10kV 11kV Medium Voltage vacuum switches manual withdrawable 12kV Vacuum Circuit breaker MV VCB
VCB-24 series solid-sealed indoor vacuum circuit breaker is an indoor high-voltage switchgear for three-phase power system with rated voltage of 24kV and frequency of 50 Hz. It is used as protection and control appliance due to vacuum circuit breaker. The special advantages are especially suitable for frequent operations requiring rated current or multiple short-circuit currents.
VCB-24 series solid-sealed indoor vacuum circuit breakers are fixedly mounted, mainly used for fixed switchgear. The circuit breaker can be used alone or in ring power supply, box transformer or various non- power supply system.
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NO |
Item |
Units |
Technicial parameters |
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|
1 |
Rated voltage |
KV |
24 |
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|
2 |
Rated short-duration power frequency withstand voltage |
65/79 (phase, ground/fracture) |
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|
3 |
Rated lightning impulse withstand voltage |
125/145 (phase, ground/fracture) |
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4 |
Rated frequency |
Hz |
50 |
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5 |
Rated current |
A |
630 1250 |
630 1250 1600 2000 2500 3150 |
630 1250 1600 2000 2500 3150 |
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6 |
Rated short-circuit breaking current |
KA |
20/25 |
31.5 |
40 |
|
7 |
Rated short-time withstand voltage |
20/25 |
31.5 |
40 |
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|
8 |
Rated short circuit duration |
S |
4 |
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|
9 |
Rated peak withstand current |
KA |
50/63 |
80 |
100 |
|
10 |
Rated short circuit closing current |
50/63 |
80 |
100 |
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|
11 |
Secondary circuit power frequency withstand voltage (1min) |
|
2000 |
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|
12 |
Rated single / back to back capacitor group breaking current |
A |
630/400(40kA:800/400) |
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|
13 |
Rated capacitor bank |
|
12.5 (frequency is not more than 1000Hz) |
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|
14 |
Mechanical life |
KA |
20000 |
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15 |
Rated current breaking times (electrical life) |
20000 |
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|
16 |
Rated short circuit current breaking times |
times |
50(40kA≤30) |
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|
17 |
Dynamic and static contacts allow wear cumulative thickness |
mm |
3 |
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|
18 |
Energy storage time |
s |
≤10 |
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|
19 |
Contact opening distance |
mm |
16±1 |
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20 |
Overtravel |
3.5±0.5 |
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21 |
Contact closing bounce time |
ms |
≤2(40kA≤3) |
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|
22 |
Three-phase split/closed period |
≤2 |
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23 |
Average opening speed (contacts are separated by -8mm) |
m/s |
1.5±0.2 |
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|
24 |
Average closing speed (8mm - contact closure) |
0.8±0.2 |
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|
25 |
Main conductive loop resistance |
μΩ |
≤50(630A)≤45(1250A) ≤40(1600,2000A)≤35(2500A) |
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|
26 |
Rated operation sequence |
|
0-0.3s-Co-180s-Co |
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