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Method for calculating protective gap distance based on Weibull distribution

A protection gap and calculation method technology, applied in the direction of overload protection device, dielectric strength test, etc., can solve the problems of low accuracy, complex calculation, and many pre-order work, so as to achieve convenient operation, ensure reliable operation, and ensure safety Effect

Inactive Publication Date: 2015-05-20
STATE GRID CORP OF CHINA +3
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Problems solved by technology

[0006] When the normal distribution is used for calculation, many experimental groups need to be collected, otherwise the accuracy is low. Generally, hundreds of experiments are required to meet the accuracy requirements. The pre-order work is much and the calculation is complicated.

Method used

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  • Method for calculating protective gap distance based on Weibull distribution
  • Method for calculating protective gap distance based on Weibull distribution
  • Method for calculating protective gap distance based on Weibull distribution

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Embodiment Construction

[0027] The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0028] This technical solution comprises the following steps:

[0029] 1) Connect the impulse voltage generator 1 for generating the impulse voltage, the voltage divider 2 for voltage division, and the oscilloscope connected to the low-voltage side of the voltage divider 2 on the insulator 3; figure 1 shown;

[0030] 2) Test the 3 strings of insulators, apply the test voltage from low to high, measure the flashover voltage, record the lightning impulse flashover voltage, repeat the experiment 20 to 30 times, and obtain a set of test data;

[0031] 3) An adjustable protective device is connected in parallel at both ends of the 3 strings of insulators, such as figure 2 As shown, the adjustable protection device includes a first conductive ball 6 and a second conductive ball 7, the first conductive ball 6 and the second conductive ba...

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Abstract

The invention provides a method for calculating a protective gap distance based on Weibull distribution, and relates to a method for calculating the protective gap distance. When the normal distribution is used for calculating, multiple previous procedures are performed, and the calculating is complicated. The method comprises the following steps of testing an insulator string, and recording the lightning impulse flashover voltage; enabling a parallel adjustable protecting device to measure the breakdown voltage, and recording the lightning breakdown voltage; using a Weibull probability method to treat the lightning impulse flashover voltage of the insulator string; selecting a plurality of gap distances; selecting the protective gap distance according to the insulation matching principle that Ui0.1% is greater than Ug99.9%. By adopting the technical scheme, the method has the advantages that the distance between the parallel gaps is determined on the basis of the Weibull method, the optimum lightning impulse insulation matching is guaranteed, the operation is convenient, and the rapidity and reliability are realized.

Description

technical field [0001] The invention relates to a calculation method for the protection gap distance, in particular to a calculation method for the series-parallel protection gap of insulators. Background technique [0002] Before use, the insulator series-parallel protection gap must be tested by lightning impulse discharge test, thermal stability test and power frequency arc test to ensure that it can protect the insulator and prevent lightning strikes from disconnecting. But in actual use, the most important thing is to measure the lightning impulse discharge voltage of the insulator string and the protective gap, and make it achieve the best insulation coordination, so as to determine the gap distance of the parallel protective gap. [0003] Due to the dispersion of the discharge voltage, 50% impulse discharge voltage is usually used in engineering to measure the lightning flashover characteristics of the gap. The national standard GB / T16927.1 stipulates that the 50% li...

Claims

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Application Information

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IPC IPC(8): G01R31/12G01R1/36
Inventor 刘能任新新高伟庆杨鑫
Owner STATE GRID CORP OF CHINA
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