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A method for on-line measurement of capacitive current in distribution network

A capacitive current and measurement method technology, which is applied in the direction of capacitance measurement, measuring device, and electric variable measurement, can solve problems such as difficulty in selecting the frequency of injection signals and large measurement errors, so as to reduce the threat of personal injury, make measurement safe and fast, and improve measurement accuracy. The effect of precision

Active Publication Date: 2019-11-26
JINING POWER SUPPLY CO OF STATE GRID SHANDONG ELECTRIC POWER CO +2
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  • Application Information

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Problems solved by technology

It is difficult to select the frequency of the injected signal by the above two injection current methods, and the influence of the damping resistance connected in series with the arc suppression coil is ignored, so the measurement error is relatively large

Method used

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  • A method for on-line measurement of capacitive current in distribution network
  • A method for on-line measurement of capacitive current in distribution network
  • A method for on-line measurement of capacitive current in 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 cap...

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Abstract

The invention discloses a method for online measuring the capacitance current of a distribution network. The method is used for measuring the capacitance current of a distribution network where a neutral point is connected in series with a damping resistor to be grounded via an arc suppression coil, and comprises steps of: inputting a current signal with a specific frequency rather than the powerfrequency into the distribution network via a distribution network zero-sequence voltage transformer; measuring a returned voltage signal at a voltage transformer in the arc suppression coil; and calculating the ground capacitance of the distribution network and the capacitance current of the distribution network. The method realizes the on-line measurement of the capacitance current, and does notneed to change the primary-side wiring of the distribution network during measurement, does not affect the normal operation of the distribution network, and can eliminate the influence of the internal impedance and the damping resistance of the voltage transformer, and is safe, simple, economical and precise in measurement.

Description

technical field [0001] The invention relates to an on-line measurement method for the capacitive current of a distribution network, which is suitable for on-line measurement of the capacitive current of the neutral point through the arc-suppression coil series damping resistance grounding distribution network. 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. Accurate and fast measurement of capacitive current in distribution network is the basis for determining arc suppression coil capacity and arc suppression coil tuning control. [0003] "Overvoltage Prote...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R27/26G01R19/00
CPCG01R19/00G01R27/2605
Inventor 王彦良曾祥君陈晓红赵锐喻锟刘祥国姚博文赵岩刘玉玲
Owner JINING POWER SUPPLY CO OF STATE GRID SHANDONG ELECTRIC POWER CO
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