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Lightning arrester resistive current testing sensor

A technology of resistive current and lightning arrester, applied in the electronic field, to achieve strong anti-interference ability, ensure safe operation, and facilitate online detection

Inactive Publication Date: 2017-02-22
CHANGZHOU INST OF LIGHT IND TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] However, there is currently no MOA arrester with reliable detection

Method used

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  • Lightning arrester resistive current testing sensor
  • Lightning arrester resistive current testing sensor
  • Lightning arrester resistive current testing sensor

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Embodiment Construction

[0034] The present invention will be described in detail below in conjunction with specific embodiments.

[0035] Such as figure 1 As shown, a resistive current test sensor for an arrester includes a single-turn core-through current sensor circuit, the single-turn core-through current sensor circuit is connected to the power-taking line, and a bidirectional transient suppression diode is set in the single-turn core-through current sensor circuit , which plays the role of overvoltage protection, is provided with resistors R1 and R6 which convert the current signal into a voltage signal and divide the voltage for sampling, and are provided with diodes D1 and D2 which clamp the sampling voltage, and are used for instantaneous lightning strike overvoltage Rectified diode D3, diode D4, diode D5, diode D6, LM358 dual operational amplifier, the LM358 dual operational amplifier is used to regulate the rectified voltage, and the LM358 dual operational amplifier includes two independent...

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PUM

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Abstract

A lightning arrester resistive current testing sensor belongs to the field of electronic technology. The lightning arrester resistive current testing sensor comprises a single-turn straight-through current sensor circuit. The single-turn straight-trough current sensor circuit is connected with an electric power acquisition line. The single-turn straight-through current sensor circuit is provided with a bidirectional transient voltage suppressor which performs an overvoltage protection function; a resistor R1 and a resistor R6 which convert a current signal to a voltage signal and perform voltage dividing sampling; a diode D1 and a diode D2 which perform clamping on the sampled voltage; diodes D3, D4, D5, D6 which are used for performing rectification on an instantaneous lightning overvoltage; an LM358 dual operational amplifier which is used for conditioning the rectified voltage; and a CPU which counts number of action times of the lightning arrester. The lightning arrester resistive current testing sensor improves detection accuracy of an MOA lightning arrester sensor and furthermore has advantages of high interference resistance, high stability and high convenience in online detection.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to a resistive current test sensor for a lightning arrester. Background technique [0002] In the power system, in order to ensure safe power supply, surge arresters are usually used in high-voltage transmission lines to protect against lightning and operating overvoltages. Since the appearance of metal oxide surge arresters (MOA for short) in the early 1970s, Its excellent characteristics have gradually replaced the traditional SiC surge arresters, and are widely put into operation in power grids of various voltage levels. [0003] MOA has the following advantages: [0004] 1) Good protection characteristics [0005] MOA has good non-linear characteristics, showing a high resistance value under normal working voltage, and the current passing through it is only microampere level, which is close to the insulation state; when the voltage applied to it exceeds the reference volta...

Claims

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Application Information

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IPC IPC(8): G01R31/00G01R31/02G01R19/00
CPCG01R19/0092G01R31/00G01R31/50
Inventor 陈晓林
Owner CHANGZHOU INST OF LIGHT IND TECH
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