基于固态限流器的短路电流快速阻断策略

提出了一种基于LC串联谐振电路的固态短路电流阻断器(LCSRSCB)。在正常模式下,由于谐振结构的配置(电容器和电抗器),对原有线路的影响可以忽略不计;在故障模式下,LCSRSCB的拓扑结构改变为LC振荡整流桥,电网交流电压对电容器进行快速充电,利用电容器电压反向阻断短路电流。为提高阻断器的快速性,采用差动保护检测短路状态。分别进行了仿真、实验,验证了所提方法的有效性。相比于传统的阻断电路,所提策略电路结构简单、响应速度快、元器件过流能力强,非常适合于交流微电网应用。

HX_D1型电力机车充电器模块烧损原因分析及解决方案

针对大秦线HXD1型机车充电器模块烧损问题情况,深入查找烧损原因并提出解决方案,有效解决了此类问题的大量发生,保证了HXD1型机车充电器模块质量稳定。

Analysis of the Correlation between the Level of Contact Degradation and the Dynamic Resistance Curve in Circuit Breakers

The DRM （dynamic contact resistance measurement） in high voltage circuit breakers is a manner of evaluating the internal ageing condition of the chamber. DRM is similar to static contact resistance measurement testing, but instead of measuring a single value when the breaker contacts are closed （static value）, the ohmic resistance is measured at various contact positions, from the beginning of the contact opening until a complete separation of the contacts. The relationship between the contact resistances of the new circuit breaker and the ageing circuit breaker in operation provides subsidy for the evaluation of both the main and arcing contact conditions. This research aims to analyze the correlation between the various levels of degradation of the contacts and the configuration of the DRM curve. This work considers curve samples from new acceleration tests. breaker chamber contacts and different levels of degradation by