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Outdoor AC HV

Product Overview

The ZW32-12 series outdoor on-post AC HV vacuum circuit breaker (hereinafter referred to as circuit breaker) is an outdoor distribution equipment in maximum rated voltage of 12kV, and three-phase AC 50Hz. It is mainly used for breaking and switching the load current, overload current and short-circuit current in the power system; and suitable for protection and control of power distribution system in substations and industrial and mining enterprises, and places with frequent operation in the rural power grids.

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Structural Characteristics

  • Circuit breaker is used with three-phase pillar structure, and has advantages of stable and reliable breaking performance,compact size, light weight and long service life.
  • The circuit breaker features totally enclosed structure, excellent sealing, moisture-proof, and anti-condensation.
  • Three-phase pillar and current transformer are insulated with imported outdoor epoxy resin solid insulation, having advantages of high and low temperature resistant, UV resistant, and anti-aging.
  • The operating mechanism is a miniature spring-operated mechanism, featuring low energy consumption for opening and closing; the mechanism drive is in mode of direct drive, featuring fewer opening/closing parts and high reliability.
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Structural Characteristics

  • The opening and closing of circuit breaker can be manually or electrically operated and remotely operated . The circuit breaker can be used to form complete set with the controller in realizing automation of distribution network.
  • The circuit breaker can be used in combination with the power load monitoring system.
  • The circuit breaker is externally installed with electronic PT. The electronic PT obtains current from the transformer and then converts the current to voltage, and provides protection and control functions.
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Main Specifications and Technical Parameters

Performance parameter of circuit breaker

No. Description Unit Parameters
1 Rated voltage kV 12
2 Rated frequency Hz 50
3 Rated current A 630　1250
4 Rated short-circuit breaking current kA 20
5 Rated peak withstand current (peak) kA 50
6 Rated short-time withstand current / duration kA/S 20/4
7 Rated short-circuit making current (peak) kA 50
8 Mechanical life Number of cycles 10000
9 Breaking operations of rated short-circuit breaking current Number of cycles 30
10 Power frequency withstand voltage (1min): (wet) (dry) phase-to-phase, phase-to-ground / fracture kV 34/42/48
11 Lightning impulse withstand voltage kV 75
12 Secondary circuit 1min power frequency withstand voltage压 KV 2

Mechanical characteristic parameter

No. Description Unit Parameters
1 Contacts spacing mm 9±1
2 Contact over-travel mm 2±0.5
3 Opening speed m/s 1.2±0.2
4 Closing speed m/s 0.8±0.2
5 Bouncing time of contactor closed ms ≤2
6 Center distance between phases mm 340±1.5
7 Time interval between opening of first and last phase of three phase circuit-breaker ms ≤2
8 Phase-wise conductive loop resistance μΩ ＜80
9 Closing time ms 25~60
10 Opening time ms 18~45
11 Rated power of energy storage motor W 40

Switch isolator parameters

No. Description Unit Parameters
1 Rated voltage kV 12
2 Rated current A 630
3 Thermal stability current (effective value) kA 20
4 Dynamic stable current (peak) kA 50
5 1min power frequency withstand voltage kV 48
6 Each phase loop resistance μΩ ＜60
7 Non-synchronism at the instant of closing contact knife mm ＜2
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