®
Lauritz Knudsen Electric
Denmark Technology
Since 1893
SAFETY FIRST ALWAYS
Please read this manual carefully before installing and using the switchgear.
The switchgear can only be installed in indoor locations suitable for electrical
equipment operation.
Make sure that the installation, operation and maintenance are carried out by
professional electricians only.
The applicability and safety of connection conditions and working regulations of field
electrical equipment must be assured.
Any operations related to the switchgear shall observe relevant regulations in this
manual.
DANGER
Special attention shall be paid to the precautions marked with this warning symbol
in the manual.
The load specified in technical parameters under normal working conditions of the
switchgear shall not be exceeded.
The manual shall be put in places where all installation, operation and maintenance
personnel can access.
The technicians of user shall be responsible for all matters affecting operation safety
and shall correctly manage the switchgear.
If you have any questions concerning this manual, we are glad to provide further
information.
Standard Operating Instructions (2-Incoming VCB Panel with 1 VCB Panel as Coupler)
Standard Operation Instruction - brochure 1.indd 1
1
1/7/14 10:53 AM
®
Content
1. General Rules
Lauritz Knudsen Electric
Denmark Technology
Since 1893
3
6. Operation of Switch Cabinet
15
1.1
Overview
3
6.1
Start-up
15
1.2
Standards and Specifications
3
6.1.1 Preparation
15
1.3
Working Conditions
3
6.1.2 Start-up
15
1.3.1 Normal Working Conditions
3
6.2
16
1.3.2 Special Working Conditions
3
6.2.1 Circuit Breaker Truck
16
1.3.3 Precautions
3
6.2.2 Circuit Breaker
16
2. Technical Data
4
6.2.3 Earthing Switch
17
6.2.4 Door of Cable Compartment
18
6.2.5 Electrical/Mechanical Indication/
Monitoring
18
2.1
Electrical Parameter
4
2.2
Internal Fault Tolerance Arc
Performance
4
2.3
External Dimensions and Weights
4
3. Structure Overview
5
3.1
Basis Structure
5
3.2
Enclosures and Clapboards
5
3.3
Compartments in the Switch Cabinet
5
3.4
Interlock/Protection against
Mishandling
6
4. Transportation and Storage
7. Maintenance
19
7.1
Overview
19
7.2
Inspection and Maintenance
19
7.3
Repairing
20
7.3.1 General Repairing
20
7.3.2 Elements Replacement
20
7.4
20
Spare Parts
9
4.1
Delivery Conditions
9
4.2
Packaging
9
4.3
Transportation
9
4.4
Delivery and Intermediate Storage
9
5. Field Installation of Switch Cabinet
10
2
Operation of Switch Cabinet
5.1
General Requirements for
Installation Site
10
5.2
Basic Plane Layout Scheme of
Distribution Room
10
5.3
Foundation
10
5.3.1 Floorboard of Distribution Room
as the Foundation
10
5.3.2 Foundation Frame on a Concrete
Floor
10
5.4
Field Installation
11
5.5
Connection of Power Cables and
Control Cables
12
5.6
Connection of Ground Copper Bar
12
5.7
End of Installation Work
12
All rights reserved to this publication. Proving
all of or part of the content in this Manual to a
third party is prohibited. We reserve the right to
change the data and figures supplied without any
notification in advance.
Standard Operating Instructions (2-Incoming VCB Panel with 1 VCB Panel as Coupler)
Standard Operation Instruction - brochure 1.indd 2
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1. General Rules
®
Lauritz Knudsen Electric
Denmark Technology
Since 1893
1.1 Overview
LKE-VS armored metal-enclosed switchgear (hereinafter referred to as LKE-VS switch cabinet) applies
to three-phase AC single bus bar and single bus bar segmented power system with the function of “Five
Preventions”. The removable parts of the switch cabinet can be assembled with components such as
vacuum circuit breaker (VCB) and vacuum contactor, etc.
1.2 Standards and Specifications
The switch cabinet complies with the standard of IEC298.
The enclosure protection level of switch cabinet is IP4X and the protection level turns into IP2X when
the door of circuit breaker compartment is open and the truck is moved away.
During system installation and running, all the relevant IEC standards and national and local safety
regulations shall be observed and it is also necessary to consider the relevant information provided by
LKE.
1.3 Working Conditions
1.3.1 Normal Working Conditions
The normal working conditions of LKE-VS switch cabinet are as follows:
Indoor environment temperature:
Maximum temperature
Daily mean no larger than
Minimum temperature
+40°C
+35°C
-15°C
Indoor environment humidity:
Daily mean relative humidity
Monthly mean relative humidity
Altitude of installation site
Seismic intensity:
95% and below
90% and above
1000 m and below
No larger than 8 degree
The LKE-VS switch cabinet should be used in locations free of fire, explosion, serious pollution
and chemical corrosion.
