ZW32-12FGG/630A Dual Power Supply Automatic Transfer Switch Circuit Breaker, 10kV Pole-Mounted Dual-Isolation Vacuum Circuit Breaker

The ZW32 series dual-power circuit breaker is a high-voltage distribution device designed to enhance power supply reliability, primarily used in dual-power supply systems with an AC frequency of 50 Hz and a rated voltage of 12 kV or 40.5 kV. Its core function is to automatically switch to another normal power source when one power source experiences a power outage or undervoltage, ensuring the continuity of power supply.

Main Models and Features

This series mainly includes models of two voltage levels:

ZW32-12 series: Rated voltage is 12 kV. Common models such as ZW32-12GG/630 and ZW32-12FGG/630A are usually composed of a single high-voltage vacuum circuit breaker and double-side disconnectors, forming a dual-power automatic switching device. Some models adopt a "double disconnection" design, meaning both the incoming and outgoing line sides are equipped with disconnectors and reliable interlocking devices, which facilitates line inspection and maintenance and improves safety. The models integrate intelligent controllers (such as the MG intelligent dual-power switching controller), with watchdog functions, enabling intelligent management such as automatic fault isolation and load monitoring.

ZW32-40.5 series: Rated voltage is 40.5 kV, suitable for 35 kV systems. This model belongs to the "primary and secondary integrated" pole-mounted switch, deeply integrating the high-voltage vacuum circuit breaker body with the intelligent control unit (FTU), integrating protection, control, metering, and communication functions.

Core Functions and Working Principle

Automatic Power Switching: When the normal power source fails, the device can automatically switch to the standby power source. Manual or selective switching can also be performed as needed.

Protection and Interlocking Functions: It has protection functions such as short circuit and overcurrent, and an interlocking mechanism. When overcurrent is detected (e.g., the current on the secondary side of the current transformer exceeds the set value), the device will perform closing locking and disconnect the currently operating vacuum switch, avoiding unnecessary power supply impact during load faults. Intelligent models also have functions such as fault locking, PT disconnection locking, and switch position locking.

Intelligent Management (for some models): Models with integrated intelligent controllers can achieve the following advanced functions:

Automatically eliminate single-phase ground faults in the user area, avoiding impact on the power supply of adjacent users.

Automatically isolate phase-to-phase short circuit faults in the user area, and cooperate with the substation reclosing to quickly restore power supply in non-fault areas.

Quickly locate fault points, and support automatic reporting of fault information via communication modules.

Monitor user loads, and as a remote terminal with "three remote" (remote control, remote measurement, remote signaling) functions, it can be connected to a comprehensive management system.

Support multiple communication methods (cable, optical fiber, GPRS, etc.), and can be remotely connected to automation systems.

Structure and Operation

The product structure usually includes a vacuum interrupter, current transformer, transmission mechanism, and operating mechanism, etc. Operation methods support manual, electric, intelligent, and permanent magnet types. During installation, care should be taken to avoid damage to the insulators from force; when wiring, use two wrenches to tighten the connections. The product requires regular maintenance; it is recommended to inspect the wear of moving parts of the operating mechanism every three months, remove dust, and add lubricating oil to the moving parts.

Application Scenarios

This series of products is widely used in occasions with high requirements for power supply continuity, such as important facilities, urban distribution networks, rural power grids, industrial parks, etc. Its design has certain environmental adaptability, and it can operate outdoors, in plateau areas, and in high-temperature and humid regions.

Ordering Notes

When ordering products, the following must be specified: circuit breaker model, name, quantity; model of the matched operating mechanism and control voltage; current transformer ratio; and the name and quantity of required spare parts and accessories.