Made in USA
Internal, Oil-immersed Secondary
Circuit Breakers
Transformers subjected to overloading or applied on lines without overload
protection should be self-protected. Self-protected distribution transformers
offer a complete, unified system of overload protection. The primary means of
protecting the transformer is the circuit breaker, which is designed to give
adequate protection from short circuits and severe overloads.
Options:
Signal Light - One of the features of the self-protected pole-type transformer
is the signal light. When the transformer is thermally overloaded, the signal
light will light, serving as visual evidence that an unusual overload has
occurred on the transformer.
Emergency Overload - Through the use of the emergency overload lever, selfprotected transformers are able to carry overloads in excess of those normally
permitted by the circuit breakers. If a transformer circuit breaker has tripped
and the bimetals are still at trip temperature, the use of the emergency
overload lever may allow the operator to close the circuit breaker to restore
service.
Tri Clamp Low Voltage Bushing
The ECI TriClamp Low Voltage Bushing is equipped with a 5/8-tt-UNC-2A
threaded stud.
C T Junction Box
The ERMCO Components, Inc., CT junction box provides a means to make
external connections to current transformer leads when CT's are internally
mounted within a power transformer.
Features:
•
•
•
Designed for operation under oil
Lead attachment uses only standard tools
Has 21 connection terminals
Rugged cast aluminum housing eliminates the need for painting
Drip Guard
The Drip Guard for bayonet fuse assemblies prevents the dripping of
transformer insulating fluids onto the rubber molded terminators or cables.
Note the positive latching mechanism which prevents accidental removal.
Dry-well Fuseholders for Currentlimiting Fuses
The ECI dry-well fuseholder provides a method of placing dead-front type
current-limiting fuses within the transformer. ERMCO Components' dry-well
fuseholder design is suited to both single- and three-phase padmount
applications. With the addition of the loadbreak function, the fuseholder
provides an economical combination current-limiting fuse and loadbreak
switch. The design provides the benefit of easy hotstick operability to a single
fuse.
Loadbreak fuseholders for padmounted transformers are available at 8.3 and
15.2 kV (125 kV BIL). A special loadbreak design is available with parallel
fuses for high current applications. Non-loadbreak fuseholders for padmounted
transformer applications are available at 8.3, 15.2, and 21.1 kV (125 kV BIL),
both standard and submersible construction. A 21.1 kV (150 kV BIL) rating is
available in standard construction only.
Under Oil Arrester Disconnect Switch
The ECI arrester disconnect switch provides a means of performing electrical
t ti
f di t ib ti
t
f
th t
i
d ith i t
l
d
il
testing of distribution transformers that are equipped with internal under oil
lightning arresters.
The arrester disconnect switch must be open before dielectric testing of the
transformer to prevent misleading results and possible arrester damage.
To open the switch, unscrew the pipe plug, pull the plug out to the stop to
disconnect the arrester ground. Reverse the procedure to close the switch.
This switch is for testing the transformer. It is a de-energized switch only.
Bayonet Fuse Links
Two types of fuse elements are available; a FAULT SENSING fuse (catalog
numbers 9F54MFC---) and a LOAD SENSING fuse (catalog numbers 9F54LFC--). The fault sensing fuse is current sensitive and will isolate the transformer
from the system in case of a fault. The load sensing fuse is sensitive to both
current and oil temperature and will protect against overloads as well as
faults.
Catalog Number
Reference
Number (1)
Curve
Number (2)
Ampere
Rating
353C06
353C08
353C10
353C12
353C14
353C16
353C17
C06
C08
C10
C12
C14
C16
C17
10
15
25
40
65
100
140
358C03
358C05
358C08
358C10
358C12
C03
C05
C08
C10
C12
3
8
15
25
50
Fault Sensing Fuse Links
9F54MFC060
9F54MFC080
9F54MFC100
9F54MFC120
9F54MFC140
9F54MFC160
9F54MFC170
Load Sensing Fuse Links
9F54LFC030
9F54LFC050
9F54LFC080
9F54LFC180
9F54LFC120
1. ECI and Cooper bayonet fuse links are electrically and mechanically interchangeable.2.
ECI and Cooper bayonet fuse link time-current curves are essentially indentical and have
the same curve numbers.
