
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PEB0084 Rev. D 03/06
5. Inspection and Maintenance
5.6.1.2 Manual Opening
Remove the trip prevention safety pin. Push on the trip coil assembly’s plunger and maintain the
force on the trip button while turning the ratchet clockwise until the trip trigger is disengaged from
the trip holding latch. Release the trip button and continue the opening operation until the ratchet
becomes loose.
CAUTION: Insert the close prevention safety pin before removing the hand jack
assembly after the breaker is jacked open.
5.6.1.3 Manual Closing
Rotate the hand jack ratchet counterclockwise until the tripping trigger engages the trip holding latch.
Reverse the rotation of the hand jack ratchet until the holding latch pin “A” is secured by the holding
latch. Continue rotating the ratchet clockwise to remove the hand jack assembly.
CAUTION: Insert the trip prevention pin before removing the hand jack assembly from the
mechanism when the breaker is in the closed position.
5.6.1.4 Manual Charging of the Closing Spring
The closing spring can be charged in the open breaker position without electric power by fitting a 17mm
hex socket, extension and ratchet wrench to the end of the ratchet shaft on the spring mechanism.
Rotate the ratchet shaft clockwise until the closing holding latch engages the close holding latch pin “B”.
Note: The ratchet wheel rotates in the charging direction only. The closing spring can not be discharged
by rotating the ratchet shaft in the opposite direction.
Fig. 5.6-2 Manual Charging of Closing Spring
Mitsubishi Electric Power Products, Inc.
PEB0084 Rev. D 03/06
5-9
100/120SFMT32LE/32HLE Circuit Breaker
5.6.2 Mechanism Lubrication
Lubrication of the mechanism is required during the routine and special inspections. Diamond low
temperature #2 grease, available from Mitsubishi Electric Power Products, is the only authorized
grease for this application.
CAUTION: Insert the closing and trip prevention safety pins into the mechanism or mount
the manual jack assembly before greasing the spring guide.
Remove as much of the existing grease as possible from the parts before applying the fresh grease.
The following items marked with an single asterik (*) are lubricated every six (6) years.
1. Bevel gears of motor drive.
2. Inner surface of close spring guide. The closing spring must be in the charged position to grease
the required area, Fig. 5.6-3. Insert the closing prevention pin or attach the manual jack to the
mechanism to prevent the spring from discharging. Apply the grease to the complete circumference
of the inner surface from the spring to the short edge
C-rings (snap-ring) on the shafts and pins which are removed during lubrication should be replaced with
new C-rings using a 51-1A snap ring pliers.
Fig. 5.6-3 Cross-section View - Type BM-1.1 Spring Operating Mechanism
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PEB0084 Rev. D 03/06
5. Inspection and Maintenance
5.6.3 Mechanism Adjustments
The mechanism travel, cam clearance and settings of the trip and closing coil assemblies should be
inspected and adjusted if necessary during the routine and special maintenances. Refer to Table
5.6 for the proper dimensions.
5.6.3.1 Mechanism Travel
The mechanism travel “SM” is measured from a fixed point on the turnbuckle to the bottom of the
mechanism frame.
CAUTION: Insert the closing prevention safety pin into the mechanism before inspection or
maintenance if the close spring is charged.
1. Measure and record “SM-1” with the breaker in the open position and the closing spring
charged.
2. Manually jack the mechanism to the closed position with the hand jack assembly.
CAUTION: Insert the trip prevention safety pin before the measurement of SM-2.
3. Measure and record “SM-2” with the breaker in the close position.
4. The mechanism travel “SM” is given by following formula.
“SM” = “SM-1” - “SM-2”SI-2.
Fig. 5.6-4 Travel Mechanism
Mitsubishi Electric Power Products, Inc.
PEB0084 Rev. D 03/06
5-11
100/120SFMT32LE/32HLE Circuit Breaker
5.6.3.2 Cam Clearance
With the mechanism in the open position and the closing spring charged, measure the gap “G”
between the cam and the main lever roller. Adjustment of the gap “G” is made by changing the
position (up or down) of the shock absorber’s support plate.
CAUTION: Insert the close prevention pin before the inspection or adjustment of Gap “G”.
Fig. 5.6-5 Cam Clearance
5.6.4 Trip Coil Assembly
CAUTION: Insert the trip prevention pin before inspection or adjustment of the trip coil
assembly.
The stroke “S.T.” of the moving core on the trip coil assembly is determined by measuring the gap
between the moving core and stationary core. The stroke “S.T.” is adjusted by loosening the two M6
nuts and turning the two M6 bolts.
Measure the gap “G.T.” between the trip assembly plunger and the trip trigger with a feeler gauge. The
gap “G.T” is adjusted by loosening the M10 nut on the plunger and rotating the plunger to the correct
dimension.
After adjustments, the nuts should be relocked.
Fig. 5.6-6 Trip Coil Assembly Settings
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PEB0084 Rev. D 03/06
5. Inspection and Maintenance
5.6.5 Closing Coil Assembly
CAUTION: Insert the close preventive pin before the inspection or adjustment of the
close coil assembly.
The stroke “S.C.” of the moving core on the closing coil assembly is determined by measuring the gap
between the moving core and stationary core. The stroke “S.C.” is adjusted by loosening the two M6
nuts and turning the two M6 bolts.
Measure the gap “G.C1” between the closing coil trigger lever and the closing trigger with a feeler
gauge. The gap “G.C1” is adjusted by loosening the M10 nut on the plunger and rotating the plunger.
Loosen the closing coil mounting bolts to correct.
After adjustments, the nuts should be relocked.
Fig. 5.6-7 Closing Coil Settings
Mitsubishi Electric Power Products, Inc.
PEB0084 Rev. D 03/06
5-13
100/120SFMT32LE/32HLE Circuit Breaker
Table 5.6 Mechanism Dimensions
Item
Mark
Mechanism Stroke
“SM”
Gap between roller and cam
“G”
Stroke of trip coil’s moving
core
“S.T.”
Gap between trip coil plunger
and trip trigger
“G.T.”
Difference between stroke
(S.T.) and gap (GT)
“S.T.” – “G.T.”
Stroke of closing coil’s moving
core
“S.C.”
Gap between closing coil
plunger and closing trigger
“G.C1”
Difference between (S.C.) and
gap (G.C.)
“S.C.”– “G.C1”
Dimension
100 + 1/-3mm
3.937 + 0.039 / -0.118 in.
1.4 † 0.3 mm
0.055 † 0.012 in.
2.8 – 3.2 mm
0.110 – 0.126 in.
0.8 – 1.2 mm
0.031 – 0.047 in.
1.6 – 2.4 mm
0.063 – 0.094 in.
5.0 – 5.5 mm
0.197 – 0.217 in.
2.0 – 2.5 mm
0.079 – 0.098 in.
3.0 – 3.5 mm
0.118 – 0.138 in.
Fig. No.
Fig. 5.6-4
Fig. 5.6-5
Fig. 5.6-6
Fig. 5.6-6
Fig. 5.6-7
Fig. 5.6-7
5.7 Interrupter
The need for an internal inspection of the interrupter contacts is determined by the number of
interruptions specified in Special Inspection, Table 5.2, or by external measurements such as
contact resistance or contact stroke which may identify an abnormal internal condition.
5.7.1 External Interrupter Inspection
Measure the resistance of the main current path when the breaker is in the close position with a
100 amp micro-ohm meter connected to the high voltage bushing terminals.
Measure the interrupter contact stroke and contact wipe by attaching an electrical continuity test
instrument to the bushing terminals. These measurements can be made while making the mechanism
stroke measurements described in the mechanism section.
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PEB0084 Rev. D 03/06
5. Inspection and Maintenance
Fig. 5.7-1 Interrupter Stroke and Contact Wipe
A1 - With the interrupter in the open and latched position, measure the distance from the face of
the slide seal assembly to the end of the operating rod.
A2 - Manually jack the interrupter towards the close position. Stop jacking as soon as the continuity instrument indicates the interrupter arcing contacts are touching. Measure the distance
from the face of the slide seal assembly to the end of the operating rod.
A3 - Manually jack the breaker to the fully closed position. Measure the distance from the face of
the slide seal assembly to the end of the operating rod.
Interrupter Stroke = A1 minus A3 = 150 + 2/-5 mm (5.91 + .078. -0.197 in.)
Contact Wipe
= A2 minus A3 = 27 † 2 mm (1.06 † 0.078 in.)
If the interrupter stroke or contact wipe are not within the above dimensions, it may be an indication that the contacts are worn and may need to be replaced.
5.7.2 Internal Contact Inspection
The inspection and/or replacing of the arcing contacts and nozzle is done through the inspection
cover at the rear of the enclosure. The inspection of the contacts is made with the interrupter in the
open position after the breaker has been de-energized, the disconnect switches opened and the
high voltage terminals grounded.
With the circuit breaker in the open position, open the DC control and the AC auxiliary power
switches. Install the trip and close prevention safety pins into the mechanism. Remove the SF6 gas
from the enclosure.