1.3.2 Special Working Conditions
It is a must to consult the manufacturer for application in any special working conditions. A
consensus in terms of special working conditions shall be reached between the manufacturer
and user.
•
The impact of reduction in the dielectric strength of the air on insulation level has been
considered when the altitude of installation site is over 1000 m.
•
If the environment temperature exceeds the limit value, it is a must to consider equalizing
or limiting current capacity for the design of main bus bar and branch bus bar. Installing a
ventilation device in the cabinet is favorable to heat dissipation of the switch cabinet.
1.3.3 Precautions
If the humidity of switch cabinet operation site is relatively high, temperature fluctuation speed
is relatively rapid and temperature fluctuation range is relatively large, then the switch cabinet
running in this condition tends to have condensation phenomena. Therefore, the user should
keep the heater running full time when switch cabinet is running or on the standby! However, it
will not be necessary to run the heater while running in high-current.
Standard Operating Instructions (2-Incoming VCB Panel with 1 VCB Panel as Coupler)
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2. Technical Data
®
Lauritz Knudsen Electric
Denmark Technology
Since 1893
2.1 Electrical Parameter of Switch Cabinet
Subject to the technology agreement signed with our client.
2.2 Internal Fault Tolerance Arc Performance
LKE-VS switch cabinet takes the issue of internal fault arc in switch cabinet into account in its design.
It is tested strictly according to IEC298, thus able to effectively ensure the safety of equipments and
operation personnel.
2.3 External Dimensions
External dimensions
4
kV
W
mm
D
mm
H
mm
12
650
1700
2100
12/24
800
1800
2300
12/24
1000
1800
2300
36
1200
2800
2600
Standard Operating Instructions (2-Incoming VCB Panel with 1 VCB Panel as Coupler)
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3. Structure Overview of Switch Cabinet
®
Lauritz Knudsen Electric
Denmark Technology
Since 1893
3.1 Basic Structure (Figure 3/1)
The basic structure of switch cabinet is that it comprises of a fixed cabinet and VCB. See Figure 3/1 for
the switch cabinet and its electrical elements installed. Inlet-line cabinet or outlet-line cabinet are basic
configuration schemes for switch cabinet together with other derivative schemes, for example, bus
coupler cabinet or measuring cabinet, etc. In addition, there are configuration schemes such as fixed
load switch, vacuum contactor truck, isolating truck, etc. The cabinet can be installed against the wall or
face-to-face. Please refer to the order documents for structure details and installation equipments in the
cabinet.
3.2 Enclosures and Clapboards
The enclosure and clapboard of the switch cabinet is made of high quality steel plate with highly
protective paint sprayed on their external surfaces. Thus, the enclosure and clapboard have strong
oxidation and corrosion resistance nature and their rigidity and mechanical robustness are higher than
common low-carbon steel plate. The tops of three high pressure chambers are installed with pressure
relief plate. In case of an internal fault, the pressure in high pressure chamber would rise up and it will
break through the pressure relief plate to release since the cabinet door is securely sealed. Adjacent
switch cabinets are isolated by respective side board. After putting the switch cabinets together, the air
buffer layer still existed which may prevent the switch cabinets from pronging and melted by fault electric
arc. Low-voltage compartment A is assembled into an independent compartment separated with highpressure area. The clapboards isolate the circuit breaker compartment B, CT and cable compartment E
so that even if circuit breaker truck is moved away (The isolation valve will automatically turn off at this
time), it is able to prevent the operator from touching the electrification parts of bus bar compartment C
and cable compartment E.
3.3 Compartments in the Switch Cabinet
Circuit breaker compartment (See Attached Figures 3/1, 3/2 and 3/3)
Circuit breaker truck is installed in circuit breaker compartment B with track. The truck can move between
running position and test/isolation position. When the truck moves from running position to test/ isolation
position, the valve can cover stationary contact automatically; otherwise it can open stationary contact
when moving reverse. The truck can be operated when the door of switch cabinet is closed. Through the
inspection window on the door, it is able to see the position of the truck, ON (circuit breaker closing)/OFF
(circuit breaker opening) buttons on the truck, closing and opening of indicator and charging/releasing
status indicator.
Circuit breaker truck
The truck can be moved manually. The structure of the truck is assembled by steel plate with circuit
breaker and other equipments installed on the top. The contact arm with spring contact system is installed
on the pillar of the circuit breaker. When the truck is inserted into the running position, the contact arm
has the function of electrical connection. The signal, protection and control lines between the truck and
the switch cabinet are connected by a control line plug. The truck is fixed at the test/isolation position
as soon as it is inserted into the switch cabinet, and meanwhile it is reliably connected with the Earthing
system of the switch cabinet. The position of truck is able to be seen through inspection window or
electrical truck position indicator installed on low pressure chamber panel.
