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China Suppliers Factory ZW32‑12/M Outdoor High-Voltage AC Permanent-Magnet Vacuum Circuit-Breaker 12kV
Overview
ZW32‑12 Outdoor High‑voltage AC Vacuum Circuit‑Breaker is outdoor distribution equipment with rated voltage 12 kV, three‑phase AC 50 Hz.
Designed for pole‑mounted installation, this device is mainly used to make and break load current, overload current and short‑circuit current in power systems, and provides overload, short‑circuit and instantaneous‑trip protection. Single‑side disconnector, double‑side disconnector or upper‑mounted disconnector can be optionally fitted.
Product Features
Arc‑extinguishing by vacuum interrupter
The vacuum interrupter maintains high‑vacuum inside, acting as insulation and arc‑extinguishing medium during live‑line operation. When contacts separate under load via operating mechanism, vacuum arc generates between contacts and extinguishes at current zero‑crossing to interrupt circuit current.
Composite Insulation
Adopts air‑silicone rubber & epoxy resin composite insulation; sealed‑pole version is optional.
Enclosure & Protection
Fully enclosed in stainless‑steel or carbon‑steel housing. Superior sealing performance delivers explosion‑proof, anti‑condensation and anti‑pollution performance.
Current Transformers (CT)
Two‑phase or three‑phase current transformers can be installed inside for protection, measurement or metering purposes. Triple‑ratio CT is standard: 50‑100‑150/5, 100‑200‑300/5, 200‑400‑600/5. Custom ratios are available according to customer load requirements. Protection accuracy class: 10P10; measurement & metering accuracy class: 0.2S, 0.2, 0.5.
Voltage Transformer (PT)
Dry‑type voltage transformer can be internally fitted to supply operating power and voltage sampling signals.
Automation Ready
Flexible design with reserved interface for distribution network automation for future function expansion.
Optional Disconnector
Reliable mechanical interlock between circuit‑breaker and single‑side / double‑side / upper‑mounted disconnector. Disconnector cannot be switched when circuit‑breaker is in closed position.
Surge Controller & Protection
Housing material: stainless steel or carbon steel. Surge controller (2‑phase / 3‑phase depends on CT quantity) can be fitted to realize overload, short‑circuit and instantaneous‑trip protection. Current setting value and delay time are adjustable.
Operating Mechanism
CT spring mechanism supports both manual and motor‑driven operation.
- Reclosing controller can be equipped for automatic reclosing function.
- Compatible with electronic PT. Battery is powered from CT secondary. Multiple energy‑storage & close‑open operations are available under power‑loss condition, and output working voltage for external devices.
- Built‑in metering CT/PT supports remote prepayment. Zero‑sequence CT for earth‑fault protection works with sectionalizer controller. Simple remote controller is optional for local remote operation at pole base as requested.
Frequently Asked Questions (FAQ)
What are the primary electrical ratings of the ZW32-12 circuit breaker?
The ZW32-12 is an outdoor high-voltage AC vacuum circuit-breaker designed for outdoor distribution equipment with a rated voltage of 12 kV and a three-phase AC 50 Hz system frequency.
What protection capabilities does the device provide?
It is primarily used to make and break load current, overload current, and short-circuit current, providing overload, short-circuit, and instantaneous-trip protection. An optional zero-sequence CT can also be used for earth-fault protection in combination with a sectionalizer controller.
What disconnector configurations are supported?
Single-side disconnectors, double-side disconnectors, or upper-mounted disconnectors can be optionally fitted. They feature a reliable mechanical interlock that prevents the disconnector from being switched when the circuit breaker is in the closed position.
What standard Current Transformer (CT) ratios and accuracy classes are available?
Standard triple-ratio CTs include 50-100-150/5, 100-200-300/5, and 200-400-600/5, with custom ratios available upon request. The protection accuracy class is 10P10, while the measurement and metering accuracy classes are 0.2S, 0.2, and 0.5.
How does the operating mechanism function during power outages?
The CT spring operating mechanism supports both manual and motor-driven operation. When compatible with an electronic PT, the battery is powered from the CT secondary, enabling multiple energy-storage and close-open operations even under power-loss conditions.
How does the ZW32-12 adapt to distribution network automation?
The equipment features a flexible design with reserved automation interfaces. It can be equipped with a reclosing controller for automatic reclosing, built-in metering CT/PT for remote prepayment, and an optional remote controller for pole-base local operation.