Mitsubishi Electric Power Products, Inc.
PEB0084 Rev. D 03/06
5-15
100/120SFMT32LE/32HLE Circuit Breaker
Fig. 5.7-2 Replacing Arc Contacts and Nozzle
5-16
PEB0084 Rev. D 03/06
5. Inspection and Maintenance
CAUTION: An enclosure with a high concentration of SF6 can be hazardous causing
asphyxiation from lack of oxygen. Before entering enclosure, ventilate well and clean
interior of powders. A continuous flow of dry, fresh air would improve personnel
conditions and help to keep the atmosphere air from entering the enclosure. Refer to the
section on SF 6 gas for precautions in SF6 environment.
Open the enclosure cover and ventilate the enclosure with air to eliminate any residual SF6 gas.
Remove any gray powder from the area with a vacuum cleaner. Remove the stationary arc contact
and arc contact holder (Fig. 5.7-2b) from the stationary contact assembly by removing the two
M10 socket head bolts with a 8 mm allenhead socket, extension and ratchet wrench. Examine the
arc contact for erosion. The service length (Fig. 5.7-3) of the contact is 210 to 220 mm (8.26" to
8.66").
Fig. 5.7-3 Stationary Arc Contact Service Limit
Note: Further disassembly is not required and the stationary arc contact can be reassembled to the
interrupter if the contact erosion is not excessive.
If the erosion is minor with small abrasions, remove the abrasions and polish the arc contact with
fine sandpaper. Apply a very light film of contact grease to the surface of the contact. Reassemble the arc contact and contact holder to the stationary contact assembly, torquing the M10
socket head bolts to 280 kg-cm (20.3 lb-ft).
5.7.3 Removing Arc Contacts and Nozzle
If the arc erosion has reduced the length of the stationary arc contact to less than 210 mm (8.26"),
then the stationary arc contact, teflon nozzle and the moving arc contact should be replaced with
new components.
Insert the special nozzle tool (Fig. 5.7-2c) into the teflon nozzle and turn counterclockwise to
remove the nozzle. Insert the moving arc contact tool (Fig. 5.7-2d) into the moving arc contact
and turn counterclockwise to remove the moving arc contact.
Mitsubishi Electric Power Products, Inc.
PEB0084 Rev. D 03/06
5-17
100/120SFMT32LE/32HLE Circuit Breaker
5.7.4 Reassembling Arc Contacts and Nozzle
Thoroughly clean the interior of the enclosure and the insulating components. Use lint-free cloth
and denatured alcohol to clean the insulating parts. Remove the dirt and powders with a vacuum
cleaner. Clean the surfaces of the moving arc contact. Apply a very light film of contact grease to
the threads and the inside contact surface of the moving contacts. Assemble the moving arc
contact with the moving arc contact tool and torque the contact to 2200 kg-cm (159 lb-ft).
Clean the new teflon nozzle with denatured alcohol and a lint-free cloth and install the nozzle with
its special tool (Fig. 5.7-2c). The nozzle is locked in place by an interference fit. The resistance to
threading the nozzle increases after 3 or 4 turns and then decreases as the nozzle is screwed into
position. When the resistance reduces, remove the handle from the nozzle tool and turn the tool by
hand until the nozzle “bottoms” into place.
Fig. 5.7-4 Application of Contact Grease
Apply a very thin coat of contact grease to the tips of the main contact fingers (Fig. 5.7-4). Also
apply a very light film of contact grease to the tip and the surface of the stationary arc contact.
Apply a very thin film of grease to the surface of the stationary contact holder where it makes with
the main stationary contact. Connect the holder to the main stationary contact and torque the bolts
to 280 kg-cm (20.3 lb-ft).
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PEB0084 Rev. D 03/06
5. Inspection and Maintenance
Replace the absorbent in the case (Fig. 5.7-5) on the manway
covers. The time that the asorbent is removed from the shipping
container and plastic bag until it is inside the sealed SF6 gas
compartment should be less than 2 hours.
Apply blue loctite #242 to the threads of the bolts.
Remove all of the old gas sealant from the enclosure flange and
the inspection cover with a plastic scraper and scotchbrite with
ethanol or toluol.
Apply new gas sealant to the enclosure flanges and
install the gas sealing O-rings according to Appendix A, SF6 gas
seals.
Fig. 5.7-5 Absorbent Assembly
Note: Assembly must be completed before the sealant hardens.
One milli-meter film of sealant will harden in approximately
one hour.
Inspect, clean and close the interrupter enclosure assembly.
Torque the bolts according to Appendix B.
Evacuate the interrupter enclosure to 1 mm Hg (1 torr). Continue
evacuating for an additional 1/2 hour and refill with SF6 gas to the
normal operating pressure compensated for temperature.
Mitsubishi Electric Power Products, Inc.
PEB0084 Rev. D 03/06
Fig. 5.7-6 Gas Seal Joint
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6. Installation
SECTION 6 — INSTALLATION
The circuit breaker was completely assembled, adjusted and tested at the factory before shipping.
The subframe was disassembled for shipment. With proper care during assembly at the site, no
adjustments will be necessary and the breaker should operate according to specifications.
Technical assistance is available from Mitsubishi Electric Power Products, Inc. The time for
technical assistance can be minimized if the support frame is bolted to the foundation, the breaker
is bolted to its support frame, and the control and current transformer wiring is complete. Temporary wiring should be provided if the permanent wiring can not be completed.
6.1 Installation Material and Tools
The following is a list of materials, tools and equipment used during the installation of the circuit
breaker. Time will be saved if the material, tools and equipment are at the site before the installation begins. Inventory all parts against the packing list and note any shortage.
6.1.1 Supplied With Circuit Breaker
Manual hand jack assembly
Fill valve adapter, 9/16-18 37° SAE to Dilo DN8
Paint
Manual breaker operation
Evacuation and gas filling
Touch-up paint
6.1.2 Supplied by Purchaser
5 ton crane and six foot minimum nylon slings for 4 point pickup of circuit breaker
Two Come-a-longs or block-and-tackle to level load
Bucket truck or ladder to reach high voltage terminal
SF6 Gas regulator
SF6 gas hose with 9/16-18 UNF fittings
Set of metric sockets (8, 10, 13, 17, 19, 24, 36 mm)
Set of metric open end or box wrenches (8, 10, 13, 17, 19, 24, 36 mm)
Pliers and screwdriver
Wire cutter, stripper and crimper
Silicon sandpaper and scotchbrite
Solvent or thinner and alcohol
Electrical Joint Compound
Shackles
Hammer and crowbar or nailpuller and saw
Clean waste cloth or lint-free wipers
Multi-meter
Micro-ohmmeter
Megger (500V & 1000V)
Breaker Time
Mitsubishi Electric Power Products, Inc.
PEB0084 Rev. D 03/06
6-1
100/120SFMT32LE/32HLE Circuit Breaker
6.2 Installation Procedure and Checklist
The following is the sequence of installation and check list.
Item
Requirement
Reference
Complete
Foundation
Foundation dwg check
Level and shim
6.3.1
______
Support frame
Ground pad orientation
6.3.1
______
Breaker Ass'y
Level and shim
Joint Compound
Torque bolts
Connect ground leads
6.3.2
APX-G
APX-B
______
Fill
Leak test
Alarm pressure
Lockout pressure
Temperature
6.3.3
6.4.2
6.4.3
6.4.3
APPEX-E
______
______
______
______
Wiring
Connect station wiring
Tightness of all connections
Insulation test
6.3.4
APX-I
______
Manual Operation
Hand jack
5.6.1
______
SF6 System
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PEB0084 Rev. D 03/06
6. Installation
6.3 Installation of Circuit Breaker
CAUTION: Do not apply excess force or heavy impact to the porcelain bushings,
operating mechanism, mechanism and control housings or gas piping.
6.3.1 Foundation and Subframe
Verify the positions of the anchor bolts and grounding wires with the breaker outline and foundation drawings. Check the level of the foundation at the leg mounting area. Use shims to level the
four surfaces to within 3mm (0.12in.).
Fig. 6.3-1 Subframe
Place the legs of the subframe on the foundation anchor bolts. Temporarily tighten the foundation
bolts by hand. Minor realignment of legs may be required. Do the final torquing of the bolts after
the breaker assembly is mounted on the subframe and leveled. Bolt the cross braces of the subframes to the vertical legs with the M16x35 bolts and nuts. Bolt each pair of braces together at
the center with M16x40 nut and bolt and three washers. Apply electrical joint compound to the
bottom of the breaker legs and to the top of the subframe legs according to Appendix G.
Fig. 6.3-2 Mounting Breaker
Mitsubishi Electric Power Products, Inc.
PEB0084 Rev. D 03/06
6-3
100/120SFMT32LE/32HLE Circuit Breaker
6.3.2 Circuit Breaker
Use block and chains or come-a-longs on the front end of the breaker and slings on the back end
to keep the breaker level when lifting. Place the breaker assembly slowly onto the subframe while
matching the breaker bolt holes with the subframe bolt holes. Bolt the breaker to the subframe
with the M24x70 bolts and nuts.
