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Measuring method for leakage current of zinc oxide arrester

A technology of leakage current and measurement method, which is applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve problems such as general economy, impossibility, and damage to invisible equipment, so as to improve measurement accuracy, avoid safety hazards, and improve The effect of work efficiency

Inactive Publication Date: 2017-03-15
STATE GRID CORP OF CHINA +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of the two-terminal grounding method are: first, the data accuracy is poor, and the parallel voltage value of the two resistances can only be read at the same time. When the two resistances break down out of sync, the current will rise sharply and the measurement cannot be carried out; Invisible equipment damage risk, economical in general; third, poor promotion, can only be used in 220kV arrester test, can not be used in 500kV arrester test
The disadvantages of the upper and lower shielding method are: when the resistance of the lower section breaks down before the upper section, it will cause the current to rise sharply and make the measurement impossible

Method used

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  • Measuring method for leakage current of zinc oxide arrester
  • Measuring method for leakage current of zinc oxide arrester
  • Measuring method for leakage current of zinc oxide arrester

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Embodiment Construction

[0019] Such as Figure 1 to Figure 3 Shown: the zinc oxide arrester leakage current measurement method of this embodiment includes the following steps:

[0020] A: Connect the high voltage output terminal of the DC high voltage generator to the "-" terminal of the first DC ammeter, and connect the "+" terminal of the first DC ammeter to the connection point of the upper section lightning arrester and the lower section lightning arrester. The voltage test terminal of the generator is connected to a DC microammeter, and the terminal of the DC high voltage generator is grounded.

[0021] B: Connect the voltage divider resistor with the resistance value of 25kΩ~35kΩ in parallel with the discharge counter and connect it to the lower end of the lightning arrester in the lower section, and the end of the voltage divider resistor is grounded; the setting of the voltage divider resistor increases the operating voltage of the arrester in the lower section and makes it flow through the lower ...

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Abstract

The invention discloses a measuring method for a leakage current of a zinc oxide arrester. The measuring method comprises the steps of: connecting a high-voltage output end of a DC high voltage generator with a ''-'' wiring end of a first DC ammeter, connecting a ''+'' wiring end of the first DC ammeter to a joint of an upper segment lightning arrester and a lower segment lightning arrester, connecting a voltage testing end of the DC high voltage generator with a DC microammeter, and grounding the tail end of the DC high voltage generator; connecting a voltage-dividing resistor with a resistance value ranging from 25 kilo-ohm to 35 kilo-ohm with a discharge counter in parallel and then connecting the voltage-dividing resistor with the lower end of the lower segment lightning arrester, and grounding the tail end of the voltage-dividing resistor; disconnecting the lower segment lightning arrester from the discharge counter, initiating the DC high voltage generator, and taking the reading of the DC microammeter as 1mA voltage of the upper segment lightning arrester when the reading of the first DC ammeter reaches 1mA. The measuring method avoids the potential safety hazards of high-altitude disconnection and connection of high-voltage lead wire operation, and improves the working efficiency and measurement precision.

Description

Technical field [0001] The invention relates to a current measurement method, in particular to a zinc oxide lightning arrester leakage current measurement method. Background technique [0002] Due to the large number of installations and scattered locations, the annual preventive test of the arrester is generally to remove the lead of the arrester, and then install and use the arrester after passing the test. The health of the arrester is tested through the test, which is time-consuming and labor-intensive, and many Under the circumstances, there are great safety hazards when high-altitude disassembly and connection of high-voltage leads are carried out on transmission lines with high voltage levels. The conventional test method is to remove the high-voltage lead of the arrester to check the contamination of the outer surface of the zinc oxide arrester (MOA) and clean it in time, check the primary lead of the zinc oxide arrester and the ground down conductor, check the safety dis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/165G01R31/02
CPCG01R19/16571G01R31/50
Inventor 邓旭东高家志李娜刘航陈勇唐巾鸿
Owner STATE GRID CORP OF CHINA
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