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发明公开
CN106066447A 整流变压器阀侧直流系统短路故障的判别方法和系统 失效 - 权利终止

整流变压器阀侧直流系统短路故障的判别方法和系统
摘要：
本发明提供一种整流变压器阀侧直流系统短路故障的判别方法和系统，方法包括：通过在整流柜的输出端的直流正极线路上的监测点TA1、TA2……TAN，获取整流柜的输出端的直流正极线路上的在线测量直流电流I1、I2……In；通过在负载的输入端正极线路上监测点TAj，获取负载的输入端的直流正极线路上的在线测量直流电流Ij；计算整流柜输出端的直流正极线路上的在线测量直流电流绝对值之和I∑；计算整流柜电流比I∑*，计算负载电流比Ij*，根据整流柜电流比I∑*与负载电流比Ij*之间的差值判断直流差动保护是否动作。
摘要（英）：

The invention provides a method and a system for judging the short circuit fault of a rectifier transformer valve-side DC system. The method comprises the steps of acquiring the online measurement DC currents I1, I2,...., and In of a positive DC circuit at the output end of a rectifier cabinet through monitoring points TA1, TA2,..., and TAN arranged on the positive DC circuit at the output end of the rectifier cabinet; acquiring the online measurement DC current Ij of a positive DC circuit at the input end of a load through a monitoring point TAj of the positive DC circuit at the input end of the load; calculating the sum I sigma of the online measurement DC current absolute values of the positive DC circuit at the output end of the rectifier cabinet; calculating the current ratio I sigma * of the rectifier cabinet, calculating the current ratio Ij* of the load, and judging whether the DC differential protection is activated or not based on the difference between the current ratio I sigma * of the rectifier cabinet and the current ratio Ij* of the load.

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