When the breaker is level and in its proper position, torque the M16 bolts to 1200 kg-cm
(87 lbs-ft) and the M24 bolts to 2200 kg-cm (159 lb-ft).
6.3.3 SF6 Gas Filling
The circuit breaker is assembled and gassed with positive SF6 gas pressure for shipment. It is not
necessary to evacuate the breaker after installation and prior to filling with SF6 gas unless the
pressure gauge shows no gas pressure indicating possible shipping damage. If there is a loss of
SF6 gas, the source of the leak must be determined and repaired.
Connect the 9/16" 37° SAE to Dilo DN8 adapter to the gas fill hose first and then connect the
adapter to the Dilo DN8 fitting on the breaker. Fill the enclosure to its normal SF6 operating
pressure compensated for the ambient temperature.
Note: The DN8 service port opens as soon as the DN8 adapter is connected to the port, permitting passage of the SF6 gas.
Refer to the SF6 pressure versus temperature graph, Fig. E-1 in the Appendix E, Evacuating and
Filling, to determine the normal operating pressure after measuring the ambient temperature.
6.3.4 Wiring Connection
Refer to the wiring diagrams for the specific breaker to identify the proper terminals to connect
breaker to the station controls. A recommended procedure for installing and terminating multiconductor control cable is shown in Appendix I.
6.3.5 Manual Circuit Breaker Operation
The circuit breaker should be manually opened and closed before it is electrically operated to
verify there was no damage caused by shipping or installation.
6-4
PEB0084 Rev. D 03/06
6. Installation
6.4 Installation Testing and Inspection
The circuit breaker was completely assembled, tested and timed as a three phase unit at the
factory. The following field tests are to confirm that the breaker was not damaged during shipping
and was installed correctly.
6.4.1 Contact Resistance
Measure the resistance of the high voltage circuit from terminal to terminal with the breaker in the
closed position (refer to the factory test report for resistance values). The test should be done
with a minimum current flow of 100 amperes DC.
6.4.2 SF6 Gas Leak Test
The factory prepared joints have been leak tested. It is only necessary to test the SF6 gas seals
made during the installation. Refer to Appendix E, Leak Testing.
6.4.3 SF6 Pressure Switch Test
Attach an electric signal (light, bell, ohmmeter) to the terminals of the switch contacts. Close the
SF6 isolation valve and slowly release the SF6 gas by opening the sampling valve. Record the
alarm and cutout pressure during decreasing pressure. Record the temperature. Open the stop
valve and close the sampling valve after the testing and before the breaker is put into service.
CAUTION: Breaker must be de-energized and the D.C. power control switch open when
testing the SF 6 gas from the sampling valve.
The sampling valve and the service valve must be closed and the isolation valve must be
open before the breaker is put in service.
6.4.4 Operation Test
The breaker has been completely tested at the factory. Therefore, it is not necessary to repeat all
of the mechanical operations and timing tests after the installation. Some operations, however,
should be done to verify that the breaker was wired correctly.
Prior to operations, check the following items:
a.
b.
c.
d.
Verify that the SF6 isolation valve is open and the service and sampling valves are closed..
SF6 gas pressure is correct.
Manual operation jack has been removed.
Close and trip preventive pins have been removed.
Mitsubishi Electric Power Products, Inc.
PEB0084 Rev. D 03/06
6-5
100/120SFMT32LE/32HLE Circuit Breaker
6.4.5 Timing Tests
The tests are made at the rated voltages and nominal SF6 gas pressure. An oscillograph or digital
timer may be used for the timing tests. The measurements to make are listed in Appendix T,
Breaker Operation Testing.
6.4.6 Final Inspection
Make a final visual inspection of the equipment. Use the touch up paint supplied with the equipment to repair the areas where the paint was chipped during shipping and installation.
6-6
PEB0084 Rev. D 03/06
7. Performance Specification
SECTION 7 — PERFORMANCE SPECIFICATION
Rated SF6 Pressure (fill pressure @ 20°C)
Maximum SF6 Pressure @ 20°C
Low Pressure SF6 Alarm 63GA @ 20°C + 5 psig
Low Pressure SF6 Cutout 63GL @ 20°C + 5 psig
Alarm minus Lockout (63GA - 63GL)
500 kPag
520 kPag
370 kPag
320 kPag
25-75 kPag
Weight of SF6 Gas -
25 kg (55 lbs.)
30 kg (66 lbs.)
100SFMT32LE/32HLE
120SFMT32LE/32HLE
(5.0 kg/cm2)
(5.2 kg/cm2)
(3.8 kg/cm2)
(3.3 kg/cm2)
(.1-.5 kg/cm2)
SF6 Gas Leakage Per Year
<1%
Main Circuit Current - 100SFMT32LE/32HLE
Resistance @ 20°C 120SFMT32LE/32HLE
<260 Micro-ohms
<280 Micro-ohms
Main Circuit Insulation Resistance, Minimum
Control Circuit Insulation Resistance, Minimum
Current Transformer Resistance, Minimum
>1,000 Megohm
>1 Megohm
>1 Megohm
(71 psig)
(74 psig)
(54 psig)
(47 psig)
(1-7 psig)
Timing Data @ Rated Voltage
Open Operation
Contact Part
Contact Sychronization, Maximum
< 28 ms
< 2 ms
Close Operation
Contact Make
Contact Sychronization, Maximum
< 150 ms
< 4 ms
Reclosing Operation - Trip Coil
Energization to Contact Make
< 300 ms
Mitsubishi Electric Power Products, Inc.
PEB0084 Rev. D 03/06
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Appendices General Procedures
APPENDICES GENERAL PROCEDURES
Procedures common to MEPPI SF6 gas circuit breakers during installation, inspection, and maintenance are described in the appendices section. Maintenance personnel should familiarize themselves
with these procedures before doing any work on the equipments.
A
B
C
D
E
F
G
I
O
P
Q
T
W
Y
SF6 Gas Seals
Torquing of Bolts
Lubricating
Application or Replacement of Absorbent
Filling, Removal, and Leak Detection of SF6 Gas
Weather Sealing
Application of Electrical Joint Compound
Installation and Terminating Control Cable
Gauge Pressure Versus Altitude
Internal/External Retaining Ring
Main Enclosure Heating System
Breaker Operation Testing
Composite Insulators
Replacing Rupture Disk
SF6 Gas Material Safety Data Sheet
Mitsubishi Electric Power Products, Inc.
PEB0084 Rev. D 03/06
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A. SF6 Gas Seals
APPENDIX A — SF6 GAS SEALS
These instructions describe the procedure for making a leak-tight seal for bolted O-ring joints on
SF6 gas filled equipment. The gas sealant is applied to the complete surface of the flange face
between the O-ring groove and the outside edge of the flange to eliminate corrosion caused by
water entering between the flanges.
Note: Do not reuse O-rings from previous gas sealed joints.
A.1 Material
Gas sealant 100g, KE44 RTV W
Ethanol/Toluol/thinner
Kimwipe
A.2 Installation of O-ring
Clean the O-ring groove, flange face, and the adjoining sealing surface with clean waste cloth or
kimwipe towels moistened with ethanol, toluol, or thinner. Use a plastic or wooden paint scraper
to remove old gas sealant.
Dry the groove and sealing surface. Inspect the groove and the sealing surface for defects such as nicks,
dents, lint, or dirt.
Inspect the O-ring for cuts, pits, or other surface defects, and dust. Clean the O-ring with ethanol,
dry it, and place it in the groove to check that it is the proper size.
A.3 Applying the Gas Sealant
The gas sealant is applied to the O-ring groove and the flange surface according to the procedures
outlined in Figure 2.
A.4 General Precautions
Do not apply the sealant to the gas side of the O-ring groove.
Do not use any type of metal scraper on the sealing surface.
Complete the assembly within an hour before the gas sealant
hardens. The minimum hardening time is 1 hour for a thickness
of 0.04 inches (1 mm).
Do not mix grease with the sealant.
Remove excess sealant after the joint is assembled.
A.5 Small SF6 Gas Seals
Fig.A.4-1
The gas sealant is applied to the complete surface of small flanges with O-ring grooves (<38 mm (1.5")
dia.) used in the SF6 gas piping system.
Mitsubishi Electric Power Products, Inc.
PEB0084 Rev. D 03/06
A-1
100/120SFMT32LE/32HLE Circuit Breaker
Fig. A.5-1 Application Procedure for Gas Sealant
A-2
PEB0084 Rev. D 03/06
B. Torquing of Bolts
APPENDIX B — TORQUING OF BOLTS
These instructions cover the torque values and standard method for the tightening of bolts on circuit breakers
and switchgear assemblies.
Note: Consult MEPPI for torque values on all other connections (i.e., hose fittings, tubing fittings, conduit
connections, etc.).
