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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.

Inactive Publication Date: 2015-09-16
SHANDONG UNIV
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Problems solved by technology

This method has high measurement accuracy, but poor real-time performance

Method used

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  • Ground capacitance detection method for neutral point via arc suppression coil grounding system
  • Ground capacitance detection method for neutral point via arc suppression coil grounding system
  • Ground capacitance detection method for neutral point via arc suppression coil grounding system

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Embodiment Construction

[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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Abstract

The invention discloses a ground capacitance detection method for a neutral point via arc suppression coil grounding system. A preset type arc suppression coil is in serial or parallel connection with a damping resistor so as to limit the neutral point displacement overvoltage during normal work of a power grid and an electronic power switch is gradually used for rapidly exiting from the damping resistor under the fault state due to the rapid action of the electronic power switch. According to the novel ground capacitance detection method for the preset type arc suppression coil comprising the electronic power switch, the working state of the electronic power switch of the damping resistor is switched through instantaneous control so as to generate the rich frequency component contained disturbance voltage and current pulse and the system ground capacitance is calculated through the disturbance voltage and current signal and the combination with an electronic power disturbance technology based harmonic impedance measurement method for self-tuning of the arc suppression coil.

Description

technical field [0001] The invention relates to a grounding capacitance detection method for a neutral point grounding system through an arc suppression coil. Background technique [0002] The neutral point non-effective grounding method is mostly used in my country's medium-voltage distribution network. With the expansion of the grid scale, the number of grid outlets increases, and the line-to-ground capacitive current increases day by day. The single-phase ground fault arc is difficult to self-extinguish, and generates high overvoltage, which may endanger the healthy phase and cause a two-phase short circuit. Therefore, it is necessary to use an automatic tuning arc suppression coil device for compensation to ensure the reliability of the distribution network operation. [0003] The key to the automatic tracking compensation of the arc suppression coil is to accurately measure the capacitance of the system to ground to determine the input capacity of the arc suppression c...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H9/08G01R27/26
Inventor 殷鹏朱珂刘颖英刘文华
Owner SHANDONG UNIV
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