GE SecoGear User manual

24kV-27kV
Air Insulation Switchgear
User Manual
Gear
GE
Industrial Solutions

Index
General
Technical Specification
Enclosure design and equipment
Operations and trouble shooting
Inspection and Maintenance
Summary
Standard and Specification
Operating Conditions
Safety and Environment Protection Requirement
Handling and Storage
Installation of Switchgear
Technical specification for SecoGear Table 1
Technical specification for SecoVac VB2 Plus (Circuit breaker) Table 2
Main circuit resistance of SecoVac VB2 plus Table 3
Technical specification for Earthing switch Table 4
Resistance to internal arc faults (Optional)
Keylock (Optional)
Padlock (Optional)
Typical Modules (Figures 3/1)
Enclosure and Partitioning (Figure 3/2)
Switchgear Structure
Cable Connections
Operations and trouble shooting
Rack Circuit Breaker out from Service Position to Test / Disconnected Position
Circuit Breaker
Earthing Switch Operation
Interlocking of the Switchgear
Debugging of Combined Overcurrent Relay
Summary
Inspection and Maintenance Interval
Diagnosis and Trouble Shooting for Malfunction During Operations
Maintenance Item and Cycle
Routine Inspection
Service
Repairs
Inspection Items
Performance Test
2
7
11
16
21
2
2
3
3
4
6
7
7
7
8
8
8
10
11
11
12
15
16
17
18
18
19
20
21
21
22
22
22
23
24
24
24

Major Repairs and Examples
Spare Parts
Appendix A - Onsite Service Safety Instruction
Inspection and replacement of the main busbar
Inspection and replacement of the fixed contact and spout bushing
Inspection and replacement of the shutter mechanism
Replacing the earthing switch
Replacing the current transformer
Inspection and replacement of the surge arrester
Main Busbar
25
32
32
25
26
27
27
29
30
31

SecoGear 24kV-27kV Air Insulation Switchgear
1
Safety first!
Important Recommendations:
•Switchgear should be installed in a clean, dry, ventilated room.
•Switchgear and/or switchboards should be installed in closed rooms suitable for electrical equipment.
•Installation, operation and maintenance should be carried out by licensed electricians.
•Fully comply with the applicable standards (e.g. IEC), the utility connection requirements and the applicable safety regulations.
•Observe the relevant instructions in the instruction manual for all actions in relation to switchgear and switchboards.
•Pay attention to the hazard notes in the instruction manual marked with this warning symbol.
•Make sure that the specified data are not exceeded under switchgear or switchboard operating conditions.
•Keep the instruction manual accessible to all personnel involved in installation, operation and maintenance.
•The users must act responsibly in all matters affecting safety at work and correct handling of the switchgear.
Warning
•Always follow the instruction manual and respect the rules for good engineering practice!
•Hazardous voltage can cause electrical shocks and burns.
•Disconnect power, then earth and short-circuit before proceeding with any work on the equipment.
If you have any further questions about this instruction manual,
our field team will be pleased to provide the required information.
GE Energy reserve all rights to this publication. We do not accept
any responsibility for the information provided, which is subject to
alternation.

SecoGear 24kV-27kV Air Insulation Switchgear
2
General
Summary
This publication contains the information required for
installation, commissioning, operation and maintenance
of SecoGear. SecoGear is three-phase, metal enclosed, air-
insulated factory assembled switchgear. SecoGear is type-
tested and suitable for indoor applications up to 27 kV. The
panel is designed with withdrawable modules and is fitted with
a single busbar system. The withdrawable parts are equipped
with circuit breakers, voltage transformers, fuses or current
transformers.
Details of the technical design and configuration of individual
switchgear, such as the technical data, detailed part lists for the
individual panels and comprehensive circuit documentation etc.,
can be found in the relevant order documents.
For correct usage of the switchgear, please read this manual
carefully. It is always advisable to use the manual for all
operations regarding installation, commissioning, operation and
maintenance of SecoGear air-insulated switchgear.
These instructions are also used as references for personnel to
carry on regularly maintenance of the switchgear.
Standard and Specification
•SecoGear complies with the standards and specifications for factory-assembled, metal enclosed and type tested high voltage
switchgears to IEC publications as given below.
IEC62271-100: 2008 …………… High-voltage alternating current circuit breakers.
IEC62271-200: 2003 …………… AC Metal enclosed switchgear and control gear for rated voltages above
1kV and up to 52kV.
IEC62271-102: 2001 …………… High-voltage alternating current Disconnector and Earthing Switches.
IEC62271-1: 2007 …………… The common specification for high voltage switchgear and control gear
simple Standards
IEC60529:1989 …………… Degrees of protection as provided by enclosures (IP Code)
The switchgear has the following degrees of protection:
IP 4X applies for the enclosure and IP 2X applies for the partitions.
All other corresponding IEC publications, national or local safety regulations must be followed during the installation and operation of
the switchgear. In addition, any project specific advice from GE must be considered.