B.1 Torque Values
Torquing of the bolts is recommended to obtain uniformity in the bolt loads and to avoid the possibility
of bolt failure in pressure-tight joints. When a number of bolts are used to fasten two parts together,
the load carried by each bolt depends on the tightness of the bolt relative to the other bolts; the tighter
the bolt, the greater the load. It is also important that joints be torqued symmetrically.
The standard torque values are for metal-to-metal bolted joints for various sizes of bolts. The torque
values are reduced considerably for bolted joints which have an insulator between the metal flanges.
Care must be taken not to over-torque joints with insulators. Consult MEPPI for the torque value if a
joint has an insulator between the flanges.
Table B.1-1 Standard Torque Values
Bolt
Size
Hex
Head
Torque (kg-cm)
Standard
Torque (N-m)
Standard
Torque (Lb-ft)
Standard
M6
10 mm
60
5.9
4.3
M8
13 mm
140
13.7
10.1
M10
17 mm
280
27.5
20.3
M12
19 mm
480
47.1
34.7
M16
24 mm
1200
118.
M20
30 mm
2200
215.
159.
M22
32 mm
3000
294.
217.
M24
36 mm
3900
382.
282.
M30
46 mm
7700
755.
557.
86.8
Bolt size is designated by “Mxx.” Ex. M6
Wrench size is designated by “xx mm.” Ex. 6 mm
Mitsubishi Electric Power Products, Inc.
PEB0084 Rev. D 03/06
B-1
100/120SFMT32LE/32HLE Circuit Breaker
B.2 Torquing Sequence (1-2-3-4. etc.)
Torque the bolts in a symmetrical order with a torque wrench. The sequence should be repeated to assure
all of the bolts are tightened to the proper torque.
Fig. B.2-1
B-2
PEB0084 Rev. D 03/06
C. Lubricating
APPENDIX C — LUBRICATING
The correct lubricant must be applied and used as specified in the Instruction Book. These lubricants can
be ordered through the Mitsubishi Electric Power Products’ sales office.
C.1 Application of Lubricants
Diamond Low Temperature Grease No. 2
Mitsubishi Oil Company
Linkage and Mechanism in Air
Darina Grease #2
Shell Oil Company
Linkage and Mechanism in SF6 Gas
Noxlub Contact Grease
Kluber Lubrication N.A., Inc.
Interrupter and Bushing Conductor
Contacts
C.2 Procedure
a. Clean the various parts of the switchgear to be greased. Remove the old grease, oil, water, and
dust.
b. Keep the lubricants and greases clean and free of contaminants. This can be confirmed by feeling
the grease between the fingers.
c. Apply the grease thinly and uniformly to the part.
Note: Do not mix different greases.
d. Assemble the parts before the grease or parts become contaminated with dust or dirt.
Mitsubishi Electric Power Products, Inc.
PEB0084 Rev. D 03/06
C-1
100/120SFMT32LE/32HLE Circuit Breaker
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C-2
PEB0084 Rev. D 03/06
D. Application or Replacement of Absorbents
APPENDIX D — APPLICATION
OR
REPLACEMENT
OF
ABSORBENTS
These instructions cover the installation or replacement of absorbent in SF6 gas compartments.
D.1
Purpose of Absorbent
Absorbent is used in the SF6 gas enclosures to maintain a dry atmosphere. The absorbent should
be replaced each time the gas enclosure is opened.
D.2 General Cautions
The time from removing the absorbent from its container and plastic bag until it is inside the
sealed SF6 gas compartment should be less than two hours.
The SF6 gas enclosure should be evacuated as soon as possible after the absorbent is placed
inside the equipment.
Do not expose the absorbent directly to moisture such as rain or high relative humidity.
D.3 Absorbent Material and Accessories
The absorbent is a molecular sieve material and is available in pre-packaged bags in sealed
containers.
Absorbent, Z column F-9
Absorbent bags
Loctite Adhesive
Zeolite, F9
#242 or cat #073-31 (#277)
D.4 Procedure
Remove the inspection manway or blind cover with the attached absorbent case from the SF6
gas compartment.
Fig. D.4-1
Mitsubishi Electric Power Products, Inc.
PEB0084 Rev. D 03/06
D-1
100/120SFMT32LE/32HLE Circuit Breaker
Remove the case for the absorbent from the cover. Add or replace the absorbent in the case. Replace
the case plate and mount the assembly to the inspection manway cover or blind cover with the bolts
provided.
CAUTION: Apply adhesive (ex: loctite) to the M8x12 bolt threads before installing the
bolts.
Fig. D.4-2
Clean the sealing surfaces of the compartment cover and the flange of the equipment. Insert
the O-ring and attach the cover according to the procedure for SF6 gas sealing in Appendix A.
Fig. D.4-3
D-2
PEB0084 Rev. D 03/06
E. Filling, Removal, and Leak Detection of SF6
APPENDIX E — FILLING, REMOVAL, AND LEAK DETECTION OF SF6
These instructions provide the information for evacuation, filling, or adding SF6 gas during installations
or servicing of the circuit breaker. Reference should be made to the Instruction Book for information
and precautions to be followed during the handling of SF6 gas.
E.1 Gas Handling Equipment
An SF6 gas service trailer is recommended for breakers which use large amounts of SF6 gas. A
typical unit is shown in Figure 1. These units contain a vacuum pump, compressor, storage tank, SF6
filter and dryer, and the valving and instrumentation necessary to implement the evacuation of air and
the removal, storing, or filling of the breaker with SF6 gas.
Fig. E.1-1. SF6 Gas Reclaimer
SF6 gas handling equipment manufacturers have also developed gas handling equipment for “puffer type”
breakers which contain small volumes of SF6 gas. The equipment can easily be transported on a pickup
truck.
E.2 Evacuating and SF6 Gas Filling Adapters
SF6 gas service trailers are usually supplied with 1¼" hoses terminated with a female 1 5/8-12 37°
SAE fitting for SF6 gas evacuation and filling. An adapter is available to connect to the hose and is
bolted to the gas feeding inlet of the breaker after the inlet cap is removed. The adapter for evacuating
the gas is terminated with a male 1 5/8-12 37° SAE thread.
An adapter with an 9/16" 37° SAE fitting at one end and a Dilo DN8 fitting at the other end is used to
connected a hose from the SF6 gas cylinder to the Dilo DN8 fill valve on the circuit breaker. This
adapter will mate with any hose terminated with a female 9/16-18 37° SAE thread available at most
hose suppliers. This adapter is automatically supplied with each order.
Mitsubishi Electric Power Products, Inc.
PEB0084 Rev. D 03/06
E-1
100/120SFMT32LE/32HLE Circuit Breaker
Fig. E.2-1 Evacuating and Gas Filling Adapters
E.3 Evacuating and SF6 Gas Filling
Some circuit breakers are shipped from the factory partially filled with SF6 gas. It is not necessary to
evacuate these breakers if the breakers were not opened during storage or installation. These breakers should be filled with SF6 to the proper pressure by following the procedures in Section 4, “Adding
SF6 Gas,” of this appendix.
Circuit breakers which have been open to the atmosphere, either during installation or servicing,
require evacuation before being filled with SF6 gas.
E.3.1 Evacuation
The gas compartment must be evacuated to remove the air and any moisture that may have accumulated in the
compartment while it was open and exposed to the atmosphere.
1. First connect the DN8-9/16" adapter to the 9/16" to1-5/8" adapter. Then connect the adapters to the 1¼"
vacuuming hose.
2. Connect the hose with the adapters from the vacuum pump or service trailer to the DN8 connection on the
circuit breaker, start the vacuum pump.
Note: The DN8 service port opens as soon as the DN8-9/16" adapter is connected to the port,
permitting passage of SF6 gas.
3. Observe the vacuum gauge - after reaching 1 mm (1 Torr - 1000 microns) pressure, continue operating the
vacuum pump for 30 minutes to 1 hour.
4. If a service trailer is being used, follow the service trailer instructions for shutting off the vacuum pump.
CAUTION: A compartment under vacuum can suck the oil from some vacuum pumps into the
evacuated compartment when the pump is not running. If the vacuum pump stops, the valve between
the pump and the hose should be closed immediately. A check should be made to determine if the
vacuum pump oil backflowed into the hose.
E-2
PEB0084 Rev. D 03/06
E. Filling, Removal, and Leak Detection of SF6
E.3.2 Vacuum Leak Check
Close the valve on the service hose to the vacuum pump and shut off the vacuum pump.
Measure the pressure of the gas compartment.
The compartment passes the leak test if the pressure rise is not more than 1 mm (1 Torr - 1000
microns) in four hours. If the pressure rise is more than 1 torr in four hours, repeat the evacuating and
leak test procedure. If the pressure rise is due to a leak, it must be located and repaired.
The pressure rise may be due to moisture being present in the gas compartment. This can be determined by making a graph of the pressure rise versus time. Measure the pressure rise every half hour
and record it on the graph. If the graph is a straight line after connecting the points together, then the
compartment has a leak. If the curve is exponential, then the rise is due to moisture in the compartment. Continue the evacuation process, if the pressure rise was due to moisture, until the pressure rise
is within the one torr limit.
