Overview

The ZW10-12XDG Series high-voltage dual-power automatic transfer switching device is an outdoor vacuum-circuit-breaker-based unit for AC 50Hz, 12kV distribution systems with two supply sources and rated current up to 630A. It is made up of a high-vacuum circuit breaker and an intelligent controller. When one supply source fails or drops to undervoltage, the device automatically transfers the load to the healthy source to guarantee continuous power supply, and reverts to the normal source once it is restored (self-transfer and self-revert).

The device provides short-circuit and overcurrent protection with interlock functions, effectively preventing unnecessary re-energization impact during load faults, and ensures complete electrical isolation between the two high-voltage sources. Reliable mechanical and electrical interlocking gives the unit a very high level of safety. It is intended as the control and protection device of dual-power supply systems for users with high requirements on supply reliability, and is widely used on 10kV distribution lines in oil fields, mines, metallurgy, chemical, railway, communication and machinery applications.

Model Designation

Construction

The ZW10-12XDG adopts a three-phase column structure with vacuum interrupters housed in a sealed tank on a common base frame. The incoming and outgoing terminals (A-side and B-side) are arranged for two independent power sources, and an external stainless-steel mechanism box houses the spring-storage mechanism, the intelligent controller and the transfer logic.

The intelligent controller monitors both supply sources and performs automatic transfer and reversion. Short-circuit and overcurrent protection, together with mechanical and electrical interlock, prevent parallel operation of the two sources, and a manual operating handle is provided for emergency operation. The hermetically sealed vacuum interrupters ensure a long maintenance-free service life in harsh outdoor environments.