Overvoltage on-line monitoring device and method

A monitoring device and overvoltage technology, applied in the field of power system, can solve the problems of increasing the cost of communication equipment and reducing the safety of the primary system.

Inactive Publication Date: 2014-05-28
NINGHAI COUNTY POWER SUPPLY BUREAU +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The methods for acquiring voltage signals of overvoltage on-line monitoring devices in the prior art mainly include capacitive voltage divider or resistance-capacitance voltage divider, optical fiber voltage sensor, end-screen voltage sensor based on capacitive bushing, and non-contact type based on electrostatic couplin...

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  • Overvoltage on-line monitoring device and method
  • Overvoltage on-line monitoring device and method

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Embodiment Construction

[0016] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but the present invention is not limited to the following specific embodiments.

[0017] As shown in the figure: an overvoltage on-line monitoring device, including a voltage transformer connected to the high-voltage bus, a capacitor voltage divider connected to the voltage transformer through a cable, a data acquisition card connected to the capacitor voltage divider, and a data acquisition card connected industrial computer. The voltage transformer and cables are original in the substation, and the capacitive voltage divider, data acquisition card and industrial computer are additional equipment.

[0018] A kind of overvoltage online monitoring method, it comprises the following steps:

[0019] (1) Use the voltage transformer that comes with the substation to collect the voltage signal on the high-voltage bus;

[0020] (2) The collected volta...

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Abstract

The invention relates to the field of an electric power system and particularly relates to an overvoltage on-line monitoring device and method. The device comprises a voltage transformer connected with a high-voltage bus, a capacitive divider connected with the voltage transformer through a cable, a data collection card connected with the capacitive divider and an industrial control computer connected with the data collection card. The method comprises: (1), utilizing a voltage transformer carried by a transformer station itself to acquire voltage signals on a high-voltage bus; (2), transmitting the acquired voltage signals through a cable, next, performing voltage dividing again through a divider, then forming sampling signals by using a data collection card to perform sampling, and sending the sampling signals to an industrial control computer; and (3), the industrial control computer converting the sampling signals into voltages at the high-voltage side of the voltage transformer by use of an inversion calculating method combining time domain recursion convolution and a vector coupling method. By using the system provided by the invention, the cost is low, and the safety is high.

Description

technical field [0001] The invention relates to the field of power systems, in particular to an overvoltage online monitoring device and method. Background technique [0002] Modern power system operation experience and research have shown that overvoltage is the main cause of grid insulation damage accidents, and is also a decisive factor in selecting the insulation strength of electrical equipment. Although the power system has a series of overvoltage protection measures such as lightning rods, lightning wires, lightning arresters and lightning protection grounding (grounding grid), overvoltage phenomena still occur from time to time and cause a series of accidents such as breakdown, discharge, flashover, and explosion of electrical equipment. . Overvoltage online monitoring can realize online capture and real-time analysis of overvoltage waveforms, and provide real first-hand data for overvoltage accident inversion and treatment and numerical simulation research. Theref...

Claims

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Application Information

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IPC IPC(8): G01R19/165
Inventor 王激华谢狄辉余敏薛红邬剑锋柏帆戴琳霄
Owner NINGHAI COUNTY POWER SUPPLY BUREAU
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