Direction diagnosing system of grounded fault of small current grounded distribution system
A small current grounding and grounding fault technology, applied in the phase angle between voltage and current, measuring electricity, measuring electrical variables, etc., can solve the problems that single-phase grounding fault detection and reliable identification have not been completely solved, and achieve detection The method is novel, the cost is low, and the effect of facilitating installation
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[0029] see figure 1 As shown in the figure, the output voltage of channel A of the three-phase power supply in the figure is recorded as V a , the B-channel output voltage of the three-phase power supply is denoted as V b , the output voltage of circuit C of the three-phase power supply is denoted as V c ; ZCT is a zero-sequence current transformer (selecting Baoding Zhongbang Electric Co., Ltd. to produce the model ZB-LJ-120 current transformer), and the zero-sequence current detected by ZCT is denoted as I 0 ; The A-way load of the three-phase power supply is recorded as R 1 , the B-circuit load of the three-phase power supply is denoted as R 2 , the C-circuit load of the three-phase power supply is denoted as R 3 ; The neutral point of the three-phase power supply is grounded through the arc suppression coil L; the distributed capacitance of the A circuit on the power supply side to the ground is recorded as C 1 , capacitance C 1 The capacitance is denoted as AC 1 , ...
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