Lightning overvoltage monitoring system for substation secondary system

A lightning strike overvoltage, secondary system technology, applied in the direction of using digital measurement technology for measurement, can solve the problems of large dispersion of overvoltage waveform and short duration, and achieve the effect of ensuring safe and normal operation

Inactive Publication Date: 2015-09-30
ZHONGSHAN POWER SUPPLY BUREAU OF GUANGDONG POWER GRID
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the secondary system is a weak current system. Due to the large dispersion of the overvoltage waveform and the short duration, the overvoltage online monitoring technology for the primary s

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  • Lightning overvoltage monitoring system for substation secondary system
  • Lightning overvoltage monitoring system for substation secondary system
  • Lightning overvoltage monitoring system for substation secondary system

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Embodiment Construction

[0013] In order to better understand the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved, the specific implementation of the system of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0014] Such as figure 1 As shown, a substation secondary system lightning strike overvoltage monitoring system includes a low-damping resistance-capacity series voltage divider 100, a resistance-capacity parallel voltage divider 200, a trigger circuit 300, a signal processing circuit 400, a data acquisition card 500, and a background machine 600; the input end of the resistance-capacitance parallel voltage divider 200 is connected with the output end of the low-damping resistance-capacity series voltage divider 100, and the output end is respectively connected with the input end of the trigger circuit 300 and the input end of the signal processing circuit 400; one end of t...

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Abstract

A lightning overvoltage monitoring system for a substation secondary system is characterized in that a low-damping series resistance-capacitance divider acquires a surge overvoltage signal, a parallel resistance-capacitance divider divides voltage of the surge overvoltage signal, voltage amplitude of surge overvoltage is lowered, part of an overvoltage division signal enters a trigger circuit for overvoltage judging, whether overvoltage signal acquisition is required or not is determined, the other part of the overvoltage division signal enters a signal processing circuit for impedance isolation and low-pass filtering, when triggered, a data acquisition card acquires an overvoltage signal output by the signal processing circuit and transmits the overvoltage signal to a background computer for overvoltage waveform statistics and analysis, action reliability of an arrestor is judged according to analysis results, maintenance for the arrestor of the substation secondary system is thus guided, and running safety and normality of the substation secondary system is ensured.

Description

technical field [0001] The invention relates to the technical field of overvoltage on-line monitoring, in particular to a lightning strike overvoltage monitoring system for a substation secondary system. Background technique [0002] Overvoltage refers to the long-term voltage fluctuation phenomenon that the root mean square value of the AC voltage rises under power frequency, exceeds 10% of the rated value, and lasts for more than 1 minute. Overvoltage is divided into two categories: external overvoltage and internal overvoltage, and external overvoltage is lightning overvoltage. In order to prevent lightning overvoltage from damaging the primary equipment and secondary equipment of the substation, lightning arresters are generally installed on the primary system of the substation, and surge arresters are installed on the secondary system. Since there are many control and protection devices in the substation, the lightning arrester is installed at the entrance of the power...

Claims

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Application Information

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IPC IPC(8): G01R19/25
Inventor 徐春新梁国坤谭容芬马广明洪毅文李新海周桂袁拓来
Owner ZHONGSHAN POWER SUPPLY BUREAU OF GUANGDONG POWER GRID
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