E.3.3 Gas Filling
If a gas service trailer is being used, the filling of the breaker with SF6 gas is done with the same hose
used for evacuation. Follow the service trailer instructions.
If the service trailer is not being used, the SF6 gas can be supplied to the breaker directly from SF6
bottles as follows:
1. Close the gas service valve at the breaker, shut off the vacuum pump and disconnect the hose.
2. Remove the adapter with the 1 5/8-12, 37° SAE threads from the breaker service valve and
replace it with the adapter with the 9/16, 37° SAE threads. Attach the gas filling hose to the
adapter.
3. Attach a pressure regulator with an SF6 cylinder fitting to the bottle of SF6 gas (an SF6 cylinder
fitting with a 120 psig pressure relief valve may be substituted if a regulator is not available).
Attach and tighten the hose to the bottle connector.
4. Purge the air from the hose by loosening the hose connection at the breaker, opening the SF6
cylinder valve slightly and allowing the gas to flow through the hose and loose fitting for approximately 5 seconds. Tighten the hose fitting at the breaker valve.
5. Open the breaker and the SF6 cylinder valve and fill the breaker with the SF6 gas.
6. After the proper pressure has been achieved, shut off the SF6 supply valve and the breaker service
valve. Disconnect the hose and valve adapter. Cap off the breaker service valve with the O-ring
and blank cover. Do not apply gas sealant to this joint.
Note: The normal fill pressure is determined by measuring the ambient temperature and referring to
the pressure versus temperature graphs. Refer to Figure E-1. Fill the system with SF6 gas to
the required gas pressure.
Mitsubishi Electric Power Products, Inc.
PEB0084 Rev. D 03/06
E-3
100/120SFMT32LE/32HLE Circuit Breaker
E.4 Adding SF6 Gas
If the gas pressure drops below the normal pressure, it may be necessary to restore the breaker to the
correct pressure by adding gas. This can be done by the following procedure.
1. Check the breaker valve to make sure it is closed, then remove the blank cap from the valve outlet.
2. If filling from an SF6 cylinder, attach the adapter with the 9/16, 37° SAE threads (for small hose) to
the breaker service valve. Be sure the O-ring remains seated in the breaker valve outlet. If a service
trailer is used, attach the adapter with the 1-5/8, 37° SAE threads to the breaker valve, connect the
service trailer hose and follow the service trailer procedure.
3. Attach a pressure regulator to the SF6 cylinder or use an SF6 cylinder fitting with a pressure relief valve.
Attach a hose from the SF6 cylinder to the breaker valve adapter.
4. Purge the air by loosening the hose fitting at the breaker valve adapter and "cracking" the cylinder valve
to allow the gas to flow through the hose.
5. Close the gas cylinder valve and tighten the hose fitting. Open the breaker valve and slowly open the
gas cylinder valve to allow the gas to flow into the breaker.
6. Measure the temperature and refer to Fig. E.5-1 for the correct SF6 gas filling pressure.
7. After the correct pressure is obtained, close the gas cylinder valve, close the breaker valve and
disconnect the hose.
8. Replace the adapter with the blank cover. Be sure the O-ring remains in place. Do not apply gas sealant
to this joint
E.5 Removal of SF6 Gas
Prior to servicing a breaker, the instruction book selection describing SF6 gas should be reviewed. Arcing
in SF6 gas results in decomposition products. Precautions must be taken when servicing a breaker that has
been in service, particularly one which has experienced several fault interruptions.
CAUTION: SF6 is heavier than air and will not support life. Do not enter any tank
previously containing SF6 without thorough ventilation. Because it is heavier than air, SF6
gas can accumulate or be trapped in low "pockets". If released to the atmosphere,
precautions should be observed in nearby trenches and depressions where the gas can
accumulate for short periods of time before dispersing into the atmosphere.
CAUTION: Arced SF6 gas is accompanied by a strong and irritating odor indicating toxic
decomposition products. These products are injurious, and exposure to them should be
avoided. The arc powders are reactive with moisture and, if inhaled, could cause irritation in
the nose, throat and lungs. Contact with body perspiration could cause skin irritation.
Thoroughly ventilate the area until the odor is insignificant. Clean out the powders,
preferably with a vacuum cleaner. If a considerable amount of powder is evident, wear a dust
mask to prevent inhaling the powder.
E-4
PEB0084 Rev. D 03/06
Fig. E.5-1 Pressure Versus Temperature for Normal Pressure of 5Kg/cm2 (71 psig) SF6 gas
E. Filling, Removal, and Leak Detection of SF6
Mitsubishi Electric Power Products, Inc.
PEB0084 Rev. D 03/06
E-5
100/120SFMT32LE/32HLE Circuit Breaker
E.5.1 Salvaging
1. Check the breaker service valve to make sure it is closed, then remove the blank cover from the
valve outlet.
2. Attach the adapter (1 5/8-12 37° SAE fitting) to the breaker service valve outlet.
3. Attach the service trailer hose to the adapter fitting.
4. Follow service trailer instructions for removal of the SF6 gas.
5. After removal of the SF6, close the breaker valve, remove the hose, and then open the breaker
valve, allowing atmospheric air to flow into the breaker.
CAUTION: Powders from arcing are reactive and can cause irritation of nose, lungs, and
skin. Thoroughly ventilate breaker compartments before entering. Clean out powders,
preferably with a vacuum cleaner. If a considerable amount of powder is evident, wear a
dust mask to prevent inhaling the powder.
E.6 Leak Inspection
E.6.1 Leak Check with Leak Test Solution
Daub test solution over the gas sealed connection. Check for bubbles for at least 30 seconds. If no bubbles
appear, wipe off the solution.
Fig. E.6-1 Leak Check with Leak Test Solution
E.6.2 SF6 Leak Detector
The permissible leak rate from the breaker should be less than 1% per year. This can be determined
approximately by using a SF6 leak detector and enclosing the components. Envelope the sealed SF6
gas connection in a bag made of plastic sheet and leave it for more than 3 hours. Check for the leak
by means of an SF6 gas leak detector. The operating procedure for the SF 6 gas leak detector is
explained in the leak detector instruction manual.
E-6
PEB0084 Rev. D 03/06
E. Filling, Removal, and Leak Detection of SF6
Fig. E.6-2 Leak Check With Leak Detector
The leakage rate (Q) for each gas seal is as follows:
(Q)=VM x 103 (cc/hr)
T
Where, V: Volume (liters) between the equipment being inspected and the sheet (1,000cc = 1 liter)
(1 liter = 1 quart = 0.03531 ft3.)
M: Indication value of detector (ppm)
T: Time during which the bag is left in place (hours)
The leakage rate in % per year (q) can be determined:
q = 365 x 24 x
Q____ x 100
1000
(P + 1) x V t
1.033
(For P in kg/cm2)
q = 365 x 24 x
Q_____ x 100
1000 (P + 1) x Vt
101.325
(For P in kPa)
q = 365 x 24 x
Q_____ x 100
1000
(P + 1) x V t
1.013
(For P in bar)
q = 365 x 24 x
Q_____ x 100
1000 (P + 1) x Vt
14.696
(For P in psig)
OR
OR
OR
Where, P: Rated gas pressure (kg/cm2, kPa, bar, or psig).
Vt: Total volume of gas in equipment in liters.
Mitsubishi Electric Power Products, Inc.
PEB0084 Rev. D 03/06
E-7
100/120SFMT32LE/32HLE Circuit Breaker
E.6.3 Leak Test with Pressure Gauge (Long Term)
Periodic recording of the gas pressure and temperature will identify a leak rate. Because the pressure
will vary with temperature, it is necessary to determine the pressure drop caused by leakage by referring to the pressure versus temperature graph for the specific breaker. Determine the pressure difference between the measured pressure and the constant density line. Unless the leak is excessive,
thereby making corrective action an obvious conclusion, several gas pressure readings should be made
over a period of days or weeks to properly identify the leak rate because of the unstable temperature
conditions within the apparatus. The leakage rate (q) in % per year should be less than 1% and can be
determined as follows:
q=
p 365 x 100 % /yr
Pxt
To determine the leak rate (Q), as a function of cc/hr, use the following relationship related to the
pressure loss:
q=
1000_ x Vt x p/t
1.033 x 24
(P: kg/cm2)
q=
1000__ x Vt x p/t
101.325 x 24
(P: kPa)
OR
OR
q = 1000_ x Vt x p/t
1.013 x 24
(P: bar)
q=
1000_ x Vt x p/t
14.696 x 24
(P: psig)
OR
Where, p: Pressure drop (kg/cm2, kPag, bar, or psig)
P: Rated gas pressure (kg/cm2, kPag, bar or psig)
t: Days from leakage observed
Vt: Volume of gas in equipment (liters or ft3)
Note: SF6 gas density = 0.42 ft3./lb at 5 kg/cm2. (71.1 psig) and 20°C (68°F).
