Ground capacitance detection method for neutral point via arc suppression coil grounding system
An arc suppression coil grounding and arc suppression coil technology is applied to emergency protection circuit devices, measuring devices, electrical components and other directions for limiting overcurrent/overvoltage, and can solve problems such as poor real-time performance.
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[0037] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0038] The "pre-adjusted" arc suppression coil is connected in series or in parallel with the damping resistor to limit the neutral point displacement overvoltage when the power grid is working normally, and the power electronic switch is gradually used to quickly exit the damping resistor under fault conditions because of its rapidity of action. Aiming at the above-mentioned "pre-adjusted" arc suppressing coil with power electronic switch, this paper proposes a new ground capacitance detection method, that is, by instantaneously changing the working state of the power electronic switch used to switch the damping resistor, in order to generate rich frequency The disturbance voltage and current pulse of the components, using the disturbance voltage and current signals combined with the harmonic impedance measurement method based on power electronic distur...
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