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Lightning arrester experimental device and method based on volt-ampere characteristic deviation

A technology of volt-ampere characteristics and test equipment, which is applied in the direction of measuring devices, instruments, and measuring electronics, can solve problems such as inaccurate test data and volt-ampere characteristic deviation, so as to improve accuracy, increase starting voltage, reduce The effect of capacity

Pending Publication Date: 2018-02-23
QINZHOU POWER SUPPLY BUREAU OF GUANGXI POWER GRID CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a lightning arrester test device and method based on volt-ampere characteristic deviation, which solves the problem of inaccurate test data existing in the prior art

Method used

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  • Lightning arrester experimental device and method based on volt-ampere characteristic deviation
  • Lightning arrester experimental device and method based on volt-ampere characteristic deviation
  • Lightning arrester experimental device and method based on volt-ampere characteristic deviation

Examples

Experimental program
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Effect test

Embodiment 1

[0039] When conducting the bus arrester test, disconnect the N terminal of the bus voltage transformer PT primary winding and the bus PT interval grounding knife switch, and connect a DC high voltage generator between the upper and lower arresters to apply pressure to the arrester to be tested. Take the two-section surge arrester test as an example to illustrate.

[0040] When carrying out the test of the arrester in the next section, the main switch is toggled to contacts 3 and 4, the switch K2 of the next section is turned on, and the voltage of the DC high voltage generator is increased until the value indicated by the ammeter A2 of the next section reaches 1mA, and the DC high voltage at this time is read. The voltage value U3 of the generator; reduce the voltage of the DC high-voltage generator to 75% of U3, and read the current value I3 of the ammeter A2 in the next section at this time. At this time, U3 and I3 are test data, which are used to judge whether there is a de...

Embodiment 2

[0043] When carrying out the arrester test on one of the three sides of the main transformer, disconnect the neutral point grounding switch and the main transformer grounding switch of the arrester on the three sides of the main transformer. Take the two-section surge arrester test as an example to illustrate.

[0044] When carrying out the test of the arrester in the next section, the main switch is toggled to contacts 3 and 4, the switch K2 of the next section is turned on, and the voltage of the DC high voltage generator is increased until the value indicated by the ammeter A2 of the next section reaches 1mA, and the DC high voltage at this time is read. The voltage value U5 of the generator; reduce the voltage of the DC high-voltage generator to 75% U5, and read the current value I5 of the ammeter A2 in the next section at this time. At this time, U5 and I5 are test data, which are used to judge whether there is a defect in the arrester in the next section.

[0045] When ...

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Abstract

The invention provides a lighting arrester experimental device and method based on volt-ampere characteristic deviation. A corresponding experimental circuit is arranged for each segment of lightningarrester, and each experimental circuit is provided with a piezoresistor, a switch and an ampere meter. When any one segment of the lightning arrester is tested, only the switch of the lightning arrester is switched off, and the switches of other segments of the lightning arresters are normally switched on; the circuits where the switches are kept switched on normally are equivalent to the situation that the piezoresistors are accessed, compared with the situation that no piezoresistor is accessed, the volt-ampere characteristic is deviated overall, the starting voltage is improved, so that the tested segment of the lightning arrester of is conductively connected ahead of other segments of the lightning arresters, and thus the experiment of the lightning arrester is not influenced by the existence of other segments of the lightning arresters; the accuracy of experimental data is improved, and whether or not defects exist in the segments of the lightning arresters can be judged more accurately.

Description

technical field [0001] The invention relates to a defect detection device of a lightning arrester, in particular to a lightning arrester test device and method based on volt-ampere characteristic deviation. Background technique [0002] Surge arresters usually include zinc oxide arresters on three sides of the main transformer and zinc oxide arresters on the busbar. When the arrester fails, it will cause a large-scale power outage, seriously affecting life and production. [0003] In the prior art, the double-meter method is used to conduct a power failure test on two or more lightning arresters without disconnecting the wires: the top of the upper lightning arrester is grounded, the bottom of the lower lightning arrester is equipped with a counter, and the microampere meter is connected in series. A high-voltage microammeter and a DC high-voltage generator are connected in series at the junction of the surge arrester. During the test, the value of the microammeter is subtra...

Claims

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Application Information

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IPC IPC(8): G01R31/00
CPCG01R31/00
Inventor 黄瑞艺翁冬妮李幸蔚韦巍李昌冯波
Owner QINZHOU POWER SUPPLY BUREAU OF GUANGXI POWER GRID CO LTD
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