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

Inactive Publication Date: 2018-08-24
JINING POWER SUPPLY CO OF STATE GRID SHANDONG ELECTRIC POWER CO +2
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Problems solved by technology

Invention patent 2007100345558 proposes an online method for measuring the ground resistance and damping rate of the distribution network, but it does not consider the influence of the damping resistance in series with the arc suppression coil, and cannot be applied to the distribution network grounded at the neutral point through the arc suppression coil in series with the damping resistance On-line measurement of active leakage current

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  • Active leaked current on-line measurement method for power distribution network
  • Active leaked current on-line measurement method for power distribution network
  • Active leaked current on-line measurement method for power distribution network

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Embodiment Construction

[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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Abstract

The invention discloses an active leaked current on-line measurement method for a power distribution network, and the method is used for the measurement of the active leaked current of a grounding distribution network where a neutral point is in series connection with a damping resistor through an arc extinguishing coil. The method comprises the steps: injecting a non-power-frequency specific frequency current signal to the distribution network through the zero-sequence voltage transformer of the distribution network; measuring a returned voltage signal in the arc extinguishing coil through avoltage transformer; calculating the ground leakage conductance of the distribution network and the active leaked current of the distribution network. The method achieves the online measurement of theactive leaked current, does not need to change the primary side wiring of the distribution network during measurement, avoids the impact on the normal operation of the distribution network, can eliminate the impact from the internal impedance and damping resistance of the voltage transformer, and is simple, convenient, economical and precise in measurement.

Description

technical field [0001] The invention relates to an online measurement method for the active leakage current of a distribution network, which is suitable for the online measurement of the active leakage current of the distribution network grounded with a neutral point through an arc-suppression coil in series with a damping resistance. Background technique [0002] my country's electric power regulations stipulate that when the capacitive current of the 10kV and 35kV distribution networks is greater than 30A and 10A respectively, an arc suppression coil should be installed to compensate for the capacitive current. Way. my country's current national standard (GBJ63-83) stipulates that the distribution network of 60kV and below must not exceed 10A for the grounding residual current at the fault point. Some literatures point out that after a ground fault occurs in a coal mine in my country, the magnitude of the active component current in the ground current can reach 13.05A. Exc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/02
CPCG01R31/50
Inventor 王毅刘宗杰曾祥君王祥哲刘玉玲张向东赵猛盛伟陈磊
Owner JINING POWER SUPPLY CO OF STATE GRID SHANDONG ELECTRIC POWER CO
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