Beside the VCB, the truck can be equipped with vacuum contactor, isolation device and the measuring
equipment, etc.
Standard Operating Instructions (2-Incoming VCB Panel with 1 VCB Panel as Coupler)
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3. Structure Overview of Switch Cabinet
®
(cont’d)
Lauritz Knudsen Electric
Denmark Technology
Since 1893
Bus bar compartment
The bus bar is introduced from one switch cabinet to another switch cabinet and it is fixed by branch
bus bar. The rectangular branch bus bar is directly connected to the main bus bar with a bolt without any
connection clamp. All bus bars and branch bus bars are covered with heat-shrinkable tubes.
Cable compartment (Figure 3/1)
CT and Earthing switch are installed at the back of cable compartment. When the door of cable
compartment opens, there is enough room for the worker to enter into the cabinet and to install cables.
The bottom panel covered at the entrance of cable is slotted and detachable which is convenient to site
operation. The opening of variable-diameter seal ring on bottom panel passing through primary and
secondary cable shall match with the installed cable to prevent small animals getting into it.
For cable trench high in humidity, it is suggested that the switch cabinet shall be airproofed with
fireproofing mud and epoxy resin.
Low voltage chamber (Figure 3/1)
Secondary elements of switch cabinet are installed in low pressure chamber and on the door. Control
line trunking has ample space and cover board. The line trunking on the left is used to introduce and
educe the wires between switch cabinets; while the line trunking on the right is used to lay internal wires
in switch cabinet. The traversing hole for control line on side board of low pressure chamber is used to
connect with control power supply.
3.4 Interlock/Protection against Mishandling
A series of interlocking devices are provided to prevent dangerous situations and mishandling which
might lead to serious consequences fundamentally, thus protecting both operators and the switch
cabinet. The functions of interlocking devices are as follows:
➢
When circuit breaker and Earthing switch are in the OPEN position, the truck can be moved from
the test/isolation position to running position. In this state, it is able to move reversely (mechanical
interlocking) as well.
➢
Only when the truck is fully in the test or running position, the circuit breaker can be closed
(mechanical and electric interlocking).
➢
When the truck is in running position, the plug of control wiring plug is locked so that it cannot be
pull out and the middle door cannot be opened (mechanical interlocking).
➢
Only when the truck is in the test/isolation position or moved out, the middle door can be opened
and the Earthing switch is permitted to be closed (mechanical interlocking).
➢
When the Earthing switch is closed, the truck cannot be moved from the test / isolation position to
running position (mechanical interlocking).
➢
When PT truck is in the running position, the lower cabinet door cannot be opened.
Instead, it can be opened only when the truck moves backward to the test position.
➢
6
Some additional interlocking devices can be assembled on the truck and/or Earthing switch
operating mechanism, such as latching electromagnet. The user should forward the requirement
at the time of placing an order.
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3. Structure Overview of Switch Cabinet
®
(cont’d)
Lauritz Knudsen Electric
Denmark Technology
Since 1893
Figure 3/1: Sectional view of LKE-VS inlet-line cabinet or outlet-line cabinet basic structure
Compartments:
A
Low- voltage compartment
B
Circuit breaker compartment
E
CT and cable compartment
Major components:
1
Connection bus bar
3
Cross-core CT
5
Sensor
7
Earthing switch
9
Pressure relief channel
11
Circuit breaker truck
13
PT truck
C
D
PT compartment
Bus bar compartment
2
4
6
8
10
12
14
Contact box
CT current-conducting rod
PT contact box
Cable terminal
Control and protection unit
Handle hold of circuit breaker truck
Handle hold of PT truck
Standard Operating Instructions (2-Incoming VCB Panel with 1 VCB Panel as Coupler)
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3. Structure Overview of Switch Cabinet
®
(cont’d)
Lauritz Knudsen Electric
Denmark Technology
Since 1893
Figure 3/2 Door of the circuit breaker compartment is opened, the truck is in the test position
11.1
11.3
11.5
11.6
11.8
17
Closing and opening of indicator
Opening button
Aviation plug of control line
Charging of indicator
Handle hole of manual charging
Handle hole of earthing switch
11.2
11.4
16
11.7
11.9
Counter
Handle of positioning pin
Interlocking device of control plug
Closing button
Handle hole of truck
Figure 3/3 The circuit breaker truck is in test position
15.1 Upper isolation valve
15.3 PT isolation valve
11.12 Contact arm
13.1 PT contact
8
15.2 Lower isolation valve
11.11 Tulip contact
11
Circuit breaker truck
13
PT truck
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4. Transportation and Storage
®
Lauritz Knudsen Electric
Denmark Technology
Since 1893
4.1 Delivery Conditions
In addition to checking in accordance with the order, the assembled switch cabinets shall go through
a delivery test in accordance with relevant provisions of IEC 298 so as to verify their correctness in
structure and function. VCB, bus bar, fasteners and accessories are packed separately.
