Active leaked current on-line measurement method for power distribution network
A leakage current and distribution network technology, which is applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve the problems of not considering the influence of the damping resistance of the arc suppression coil, and cannot measure the active leakage current online, so as to reduce the threat of personal injury. , Eliminate the influence of internal impedance and damping resistance, the effect of simple operation
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[0019] The content of the present invention will be further described and explained below in conjunction with the accompanying drawings.
[0020] Such as figure 1 as shown, , , Three-phase power supply for the distribution network, g A , g B 、g C is the three-phase ground leakage conductance of the distribution network, C A , C B 、C C is the three-phase-to-ground capacitance of the distribution network, L p is the arc suppressing coil, R 0 is the damping resistor. First, a specific frequency is injected into the distribution network through the zero-sequence voltage transformer of the distribution network. current signal ; where a specific frequency It is an integer multiple of non-power frequency or power frequency. Then measure the returned voltage signal on the secondary side of the voltage transformer inside the arc suppression coil .
[0021] At this time, the measurement equivalent diagram is as follows figure 2 shown. in, is the capa...
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