SecoGear 24kV-27kV Air Insulation Switchgear
3
Operating Conditions
Normal operating conditions
The switchgear is fundamentally designed for the normal service conditions for indoor switchgear to IEC Publication 62271-1:2007. The
following limitations apply. (If there are others we should detailthe limitations)
•Ambient temperature
- Maximum + 40℃
- 24h-Medium +35℃
- Minimum -15℃
•The maximum site altitude is 1000 m above sea level
•The intensity of earthquake should not exceed level 8
•Humidity
- Highest average value measured over 24 hours
o Relative humidity 95 %
- Highest average value measured over 1 month
o Relative humidity 90 %
Special operating conditions
SecoGear is suitable for operation in the climate of indoor
type according to IEC 62271-200 standard. Special operating
conditions must be discussed with the manufacturer in advance.
For example: At site altitudes above 1000 m, the effects of the
reduction in density of air on the dielectric properties must be
taken into account.
Increased ambient temperatures must be compensated for in
the design of the busbar and the branch conductors as well as
the withdrawable parts; otherwise the current carrying capacity
will be reduced. Fitting additional ventilation facilities can assist
heat dissipation in the switchgear panel.
Note on any special climatic operating conditions
When the switchgear is operated in areas with high humidity
and/or major rapid temperature fluctuations, there is a risk
of condensation. Preventive actions (e.g. applying an electric
heater) must be consulted with the manufacturer to avoid
condensation and any resulting corrosion or other adverse
effects. The control of the heaters depends on the particular
project are available.
Safety and Environment Protection Requirement
Safety Procedure
•Wear safety uniform according to electric safety regulations before entering the site
•Comply with industry work procedure. Power supply shall be operated by authorized staff.
Environment protection requirements
The manufacturer has a product recycle policy in accordance
with related law and ISO14001. Local laws shall be observed
when the switchgear is due for recycle.

SecoGear 24kV-27kV Air Insulation Switchgear
4
Handling and Storage
Condition on delivery
Packing
Transport
At the time of dispatch, the factory assembled SecoGear will
have withdrawable parts either securely locked in the service
position or packed separately, depending on the rating of the
equipment, transport mode and destination.
The SecoGear panels are verified in the factory for completeness
as per order requirement, and also passed routine testing as per
IEC 62271-200.
The busbars are not assembled, they are packed separately with
fasteners and accessories.
Based on the kind of transportation and country of destination,
the packing may vary. To protect against moisture a drying
agent bag is provided. IEC62271-1:2007 guidelines are followed.
•Panels with basic or no packing
•Panels with seaworthy or similar packing (including packing
for containerized shipments)
o Sealed in polyethylene sheeting
o Transport drying agent bags included
o Moisture indicator included
•Observe the directions for use of the drying agent bags. Note
the following
o Drying agent color observed blue indicates the packaged
equipment is dry condition
o Drying agent color observed pink indicates the packaging
contains moisture (relative humidity above 40%). Please
contact the manufacturer in this case before installation
The transport units normally comprise of individual panels and,
in exceptional cases, small groups of panels. The panels are
equipped with four (4) lifting eyebolts.
Only carry out loading operations when all precautionary
measures to protect personnel and materials have been taken,
with the following equipment:
•Crane of suitable capacity; the minimum capacity shall be 2
tonnes
•Fork-lift truck and/or manual trolley
•Lifting ropes/slings of appropriate load capacity with shackles
•Maintain an angle of at least 60°from the front for the ropes
leading to the crane hook (Figure 1/1)
HANG THE UNITS USING ALL 4 EYEBOLTS!
Figure 1/1: Handling by crane
(1) Lifting eyebolts (qty.4)