4.2 Packaging
The packaging of switch cabinet may be adjusted according to the request of specific conditions, such as
navigation packaging or no packaging. Especially marine transport, the switch cabinet must be sealed
with plastic film bags even though it is packed in a container and appropriate desiccant shall be put into
the package to guard against damp.
4.3 Transportation
Generally, the transport unit is formed by a single switch cabinet. In exceptional cases, the transport unit
can be formed by a switch cabinet group or switch cabinets installed back-to-back.
Switch cabinets should be transported vertically. It is necessary to adopt relevant safety measures to
protect personnel and equipments. The loading work must be carried out only with the following tools:
➢
Forklift or manual hydraulic car.
4.4 Delivery and Intermediate Storage
The consignee is supposed to (but not limited to) carry out the following duties when the switch cabinet
arrives at the scene:
➢
Open the box to perform acceptance inspection and check whether the spare parts are complete
as listed on the packing list.
➢
Check whether the delivered goods are complete and free from damage. Check whether the
labels, conformity certificates are complete and whether there is an instruction manual. If there
is any doubt, please open the box and check. In case of intermediate storage, some desiccants
shall be put in and reseal the box.
➢
Make a detailed record for any shortages, defects or transportation damages and inform related
authorities in time.
Please note that the goods for intermediate storage should be placed at locations without any
damage to switch cabinets and installation materials.
➢
The storeroom shall be dry and well ventilated.
➢
The room temperature shall not be lower than -25°C.
➢
No other hazardous environmental impact shall exist.
➢
The switch cabinet shall be stored vertically.
➢
The switch cabinet cannot be piled up.
➢
The package shall not be removed or damaged.
➢
Un-packaged switch cabinets shall be loosely covered with plastic films to guard against stains.
Good ventilation must be maintained for corrosion protection.
➢
Check the condensation regularly on time before installation.
Standard Operating Instructions (2-Incoming VCB Panel with 1 VCB Panel as Coupler)
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5. Filed Installation of Switch Cabinet
®
Lauritz Knudsen Electric
Denmark Technology
Since 1893
In order to guarantee correct installation sequence and highest installation quality, the field installation of
switch cabinet shall be carried out by specially trained technicians or you may entrust our company to send
engineers for field guidance and supervision.
5.1 General Requirements for Installation Site
Civil engineering in the distribution room should be equipped with lighting and power supply for
installation and ventilation devices after project completion and passing through acceptance inspection.
The distribution room should be dry, clean, well-ventilated and the doors can be closed. Necessary
preparative works such as wall-through hole, cable trench, etc. shall be done in advance. Cable trench
should be constructed according to specific requirements in each cable work area. The schematic
diagram 5/5 is for your reference. Reference the sketch map 5/5. The height of ceiling in distribution
room shall not be less than 3000 mm. Make sure to satisfy the indoor work conditions of switch cabinets
as stipulated in IEC, including the indoor temperature conditions.
5.2 Basic Plane Layout Scheme of Distribution Room
Considered in the way of double-face maintenance, LKE-VS switch cabinet sets aside appropriate
installation and maintenance channel between back cover board of switch cabinet and partition and
between both sides of switch cabinet and partition.
Channels of enough width should be set aside between the switch cabinet and wall in order to achieve
convenient installation, running and maintenance. If the switch cabinets are arranged face-to-face in two
rows, the distance of switch cabinets between two rows is advised to be not less than 2500 mm.
5.3 Foundation
It is relatively appropriate to install the switch cabinet on the foundation framework or elevated auxiliary
floor of distribution room floor. The laying of foundation shall conform to relevant regulations, especially
the allowable tolerance of straightness and flatness, which is a precondition for perfect installation of
switch cabinets. The construction of switch cabinet foundation must comply with relevant provisions in
electric power construction and technical specifications for acceptance inspection.
5.3.1 Floorboard of Distribution Room as the Foundation
When the amount of switch cabinets is small and the weight is relatively light, they can be directly
installed on the floor of distribution room. The floor of installation location shall be very flat and
with enough carrying capacity. If necessary, insert proper spacer under the switch cabinet while
installing and adjusting.
5.3.2 Foundation Frame (Figure 5/1) Installation on a Concrete Floor
As shown in Figure 5/1, the laying of switch cabinet foundation framework requires adopting
the method of secondary grouting and it shall be done after completion of civil construction.
The facture and laying of foundation framework is recommended to be carried out by a electric
installation unit. The foundation framework of specific project shall be based on the blueprint
drawn according to manufacturer requests.
At the time of civil construction, the basic elevation of switch cabinet should consider reserving
the height of foundation framework channel steel with a small margin as shown in Figure 5/3. The
pre-burial of anchorage steel plate shall follow the direction of framework width with internals at
1m to 5 m.
