Secogear
P/VII-12
AC metal-clad enclosed
switchgear
Secogear P/VII-12 AC metal-clad
enclosed switchgear
SecoGear P/VII-12 is the latest indoor electric distribution equipment produced by GE Energy – Industrial Solutions. It is a three-phase,
metal-clad, air insulated switchgear that is factory-assembled, type tested and suitable for indoor applications up to 12 kV and rated
current up to 4000A. It is designed, assembled and tested to meet or exceed applicable IEC standard.
SecoGear reliability is based on the usage of proven components including the SecoVac VB2 type high performance vacuum circuit
breaker. It incorporates the compartment concept with grounded metal barriers that segregate primary functions so that no live parts
are exposed. Safety Interlocks are standard, as are closed door racking and storage, breaker position indicator, and positively actuated
safety shutters.
Combining the time-honored advantages of General Electric metal-clad switchgear – flexibility, quality and economy – with vacuum
interrupter’s longer life, design simplicity and reduced maintenance, SecoGear is building its own tradition of superiority.
Applicable standards
IEC62271-200 AC metal-enclosed switchgear and controlgear for rated voltages above 1 kV and up to and including 52 kV
Environmental data
Max ambient temperature +400C.
Min ambient temperature -150C.
Mean ambient temperature within 24h not more than 350C.
Maximum average relative humidity:
Over 24 hour period 95%
Over 1 month period 90%
Saturated steam pressure:
Daily average: <2.2kPa
Monthly average: <1.8kPa
Altitude category does not exceed 1000m
Earthquake intensity no more than 8 degree
Site free from fire/explosion, severe contamination, corrosion and
violent shock and ambient air is not polluted obviously by dust.
Note: when the relative humidity is above 70%, the heater shall be
put into use for preventing condensation.
When the normal service condition is different from the above
mentioned, please confer with us.
1
Structure
The rails for the breaker are assembled in the middle of the cubicle / breaker compartment. This is more advantageous for the easy
operation. This design also provides sufficient space to access the power cable termination and maintenance.
The switchgears can be arranged face to face but cannot be installed against wall.
Height (a)
Rated breaking current ≤31.5A
Rated current of branched
busbar≤1250A
Width (b)
Construction of Secogear P/VII-12 for cable incoming and feeder
Rated breaking current:40kA
Rated current of branched
busbar≤1250A
Rated breaking current:40kA
Rated current of branched
busbar>1250A
Depth of the
frame
Depth of the
rear cover
plate(d)
mm
2200
mm
650
800
mm
840
mm
1000
mm
1550
1590*
mm
30
*Only for the structure 650mm in width ;
Once there is a switchgear with 650mm in width, the depth of the other cubicles will change accordingly.
When cables come in switchgear from the top, then should add rear channel cabinet with 200mm depth. When the busbars come in from the top,
should add rear channel cabinet with 350mm.
A. Busbar compartment
B. Truck compartment
C. Cable compartment
D. LV compartment
1. Pressure relief flap
2. Enclosure
3. Removable partition
4. Branch busbar
5. Main busbar
6. Fixed contact
7. Bushing spout
8. Current transformer
9. Earthing switch
10. Cable sealing terminal box
11. Arrestor
12. Bottom plate
13. Secondary terminal box
14. Removable partiton
15. Secondary terminal panel
16. Shutter
17. Secondary plug
18. Vacuum circuit breaker
19. Earthing for moving truck
20. Racking mechanism
21. Earthing switch operation mechanism
22. Control cable duct
23. Main earthing busbar
2
The enclosure and partition
The enclosure of the switchgear is made of folded high quality steel plates connected with fasteners. The assembled switchgear has
integrity in dimension. The cubicle is divided into circuit breaker compartment, busbar compartment, cable compartment and LV
compartment by metal partitions. Each function unit is separated from others.
Circuit breaker compartment
The CB compartment is located in the front of the cubicle. Rails
are provided on both sides of the compartment for the breaker
to move between the test and service positions.
Bushing type CT or bushing spouts and protective metallic
shutters are provided in the breaker compartment. The shutters
open automatically when the breaker moves from test position
to service position. The protective shutters cover the fixed
contacts when the breaker moves from service position to test
position thereby protecting personnel from coming in contact
with the live parts.
The rack in / rack out operation of the breaker can be carried
out with the door of the cubicle closed. The position of the
breaker truck can be viewed through the window on the door.
Withdrawable parts
Based on the purposes, the withdrawable parts can be
classified as circuit breaker truck, PT truck, link truck, metering
truck and etc. The same truck can be interchangeable easily.
The primary arms installed on each phase are all equipped with
spring fingers.
Trucks can be in test and servicing positions, each of which has
a locating device to ensure the trucks is allowed being operated
only when they are at the proper positions.
Before the truck is moved, the breaker should be in open.
