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Method of using 220V power supply to carry out on-line monitoring on arrester resistance current

A technology of power supply and resistive current, applied in the field of arrester online monitoring system, can solve the problems of short circuit danger and inconvenient installation, and achieve the effect of prolonging the life, reducing the failure rate of the device, and reducing the maintenance workload.

Active Publication Date: 2017-03-08
国网河南省电力公司超高压公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention provides a method for using 220V power supply to monitor the resistive current of the arrester on-line, which solves the problems of inconvenient installation and short-circuit risk in the selection of the secondary reference voltage of the PT in the resistive current on-line monitoring system of the arrester in the prior art

Method used

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  • Method of using 220V power supply to carry out on-line monitoring on arrester resistance current
  • Method of using 220V power supply to carry out on-line monitoring on arrester resistance current
  • Method of using 220V power supply to carry out on-line monitoring on arrester resistance current

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Embodiment 1

[0046] In April 2015, the Zhengzhou 500KV substation of the maintenance company of the State Grid Henan Electric Power Company adopted a method of using the 220V power supply to monitor the resistive current of the arrester online, and compared it with the secondary voltage monitoring of the PT, and displayed the results in real time All are the same, randomly selected as the data at 18:52:53 on April 25, as follows:

[0047]

[0048]

Embodiment 2

[0050] In April 2015, the Zhengzhou 110kV substation of the State Grid Zhengzhou Power Supply Company adopted a method of using the 220V power supply to monitor the resistive current of the arrester online, and compared it with the secondary voltage monitoring of the PT. The real-time display results were the same. Randomly select the data at 11:44:31 on April 20, as follows:

[0051]

[0052]

[0053] To sum up, the monitoring data results shown in Example 1 show that no abnormality occurs; the monitoring data results shown in Example 2 show that the comprehensive performance evaluation of phase A and phase C of the arrester is inferior and needs to be repaired.

[0054] Using the 220V power supply as the reference voltage after compensation and correction, the obtained monitoring data is the same as the PT secondary voltage as the reference voltage for online monitoring of the resistive current of the arrester, and the installation and operation of the arrester online m...

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Abstract

The invention provides a method of using a 220V power supply to carry out on-line monitoring on an arrester resistance current. The method comprises the following steps of 1) adjusting an on-line monitoring condition through a supply voltage; 2) simultaneously, taking a PT secondary voltage and a 220V power supply voltage in a transformer substation as reference voltages and acquiring a current voltage angle phi and a real-time current voltage angle phi 1 respectively; 3) taking an acquired angle of phi-phi 1 as a constant angle, correcting constantly, and converting real-time data of the 220V power supply voltage into a PT secondary voltage real-time data; 4) through the corrected data in the step3 and a MOA current signal, converting and acquiring a voltage fundamental wave U1, a current fundamental wave peak value 1*1p and the current voltage angle phi; and 5) through the current voltage angle phi and a resistive-current fundamental wave peak value Ir1p, determining MOA performance. By using the above scheme, problems that an installation is not convenient and a short circuit risk exists when an arrester resistance current on-line monitoring system selects a PT secondary reference voltage are solved.

Description

technical field [0001] The invention relates to the technical field of electric power online monitoring, in particular to an online monitoring system for lightning arresters. Background technique [0002] Surge arrester is an important primary equipment in power production in the power industry. Its main function in substations (boosting and stepping down stations) and lines is to protect other equipment from lightning overvoltage and system surge overvoltage. Since the 1980s, metal oxide arresters (MOA) have gradually replaced SiC arresters. Due to the good volt-ampere characteristics of metal oxide arresters, the protection level of major equipment in power production has made a qualitative leap. With the popularization of MOA, its operation status has been paid more and more attention by the industry. [0003] Most of the zinc oxide arresters used in substations around the world no longer have series gaps. During the operation of MOA, there is always a certain leakage cu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/04G01R31/02
Inventor 王敏王校丹鲁永李钊李忠民杨光姚孟崔凤庆张利武臻叶少坤
Owner 国网河南省电力公司超高压公司
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