SecoGear 24kV-27kV Air Insulation Switchgear
5
Upon Receipt
The responsibilities of the consignee when the switchgear arrives at the site include, but are not limited to, the following:
Check the consignment is complete and without damage (e.g. look for any adverse effect caused by moisture). In case of doubt, the
packing must be opened and then properly resealed with new drying agent bags (when intermediate storage is necessary).
If any quantities are short, or defects or transport damage is noted, these must be;
•Documented on the respective shipping document
•Notified to the relevant carrier or forwarding agent immediately in accordance with the relative liability regulations
Note: Always take photographs to document any major damage.
Intermediate storage
Intermediate storage should follow the following practices to avoid any negative consequences:
Panels with basic packing or without packing
•A dry well-ventilated storeroom with a climate in accordance
with IEC62271-1:2007
•Store the panels upright
•Do not stack panels
Panels with basic packing;
•Open the packing, at least partially
Panels without packing;
•Loosely covered with polythene
•Ensure that there is sufficient air circulation
Check regularly for any condensation during storage.
Panels with seaworthy or similar packing with internal protective
covers
•Store the transport units
a. Protected from the weather
b. In a dry place
c. Safe from any damage
•Check the packing for damage
•Check the drying agent;
d. On arrival of the consignment
e. Subsequently at regular intervals
When the maximum storage period (starting from the date of packing) has been exceeded
•The protective function of the packing can no longer be guaranteed
•Take suitable action if intermediate storage needs to be continued
Warning
Do not walk on the top of the panels (due to rupture points in pressure
relief devices) ! The pressure relief devices can be damaged!

SecoGear 24kV-27kV Air Insulation Switchgear
6
Installation of Switchgear
In order to obtain an optimum installation sequence and ensure
high quality standards, site installation of the switchgear should
only be carried out by specially trained, or at least by supervised
personnel and monitored by responsible persons.
On commencement of installation on site, the switch-room
must be fundamentally finished, provided with lighting and the
electricity supply, lockable, dry and with facilities for ventilation.
It is also required that the basic frame and indoor ground
for the switchgear should be checked and accepted before
the construction. It must be ensure that the ceiling height is
sufficient for the opening travel of the pressure relief plates.
Tolerances for laying the floor frame are:
Evenness tolerance: ±1mm within a measuring length of 1m.
Straightness tolerance: 1mm per 1m, but not more than 3mm
over entire length of frame.
Cross section view of switchgear room layout (plan
view)
Switch room cable duct arrangement (Side elevation)
Detail of switchgear cable access cutout
Width Dimension
A 800 1000
B 600 800
C 595 692
290 800800
140
800 1900
70 1800 30
130
250
2400
Power Cable Duct 800*1000
3~5mm above ground
+5.0m
Figured steel plate (t=5mm)
Top Curface of basic frame
Strap of control cable duct
Control Cable Duct 250*250
Basic Frame
1200
300
A
190 130
1800
358
1700
B
4-15x20
54
Power Cable
Control Cable
144
600
1800
30 1800 70
800
Power Cable Duct
Basic Frame
150
1700
800/1000
800
1800
30 1800 70
800
Power Cable Duct
Basic Frame
150
1700
800/1000
Connection betweenSwitchgears
In order to connect the different switchgears together, here
use bolts of M8×35 to connect the panels together, the torque
requirement for the bolts is 26 N∙m, the connection points on the
switchgear is shown below.
Connection Points betweenSwitchgears
v

SecoGear 24kV-27kV Air Insulation Switchgear
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Technical Specification
Technical specification for SecoGear -Table 1
Rated voltage kV 24 27
Rated power frequency withstand voltage kV 50 65
Rated lightning impulse withstand voltage kVp 125 125
Rated frequency Hz 50/60
Rated current A 1250/2500
Rated short time withstand current(3s) kA 31.5
Rated peak withstand current1) kAp 82
Resistance uΩ
≤110 ( ≤1600A)
≤85 ( ≥2000A)
IP level for weather protection Enclosure IP4X
Between compartment IP2X
Technical specification for SecoVac VB2 Plus (Circuit breaker) -Table 2
Main circuit resistance of SecoVac VB2 plus -Table 3
Rated voltage kV 24 27
Rated power frequency withstand voltage kV 50 65
Rated lightning impulse withstand voltage kVp 125 125
Rated frequency Hz 50/60
Rated current A 1250/2500
Rated short-circuit breaking current: kA 31.5s
Percentage of DC component Up to 52%
Rated short-circuit closing current kAp 82
Rated short time withstand current kA 31.5
Rated peak value withstand current kAp 82
Rated duration time for short-circuit s 3
Opening Time ms 20 ～50
Closing Time ms 30 ～70
Rated auxiliary control voltage V 24*/30*/36/48/60/110/220 V DC 110/220 V AC
Operation sequence: O-0.3s-CO-15s-CO/ O-0.3s-CO-180s-CO
Mechanical life operations: Times 10000 (M 2)
Electrical Endurance Class E2
Single Capacitor Switching current A 400
*Consult with GE
Item Unit Value
Rated current A 1250 2500
Withdrawable µΩ≤45 ≤25

