Product Definition
VZ4-12 vacuum circuit breaker is a kind of high-voltage electrical equipment used in power system, which has reliable insulation performance and efficient electrical disconnection function. As a high-voltage electrical appliance, the VZ4-12 type vacuum circuit breaker is suitable for AC 50Hz, rated voltage 12kV power system, used to control and protect the load in the circuit.
Scope of application and advantages
Its main advantages are small size, light weight, convenient operation, high reliability, and easy maintenance. In addition, it also has good durability and electrical performance, and can withstand abnormal conditions such as instantaneous overcurrent and short-circuit current to ensure the normal operation of the power system. In short, VZ4-12 vacuum circuit breaker is an efficient and reliable electrical equipment, widely used in electric power, metallurgy, petrochemical and other fields.
Main technical parameters of products
Serial Number |
Имя |
Unit |
Numerical |
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1 |
Rated voltage |
kV |
12 |
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2 |
Rated insulation level |
1min power frequency withstand voltage (effective value) |
42 |
||||
Lightning impulse withstand voltage (peak) |
75 |
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3 |
Rated short-circuit breaking current |
kA |
20 |
25 |
31.5 |
40 |
|
4 |
Rated current |
A |
630 1250 |
630 1250 1600 2000 2500 3150 |
630 1250 1600 2000 2500 3150 4000 |
||
5 |
Rated thermal stability current (effective value) |
kA |
20 |
25 |
31.5 |
40 |
|
6 |
Rated dynamic stability current (peak value) |
50 |
63 |
80 |
100 |
||
7 |
Rated short-circuit closing current (peak) |
50 |
63 |
80 |
100 |
||
8 |
Rated short-circuit start current breaking times |
Times |
80 |
80 |
50 |
30 |
|
9 |
Power frequency withstand voltage of secondary circuit (1min) |
V |
2000 |
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10 |
Rated operating sequence |
Points ~ 0.3s combined points ~ 180s combined points Points ~ 180s ~ combined points ~ 180s ~ combined points (40kV) |
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10 |
Rated thermal stability time |
S |
4 |
||||
11 |
Rated single/back-to-back capacitor bank breaking current |
A |
630/400 |
800/400 |
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12 |
Mechanical life |
Times |
20000 |