E-8
PEB0084 Rev. D 03/06
F. Weather Sealing
APPENDIX F — WEATHER SEALING
These instructions cover the weather sealing of joints and hardware to prevent corrosion of the
equipment. Outdoor high-voltage circuit breakers are exposed to all kinds of weather. Moisture
and other pollutants react to cause serious damage to the equipment. The following weathersealing procedures are recommended to reduce the corrosion and extend the life of the equipment.
F.1 Weather Sealant Material
Weather Sealant 100g KE45 RTV (T)
F.2 Application
The weather sealant should be sufficiently applied to the entire area to eliminate the penetration
of moisture into the joints.
The surface and parts to be sealed should be clean and free from any deposit of the solvent used
for cleaning.
Where the sealant is applied between mating surfaces, the assembly of parts should be completed within one hour before the sealant hardens. The minimum set time is one hour for a
0.025 inch (1 mm) thick layer.
F.3 General Cautions
Do not mix the weather sealant with any other grease or water.
Smooth out the weather sealant which extrudes from flange surfaces.
Replace the cap of the tube of weather sealant before storing.
F.4 External Joints
The joints between the flanges and the hardware, particularly in the horizontal position, should
be sealed with the weather sealant.
Fig. F.4-1
Mitsubishi Electric Power Products, Inc.
PEB0084 Rev. D 03/06
F-1
100/120SFMT32LE/32HLE Circuit Breaker
F.5 Attaching Nameplates, etc.
Fig. F.5-1
F.6 Sealing Pipe Entrance
Silicone sealant (KE-45 RTV) should be used for sealing pipe entrances.
Fig. F.6-1
F-2
PEB0084 Rev. D 03/06
G. Application of Electrical Joint Compound
APPENDIX G — APPLICATION
OF
ELECTRICAL JOINT COMPOUND
These instructions cover the application of electrical joint compound to high voltage connections made
of aluminum.
G.1 Scope
Aluminum and copper form a thin film of oxide or salt on their surfaces when exposed to air. Aluminum
develops the film very quickly. This oxide film protects the metal from further corrosion, however, the
film of oxide has a high value of resistance and acts as an insulator. The oxide film must be removed
and joint compound should be applied to the connecting surfaces in order to maintain the efficiency of
the metals as a connector. The joint compound also helps in penetrating the film of oxide during the
cleaning process.
G.2 Procedure
1. Apply a coat of the joint compound to the connecting surfaces of the connectors.
2. Remove the oxide with a stainless steel or aluminum brush for aluminum connectors and a brass
brush for copper connectors, or use nonmetallic abrasive paper.
3. Wipe off the joint compound that contains metal particles.
4. Apply a generous amount of new joint compound to the connecting surfaces within three minutes
after the previous compound is removed.
5. Bolt the connectors together.
6. Remove any excessive joint compound.
Note: Do not use a brush or abrasive paper on silver plated or tin plated connectors. Lightly buff the
plated surfaces to a bright finish with scotchbrite.
Mitsubishi Electric Power Products, Inc.
PEB0084 Rev. D 03/06
G-1
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PEB0084 Rev. D 03/06
I. Installing and Terminating Control Cables
APPENDIX I — INSTALLING AND TERMINATING CONTROL CABLES
I.1 Scope
These instructions cover the installation and termination of control cables to the breaker. This is not
intended to supersede established utility practices, but to provide minimum guidelines.
I.2 Installing Control Cables
1. All control cables to the breaker should be run in conduit or racks.
2. After the cable is installed in the housing, adjust the cable to ensure that the terminals are not
mechanically stressed.
3. After all the wires have been terminated, check the control wiring using a bell or multi-circuit
tester.
4. Check all connections as small nuts and clips may have become loose during transit and handling.
5. After checking the connections, seal the conduit pipe with sealing-compound.
I.3 Treatment of Cable End
1. Cut the cable jacket back to a length greater than the terminal block length (see Figure I.3-1).
2. Strip the metal and vinyl sheaths as shown (refer to Figure I.3-1).
3. Attach the ground lead to the cable’s metal sheath by means of soldering or clamping.
Fig. I.3-1 Cutting Back Cables
Mitsubishi Electric Power Products, Inc.
PEB0084 Rev. D 03/06
I-1
100/120SFMT32LE/32HLE Circuit Breaker
4. To waterproof the cable insulation, both ends shall be daubed with silicone compound before they
are wrapped with insulation tape. Wind insulation tape around the end of the jacket, metal sheath
and vinyl sheath in a half turn overlap and double winding fashion. (Ex. FB tape)
Fig. I.3-2 Terminating cable wires
5. Connect the ground lead of each cable to the grounding bar in the mechanism housing. The metal
sheath of the cable is grounded at one end only.
I-2
PEB0084 Rev. D 03/06
O. Gauge (SF6 ) Pressure Versus Altitude
APPENDIX O — GAUGE (SF6) PRESSURE VERSUS ALTITUDE
The gauge is set at sea level at the factory. The gauge will read approximately 0.0037 kg/cm2
(0.53 psi) higher than the actual gas pressure in the enclosure for each 1,000 feet in altitude above sea
level. The higher gauge reading is not significant until the altitude is 4,000 feet or higher.
The user has a choice of either recalibrating the gauge with a test gauge calibrated for the higher
altitude or adding additional gas to the enclosure to compensate for the higher altitude.
Fig. O-1 Correction Factor Versus Altitude
Mitsubishi Electric Power Products, Inc.
PEB0084 Rev. D 03/06
O-1
100/120SFMT32LE/32HLE Circuit Breaker
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PEB0084 Rev. D 03/06
P. Internal-External Retaining Ring (C-Ring)
APPENDIX P — INTERNAL-EXTERNAL RETAINING RING (C-RING)
These instruction describe the attachment of the internal/external retaining ring (C-ring). The method of
attaching the C-ring is critical.
1. Use retaining ring plier, type 51-1A or 511B, when attaching C-rings from sizes 8 to 20.
2. The distance between the two holes in the C-ring should not be greater than dimension “A” in Table P-1
when spreading the holes to attach the C-ring.
Table P-1
C-ring Size
10
13
16
20
Dimension A (mm)
8.0
11.0
14.0
13.5
Fig. P-1
3. The square edge of the C-ring should be toward the end of the bar pin and the round edge should be
toward the backside of the bar pin groove.
Fig. P-2
4. Confirm that the C-ring is in the groove properly by inserting the ring plier in the left hole of the C-ring
and rotating the ring clockwise or inserting the ring plier in the right hole and rotating the C-ring counter
clockwise.
Mitsubishi Electric Power Products, Inc.
PEB0084 Rev. D 03/06
P-1
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PEB0084 Rev. D 03/06
Q. Main Enclosure Heating System
APPENDIX Q — MAIN ENCLOSURE HEATING SYSTEM
Q.1 Heating System
SF6 gas at the nominal operating pressure will start to condense to liquid SF6 when the temperature
reaches -35°C (-31°F). Heaters can be provided for the SF6 Gas filled main enclosures to prevent
the SF6 gas from condensing when the circuit breaker is exposed to ambient temperatures below 35°C (-31°F). The heating system consists of a flexible blanket heater wrapped around the main
enclosure, insulation to direct the heat into the enclosures, and a metal cover to protect the insulation
and heater from the ambient elements.
The thermostat and controls for the heater are in the mechanism housing. The temperature sensing
device of the thermostat is located on the bottom of the mechanism housing and is exposed to the
ambient temperature.
Fig. Q.1-1 Heating System
Mitsubishi Electric Power Products, Inc.
PEB0084 Rev. D 03/06
Q-1
100/120SFMT32LE/32HLE Circuit Breaker
Q.2 Electrical Controls (Fig. Q.2-1)
The thermostat (23TH) contact closes when the temperature sensing device senses the ambient temperature has dropped to -25°C (-13°F) and energizes the contactor (42TH). The contactor contacts
(42TH) closes and energizes the heaters for the main enclosures (TH1A…TH3B). The thermostat
contacts open when the ambient temperature warms to -21°C (differential = 4°C to 20°C), and the
heaters are de-energizes.
Note: Refer to the control schematic for the particular order for the actual arrangement of the electric
circuit. The heater’s electrical circuit can be single phase or three phase. Also the heater’s wattage
may change depending on the minimum ambient temperature.
8H
FU5
38A
38
(X)
1
2
4
3
1
3
5
42TH
1
23TH
2
42TH
4
38F
38E
3
42TH
6
38G
38D
1
1
T
H
1
A1
1
T
H
2
2
T
H
3
2
2
42TH
A2
FU5
39
(Y)
3
4
39A
2
39B
39B
39B
1
Fig. Q.2-1 Electrical Controls for Heating System
Q.3 Replacement of Heater Elements
Disconnect the heater circuit from the power source. Disconnect the heater wires at the terminal
blocks in the mechanism housing. Loosen and remove the straps holding the cover in place. Cut away
the weather sealant. Remove the rubber packing from the ends. Drop the lower part of the heater
assembly exposing the heater. Remove the heater and the heater leads.