SecoGear 24kV-27kV Air Insulation Switchgear
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Technical specification for Earthing switch -Table 4
S/N Specification Unit Data
1 Rated voltage kV 24/27
2 Rated Work frequency withstand voltage (1min) in open condition of switch kV 65
3 Rated Lighting impulse withstand voltage (peak value) in open condition of switch kVp 125
4 Rated short-time withstand current (3s) kA 31.5
5 Rated peak value withstand current kAp 82
6 Rated short circuit making current kAp 82
7 Centre distance between phases mm 220/255
8 Electric endurance Class E1
9 Mechanical endurance Times 2000
Resistance to internal arc faults
Arc release
All three primary compartments of SecoGear switchgear are
provided with pressure relief flaps, which will automatically open
and guide the pressurized gas to the rear side direction if an
internal arc fault occurs in an affected compartment
The pressure relief protects damage to switchgear components
and the risk of injury to personnel, which may endanger an
operator or extend the arc fault effect to the entire switchgear
lineup. The relief flap is fixed by 3-M8 steel bolts and the other
side is fixed by plastic M6 screw, The M6 screw will be broken
and flap will open along weakness area( No bend area and part
with oblong holes) when pressure increase quick by internal arc
31.5kA/1s
Keylock (Optional)
The use of key interlocks is to realizing the interlocking logics between units of switchgear, Also the functional truck can be locked in
the racked-out position and the relevant lock key can only be removed with the functional truck in disconnect position. The earthing
switch closing and opening operations can be locked by means of keys. The latter can only be removed with the earthing switch in an
opposed position to the lock to be made.

SecoGear 24kV-27kV Air Insulation Switchgear
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Description of the interlock system Key Condition
Functional truck racking-in lock Key will be free when the truck in the disconnect position
Key will be trapped when the truck in the rack-in position
Earthing switch closing lock Key will be free when the Earthing switch is open
Key will trapped when the earthing switch in closed position
Earthing switch opening lock Key will be free when the Earthing switch closed
Key will trapped when the earthing switch in open position
Figure : Functional truck racking-in lock
Figure 2/5: Earthing switch in open position
Figure 2/6: Earthing switch in close position
Key lock is locked, key is free, Truck indisconnect position
Key lock can't be locked when truck in rack in position, and key is trapped
When earthing switch in open position, earthing switch can be locked by closing lock, the key of closing lock can be free. And opening
lock can't be locked, the key of opening lock is trapped.
When earthing switch in close position, earthing switch can be locked by opening lock, the key of opening lock can be free. And closing
lock can’t be locked, the key of closing lock is trapped.

SecoGear 24kV-27kV Air Insulation Switchgear
10
Padlock (Optional)
Padlock for Circuit breaker racking-in/out operation
Padlock for Circuit breaker racking-in/out operation will limit the access to insert crank lever to racking-in/out Circuit breaker. Racking-
in/out operation can be done only when lock cover is in the open position.
Figure 2/9: Padlock for Circuit breaker racking-in/out operation
Padlock for earthing switch operation
Padlock for earthing switch operation will limit the access to inserting the operation lever to operate earthing switch. Open/close
button can be operated only when the lock cover is in the open position.
Figure 2/8: Padlock for earthing switch operation

