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Novel power distribution network capacitance and current measurement method and system

A capacitive current and measurement method technology, applied in the direction of measuring devices, measuring electrical variables, measuring current/voltage, etc., can solve the problems of non-linear error of test results, rise of neutral point voltage to phase voltage, different characteristics, etc., to achieve The effect of high measurement efficiency, low safety risk and avoidance of nonlinear error

Pending Publication Date: 2021-03-23
GUANGXI POWER GRID ELECTRIC POWER RES INST
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  • Claims
  • Application Information

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Problems solved by technology

And because the configured PT is not the same, its characteristics will be different, resulting in non-linear error of test results
In addition, when measuring from the neutral point, if a single-phase ground fault occurs in the system, it will cause the neutral point voltage to rise to the phase voltage, which will cause work safety risks

Method used

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  • Novel power distribution network capacitance and current measurement method and system
  • Novel power distribution network capacitance and current measurement method and system
  • Novel power distribution network capacitance and current measurement method and system

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Embodiment 1

[0029] figure 1 It is a flow chart of the new method for measuring the capacitive current of the distribution network of the present invention. Such as figure 1 As shown, the present invention provides a novel distribution network capacitive current measurement method, the method comprising the following steps:

[0030] S1: The measurement mode of the receiving configuration of the capacitance current tester.

[0031] In this step, the capacitive current tester has a PT opening triangulation function and output short circuit, output open circuit, and zero sequence voltage abnormal judgment functions, and supports the selection of multiple measurement methods. The multiple measurement methods include: 1PT measurement inside the machine , External 1PT, 3PT, 4PT measurement.

[0032] Before the test, the staff first configure the measurement mode of the capacitive current tester through the man-machine interface. Among them, the maximum output test current of the capacitive cu...

Embodiment 2

[0047] Figure 4 It is a structural schematic diagram of the novel distribution network capacitive current measurement system of the present invention. Such as Figure 4As shown, the present invention also provides a novel distribution network capacitive current measurement system, which includes a capacitive current tester and a remote controller;

[0048] The measurement mode of the receiving configuration of the capacitive current tester;

[0049] The capacitive current tester receives the control signal sent by the remote controller, measures the capacitive current according to the control signal, and obtains the measurement result;

[0050] The capacitive current tester displays and outputs the measurement results.

[0051] Preferably, the capacitive current tester is integrated with a 10kV voltage transformer to measure the capacitive current through the neutral point. The 10kV voltage transformer adopts an indoor JDZ10-10 type voltage transformer with a transformatio...

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Abstract

The invention relates to a novel power distribution network capacitance and current measurement method and system. The method comprises the following steps that: S1, a capacitance and current tester receives a configured measurement mode; S2, the capacitance and current tester receives a control signal sent by a remote controller, and measures the capacitance and current according to the control signal to obtain a measurement result; and S3, the capacitive current tester displays and outputs the measurement result. According to the invention, a 10 kV voltage transformer is integrated in the tester, the capacitance and the current are measured through a neutral point, and thus the nonlinear error of the measurement result caused by the use of different voltage transformers is avoided. Meanwhile, the tester has an open triangulation function and a remote control measurement function, supports flexible selection of measurement modes, and is high in measurement efficiency and low in safetyrisk.

Description

technical field [0001] The invention belongs to the field of electric power automation testing, and in particular relates to a novel method and system for measuring capacitance current of a power distribution network. Background technique [0002] At present, the method of measuring the capacitive current of the distribution network is mainly to use a capacitive current tester to measure from the opening triangle of the PT cabinet or from the neutral point of the main transformer (or station transformer) plus PT. Before and after the PT open triangulation measurement, it is necessary to exit / restore the relevant protection, and also to exit the harmonic elimination resistor once, which will cause cumbersome operations such as PT stop and power transmission, involving the cooperation of many professionals such as operation, protection, measurement, and maintenance. , The efficiency is low, and it often takes half a day or even a day to measure the capacitance current of a dis...

Claims

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Application Information

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IPC IPC(8): G01R31/52G01R31/54G01R31/08G01R19/00
CPCG01R31/52G01R31/54G01R31/086G01R19/00
Inventor 吕泽承裴云庆田树军王飞风蒋圣超
Owner GUANGXI POWER GRID ELECTRIC POWER RES INST
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