概述 /Summary
ZW20-12/T □ - □系列型户外高压真空断路器（以下简称断路器）为额定电压 12kV, 三相交流 50Hz 的户外配电设备。它采用真空灭弧和 SF6 气体作为绝缘介质，是 ZW20-12F 型柱上真空断路器改进型产品。箱体采用了 VSP5 的气体密封、防爆、绝缘结构技术，进出线导管也进行了密封性能改进，整体密封性能优良，内部充装的 SF6 气体不泄漏，不受外界环境影响；其弹簧操作机构进行了小型化设计和可靠性和稳定性优化，采用直动链条主传动和多级脱扣系统，动作可靠性和稳定性比国内传统的弹簧操作机构提高了好几倍；主回路的轴与套之间的接触采用了内收外张式表链结构，主回路的接触电阻小、温升低。所以，ZW20 - 12 F 型户外柱上真空断路器是一种免维护产品，是柱上断路器中的佳品。
ZW20-12 较 ZW20-12F 还增加了过流保护、机构弹簧储能指示，并配备航空插座作二次电气连接，便于与智能化控制器相结合。优良的电气和机械性能，使 ZW20-12F 型户外柱上真空断路器得到广泛的应用。主要用于开断、关合 10kV 电力系统的负荷电流及短路电流，适用于变电站及工矿企业配电系统中作保护和控制之用，更适用于电网频繁操作的场所。本产品与控制器配套，具有优良的重合器功能，能满足配电自动化系统要求。
ZW20-12/T □ - □ series outdoor high-voltage vacuum circuit breaker (hereinafter referred to as circuit breaker) is an outdoor power distribution equipment with rated voltage of 12kV and three-phase AC 50Hz. It uses vacuum arc extinguishing and SF6 gas as the insulating medium, and is an improved version of the ZW20-12F on-column vacuum circuit breaker. The box adopts VSP5's gas sealing, explosion-proof and insulated structure technology, and the sealing performance of the inlet and outlet conduits has also been improved, with excellent overall sealing performance, and the SF6 gas filled inside does not leak and is not affected by the external environment; Its spring operating mechanism has been miniaturized and optimized for reliability and stability, and the direct chain main drive and multi-stage trip system are adopted, and the action reliability and stability are several times higher than that of the traditional spring operating mechanism in China. The contact between the shaft and the sleeve of the main circuit adopts the inward and external tension type bracelet structure, and the contact resistance of the main circuit is small and the temperature rise is low. Therefore, the ZW20-12 F outdoor column vacuum circuit breaker is a maintenance-free product and is the best product among column circuit breakers.
Compared with ZW20-12F, the ZW20-12 also adds over-current protection, mechanism spring energy storage indication, and is equipped with aviation socket for secondary electrical connection, which is easy to combine with intelligent controllers. Excellent electrical and mechanical properties make the ZW20-12F outdoor column vacuum circuit breaker widely used. It is mainly used for breaking and closing the load current and short-circuit current of the 10kV power system, which is suitable for protection and control in the power distribution system of substations and industrial and mining enterprises, and is more suitable for places with frequent operation of the power grid. This product is matched with the controller, has excellent recloser function, and can meet the requirements of distribution automation system.