10
Standard Operating Instructions (2-Incoming VCB Panel with 1 VCB Panel as Coupler)
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5. Filed Installation of Switch Cabinet
®
Lauritz Knudsen Electric
(cont’d)
Denmark Technology
Since 1893
The foundation framework is a frame structure made up of channel steel and angle steel welding.
As for the basic dimension requirements for framework, please refer to Figure 5/3. No mandatory
requirement is set on the height of channel steel and No. [5 or No. [8 channel steel can be
adopted. The edgewise of longitudinal channel steel on foundation framework shall be consistent
with the dimension of switch cabinet body framework.
After civil construction is completed, the electric installation unit shall carry out foundation framework
installation over the manufactured foundation framework by placing it on the foundation plane.
Adjust it with steel shim. Calibrate the framework dimensions on horizontal and vertical direction
with steel band tape and gradienter. The horizontal error shall be no more than 1 mm and the total
error shall be no more than 3 mm. Top surface of foundation framework should be 3 mm to 5 mm
higher than the final floor elevation. Framework elevation is not allowed to be lower than final floor
elevation. After calibration, both the framework and adjusting steel shim shall be welded onto the
pre-buried anchorage steel plate. The final step is to perform secondary grouting so at to finish the
pre-burial of foundation framework as shown in Figure 5/1 and 5/3. During the installation stage,
the foundation framework should not be impacted or pressed. Necessary acceptance inspection
procedures must be done before foundation framework anchoring and secondary grouting.
5.4 Field Installation
Using standard bolts with their strength grade no less than 8.8 and the corresponding tightening torques
are as follows:
Bolt
6
8
10
12
Tightening torque
10
25
50
85
Note: No lubricating oil shall be applied.
Send the switch cabinet to preliminary installation position according to its arrangement diagram.
After the switch cabinets are all connected together, fix it on the foundation framework with foot screws
or by welding. Move the switch cabinet to foundation framework, adjust related dimensions on horizontal
and vertical direction and then joint two switch cabinets together. The jointing procedures are as follows:
Cabinet joint is to connect the left and right switch cabinets together with bolts. It is only necessary to
align the two switch cabinets at the time of field installation. Introduce the bolt from the left of switch
cabinet through the joint hole and fix it onto the adjacent cabinet with a nut. Firstly, put 10 bolts in place,
screw in the nut by hand and then fasten them with a wrench one by one. It is easy to operate.
Repeat the above said procedures to joint all switch cabinets one after another. At last, install all back
cover boards and control cable trough cover boards back to their home positions.
➢
Clean the bus bar with clean and dry soft cloth. Check whether there is any damage on insulation.
Clean grease and attached dirt in accordance with Section 7.2.
➢
Check all the accessories used in bus bar installation before installing bus bar.
➢
Please note: while jointing switch cabinets with different width, the length of three phase bus bars
is different. Please take special notice while checking bus bars!
➢
Before installing the main bus bar, the board at the back of switch cabinet shall be removed.
Please keep these boards and screws properly.
➢
The connection of branch bus bar and main bus bar should apply hexagon bolts with high strength.
➢
Generally, the installation of main bus bar starts from the left-most switch cabinet and connection
is done toward right one after another. Firstly, install the bus bars with the lowest phase one by
one, set bolts, washers and nuts in place and fasten them by hand. When the bus bars with the
lowest phase are all installed in place, tighten each bolt in sequence with a bushing wrench and a
torque wrench. The tightening torque of main bus bar bolt is 50 Nm. It is recommended to make
marks on the bolts after checking with a torque wrench so as to avoid omission.
Standard Operating Instructions (2-Incoming VCB Panel with 1 VCB Panel as Coupler)
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5. Filed Installation of Switch Cabinet
®
(cont’d)
Lauritz Knudsen Electric
Denmark Technology
Since 1893
5.5 Connection of Power Cables and Control Cables
The connection of cables must be done according to the local cable construction area. The following
procedures are for your reference.
➢
Lead in power cables and strip off at the predetermined length.
➢
Install the connection terminals according to the instruction manual of manufacturer.
➢
Open circular holes of proper dimension on damping seal rings based on the diameter of cable
cores.
➢
Lead the cable through bottom board and damping seal ring, connect the terminal, insert the
heat-shrinkable tube and connect it to the cable connection point. Heat the heat-shrinkable tube
to make it shrink and cover the exposed part of the cable core.
➢
Install the bottom board, cover the damping seal ring securely and clamp the cable with a cable
clamp tightly.
➢
Send the control cable into the Low-voltage compartment.
➢
Strip off the cable box and fasten the cable on the top of cable trough. Rotate the frame of terminal
board upward and lead the control cable core into Low-voltage compartment A.
➢
Connect the control line to the corresponding terminal on terminal board according to the wiring
diagram.
