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Method and system for measuring transient overvoltage of high voltage power network through distribution capacitance method

A grid transient and capacitance method technology, applied in the direction of measuring current/voltage, measuring electrical variables, voltage/current isolation, etc., can solve problems such as the safety impact of workers, and achieve the effect of effective monitoring means

Active Publication Date: 2012-11-21
STATE GRID ELECTRIC POWER RES INST
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Problems solved by technology

This method needs to lead out the wires at the end of the transformer, and the staff must climb up the transformer for installation, which has a certain impact on the safety of the staff

Method used

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  • Method and system for measuring transient overvoltage of high voltage power network through distribution capacitance method
  • Method and system for measuring transient overvoltage of high voltage power network through distribution capacitance method
  • Method and system for measuring transient overvoltage of high voltage power network through distribution capacitance method

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Embodiment Construction

[0036] A method for measuring the transient overvoltage of the power grid by using the distributed capacitance method of the present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0037] figure 2 Instructions marked in the middle: 1-A phase high voltage wire, 2-B phase high voltage wire, 3-C phase high voltage wire, 4-A phase low voltage arm electrode, 5-B phase low voltage arm electrode, 6-C phase low voltage arm electrode, 7-A phase low voltage capacitor, 8-B phase low voltage capacitor, 9-C phase low voltage capacitor;

[0038] image 3 Explanation of the middle mark: 10-(between the low-voltage arm electrode of phase A and the high-voltage wire of phase A)A-A distributed capacitance, 11-(between the low-voltage arm electrode of phase A and the high-voltage wire of phase B)A-B distributed capacitance, 12-( A-C distributed capacitance between the low-voltage arm electrode of phase A and high-voltage wire of pha...

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Abstract

The invention relates to a method and a system for measuring transient overvoltage of a high voltage power network through a distribution capacitance method. The system is characterized by comprising a high voltage capacitor, a capacitive voltage divider and a low voltage arm measuring device of the capacitive voltage divider, wherein the high voltage capacitor consists of a distributing capacitor formed between a high voltage wire and a low voltage arm electrode arranged below the high voltage wire. The low voltage arm electrode is electrically connected with a low voltage capacitor to form the capacitive voltage divider. The low voltage arm measuring device of the capacitive voltage divider consists of a coaxial cable and an oscilloscope. The low voltage capacitor of the capacitive voltage divider is connected with the oscilloscope through the coaxial cable. The low voltage arm measuring device is characterized in that three low-voltage arm electrodes are arranged below a three-phase conducting wire. Nine distributed capacitors are formed by the three low-voltage arm electrodes and the three-phase conducting wire. Three low-voltage arm electrode and three low-voltage capacitors together form a three-phase capacitive voltage divider. The relationship between a 3*1 matrix [U1] formed by a three-phase high voltage and a 3*1 matrix [U2] formed by the secondary output voltage of the three-phase capacitive voltage divider is [U2]3*1=[K] 3 *3. [U1]3*1. The invention can more flexibly and conveniently measure the transient overvoltage of the power network.

Description

technical field [0001] The invention relates to a method and system for measuring the transient overvoltage of a high-voltage power grid, which can be used for the measurement of the transient overvoltage of the power grid of 1000kV and below, and can be used for online monitoring and protection of the transient overvoltage of the power grid of 1000kV and below, so as to ensure the safety of the power system Operation provides monitoring means. Background technique [0002] Power system overvoltage is an important issue that must be solved in the development of high-voltage and ultra-high-voltage power grids. It is not only related to the reasonable design of the insulation strength of power equipment such as generators, transformers, and transmission lines, but also directly affects the safe operation of the power system. In the analysis of blackout accidents at home and abroad, it is found that the failure rate of power grid accidents caused by power system overvoltage is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R19/165G01R15/16
Inventor 王晓琪李璿吴士普余春雨汪本进陈晓明毛安澜王玲费晔冯宇陈心佳王欢
Owner STATE GRID ELECTRIC POWER RES INST
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