ZW32-12FGG/630A Double Isolation Pole-mounted High-voltage Vacuum Circuit Breaker, 10KV Outdoor Dual-power Vacuum Switch

The ZW32-12GG dual-isolation circuit breaker is an outdoor high-voltage switching equipment with a rated voltage of 12kV and three-phase AC 50Hz. Its full name is "ZW32-12GG Outdoor High-voltage Dual-isolation Vacuum Circuit Breaker". This equipment integrates a vacuum circuit breaker and double-sided disconnectors, and is mainly used in urban and rural power grids and industrial and mining enterprise power distribution systems to reliably break and close load current, overload current and short-circuit current. It is especially suitable for dual-power automatic switching occasions that require high power supply reliability.

I. Product Overview and Core Functions

The core design of the ZW32-12GG is the "dual-isolation" structure, which means it has double breakpoints for incoming and outgoing lines, and is equipped with reliable mechanical or electrical interlocking devices. Its main functional positioning has two aspects:

Conventional protection and control: As a pole-mounted circuit breaker, it is used for the protection, control and isolation of distribution lines.

Dual-power automatic transfer (standby power automatic switching): As the core component of the dual-power automatic transfer device, when the main power supply fails or has undervoltage faults, it can automatically and quickly switch the load to the backup power supply to ensure the continuity of power supply for important loads.

II. Main Technical Features

Structural design: Adopts three-phase pillar fully enclosed structure with miniaturized design. Insulating components usually use imported outdoor epoxy resin or indoor epoxy resin coated with organic silicone rubber, which has excellent moisture-proof, anti-condensation, high and low temperature resistance, anti-ultraviolet and anti-aging properties, and is suitable for high-temperature, humid and severe cold areas.

Arc extinguishing technology: The circuit breaker part adopts a vacuum arc extinguishing chamber, with stable breaking performance, no risk of combustion and explosion, long service life and maintenance-free features.

Operating mechanism: Built-in miniaturized spring operating mechanism, adopts real-motion transmission mode, with few parts and high reliability. The mechanism box is sealed to effectively prevent rust. It supports manual, electric and remote operations.

Intelligent expansion: It can be equipped with current transformers and voltage transformers, and cooperate with intelligent controllers to realize protection functions such as overcurrent and short circuit, and can form automatic reclosers and sectionalizers to meet the needs of distribution network automation.

Safety interlock: A reliable anti-misoperation interlocking device is installed between the circuit breaker and the disconnectors on both sides to ensure the correct operation sequence and protect the safety of personnel and equipment.

III. Typical Application Scenarios

Urban and rural distribution networks: Used for line sectioning, fault isolation and protection.

Industrial and mining enterprise substations: Used as incoming and outgoing line protection and control equipment.

High-reliability power supply places: Such as oil fields, mines, data centers, hospitals, important factories, etc., as key switching equipment in dual-power standby power automatic switching systems to realize automatic switching between main and backup power supplies.

New energy systems such as photovoltaic: Used as a special dual-power switching switch at the grid connection point of photovoltaic power stations.

Frequent operation occasions: Suitable for occasions that require frequent opening and closing operations such as rural power grids.

IV. Main Technical Parameters (Typical Values)

Rated voltage: 12 kV

Rated frequency: 50 Hz

Rated current: 630A, 1250A

Rated short-circuit breaking current: 20 kA

Mechanical life: ≥10000 times

Applicable ambient temperature: -25℃ ~ +40℃ (the 24-hour average does not exceed +35℃)

Applicable altitude: ≤3800 meters

V. Key Points of Installation, Commissioning and Maintenance

Commissioning: Before putting into operation, commissioning of automatic transfer of main and backup power, detection of overcurrent protection function and opening and closing operation tests shall be carried out. The automatic transfer logic shall verify that it can correctly trip and switch to the backup power supply when the main power supply fails, and automatically switch back when the main power supply is restored.

Installation: Avoid stress on the insulators during hoisting. When wiring, use two wrenches to tighten the wiring terminal nuts to prevent the insulators from being damaged by torsion.

Operation: Opening and closing operations can be completed through manual operating handles or electric/remote control. Before operating the disconnector, it must be confirmed that the circuit breaker is in the open state.

Maintenance: It is recommended to conduct routine inspections every three months, including cleaning dust on the equipment surface, checking the wear of moving parts of the operating mechanism, adding lubricant to moving parts, and testing electrical performance. If situations such as refusal to operate or misoperation occur, check the operating mechanism, control circuit and protection setting values.

The ZW32-12GG dual-isolation circuit breaker, by closely combining the vacuum circuit breaker with the dual-isolation function and integrating the standby power automatic switching logic, has become a key equipment to improve the power supply reliability, safety and automation level of the 12kV distribution network.