➢
Lead the control line to the adjacent switch cabinet via the through-hole at the left and right of
Low-voltage compartment.
5.6 Connection of Ground Copper Bar
➢
Connect the ground copper bars of adjacent switch cabinets and make them form into a unified
Earthing main bus bar. At the time of switch cabinet delivery, the short connection copper bar used
for interconnection has already been fixed at the right of main ground copper bar temporarily.
The interconnection copper bar shall be removed at installation, lead it through the oblong hole
reserved between cabinets and fix it on main ground copper bar between two adjacent cabinets.
The connection of the switch cabinet main Earthing main bus bar with distribution room Earthing
grid can be realized by connecting cables. The Earthing cable shall be introduced from the
control cable reserved hole of switch cabinet and be connected with ground copper bar through
connection terminals.
5.7 End of Installation Work
12
➢
Check whether the paint on switch cabinet is damaged or not. If so, it must be repaired (see
Section 7.3.1).
➢
Check bolt connection, especially the bus bar at field installation and bolt of Earthing system.
They must be all tightened.
➢
Clean the switch cabinet carefully.
➢
Reinstall the cover board removed during installation and wiring.
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5. Filed Installation of Switch Cabinet
®
(cont’d)
Lauritz Knudsen Electric
Denmark Technology
Since 1893
➢
Insert the circuit breaker truck into the switch cabinet: take the circuit breaker truck out of the
package box, and place it on the maintenance cart, pull the handle on the circuit breaker truck
inward to withdraw the positioning pin, and correctly position the circuit breaker truck before
leaving the handle so that the circuit breaker truck is locked on the maintenance cart; push the
maintenance cart to the cabinet but do not directly push the circuit breaker truck. The maintenance
cart must be pushed slowly with care to prevent that the circuit breaker truck is vibrated or collapsed
by any barrier, tongued or grooved point on the floor. Further adjust the working platform to a
suitable height by adjusting the four adjusting wheels on the maintenance cart, align the hole to
the positioning pin, and insert the maintenance cart into the cabinet and lock it. Hold the handle
of circuit breaker truck by both hands, pull it inward to fix the positioning pin, and meanwhile push
the circuit breaker truck into the cabinet, leave the handle after it is positioned correctly, and then
lock the circuit breaker truck on the cabinet. Hold the locking handle at the front of maintenance
cart, pull it leftward to detach it from the cabinet, and then move the maintenance cart away.
➢
Check whether the interlocking devices are flexible or not. Re-apply lubricant where necessary.
Figure 5/1 Typical sectional layout diagram of distribution room
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5. Filed Installation of Switch Cabinet
®
(cont’d)
Lauritz Knudsen Electric
Denmark Technology
Since 1893
Figure 5/2 Dimension of bottom mounting hole with a cabinet width of 650 mm
Figure 5/3 Foundation framework of a cabinet width of 650 mm
14
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6. Operation of Switch Cabinet
®
Lauritz Knudsen Electric
Denmark Technology
Since 1893
The relevant running and operation procedures shall be performed only by trained technicians who know
well of switch cabinets, attach great importance to related standards and requirements of IEC, other
safety regulations ruled by specialized agencies and local authorities, work regulations and operational
instructions.
6.1 Start-up
6.1.1 Preparation
The following work shall be done before turning on the high-voltage power supply:
➢
The technique data marked on the switch cabinet nameplate shall be carefully checked to
agree with the technique data required by running electric power system.
➢
Check elements such as circuit breaker, removable units, insulating parts, etc.
➢
Check whether the connection of the main Earthing bus bar and the Earthing conductor of
the transformer substation outside the cabinet is reliable.
➢
Check whether the surface paint is damaged. If so, repair it according to the guidance in
Section 7.3.
➢
Remove all the surplus materials, irrelevant objects and tools inside the cabinet.
➢
Clean the switch cabinet, insulating parts and the sealing strip inside the cabinet door
with clean and dry soft cloth free from waste silk. Remove the adhesive dirt and grease
according to Section 7.2.
➢
Check mechanical and electrical interlocking validity without exerting a force.
➢
Adjust the protective device of switch cabinet and test its function by using test equipment.
➢
Offer trainings to local operators in terms of basic details on normal operation of the switch
cabinet.
➢
Check the switch status of running preparations and device electrical system.
➢
According to the regulations on responsibility, it might be necessary to check the following
devices near the switch cabinet: power cable, auxiliary cable, auxiliary power supply, distant
control system, Earthing system, distribution room device, distribution room status, etc.
6.1.2 Start-up
➢
Turn up the heater 48-hour in advance according to the regulations of service conditions.
➢
Comply with all relevant safety regulations. Ensure that the circuit-breakers and load
switches inside cabinet are in the OFF position.
➢
Dismantle the Earthing lines and shorting stubs within the dangerous work area.