Place the new heater on top of the insulation, snaking the heater wires through the conduit into the
mechanism housing. While holding the lower half of the assembly against the main enclosure, interlace
the bottom half insulation with the top half insulation.
Add the packing and the stainless steel straps to the two ends and tighten the straps. Seal the ends
with the weather sealant.
Q-2
PEB0084 Rev. D 03/06
Q. Main Enclosure Heating System
Fig. Q.3-1 Heater Assembly
Mitsubishi Electric Power Products, Inc.
PEB0084 Rev. D 03/06
Q-3
100/120SFMT32LE/32HLE Circuit Breaker
This page left blank intentionally.
Q-4
PEB0084 Rev. D 03/06
T. Breaker Operation Testing
APPENDIX T — BREAKER OPERATION TESTING
Note: Contact travel has been recorded and analyzed as part of factory testing. Compare contact
opening and closing times with factory test report values to evaluate circuit breaker performance. It is not necessary to measure contact travel speed as part of breaker installation or
maintenance testing. The following information is provided for reference only.
Travel characteristics of the mechanism can be recorded with a oscillograph, oscilloscope or a
breaker travel analyzer. The transducer of the timing device can be connected to the interrupter's
operating rod by an adapter assembly. Refer to Fig. T-1 for installation of the transducer.
Fig. T-1 Adapter for Circuit Breaker Operation Analyzer
Mechanical timing measurements are made at rated control voltage for the following operations,
close, open, close-open, and open-close-open. The following characteristics can be measured:
Open Operation
Opening time - time from energizing trip coil to last phase contact to part.
Contact synchronization - time from first phase contact to part to last phase contact to part.
Average Opening Velocity - velocity from contact part to 90% of travel.
Mitsubishi Electric Power Products, Inc.
PEB0084 Rev. D 03/06
T-1
100/120SFMT32LE/32HLE Circuit Breaker
Close Operation
Closing time - time from energizing close coil to last phase contact to make.
Contact synchronization - time from first phase contact to make to last phase contact to make.
Average closing velocity - velocity measured from 10% of travel to contact make point.
Close-Open Operation
Closing time - same
Opening time - same
Trip energization - time of energizing trip coil measured from breaker main contact make.
Open-Close-Open Operation
Opening time - same
Reclose time - time from energizing trip coil to breaker main contact make.
The criteria for opening time, closing time, contact synchronization, and contact travel can be found
in the Performance Specifications section of the instruction book or in the Factory Test Report.
Travel velocities are difficult to measure consistently and accurately. They are therefore not
included in the instruction book or the test report. The following figures are typical oscillogram
records marked to identify operating characteristics.
T-2
PEB0084 Rev. D 03/06
T. Breaker Operation Testing
Fig. T-2 Opening Operation
Fig. T-3 Closing Operation
Mitsubishi Electric Power Products, Inc.
PEB0084 Rev. D 03/06
T-3
100/120SFMT32LE/32HLE Circuit Breaker
Fig. T-4 Close-Open Operation
Fig. T-5 Open-Close-Open Operation
T-4
PEB0084 Rev. D 03/06
W. Composite Insulators
APPENDIX W — COMPOSITE INSULATORS
These instructions cover the basic handling and cleaning requirements for composite insulators.
CAUTION: Composite insulators are susceptible to damage if handled in the same
manner as conventional porcelain insulators. Do not wrap slings around the sheds of a
composite insulator.
1. To avoid damaging the insulator, slings or other lifting equipment must not come in contact with
the sheds. Lift the bushing assembly by the flanges only. Lifting eyes may be installed in the
insulator flanges to facilitate handling.
2. Installed bushing assemblies, spare bushing assemblies, and spare insulators will be packaged
for shipping and storage. Exercise caution when removing packaging material to avoid damage
to the rubber sheds. Sharp tools may cut the insulator.
3. Insulators may be cleaned with plain water or alcohol. Some solvents may cause deterioration
of the shed material. Other cleaning agents are acceptable, but may require a thorough rinsing
with water after cleaning. Contact the insulator manufacturer for specific requirements if
cleaning with anything other than water or alcohol.
CAUTION: Cleaning composite insulators with alcohol or solvents reduces the hydrophobicity of the insulating material. Do not energize equipment for at least 24 hours after
cleaning to allow sufficient time for the insulator to recover its hydrophobicity.
Mitsubishi Electric Power Products, Inc.
PEB0084 Rev. D 03/06
W-1
100/120SFMT32LE/32HLE Circuit Breaker
This page left blank intentionally.
W-2
PEB0084 Rev. D 03/06
Y. Replacing Rupture Disk
APPENDIX Y — REPLACING RUPTURE DISK
Rupture disks are provided to protect the main enclosures from excessive pressure. The rupture disks
will burst when the SF6 gas pressure reaches 8 kg/cm²g (115 psig) ±5%. The SF6 gas will flow out
of the enclosure until the gas pressure is equal to the atmospheric pressure of zero kg/cm²g (zero psig).
A cover is provided to protect personnel. The rupture disk must be replaced if it leaks or bursts.
CAUTION: De-energize the breaker and disconnect the controls from the DC power source.
Check that the SF6 pressure is zero in the enclosures.
Remove the six M10x30 bolts, washers, rupture disk cover, rupture disk retainer, and rupture disk.
Remove the O-ring. Remove the old gas sealant with scrapers from the O-ring groove, rupture disk
retainer, and the surrounding area on the inspection cover. Clean the parts with scotchbrite and paint
thinner.
Apply gas sealant, according to Appendix A, to the O-ring groove and the face of rupture disk well
between the O-ring and the outside edge of the well. Insert the new O-ring .
Insert the rupture disk. Replace the rupture disk retainer and cover. Torque the M10 bolts to 280
kg-cm (20lb-ft).
Fig. Y-1 Rupture Disk Assembly
Mitsubishi Electric Power Products, Inc.
PEB0084 Rev. D 03/06
Y-1
100/120SFMT32LE/32HLE Circuit Breaker
This page left blank intentionally.
Y-2
PEB0084 Rev. D 03/06
Material Safety Data Sheet
Mitsubishi Electric Power Products, Inc.
PEB0084 Rev. D 03/06
DS-1
100/120SFMT32LE/32HLE Circuit Breaker
DS-2
PEB0084 Rev. D 03/06
Material Safety Data Sheet
Mitsubishi Electric Power Products, Inc.
PEB0084 Rev. D 03/06
DS-3
100/120SFMT32LE/32HLE Circuit Breaker
This page left blank intenttionally.
DS-4
PEB0084 Rev. D 03/06
Parts List
MITSUBISHI ELECTRIC CORPORATION
PARTS LIST
PEB0067
TYPE 100SFMT40E
120SFMT40E
SF6 GAS CIRCUIT BREAKER
Mitsubishi Electric
Power Products, Inc.
512 Keystone Drive
Warrendale, PA 15086-7537
(724) 772-2555
(800) 624-7425
Rev. D 04/01
Mitsubishi Electric Power Products, Inc.
PEB0067 Rev. D 04/01
PL-1
100/120/SFMT40E Circuit Breaker
This page left blank intentionally.
PL-2
PEB0067 Rev. D 04/01
Parts List
PARTS LIST
To properly identify the parts ordered, specify:
1)
2)
3)
4)
5)
Type of Circuit Breaker
Serial number and/or MEPPI Order number
Parts List Number (or Instruction Book Number)
Part Number and Description
Quantity
Refer also to the separate Instruction Book for the reference figure number.
When ordering the electrical control components, identify the part by:
1)
2)
3)
Control Schematic Number
Component Mark and Description (Device Name)
Type and Rating
(Example of rating table. Consult your own schematic for the correct parts)
Mark
8D1
8D2
8M
8SH
8U
11-52CT
23SH
33hb
Description
Knife Switch
Knife Switch
Knife Switch
Knife Switch
Knife Switch
Breaker Control Switch Close
Thermostat
Mechanism Limit Switch
Type and Rating
CKS 2P 1SA 250VDC
CKS 2P 1SA 250VDC
CKS 2P 1SA 250VDC
CKS 2P 1SA 250VDC
CKS 2P 1SA 250VDC
Square D Type 9001
GRT-90
X-10GM2-B Closing Spring Charged
Discharged
42M
48T
49M
49MX
52a
52b
52c
Motor Contactor
Time Delay Relay Motor Failure
Motor Over Current Relay
49M Auxiliary Relay
Breaker Auxiliary Contact
Breaker Auxiliary Contact
Close CGT1
Open
Closed
SD – K21 250 VDC
SRTD-KN 0.1-60SEC. (SET AT 30) 1255Ω
TH – K20 4-6A (SET AT 4.8 A)
SRD – K5 2a 3b 1485 Ω
Type BM
Example:
(Dwg)
(Mark)
(Description)
(Type & Rating)
H1A2419A
H1A2419A
8D1
52Y
Knife Switch
Anti-pumping Relay
CKS 2P 15A 250V
SRD-k5 2a 2b 1485 Ohm
(Qty)
1
1
Parts may be ordered from the local representative for Mitsubishi Electric Power Products, Inc.
