| Customization: | Available |
|---|---|
| Breaking Capacity: | High Voltage Circuit Breakers |
| Operation: | Electric Type |
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General
VB4 medium-voltage indoor vacuum circuit breaker is applicable for three-phase AC power system of rated voltage up to 12~24kV and frequency 50/60Hz,widely used in many fields such as power plant, transformer substation, petrol chemical industry, metallurgy, manufacturing industry, airport, residential area, etc., to control and protect the electric equipment, especially, It is used for the occasion that needs infrequent operation at rated current or multi-breaking short circuit current, may be mounted in the indoor air insulating switchgear like type KYN28 or AMS series, etc. This circuit breaker is standards as GB1984-2003 AC high voltage circuit breaker, JB3855 3.6-40.5Kv indoor AC High voltage circuit breaker, DL/T403 Specification of 12-40.5Kv indoor High voltage vacuum circuit breaker for order as well as IEC60694.
This circuit breaker is made with mature APG technology. The application of VB4 terminal buffer guarantees the indoor terminal is ever more reliable in nay operation environment. VB4 can fully meet the requirement of GB, DL, IEC, DIN, VDE as well as standards of other advanced industrial countries.
Service environment
a) Air temperature: Maximum temperature: +40ºC; Minimum temperature:-25ºC
b) Humidity: Monthly average humidity 95%; Daily average humidity 90% .
c) Altitude above sea level: Maximum installation altitude: 2500m
d) Ambient air not apparently polluted by corrosive and flammable gas, vapor etc.
e) No frequent violent shake
Main technical specifications
| No | Item | Unit | Parameter | |
| 1 | Rated voltage | kV | 12/17.5 | 24 |
| 2 | Rated frequency | Hz | 50/60 | |
| 3 | Rated current | A | 630, ...4000A | |
| 4 | 1min Power frequency withstand voltage | kV | 48 | 65 |
| 5 | Lightning impulse withstand voltage | kV | 75/95 | 125/150 |
| 6 | Rated short circuit breaking current (peak) | kA | 50/63/80/100 | |
| 7 | Rated active load and close circuit breaking current | A | 63 | 50 |
| 8 | Rated short breaking current | kA | 20, …40 | |
| 9 | Rated short circuit making current (peak) | kA | 50/63/80/100 | |
| 10 | Rated cable(line) charging breaking current | A | 50 and 10 | |
| 11 | Rated capacitor bank switching current | A | 400 | |
| 12 | Rated withstand current (peak) | kA | 50/63/80/100 | |
| 13 | Short time withstand current (4s) | kA | 20, …40 | |
| 14 | Mechanism life | times | 10000 | |
Note: For short circuit breaking current & rated current is optional by clients.
Advanced techniques and capabilities
The circuit-breaker VB4-12(24) is the newest equipment in the voltage class of 12kV up to 24kV manufactured by Zhejiang Farady Electric Co., Ltd. It is universal used in power distributing and transforming systems of power stations, power generators, and secondary substations of mines, industries and infrastructures.
The circuit-breaker VB4-12(24) has complete type specifications:
the rated voltage is 12kV, the rated current is up to 4000A and the rated short circuit breaking current is up to 50kA.
The circuit-breaker VB4-12(24) is equipped with modularized spring operating mechanism which has characteristic of more convenient maintenance, rapider replacing of parts and more reliable performance.
The circuit-breaker VB4-12(24) adopts embedded poles that the vacuum interrupter with low resistance and the primary main electrical circuit are cast in insulating cylinders by epoxy resin.
This structure makes the breaker have more reliable insulation.
The embedded poles of circuit-breaker VB4-12(24) have the technique of ventilation and convection. Besides, the vacuum interrupter is with low resistance. All of these reduce the power consumption and the temperature rising due to the longtime running of circuit-breaker.
The circuit-breaker VB4-12(24) has perfect performance when it is breaking short-circuit current or being operated frequently.
Beside that it also has the functions of automatic reclosing and reliable operating.
The driving mechanisms of circuit-breaker VB4-12(24) are designed by professionals in CooperNature and with characteristic of reliable closing performance, low impact force and longer lifetime. The mechanical lifetime can be up to 30000 cycles.
performance is ensured. The circuit-breaker is also applicable to humid and hot regions.
The circuit-breaker VB4-12(24) has been through the whole type test in accordance with the standards of GB and IEC.
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