Busbar compartment
Located at upper rear part of the cabinet is the Busbar
compartment . Main busbars can be led from one cubicle
to another. The bushings installed on the partition not only
support the main busbar but also prevent the faulty spreading
to the adjacent cubicle. Branched busbar can be connected to
the main busbar and bushing spout with bolts.
All busbars can be covered with heat-shinkable tubings
according to customer' s special requirements.
The busbar joints can also be covered with insulation boot.
3
Cable compartment
Pressure-relief
The lower rear of the cubicle is cable compartment, in which
current transformer, earthing switch and arresters can be
installed.
With the rear cover plate removed, the operator can enter the
cubicle to install cables. 1 or 3 cables can be connected to the
terminal in parallel at the same time. The height of the cable
terminals can reach 680mm. In the bottom of the compartment
there is removable steel plate as well as cable clips and seal
rings with variable radius.
In addition, heaters are set in both truck compartment and
cable compartment to prevent condensation caused by high
ambient humidity.
All the truck compartments, busbar compartment and cable
compartment have pressure relief duct.
In the case that internal arc fault occurs to the truck, busbar
or cable compartments, the pressure inside the compartment
rise. The pressure-relief plate will be opened automatically to
release pressure and gas. At this time because the seal ring
installed on the door is enclosed, the safety of the operators in
front of the panel is guaranteed.
LV compartment
LV compartment is on the upper front of the cubicle.
The secondary instruments such as the metering instruments,
operating switch, buttons and relays, etc, can be installed.
There are some little holes on the side plate of the compartment
for wirings.
Earthing device
There are fixed earthing contacts on both sides of the truck
compartment , and there are moveable earthing contacts
installed on both sides of the truck to ensure that the truck be
earthed reliably from the test position to servicing positon. The
earthing resistance is less than 300 μΩ.
After the cubicle is arranged properly, earthing busbar of
cubicles be connected and be connected to the earth.
Interlocks
Perfect and reliable interlocks facilities are incorporated to
ensure safe operation. These include the following:
a. Only when earthing switch is in open (at this time the rear
cover can’t be open), the truck can be racked in from test
position to servicing position.
b. Only when the breaker is in open, the truck can be racked
between the test position and servicing position in cubicle.
c. When the earthing switch is closed (at this time the rear
cover can be open), the truck can’t be racked in from the test
position to serving position.
d. When the rear cover is open, the earthing switch can’t be
open .
e. The earthing switch can be closed, only when the breaker
truck is on test position or outside the cubicle.
f. When the truck is on servicing position, the secondary plug
will be locked and can’t be removed.
g. Only when the breaker truck is on test position or servicing
positon, the breaker can carry out opening and closing
operation.
h. All the doors of HV compartments are equipped with locks
and be opened or closed with special tools.
Note: It is allowed to use capacitive voltage detection system.
4
Technical data for switchgear
Rated insulation level
Description
Unit
Data
Rated voltage
kV
3.6,7.2,12
1min Power frequency withstand voltage
kV
42
Lightning impulse voltage (peak)
kV
75
Rated frequency
Hz
50
Rated current of main busbar
A
800,1250,1600,2000,2500,3150,4000
Rated current of branch busbar
A
800,1250,1600,2000,2500,3150,4000
(forcing cooling for 4000A)
Short-time withstand current (4s)
kA
26.3,31.5,40
Rated peak withstand current
kA
66,80,100 (125)
Degree of protection
Enclosure IP4X, IP2X (if the truck compartment door is open)
Technical data for Secovac VB2 circuit breakers
Description
Unit
Data
Rated voltage
kV
3.6,7.2,12
1min power frequency withstand voltage
kV
42
Lightning impulse voltage (peak)
kV
75
Rated frequency
Hz
50
Rated current
A
800,1250,1600,2000,2500,3150,4000*
(forced cooling in panel)
Short-time withstand current (4s)
kA
26.3,31.5,40
Rated insulation level
Rated peak withstand current (peak value)
kA
66,80,100 (125)
Times of rated short-circuit current breaking
Times
50,30 (breaking current 40kA)
Operation sequence
Open-0.3s-close-open-180s-close-open
Mechanical service life
Times
20000
Contact stroke
mm
9±1
Over-travel
mm
5±1
Average closing speed
m/s
0.5~1
Average opening speed
m/s
1~1.3
Contact closing bouncing time
ms
≤2