SecoGear 24kV-27kV Air Insulation Switchgear
11
Enclosure design and equipment
Typical modules (Figures 3/1)
With withdrawable type SecoVac VB2 Plus Vacuum
Circuit Breaker installed, SecoGear panels are used for
incoming or outgoing feeder. Each unit consists of three
high voltage compartments; Main bus bar, Circuit breaker,
Cable compartment and one Low voltage compartment for
instruments and auxiliary circuits.
For busbar sectionalizing, two panels are necessary, the
coupling panel with the withdrawable circuit breaker part and
a bus riser panel (available with busbar metering and earthing).
In equipment without busbar sectionalizing, a direct bar
connection between the individual panels will be provided.
Figure 3/1: Typical modules
Enclosure and partitioning
High quality 2mm thick Alu-Zinc steel sheets is used for the
external enclosure and internal partitions. Pressure relief
flaps are provided on the top of the panel for all high voltage
compartments. In case of overpressure due to internal arc
inside any of the compartments, these pressure relief flaps are
designed to open quickly to release the pressure. The pressure-
relief flaps are secured with steel screws on one side and
with plastic screws on the other side. In the case of internal
overpressure, the plastic screws are the point of rupture caused
by arc conditions. The top mounted pressure relief flaps on the
enclosure are made from mesh metal.
All compartments are accessible from the front, with their
own independent doors. The front doors can be opened up to
an angle of 130°and they are arc resistant. An inspection
window made of security glass is provided on circuit breaker
compartment door. The panel design provides an air gap
between two adjacent panels after panels are joined together.
•Figures of the panel (Refer to figure 3/2), the floor of the cable
compartment is fitted with removable non-magnetic metal
(13).
•The rear wall of the busbar compartment (3), intermediate
wall (14), mounting plate with shutters (16) and horizontal
partition (20) form part of the internal partitioning.
•The earthed internal partitioning ensures safe access to the
circuit breaker and cable compartment (C) even when the
busbars are energized.
•The low voltage compartment (D) is fully protected from the
high voltage area with the earthed steel-sheet casing.
•On the end sides of the switchgear, end cover plates are
provided for consistent appearance, as well as mechanical
and thermal strength in case of internal arc fault in the end
panel.
•Doors, rear walls and cover plates are treated against
corrosion and then coated with high quality paint. The doors
for circuit breaker and cable compartment are arc resistant
with a mechanical interlock.

SecoGear 24kV-27kV Air Insulation Switchgear
12
Switchgear structure
Figure 3/2: Typical feeder panel
A. Main bus compartment
B. Breaker compartment
C. Cable compartment
D. Low voltage compartment
1. Pressure relief plate
2. Enclosure
3. Cover of main busbar compartment (can be removed)
4. Branch busbar
5. Main busbar
6. Primary disconnect spouse
7. Primary disconnect
8. Current transformer
9. Earthing switch
10. Rear door interlock
11. Bottom plate
12. Partition between breaker compartment and busbar
compartment
13. Terminal block
14. Control plug
15. Shutter
16. Vacuum circuit breaker
17. Drive screw
18. Earthing switch operation mechanism
19. Control wire duct
20. Main earthing busbar
Figure 3/3: Incoming/feeder panel(1250/2500A) Figure 3/4: Incoming With fix VT panel (1250/2500A)
22
40
17
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
A
B
D
C
P30
P32
SCALE 1,000
10

SecoGear 24kV-27kV Air Insulation Switchgear
13
Figure 3/5: Busbar tie panel(1250/2500A) Figure 3/6: Riser panel(1250/2500A)
Figure 3/7: Measuring panel(1250/2500A) Figure 3/8: VT Panel (2500A)
P28
SCALE 1,000
10
A
B C
P29
A
B C
SCALE 1,000
P30
10
95.5
76
JSZV17-15R
15
P31
95.5
76
JSZV17-15R
15
P32

SecoGear 24kV-27kV Air Insulation Switchgear
14
Figure 3/9: Incoming with ES & VT panel (1250/2500A) Figure 3/10: Riser with ES panel (1250/2500)
Figure 3/11: CPT panel (2500A) Figure 3/12: Typical dimensions and Weights of SecoGear
(including withdrawable circuit-breaker parts)
Description
Dimension in
mm
27kV
Height A 2400
Width
Rated current of branch 1250A 31.5kA
B
800
VT
Rated current of branch 2500A 31.5kA 1000
Depth C 1800
Rated current Weight
A Kg
1250 800-1000
2500 1000-1200
P30
P31
P32

