Zinc oxide arrester live detection device free of external connection with alternating-current power supply

A technology of AC power supply and live detection, which is applied in the direction of using digital measurement technology for measurement, etc. It can solve problems such as the lack of AC power supply, the inability of lightning arresters to carry out live test, and the power supply cannot be replaced by generators, so as to improve measurement efficiency and accuracy. , low cost and low maintenance cost

Inactive Publication Date: 2014-05-07
STATE GRID CORP OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For arresters installed outside the substation area, especially a large number of arresters installed on towers to protect cables, the site does not have the AC power require

Method used

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  • Zinc oxide arrester live detection device free of external connection with alternating-current power supply
  • Zinc oxide arrester live detection device free of external connection with alternating-current power supply
  • Zinc oxide arrester live detection device free of external connection with alternating-current power supply

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Effect test

Embodiment 1

[0027] The invention relates to a live detection device for a zinc oxide arrester without an external AC power supply. The detection device is used for detecting the operating parameters of a three-phase gapless zinc oxide arrester in the operation of an electric power system.

[0028] The device adopts a modular design scheme, such as figure 1 As shown, there is a current acquisition unit 1, and the current acquisition unit 1 is divided into A phase, B phase, and C phase. The functions and principles of the three phases are exactly the same. The leakage current is collected and the I / V conversion is performed by the I / V conversion circuit 12. After the converted voltage signal is amplified by the amplification unit 2, the A / D conversion is performed by the single-chip microcomputer 3, and then through the display after calculation and data correction. 5 to display and print through the printer 6, and the function setting in the process is completed by the keyboard 4.

[0029...

Embodiment 2

[0032] In order to verify the practicability of the present invention, a large number of on-site live tests were carried out on the developed instrument in Shenyang, Liaoning Province in 2013. The test process adopts the present invention that does not require an external power supply and the RCD that requires an external AC power supply for many field applications. -6 type zinc oxide arrester electrification tester for on-site comparison test, the principle and method of the two instruments are the resistive current angle phase difference method, the tested arrester is 220kV voltage level, and the arrangement of the arrester is linear and triangular respectively. The measurement results are as follows Shown in Table 1 and Table 2.

[0033] From the test data, the test data of the two instruments are very close and have the same trend, so it can be seen that the present invention can meet the needs of on-site measurement.

[0034] Table 1 Comparative test data of arresters arran...

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Abstract

The invention belongs to the technical field of gapless zinc oxide arrester live detection in an electric system, in particular to a zinc oxide arrester live detection device free of external connection with an alternating-current power supply. The zinc oxide arrester live detection device free of external connection with the alternating-current power supply comprises a current collecting unit, an amplifying unit, a single-chip microcomputer, a keyboard, a displayer and a printer. The current collecting unit has the A-phase, the B-phase and the C-phase, wherein the A-phase, the B-phase and the C-phase of the current collecting unit are connected with the amplifying unit. The output end of the amplifying unit is connected with an A/D conversion channel of the single-chip microcomputer. A bus of the single-chip microcomputer is connected with the keyboard, the displayer and the printer in sequence. The zinc oxide arrester live detection device free of external connection with the alternating-current power supply can complete on-site detection of three-phase arresters at the same time in one-time measurement and has the remarkable advantages that testing operation is convenient, site interference is small, and data repeatability is good; the zinc oxide arrester live detection device free of external connection with the alternating-current power supply further has the remarkable advantages of being suitable for arrester live tests under different site conditions in a transformer substation and out of the transformer substation, capable of accurately judging the operation state of the arresters, high in measurement accuracy, wide in application range, convenient to use and low in maintenance cost.

Description

Technical field [0001] The invention belongs to the technical field of live detection of gapless zinc oxide arresters in electric power systems, and in particular relates to a live detection device for zinc oxide arresters without an external AC power supply, which is a device for live detection of zinc oxide arresters in operation. Background technique [0002] Gapless zinc oxide surge arresters, hereinafter referred to as arresters, have been widely used in power systems. Measuring the AC leakage current of the arrester under the operating voltage can reflect the operating state of the arrester to a certain extent. Under normal operating conditions, the current flowing through the arrester is mainly capacitive current, and the resistive current only accounts for a small part, about 10% to 20%. When the valve plate is aging, the arrester is damp, the internal insulating parts are damaged, and the surface is seriously polluted, the capacitive current does not change much, b...

Claims

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Application Information

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IPC IPC(8): G01R19/25
Inventor 韩芳陈瑞国付殿涛邓德刚杨斌郑舒文
Owner STATE GRID CORP OF CHINA
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