ZW32-12FGG/630A Double-Isolation Pole-Mounted High-Voltage Vacuum Circuit Breaker, 10KV Outdoor Dual-Power Vacuum Switch

The ZW32-12GG double-isolation circuit breaker is an outdoor high-voltage switchgear with a rated voltage of 12kV and three-phase AC 50Hz. Its full name is "ZW32-12GG Outdoor High-Voltage Double-Isolation Vacuum Circuit Breaker". This device integrates a vacuum circuit breaker and two side disconnectors, and is mainly used in urban and rural power grids as well as power distribution systems of industrial and mining enterprises, to achieve reliable breaking and closing of load current, overload current and short-circuit current, and is especially suitable for occasions requiring high power supply reliability for automatic switching of dual power supplies.

I. Product Overview and Core Functions

The core design of the ZW32-12GG is the "double-isolation" structure, which 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 protection, control and isolation of distribution lines.

Automatic transfer of dual power supplies (standby automatic transfer): As a core component of the dual power supply automatic transfer device, when the main power supply experiences a power outage or undervoltage fault, it can automatically and quickly switch the load to the standby power supply, ensuring the continuity of power supply to important loads.

II. Main Technical Features

Structural design: Adopts a three-phase pillar-type fully enclosed structure with a miniaturized design. Insulation parts are usually made of imported outdoor epoxy resin or indoor epoxy resin coated with organic silicone rubber, with excellent moisture-proof, anti-condensation, high and low temperature resistance, ultraviolet resistance and anti-aging performance, suitable for high-temperature, humid and severe cold areas.

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

Operating mechanism: Built-in miniaturized spring operating mechanism, using a true motion transmission method, with few components and high reliability. The mechanism box has a sealed design to effectively prevent rust. It supports manual, electric and remote operation.

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

Safety interlocking: A reliable anti-misoperation interlocking device is set between the circuit breaker and the disconnectors on both sides, ensuring correct operation sequence and protecting the safety of personnel and equipment.

III. Typical Application Scenarios

Urban and rural distribution networks: Used for line segmentation, 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 a key switching equipment of the dual power supply standby automatic transfer system, realizing automatic switching between main and standby power supplies.

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

Frequent operation occasions: Suitable for occasions requiring frequent switching 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: ≥10,000 times

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

Applicable altitude: ≤3,800 meters

V. Key Points for Installation, Commissioning and Maintenance

Commissioning: Before putting into operation, it is necessary to carry out main and standby power automatic transfer commissioning, overcurrent protection function detection and switching operation tests. The automatic transfer logic needs to verify that when the main power supply fails, it can correctly open and switch to the standby power supply, and when the main power supply is restored, it can automatically switch back.

Installation: When hoisting, avoid stress on the insulators. When wiring, use two wrenches to tighten the wiring terminal nuts to prevent the insulators from twisting and being damaged.

Operation: Switching operations can be completed through a manual operating handle 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 a routine inspection every three months, including cleaning dust on the equipment surface, checking the wear of moving parts of the operating mechanism, adding lubricant to the moving parts, and testing electrical performance. If there are situations such as failure to operate or misoperation, the operating mechanism, control circuit and protection setting values should be checked.

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