SecoGear 24kV-27kV Air Insulation Switchgear
15
Cable Connections
The cable compartment contains current transformers, voltage transformers (fixed or withdrawable), and earthing switch, depending
on the individual operating requirements.
The cable compartment is constructed for installation of three current transformers. When all the three current transformers are not
required, dummies can be installed in their place to maintain the same installation and connection procedures.
The fixed or withdrawable voltage transformers are connected with busbar on the primary side and fitted with HRC fuses. The earthing
switch can be operated manually, with position indication by mechanical indicator on the driveshaft and auxiliary switch. Three
lightning arrestors (optional) can be mounted in the space available.
Cable connection:
Rated voltage Panel width Max. number of parallel cables Max. cross section of cables Range of cable clamp Range of reducer ring
(kV) (mm ) per Phase (mm2) (mm) (mm)
27 800 6 630 35-54 27-62
1000 6
Figure 3/13: Cable compartment layout
NO. Parts Description
1 Cable clamp
2 Main earthing bar
3 Cable connection bar
4 Earthing Switch
1
2
3
4
This cover has been interlocked with the earthing
switch and can be opened only when the earthing
switch is in closed position
Earthing switch can be opened only when rear cover
is closed

SecoGear 24kV-27kV Air Insulation Switchgear
16
Operations and trouble shooting
Operations and trouble shooting
Before start up, the following work should be completed:
a. Check the overall condition of the switchgear and clear any
potential risk factor.
b. Check the switch，truck，isolated contactor and insulating
parts etc. by visual inspection.
c. Check the connection between earthing bus bar and
earthing conductor of the transformer substation outside the
compartment is secure.
d. Remove all of the remaining materials, unnecessary objects
and tools inside of the compartment.
e. Wipe the compartment body and the insulation parts with
a soft cloth that should be clean and dry. Then wipe offany
remaining dust and grease.
f. Clean the surface of earthing busbar. The earthing loop
resistance should be less than 350 micro-ohms.
g. Re-install the cover removed during the period of installation,
wiring and commissioning.
Warning
a. Comply with all relevant safety regulations
b. Maintain circuit breakers in disconnection position
c. Remove earth wires and short wires of the hazardous areas
d. Pay attention to any abnormal situations
Use of hand tools
1) Gear door lock key
drawing no: 5GD.253.008
2) Rack handle for truck
drawing no: Y-002
FIG 20 : Hand Tools
h. Remove the shipping cap on the pole of the circuit breaker.
i. When testing the power frequency withstand voltage of main
circuit, pay particular attention to sensors, cables and other
equipment during the test process.
Attention：Read the product manual carefully when testing
the VT withstand voltage; use a test voltage of appropriate
frequency to avoid core saturation.
j. Place the Circuit Breaker on auxiliary control power.
k. Perform the operation test of the circuit breaker by manual or
electric control; observe the corresponding position indicator.
l. Check the interlocking validity, both mechanical and electrical.
m.Conductive paste can be applied on the circuit breaker
primary contacts.
3) Earthing switch operation handle
drawing no: 5GD.253.144

SecoGear 24kV-27kV Air Insulation Switchgear
17
Rack Circuit Breaker out from service position to test / disconnected position
Move circuit breaker truck from transfer truck into the switchgear
a. Check the fixed primary contact and apply an adequate
amount of conductive paste. Check the interlocking
mechanism and apply lubricant on the moving parts to ensure
smooth operation.
b. Place the Circuit Breaker on transfer truck and put in lock
position. (See figure 4/1).
VCB locked on
the transfer truck
Figure 4/1: VCB truck on the transfer truck
Figure 4/2: Transfer truck lock
with switchgear
Figure 4/3: Lock VCB in
switchgear
Warning
The trolley has four (4) nuts for adjusting the platform, to
the same level of the breaker compartment.
c. Move the transfer truck to the front of the switchgear, turn
the adjusting nut to adjust the height of the transfer truck
platform, (See figure 4/2). Aim the guiding pin at the guiding
jack in front of the switchgear, push and make the transfer
truck engage with the switchgear by using the lock key. At
the same time, insert the front guide rail of the transfer truck
into the bottom guide rail groove of the switchgear truck. (See
figure 4/3).
d. Push the two sliding cranks inward under the truck to remove
the locked position with the transfer truck, and then push the
truck forward to make it enter the switchgear compartment
and lock it in the disconnect / test position. (See figure 4/4).
e. Operate the lock key releasing lever of the transfer truck to
Figure 4/4: Lock VCB in switchgear
remove the locked relation between the transfer truck and the
switchgear, and then remove the transfer truck.