Isolation Link
The ECI Isolation Link is used in a series with bayonet type expulsion fuses to
provide extra protection during re-fusing operations. They are coordinated to
operate at currents that exceed the one-shot rating of the expulsion fuse used
in pad or vault type transformers. The isolation link will melt during
transformer failure so the opened primary circuit of a failed transformer
cannot be re-energized by the line crew.
Low Voltage Distribution Arrester
The LVDA Light Duty Distribution Class surge arrester is designed and tested
in accordance with ANSI/IEEE C62.11 requirements. The LVDA is designed for
protection at the distribution transformer 120/240 VAC secondary bushings.
Various IEEE and industry studies have determined that impulse voltages from
lightning and other sources can enter the transformer secondary and cause
extensive damage. Such surges are typically beyond the energy handling
capability of Secondary Class Surge Arresters.
Low Voltage Breaker
Operating Detail
The new Operating Detail with integral light eliminates the need for a second
hole in the transformer tank wall to accommodate the overload indicating
light.
Tap Changer Switch
The ERMCO Components, Inc. externally operated single phase, under oil tap
changer switch for distribution transformers.
The tap changer switch cap is removed and reversed to make the cap an
operating wrench. The cap-wrench is equipped with a key, preventing removal
until the switching operation is complete.
An indicating arm kit with locking plate and screw is available if conversion
from the cap-wrench is desirable.
Features:
•
Designed for operation under oil
L d tt h
t
l t d
dt
l
•
•
Lead attachment uses only standard tools
Connection configurations:
o Axial tab type terminals with holes for 1/4" dia. bolts (100
ampere rating)
o Radial, #12-#10 crimp terminals (100 ampere rating).
Ratings:
•
•
Maximum continuous current: 100 Amps
Impulse 150 kV
High Voltage Bushing Well
The ERMCO Components, Inc. SURE MAKE separable connector high voltage
bushing well is designed for the termination of primary leads in oil filled
devices such as padmounted transformers. The bushing well mating interface
conforms to the ANSI/IEEE Std. 386 for Separable Insulated Connectors and
will accept switch modules (bushing well inserts) complying with the Standard.
Design Features:
•
•
•
Insulated body is molded of a polyester formulation designed for
excellent electrical and mechanical properties.
The ground shield coating is oil resistant.
The removable stud version is tin plated for corrosion resistance and
ease of removal.
o Use a 5/35" Allen wrench to replace stud, and torque to 100
inch lbs.
Ratings:
•
•
•
Maximum Continuous Line to Ground Voltage 15.2 kV RMS
Continuous Current 200 AMP RMS
Basic Impulse Level 125 kV Crest
200 AMP, 35 kV Class 3Ø Rated
Integrated Bushing
The ERMCO Components, Inc. SURE MAKE separable connector 200 amp, 35
kV Class Three Ø Rated Loadbreak Integrated Bushing meets all requirements
of ANSI/IEEE Std. 386 - Separable Insulated Connector Systems, and
combines the advantages of reliable one-piece design with the operating
features required for underground distribution switching. The bushing is
designed for padmounted transformers, switchgear and other apparatus filled
with transformer oil.
Design Features:
•
•
Insulating body is molded of an epoxy formulation designed for
excellent electrical and mechanical properties.
The ground shield coating is oil resistant. The coating covers from the
elbow cuff mating surface and extends 0.50 inch beyond the sealing
gasket through the tank wall.
Ratings:
•
•
•
•
•
•
•
Maximum Continuous Voltage 35 kV RMS
Maximum Continuous Line to Ground Voltage 21.1 kV RMS
Maximum Continuous Line to Line Voltage 36.6 kV RMS
Continuous Current 200 AMP RMS
Switching 10 Operations at 200 amp RMS at 36.6 kV
Fault Closure 10,000 amp RMS Symmetrical at 36.6 kV after 10
switching operations for 0.17 seconds
Basic Impulse Level 150 kV Crest