➢
Energize the feeder cables.
➢
Energize the switch cabinet based on normal procedures and observe the signal and
indicator.
➢
The phase sequence should be checked when there are several inlet-lines and several
switch cabinet groups. (see Section 6.3.2).
➢
Carry out all measurements and check all functions by making use of the high-voltage
power supply energized.
➢
Pay attention to all abnormal conditions.
Standard Operating Instructions (2-Incoming VCB Panel with 1 VCB Panel as Coupler)
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6. Operation of Switch Cabinet
®
(cont’d)
Lauritz Knudsen Electric
Denmark Technology
Since 1893
6.2 Operation of Switch Cabinet
All operations shall be performed when the switch cabinet doors are closed.
6.2.1 Circuit Breaker Truck
Manually insert the truck from test/isolation position to running position.
➢
Insert the control line plug into control line socket.
➢
Make sure that the circuit breaker is in the OFF position (switched off if it is not in the OFF
position).
➢
Insert the handle into the socket of the lead screw mechanism.
➢
Turn the lever clockwise until it reaches the end (about 20 turns). At this time, the truck is
in operation position.
➢
Observe the position indicator.
➢
Draw out the handle without turning to prevent the truck from moving out and circuit-breaker
from out of proper position which could affect indication and control.
Notes:
The truck is not allowed to stay at any intermediate places between the running position and the
test/isolation position.
Manually remove the truck from the running position to the test/isolation position. Operate
reversely to move into running position.
6.2.2 Circuit Breaker
For detailed operation instructions, please refer to the operation instructions of circuit breaker.
Spring energy storage
➢
The energy storage process can be completed automatically in terms of circuit breakers
equipped with charging motor. If the charging motor is broken, manual charging shall be
performed.
➢
In terms of circuit breakers equipped with a manual charging unit, insert the charging lever
into socket, turn it clockwise until the charging status is displayed. When the charging
status is reached, charging mechanism will trip automatically and the charging lever can
not be turned any longer.
OFF (Opening) and ON (Closing) of circuit breaker
Operate local or distant control button and observe the indicator of circuit breaker off and on.
The counter for number of operations will add 1 automatically after each cycle of circuit breaker
operation.
Refer to Table 2 for the correspondence between operation procedures and charging status.
16
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6. Operation of Switch Cabinet
®
Lauritz Knudsen Electric
(cont’d)
Denmark Technology
Since 1893
Examples of charging status indicator
DISCHARGED
DISCHARGED
CHARGED
Discharged
CHARGED
Charged
Table 2 Correspondence between operation procedures and charging status
The truck is in the running position in terms of circuit breakers equipped with electric charging
mechanism.
Operation procedures
(Switch cabinet door is closed)
Operation results
Charging status
Circuit breaker position
DISCHARGED
Start charging motor
CHARGED
DISCHARGED
DISCHARGED
Automatic charging
Closing of circuit breaker
CHARGED
CHARGED
Automatic re-charging
DISCHARGED
DISCHARGED
CHARGED
CHARGED
DISCHARGED
Opening of circuit breaker
DISCHARGED
CHARGED
CHARGED
Carry out mechanical operation test of circuit breaker only when the truck is in test position
(plug in the control line plug).
6.2.3 Earthing Switch
There is a quick closing mechanism on the Earthing switch.
The Earthing switch can only be operated only when the truck is in test/isolation position. The
opening and closing of Earthing switch is allowed only when the switch cabinet door is closed and
in the unlocked status.
Manual opening and closing
➢
Press the sliding plate to the handle hole bottom of Earthing switch. (When the Earthing
switch is closed, then it is already in this position.)
➢
Insert the operating lever of Earthing switch.
➢
Turn the lever clockwise to close Earthing switch; turn the lever counterclockwise to open
Earthing switch. The turn angle is approximately 180° and the action should be linked up
while turning.
➢
Observe the mechanical/electrical position indicator of Earthing switch.
Remove the lever. The sliding plate remains in opening position when the Earthing switch is
closed.
Standard Operating Instructions (2-Incoming VCB Panel with 1 VCB Panel as Coupler)
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6. Operation of Switch Cabinet
®
(cont’d)
Lauritz Knudsen Electric
Denmark Technology
Since 1893
6.2.4 Door of Cable Compartment
In case that the cable compartment door is installed with a mechanical or electrical forced locking
device, the door can be opened only when the Earthing switch is closed. And only after the door
is closed can the Earthing switch be opened.
The operation procedures are as follows:
1.
Move the circuit-breaker truck to test position or out of the switch cabinet.
2.
Turn the Earthing switch to closing position.
3.
Open cable compartment door after releasing the door lock.
4.
Close cable compartment door after completing examination and repairing.
5.
Turn the Earthing switch to closing position.
6.
Push the circuit breaker truck to test position or operating position.
