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On-line monitoring device of metallic oxide arrester

A monitoring device and oxide technology, applied in the direction of measuring devices, instruments, measuring electricity, etc., can solve the problems of low accuracy of measurement results and inability to obtain the operating status of arresters in real time.

Active Publication Date: 2009-12-16
XI AN JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Aiming at the high detection sensitivity of the electromechanical monitoring instrument in the prior art, but it is impossible to obtain the operating state of the arrester in real time, and the current transformer instrument has the technical problem of low measurement accuracy due to the use of a through-hole current transformer, the present invention The following technical solutions are proposed:

Method used

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  • On-line monitoring device of metallic oxide arrester

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Embodiment Construction

[0011] Referring to accompanying drawing 1, in the figure protection circuit 1 is made up of varistor sheet 11 and choke coil 7. The upper end of the varistor sheet 11 is connected to the metal oxide arrester 6 and the lower end is grounded. The choke coil 7 is connected in series with the operation times detection unit 2 and the leakage current sampling unit 3 , and then connected in parallel with the piezoresistor sheet 11 . The number of actions detection unit 2 is composed of a rectifier bridge 8, a voltage dividing resistor, a Schottky diode and an optocoupler 9 to realize the measurement of the number of actions. The first resistor R 1 and the second resistor R 2 Connected in series to form a voltage divider circuit, connected in parallel at both ends of the filter capacitor.

[0012] Leakage current sampling unit 3 realizes leakage current measurement, and described leakage current sampling unit is made up of current transformer, is 1: 1 current transformer and bidire...

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Abstract

The invention belongs to the technical field of electric power on-line monitoring, relating to an on-line monitoring device of a metallic oxide arrester. The on-line monitoring device comprises a protecting circuit, a movement time detecting unit, a leakage current sampling circuit and a collecting board, wherein, the upper end of a varistor in the protecting circuit is connected with a metal oxide arrester (MOA), and the lower end thereof is grounded; the movement time detecting unit is connected with a leakage current sampling unit in series and then is connected with an output end of the choke coil in the protecting circuit; an output end of the movement time detecting unit is connected with one path of input end of the collecting board; an output end of the leakage current sampling unit is connected with the other path of input end of the collecting board; the collecting board is used for collecting signals and realizing on-site display and data remote transmission; a computer monitoring center collects information from the collecting board so as to carry out analysis treatment and fault alarming.

Description

technical field [0001] The invention belongs to the technical field of electric power on-line monitoring, and relates to an on-line monitoring device for a lightning arrester. Background technique [0002] Metal oxide surge arresters are important overvoltage protection devices in power systems. In recent years, with the wide application of metal oxide surge arresters, the safety of their own operation has become a concern in power systems. In order to be able to understand the operation status of metal oxide arresters in time, the monitoring technology and monitoring devices for metal oxide arresters have also been developed accordingly. The most widely used type of monitoring device at present is the electromechanical instrument for on-site monitoring, which is composed of an electromagnetic DC mA meter and a counter, and is used to monitor the leakage current and the number of operations of the metal oxide arrester. The advantage of this device is that the leakage curre...

Claims

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Application Information

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IPC IPC(8): G01R31/00
Inventor 张冠军穆海宝郭一欣韩政
Owner XI AN JIAOTONG UNIV
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