Dc electric current relay device
专利汇可以提供Dc electric current relay device专利检索，专利查询，专利分析的服务。并且PURPOSE: To rapidly and certainly detect a defective electric current by constituting the captioned device so that a dc breaker is opening-controlled on the basis of the difference between the actually measured electric current value in a dc circuit and the estimated electric current value obtained from the actually measured electric current value and the difference of the actually measured electric current value and the electric current value at the sharp electric current variation point.
CONSTITUTION: An electric current transformer 22 for converting the primary circuit electric current which flows in a dc feeder line to the secondary electric current and a voltage transformer 23 for converting the dc voltage of a substation to the input signal supplied into a processing device are installed. Each output signal of these transformers 22 and 23 is taken into an MPU 25 through an input device 24, and the difference between the actually measured electric current value on the basis of the above-described dc electric current and the estimated electric current value obtained through calculation is obtained. When the detection value of the difference exceeds the first set value, the difference between the actually measured electric current value and the electric current value at the sharp electric current variation point of the actually measured electric current value is detected, and when the detection value exceeds the second set value, and the sum of the variation portion of the electric current in the feeder circuit having the section interposed exceeds the third set value, control is performed so that a dc breaker 20 is opened.
COPYRIGHT: (C)1988,JPO&Japio，下面是Dc electric current relay device专利的具体信息内容。
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