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
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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
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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