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XGN-12(HT-safe) box type fixed AC metal-enclosed switchgear
XGN-12(HT-safe) box type fixed AC metal-enclosed switchgear is suitable for a power system of three-phase AC 50HZ, rated voltage 3.6-12KV. It is a sulfur hexafluoride (SF6) all-insulated loop network cabinet and its high voltage live part is totally enclosed in the sulfur hexafluoride box. With small volume, high safety, easy operation, maintenance-free, etc., it is widely used in the fields of real estate, industrial and mining enterprises, and urban grid reconstruction etc, and is especially suitable for a high-voltage distribution systems of high humidity, high dust and other severe environments. In addition, in the high voltage distribution network field, the sulfur hexafluoride (SF6) fully-insulated loop network cabinet is wildly used in high-voltage cable branch box outdoor due to its high safety and maintenance free. The switchgear conforms to IEC60298, GB11022, GB3906, GB1984, GB3804 and other standards.
2. Environmental Conditions for Use
a. Altitude shall not exceed 1,000m ;
b. Ambient temperature: +40℃ - -35℃
c. Relative humidity: daily average value shall be no more than 95% and monthly average value shall be no more than 90%;
d. No frequent violent vibration.
3. Main Technical Parameters
3.1 Technical parameters of load switch cabinet (Unit C)
No.
|
Item
|
Unit
|
Parameters
| ||
1
|
Rated voltage
|
KV
|
12
| ||
2
|
Rated frequency
|
Hz
|
50
| ||
3
|
Rated current
|
A
|
630
| ||
4
|
Rated short-time power frequency withstand voltage
|
Voltage to earth, voltage between phases
|
KV
|
42
| |
Isolating fracture
|
48
| ||||
5
|
Rated lightning impulse withstand voltage
|
Voltage to earth, voltage between phases
|
KV
|
75
| |
Isolating fracture
|
85
| ||||
6
|
Rated short-time withstand current
|
Main circuit 4s
|
KA
|
20
| |
Earthing switch 4s
| |||||
Earthing connection circuit 2s
|
KA
|
17.4
| |||
7
|
Rated peak withstand current
|
Main circuit
|
KA
|
50
| |
Earthing switch
| |||||
Earthing connection circuit
|
KA
|
43.5
| |||
8
|
Rated short-circuit making current (peak)
|
Load switch
|
KA
|
50
| |
9
|
Rated active load breaking current of load switch (I1)
|
A
|
630
| ||
10
|
Rated closed loop breaking current of load switch (I
|
A
|
630
| ||
11
|
5% rated active load breaking current of load switch (5%I1)
|
A
|
31.5
| ||
12
|
Rated cable charging breaking current of load switch (I
|
A
|
10
| ||
13
|
Rated active load breaking times of load switch
|
Times
|
10
| ||
14
|
Rated earth fault breaking current (I
|
A
|
31.5（10次）
31.5(10 times)
| ||
15
|
Rated cable charging and circuit charging breaking current (I1) and breaking times in earth fault condition
|
A
|
17.3（10次）
17.3(10 times)
| ||
16
|
Mechanical life
|
Load switch
|
Times
|
5000
| |
17
|
Earthing switch
|
Times
|
2000
| ||
18
|
Rated pressure of SF6 gas (
|
MPa
|
0.045
| ||
19
|
Leakage rate of SF6 gas
|
Year
|
0.25/千分
0.25/1000 minutes
| ||
20
|
Protection level
|
IP67
IP3X; IP67 for SF6 gas room and fuse
| |||
3.2 Technical parameters of load switch-fuse combination electrical cabinet (Unit F)
No.
|
Item
|
Unit
|
Parameters
| |
1
|
Rated voltage
|
KV
|
12
| |
2
|
Rated frequency
|
Hz
|
50
| |
3
|
Rated current (main busbar)
|
A
|
630
| |
4
|
A
|
125
| ||
5
|
Rated short-time power frequency withstand voltage
|
Voltage to earth, voltage between phases
|
KV
|
42
|
Isolating fracture
|
48
| |||
6
|
Rated lightning impulse withstand voltage
|
Voltage to earth, voltage between phases
|
KV
|
75
|
Isolating fracture
|
85
| |||
7
|
Rated active load breaking current of load switch (I1)
|
A
|
630
| |
8
|
Rated breaking current of combination apparatus
|
A
|
31.5
| |
9
|
Rated transfer current of combination apparatus
|
A
|
1,750
| |
10
|
Mechanical life
|
Load switch
|
Times
|
5,000
|
11
|
Earthing switch
|
Times
|
2,000
| |
12
|
Rated pressure of SF6 gas (
|
MPa
|
0.045
| |
13
|
Leakage rate of SF6 gas
|
Year
|
0.25/千分
0.25/1000 minutes
| |
14
|
Protection level
|
IP3X,SF6 IP67
IP3X; IP67 for SF6 gas room and fuse
| ||
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