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Insulator series-parallel gap lightning impulse effectiveness and discharge characteristic test method

A technology of insulator strings and lightning strikes, applied in the direction of testing dielectric strength, using optical methods to test, measuring electricity, etc., can solve problems such as loss, insulator series-parallel gap lightning strike failure, etc.

Active Publication Date: 2016-12-07
STATE GRID ZHEJIANG ELECTRIC POWER CO LTD JINHUA POWER SUPPLY CO +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the invention is: in view of the current insulator series-parallel gap lightning shock failure problem, that is: the power frequency arc formed after the lightning flashover occurs is not far away from the surface of the insulator string, and there is no air between the upper and lower electrodes in the parallel gap Instead of burning in the middle of the insulator string, it loses the function of the parallel gap to guide the power frequency arc. A test method for the effectiveness of the lightning impulse and the discharge characteristics of the insulator series-parallel gap is proposed.

Method used

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  • Insulator series-parallel gap lightning impulse effectiveness and discharge characteristic test method
  • Insulator series-parallel gap lightning impulse effectiveness and discharge characteristic test method

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Embodiment 1

[0036] A method for testing the effectiveness and discharge characteristics of insulator series-parallel gap lightning impulse, comprising the following steps:

[0037] (1) The main processor controls the impulse voltage generator to test the series-parallel gap of insulators according to the test principle of the lifting method, and obtains the 50% discharge voltage U 50％ , the maximum value of the voltage setting of the impulse voltage generator during the lifting process is denoted as U m ;

[0038] (2) The main processor sets the voltage of each stage of the impulse voltage generator to U 1 =(U m +△U 1 ), the magnitude of the lightning impulse voltage generated at this time is greater than U 50％ , the amplitude of the lightning impulse voltage is such that the insulator series-parallel gaps flashover each time it is impacted, and N times of impacts are performed, 5≤N≤10; the main processor records the breakdown time and voltage peak value of each impact, Provide data ...

Embodiment 2

[0055] Such as figure 1 , a method for testing the effectiveness and discharge characteristics of insulator series-parallel gap lightning impulse. Before the test starts, the test equipment and samples must be prepared. 500kV line insulator series-parallel gap lightning impulse effectiveness and lightning impulse 50% discharge voltage U 50％ , Volt-second characteristic (V-s) integrated test is carried out by 7200kV impulse voltage generator, which is composed of 25 stages, each stage has a charging voltage of ±300kV, a charging capacitor of 3μF, and can generate a maximum amplitude of ±7500kV Standard lightning impulse voltage full wave. The voltage divider adopts a low-damping capacitor voltage divider with a voltage division ratio of 4898. The measurement system is compared with the national high-voltage metering station, and the total uncertainty of the measured voltage peak value is within ±3%. Both of them meet the test requirements of the GB / T16927.1-1997 "High Voltage...

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Abstract

The invention relates to an insulator series-parallel gap lightning impulse effectiveness and discharge characteristic test method. According to the method, a lift test principle method and a forcing test method are applied through a main processor and image acquisition; lightning impulse 50% discharge voltage, a lightning impulse volt-second characteristic and the effectiveness and invalidity of an insulator series-parallel gap can be simultaneously acquired; and the effective application of a parallel gap in the lightning protection of a transmission line is enhanced.

Description

【Technical field】 [0001] The invention relates to the field of testing, in particular to a method for testing the effectiveness and discharge characteristics of insulator series-parallel gap lightning impulse. 【Background technique】 [0002] So far, lightning strikes are still an important factor that endangers the safe operation of transmission lines and affects the reliable power supply of the power grid. With the continuous improvement of the grid structure and the wide application of automatic reclosing technology, if the line is successfully reclosed after being tripped by lightning, it will have little impact on the stability of the power grid and will not cause interruption of power supply to users. Connect a pair of electrodes in parallel at both ends of the insulator string to form a discharge gap, which is used in conjunction with automatic reclosing. When a lightning strike occurs, a high lightning overvoltage is generated at both ends of the insulator string, bec...

Claims

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Application Information

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IPC IPC(8): G01R31/12
CPCG01R31/1218G01R31/1245G01R31/1272
Inventor 赵深谷山强王剑孔晓峰姜文东赵淳苏杰赵俊杰许衡徐飞明蒋卫东潜力群陈晨秦威南
Owner STATE GRID ZHEJIANG ELECTRIC POWER CO LTD JINHUA POWER SUPPLY CO
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