ZW10-12FGG/630A dual-power automatic transfer high-voltage vacuum circuit breaker

The ZW10-12 series outdoor high-voltage dual-power vacuum circuit breaker is a three-phase AC 50Hz outdoor high-voltage switchgear used for 12kV rated voltage power distribution systems. Its main function is to realize automatic switching in dual-power supply systems. When one power supply fails or suffers under-voltage, it can automatically switch to another normal power supply, thereby reliably ensuring the continuity of power supply for important loads.

I. Product Overview and Composition

This series of products usually consists of two parts: a high-voltage vacuum circuit breaker and an intelligent dual-power switching controller. Some models may also include bilateral disconnecting switches. Its operating mechanism is mainly the CT23 type spring energy storage mechanism, which supports both electric and manual operation modes.

II. Main Features

Highly reliable power supply: Its core function is to realize automatic switching between two power supplies, which is especially suitable for important places where power outages are not allowed, such as coal mines, oil fields, mines, metallurgy, chemical industry, railways, and urban and rural power distribution systems.

Safe interlocking: It is equipped with complete mechanical and electrical interlocking functions to ensure complete isolation of the two high-voltage power supplies, effectively avoiding misoperation and re-power supply shocks during load faults.

Easy maintenance: It adopts vacuum arc extinction technology to achieve oil-free and air composite insulation. The product has the characteristics of no oil filling, no gas filling, small size, light weight, and no need for maintenance.

Intelligent control: It is equipped with an intelligent controller, which can realize functions such as incoming call delay closing, priority power supply setting, overcurrent and instantaneous protection, one-time reclosing and locking.

III. Main Technical Parameters

Rated voltage: 12 kV.

Rated current: Common specifications include 630A, 1250A, etc.

Rated short-circuit breaking current: Commonly 20kA, 25kA.

Mechanical life: Usually up to 10,000 times.

Operating conditions:

Ambient air temperature: -25℃ ~ +40℃.

Altitude: No more than 2000 meters.

Wind speed: No more than 34m/s.

IV. Example of Model Meaning

Take ZW10-12G/630-20 as an example:

Z: Vacuum circuit breaker.

W: For outdoor installation.

10: Design serial number.

12: Rated voltage 12kV.

G: Usually means "isolation" or a specific design (the meaning may vary slightly among different manufacturers).

630: Rated current 630A.

20: Rated short-circuit breaking current 20kA.

V. Main Functions

Automatic switching: It monitors the voltages of the two power supplies in real time, automatically switches to the backup power supply when the main power supply fails, and can automatically or manually switch back to the main power supply after the main power supply is restored according to the settings.

Protection function: It has time-limited overcurrent protection and instantaneous protection functions to provide protection for load-side faults.

Flexible operation: It supports switching between automatic mode and manual maintenance mode.

This series of products is one of the preferred equipment to replace traditional oil-insulated circuit breakers and realize oil-free and automated power distribution systems, with the characteristics of small footprint, low investment, and convenient debugging and maintenance.