RCS-915型微机母线差动保护原理及应用改进

Principle and improvement on the application of RCS-915 numerical bus-bar protection

RCS-915型微机母线保护装置,适用于各种电压等级的单母线、单母线分段、双母线等各种主接线方式。装置设有母线差动保护等保护功能。但在实际试验及应用中,作者发现:母联开关在分位,母线电压正常,而PT二次侧连接的电压保险或电压空气小开关出现故障,即二次电压不能正确反映一次电压的情况下,故障发生在故障死区时,母差保护会出现误判现象,跳开非故障母线,从而导致停电范围的扩大。通过对差动保护逻辑框图的深入分析,文中给出了解决此问题的方法,从而避免了非故障线路的误动,减少了停电范围,有着非常重要的工程实用价值。

This paper introduces the differential protection＇s new principle＇s appliance and the principle of RCS -915 numerical bus-bar protection. In fact, when the fault occurs at dead zone ,the voltage of the bus-bar is normal ,while there is some problem in voltage fuse of secondary of PT, so, secondary voltage can not reflect the primary, as a result, the result is not true, to expend the outage dimension. By analysis, the paper proposes a new program, which can avoid the default and reduce the outage dimension.