PT secondary circuit online N-line multipoint ground fault detection method and device
A secondary circuit, multi-point grounding technology, applied in the direction of measuring device, fault location, measuring electricity, etc., can solve problems such as poor effect and low reliability, and achieve the effect of high efficiency, high reliability, and convenient and fast search method.
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[0044] The online N-line multi-point grounding fault detection method of the PT secondary circuit of the present invention comprises:
[0045] Step 1, install the jaws of the first clamp current transformer CT1 and the second clamp current transformer CT2 on the public circuit N600 of the PT secondary circuit, wherein the secondary of the first clamp current transformer CT1 The winding is connected in series with an adjustable resistor Rw;
[0046] Step 2, adjusting the resistance value of the adjustable resistor Rw to change according to the preset time-resistance curve, and synchronously recording the first time-current curve of the secondary winding induced current of the second clamp-on current transformer CT2;
[0047] Step 3: Compare the first time-current curve with the preset time-resistance curve, if they tend to change in the same way, it is determined that there is a N-line multi-point ground fault in the PT secondary circuit; otherwise, it is determined that the PT...
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