Three-phase contact close and open asynchronization
ms
≤2
Technical data for spring operation mechanism of
Secovac VB2-12 circuit breaker
Technical data for energy charging motor
Description
Unit
Data
Rated working voltage (Un)
V
The rated input power of motor
W
AC/DC110
300
Charging time under rated working voltage
S
≤10
Normal working voltage scope
AC/DC220
85%~110%Un
Technical data for closing and opening electric magnet coils
Description
Unit
Rated working voltage
V
Normal working voltage scope
* on request
5
Data
DC24
DC110
Closing: 85%-110%Un
Breaking: 65%-120%, when <30%Un, breaking is not allowed
DC220
6
35
A2
S11
S22
A1
S21
S10
25
34
14
22
S41
13
21
24
14
14
41
36
22
S14
13 21
22
S42
13
21
26
Secondary components of circuit breakers
HK
58-pin aviation plug
M
Energy storage motor
V1, V2
Rectifier
S10, S11, S12
Energy storage position switch
S21, S22
Energy storage position switch
S41, S42
Energy storage position switch
HQ
Closing coil
TQ
Opening coil
GT1
Over current tripping coil
GT2
Over current tripping coil
GT3
Over current trip coil
DL
Auxiliary switch
HK
Hk
A~
HQ
A2
4
D~
V2 A~
C+
B-
42
1
A1
GT1
TQ
2
A2
32
Secondary components on trucks
S8
Limit switch (test position)
S9
Limit switch (servicing position)
X02
Wiring terminals of the truck
14
D~
V1 A~
C+
B-
30
46
1
GT3
2
45
13
12
11
3
14 22
13 21
31
Test position
Servicing position
44
1
GT2
2
43
S9
S8
15
24
23
5
14
13
HK
X02
X02
21 22
34 32
33 31
11
24
3
14
50 51
27
17 37
54 52
53 51
7
12
11
34
33
14
13
6
44
43
7
44
43
54
53
18
17
20 48 40
16
15
9
54
53
8
10 47 49
18 38 39
64 62 72
58 56 2
34
33
5
4
28 29
63 61 71
8
53 54 57 55 1
23
10
24
23
HK
16 33
44 42
13
2
1
23
43 43
6
19
74
DL
73
9
Transportation and storage
During the transportation and storage of the switchgear, the following should be noted:
(1) Don' t tilt, collide and upside down or violent shake.
(2) Prevent it from rain and dampness.
Don' t remove the electric components randomly so as to keep the integrity of the product.
Order
When ordering, customers shall provide the following documents:
(1) Primary circuit scheme and the single line system drawing.
(2) The array diagram of the switchgears and arrangement diagram of the station.
(3) The specification and quantity of the electrical equipment installed in each switchgear with the list of equipments.
(4) The secondary circuit diagrams.
Documents and accessories
For this product, the following documents and accessories will be provided:
(1) Product certificate.
(2) Product manual.
(3) Array diagram and secondary wiring.
(4) The operation handle of breaker, earthing switch and energy storage.
(5) Proper number of special lifting trucks for circuit breakers.
Installation foundation
Benchmark in front
of the cubicle door
80
Secondary cable chute
1450
1430
1415
300
40
600
460
60
1610
Normal panel 1650 (Including front door and rear cover)
Concrete
supplement layer
The construction of the foundation ground shall conform to the local specifications for electric power construction and acceptance.
The allowable error of the channel steel, frame structure shall not be greater than 1mm/m. the total length variation: ±3mm.
Structure reference of foundation frame is shown in figure 1 & figure2.
The foundation of switchgear is formed by pouring concrete in twice, once pouring the installation foundation, the second time,
supplement concrete on the surface. The thickness shall be 60mm in normal; the supplemented height shall be lower than channel
steel 1-3mm.
1200
1~3 mm
60
30
Channel steal 63×40×4.8
Primary cable chute
Figure 1: cable chute sketch
Note: Red figures in the diagram show the sizes when the cubicle' s width is 650mm.
7
n¡Á600(800)
450(800)
200
600(800)
450(800)
200
100
Foundational channel steel
63¡Á40¡Á4.8
B
1000*
600
480
1370
1385
1530
A
75
45
B
75
45
Double arrays 2000
75
45
800(1000)
650(1000)
n¡Á800(1000)
650(1000)
800(1000)
650(1000)
800(1000)
650(1000)
80*
75
45
140
110
200
A
40
740
1610
1650
Normal panel (including the front door and rear seal plate)
600(800)
450(800)
200
Primary cable hole
Single array 1500
Benchmark of the front door of the panel
600(800)
450(800)
100
1000*
Secondary cable hole
dismensions in mm
Min. size
A-A
800(1000)
650(1000)
80*
75
800(1000)
650(1000)
75
800(1000)
650(1000)
600(800)
450(800)
200
200
Denchmark of the front door of the panel
n¡Á600(800)
450(800)
200
1000*
600(800)
450(800)
B-B
1610
1650
Single array 1500
1000*
1450
(80)
60*
Double arrays 2500
800(1000)
650(1000)
1~3
200
600
460
1370
1395
100
Note:The red letters in the diagram show the sizes when there is panel with width of 650mm in the array.
Figure 2 Reference structure of concrete ground foundation frame
8
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