Direct earth capacitance gauge in converting station power distribution system
A technology of power distribution system and capacitance to ground, which is applied in the direction of emergency protection circuit devices, measuring devices, and measuring electrical variables for limiting overcurrent/overvoltage, and can solve problems such as increasing system risks and endangering large phase-to-phase short circuits. Achieve the effect of avoiding system risk and ensuring measurement accuracy
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[0013] refer to figure 1 and figure 2 , a ground-to-ground capacitance measuring instrument in a substation power distribution system of the present invention includes a signal acquisition device 1 for collecting current and voltage signals in an arc suppression coil, a main controller 2 with control and analysis functions, and a For the H-bridge inverter circuit 3 that provides commutation signals to the power grid, the signal acquisition device 1, the main controller 2, and the H-bridge inverter circuit 3 are connected in sequence, wherein the input terminal of the signal acquisition device 1, the H-bridge inverter The output terminal of the transformation circuit 3 is connected to the grounding device 4 of the arc suppressing coil of the grid. In view of the current arc suppressing coil having an operation mode close to the resonance point with additional damping resistance and an operation mode far away from the resonance point without damping resistance, the main contro...
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