Mitsubishi Electric Power Products, Inc.
PEB0067 Rev. D 04/01
PL-3
100/120/SFMT40E Circuit Breaker
PART
NO.
DESCRIPTION
QUANTITY
I.B. & P.L.B.
FIGURE NUMBER
1110
Main Enclosure
3x1
3.1-1, 3.3-1
1201
Inspection Cover
3x1
3.3-1, 5.7-2
1202
O-ring
3x2
3.3-1, 5.7-2
1203
Flange
3x1
1300
Absorbent Assembly
3x1
3.3-1, 5.7-2
1301
Absorbent
3x1
5.7-5
1303
Cover
3x1
5.7-5
1306
Absorbent Bag
3x1
5.7-5
1400
Rupture Disk Assembly
3x1
3.3-1
1401
Rupture Disc
3x1
1402
Retainer
3x1
1404
Cover
3x1
1405
O-ring
3x3
1501
Supporting Insulator
3x1
3.3-1, 3.4-1
1505
Base Plate
3x1
3.4-1
1506
Supporting Insulator
3x1
3.3-1, 3.4-1
2000
Interrupter Assembly
3x1
3.3-1
2010
Stationary Main Contact
3x1
3.4-1, 5.7-2
2011
Stationary Arc Contact
3x1
3.4-1, 5.7-2, 5.7-4
2013
Stationary Contact Holder
3x1
3.4-1, 5.7-3
2014
Contact Support
3x1
3.4-1, P1
2031
Moving Main Contact
3x1
3.4-1, 5.7-4
2033
Puffer Cylinder
3x1
3.4-1
2034
Piston Support
3x1
3.4-1
2035
Piston Rod
3x1
3.4-1
2040
Nozzle
3x1
3.4-1, 5.7-2
2041
Moving Arc Contact
3x1
3.4-1, 5.7-2, 5.7-4
2042
Piston
3x1
3.4-1
Note: Quantity indicates number of parts per breaker (“3” denotes 3 phases).
PL-4
PEB0067 Rev. D 04/01
Parts List
PART
NO.
DESCRIPTION
QUANTITY
I.B. & P.L.B.
FIGURE NUMBER
2043
Fixed Finger Contact
3x1
3.4-1
2065
Cylinder Support
3x1
3.4-1
2151
Pin
3x1
3.4-1
2154
Pin
3x1
3.4-1
2601
Insulating Rod
3x1
3.3-1, 3.4-1, 3.5-1
2602
Slide Seal Assembly
3x1
3.3-1, 3.5-1, 5.7-1
2603
Operating Rod
3x1
3.3-1, 3.5-1, 5.7-1
2610
Lever Assembly
1
3.5-1
2629
Connecting Rod
1
3.5-1
2631
Interphase SF6 Gas Pipe
1
3.5-1
3010
Trip Coil Assembly
1
5.6-5, 5.6-6
3040
Closing Coil Assembly
1
5.6-5, 5.6-7
3041
Closing Trigger
1
3.6-1, 5.6-7
3042
Trigger Lever
1
5.6-7
3050
Trip Prevention Safety Pin
1
3.6-1
3051
Close Prevention Safety Pin
1
3.6-1
3100
Mechanism Assembly
1
3.5-1, 3.7-1
3101
Cam
1
3.6-1, 5.6-3, 5.6-5
3102
Closing Spring
1
3.6-1
3103
Trip Spring
1
3.6-1
3105
Trip Trigger
1
3.6-1, 5.6-6
3108
Cam Shaft
1
3.6-1
3109
Ratchet Wheel
1
3.6-1, 5.6-3
3111
Closing Holding Latch Pin B
1
3.6-1
3112
Ratchet Shaft
1
3.6-1
3112
Ratchet
1
3.6-1, 5.6-3
3114
Roller
1
3.6-1, 5.6-5
Note: Quantity indicates number of parts per breaker (“3” denotes 3 phases).
Mitsubishi Electric Power Products, Inc.
PEB0067 Rev. D 04/01
PL-5
100/120/SFMT40E Circuit Breaker
PART
NO.
DESCRIPTION
QUANTITY
I.B. & P.L.B.
FIGURE NUMBER
3115
Closing Trigger Spring
1
3.6-1
3116
Trip Trigger Spring
1
3.6-1
3119
Trip Coil
1
3.6-1, 3.7-1, 5.6-6
3120
Trip Plunger
1
3.6-1, 5.6-6
3121
Closing Coil
1
3.6-1, 3.7-1, 5.6-7
3122
Closing Plunger
1
5.6-7
3150
Shock Absorber
1
3.6-1
3152
Trip Holding Latch
1
3.6-1, 5.6-2, 5.6-3
3153
Closing Holding Latch
1
3.6-1, 5.6-2, 5.6-3
3157
Main Lever
1
3.5-1, 3.6-1, 5.6-1, 5.6-5
3160
Trip Holding Latch Pin A
1
3.6-1, 5.6-3
3167
Stationary Core
1
5.6-6
3168
Moving Core
1
5.6-6
3169
Stationary Core
1
5.6-6, 5.6-7
3170
Moving Core
1
5.6-7
3171
Bolt M6
2
5.6-6
3172
Nut M6
2
5.6-6
3173
Nylon Nut M10
1
5.6-6
3174
Bolt M6
2
5.6-7
3175
Nut M6
2
5.6-7
3176
Nylon Nut M10
1
5.6-7
4000
Bushing Assembly
3x2
3.1-1, 3.3-1, 3.10-1
4001
Porcelain Assembly
3x2
3.10-1
4002
Conductor
3x2
3.3-1, 3.10-1
4003
H.V. Terminal Pad
3x2
3.10-1
4004
Voltage Shield
3x2
3.3-1, 3.10-1
4005
O-ring
3x2
3.10-1
4006
Adapter Flange
3x2
3.11-1
Note: Quantity indicates number of parts per breaker (“3” denotes 3 phases).
PL-6
PEB0067 Rev. D 04/01
Parts List
PART
NO.
DESCRIPTION
QUANTITY
I.B. & P.L.B.
FIGURE NUMBER
4007
O-ring
3x2
3.10-1
4008
O-ring
3x2
3.11-1
4101
Contact Assembly
3x2
3.10-1
4500
Current Transformer Assembly
3x2
3.1-1, 3.3-1, 3.10-1
4501
BCTs
3x2
3.11-1
4502
Spacers
3x1
3.11-1
4503
Fitting
3x2
3.11-1
4504
Double-End Bolt & Nut
3x4
3.11-1
4505
BCT Cover
3x2
3.11-1
4507
Gasket
3x2
3.11-1
5000
Mechanism Housing Assembly
1
3.1-1, 3.7-1
5003
Motor
1
3.7-1, 5.6-2, 5.6-3
5007
Terminal Blocks
5101
3x1
3.7-1
Gas Test Valve “E”
1
3.7-1
5102
Gas Fill Valve “D”
1
3.7-1
5103
Gas Sampling Valve “F”
1
3.7-1
5110
Gas Pressure Gauge
1
3.7-1
5111
Gas Pressure Switch
1
3.7-1
5300
Auxiliary Switch Assembly
1
3.7-1
5302
Position Indicator
1
5306
Operation Counter
1
3.7-1
5400
Control Panel Assembly
1
3.7-1
5441
Heater
1
3.7-1
7001
Contact (Arc) Inspection Tool Kit
1
—
7011
Nozzle Tool
1
5.7-2
7012
Moving Arc Contact Tool
1
5.7-2
1
5.6-1
1
5.6-1
7002
7030
Hand Jack Assembly (Manual)
Jack Bar
Note: Quantity indicates number of parts per breaker (“3” denotes 3 phases).
Mitsubishi Electric Power Products, Inc.
PEB0067 Rev. D 04/01
PL-7
100/120/SFMT40E Circuit Breaker
PART
NO.
DESCRIPTION
QUANTITY
I.B. & P.L.B.
FIGURE NUMBER
7031
Bearing
1
5.6-1
7032
Nut, (M24)
1
5.6-1
7033
Pin & Nut (M16)
1
5.6-1
7034
Guide
1
5.6-1
7035
Bolt
2
5.6-1
7036
Socket
1
5.6-1
7024
Adapter, gas filling, 9/16" SAE
1
7025
Adapter, evacuation 1 5/8" SAE
1
Breaker Timing Adapter Assembly
1
Appendix T, Fig. T-1
(for Doble transducer) consisting of:
Rod
1
Mounting Plate
1
Rod End
1
Screws
4
9901
Gas Sealant, KE44-RTV-W (100g)
9902
Weather Sealant, KE45-RTV-T (100g)
9903
Loctite
9906
Grease, Diamond Low Temp #2 (50cc)
9904
Grease, Contact
9905
Grease, Darina #2 (50cc)
Note: Quantity indicates number of parts per breaker (“3” denotes 3 phases).
PL-8
PEB0067 Rev. D 04/01