6.2.5 Electrical/Mechanical Indication/Monitoring (Figure 3/1)
While running the switch cabinet, observe all running data and status indicators within the
secondary area. Pay attention to all abnormal conditions.
18
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7. Maintenance
®
Lauritz Knudsen Electric
Denmark Technology
Since 1893
7.1 Overview
Maintenance is carried out for maintaining fault-free operation and achieving the longest service life of
switch cabinet. The following procedures shall be carried out.
Inspection——Confirmation of actual running status
Servicing——Measures to maintain the specified running status
Repairing——Measures to restore the specified running status
Notes:
Maintenance work can only be performed by fully trained technicians. They know well of switch cabinets,
attach great importance to IEC and other related safety regulations ruled by technical agencies and
other important guidance. It is recommended to contact our service staff for assistant process when the
switch cabinet needs repairing.
The inspection and servicing intervals (maintenance cycle) for some equipment/elements (e.g. wearout parts) are determined by running time, operation frequency and times of short-circuit fault, etc. The
maintenance cycles for other elements are determined by operation mode in specific situations, load
level and environmental effects (including pollution and corrosive air).
This instruction book and operation guide for circuit breakers and load switches provided must be
complied with in specific situations.
If necessary, more detailed information is available in the technical data of switch cabinet (e.g. special
working conditions).
7.2 Inspection and Maintenance
Inspection and servicing of the switch cabinet should be carried out every 2 to 5 years according to the
operation conditions and local environment.
Inspection shall include (but not limited to) the following:
➢
Isolate the working area according to IEC and safety regulations ruled by other agencies and
make sure the power source will not be switched on again.
➢
Inspect switching device, control, interlocking, protection, signal and functions of other devices.
➢
Check the surface condition of isolation contacts. Move away the truck, put up the valve and
visually inspect the contact. If the silver coating on contact surface is worn out and the copper
is exposed in air or the surface is severely corroded with injuries or overheating (discoloration)
traces, the contact shall be replaced.
➢
Check accessories and auxiliary equipments of switch and also the insulating board to keep them
dry and clean.
➢
The equipment surface is not allowed to have external discharge under running voltage. It can be
identified by noise, odor, glow, etc.
➢
Basic servicing and inspection are necessary work including the following contents:
The device shall be cleaned carefully if it is found to be dirty (In a tropical climate, salt, mould,
insect and condensation are all likely to cause pollution.), especially the surface of insulating
materials. Remove dust less adhesive with a dry and soft cloth. Immerse the soft cloth in a
mildly alkaline household cleaner, remove sticky/greasy dirt, wipe with clean water and then dry
it. In terms of insulating materials and elements severely polluted, clean them with halogenfree cleaners. Please obey the operation manual of manufacturer and related guidance of our
company for safety.
Standard Operating Instructions (2-Incoming VCB Panel with 1 VCB Panel as Coupler)
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7. Maintenance
®
(cont’d)
Lauritz Knudsen Electric
Denmark Technology
Since 1893
➢
* Trichloroethane, trichloroethylene or tetrachloromethane is prohibited.
➢
In case there is an external discharge, it often works to apply a layer silicon panniculus adiposus
on the discharge surface as temporary repairing. As for permanent solutions of these problems,
please consult our company.
➢
Check the bolt connection of bus bar and Earthing system for tightness and whether the functions
of isolating contact system are correct.
➢
Please add lubricating oil when there is insufficient lubrication or no lubrication between the truck
insert system mechanism and contact point.
➢
Add oil on sliding parts and bearing surfaces in the switch cabinet (e.g. valve, interlocking and
guiding system, lead screw mechanism, truck wheels, etc.). Otherwise, clean points which need
oil and add lubricating oil on them.
➢
Please obey the maintenance guidance in specific instruction manual of switch cabinet.
7.3 Repairing
7.3.1 General Repairing
➢
Repair immediately for any defections discovered.
➢
Clean up the rust on paint damaged area on steel plate and other steel-made components
through mechanical methods (such as copper brush). Lightly grind around the paint layer
to remove the greasy dirt, apply the anti-corrosive priming paint immediately and apply the
finish paint after the priming paint gets dry. Use compatible paint only.
➢
Clean the white rusty stain on surfaces of galvanized and chrome-plated functional
elements with a copper brush. Wipe off the rusty stain particles with dry and clean, soft
cloth free from waste silk. Clean up the greasy dirt and apply priming paint immediately
after installation and apply finish paint after the priming paint gets dry.
➢
Movable and rotatable parts (e.g. spindle and link rod) should not be painted but they shall
be applied with lubricants evenly.
7.3.2 Elements Replacement
Please contact our company for elements replacement. We will manage according to specific
conditions.
7.4 Spare Parts
Please clearly indicate the specifications of switch cabinet or circuit breaker when purchasing spare
parts.
20
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