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Insulator surface flashover voltage estimation method and estimation apparatus
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A surface flashover and estimation device technology, applied in the field of high-voltage equipment, can solve problems such as damage and insulator damage
Inactive Publication Date: 2017-01-04
NORTH CHINA ELECTRIC POWER UNIV (BAODING) +1
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Problems solved by technology
However, the current methods of measuring the flashover voltage of insulators along the surface will cause damage to the insulator, which is a destructive test.
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Embodiment 1
[0035] see figure 1 , the method for estimating the insulator creepage flashover voltage provided by the embodiment of the present invention includes:
[0036] Step S1: Measure the surface flashover voltage of the insulator when no test voltage is applied, and obtain the preset surface flashover voltage U f1 ;
[0037] Step S2: Apply different test voltage U to the insulator i , and control the applied voltage time each time as t i ;where, 0i ≤ U f1 ;
[0038] Step S3: Apply test voltage U to the insulator each time i When stopped, measure the surface charge of the insulator, and get the test surface charge σ i ; and measure the surface flashover voltage of the insulator to obtain the test surface flashover voltage U f2i ;
[0039] Step S4: Use the fitting method to fit different test voltages U i The test surface charge σ under i And test flashover voltage U along the surface f2i, get the relationship curve;
[0040] Step S5: According to the surface charge σ of t...
Embodiment 2
[0068] see image 3, the insulator creepage voltage estimation device provided by the embodiment of the present invention includes: creepage voltage measurement unit 100, pressurization unit 400, timer 200, charge measurement unit 300 and curve fitter 500; creepage voltage measurement The output end of the unit 100 is connected to the input end of the pressurization unit 400 and the curve fitter 500 respectively, the output end of the charge measurement unit 300 is connected to the curve fitter 500, and the timer 200 is connected to the input end of the pressurization unit 400;
[0069] The creeping flashover voltage measurement unit 100 is used to measure the creeping flashover voltage of the insulator when no test voltage is applied, and obtain the preset creeping flashover voltage U f1 ;
[0070] The pressing unit 400 is used to apply different test voltages U to the insulator i ;where, 0i ≤ U f1 ;
[0071] The timer 200 is used to test the voltage U i The applied volt...
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Abstract
The invention relates to an insulator surface flashover voltageestimation method and estimation apparatus and belongs to the high-voltage equipment technical field. The objective of the invention is to estimate the surface flashover voltage of an insulator according to the surface charge of the insulator without damaging the insulator. The insulator surface flashover voltageestimation method includes the following steps that: the preset surface flashover voltage of an insulator is measured; and the test surface charge of the insulator and test surface flashover voltage of the insulator are measured in the preset surface flashover voltage range; test surface charge and test surface flashover voltage under different test voltage are fitted, so that a relation curve can be obtained; and the surface flashover voltage of an insulator to be tested is determined from the relation curve according to the surface charge of the insulator to be tested. The insulator surface flashover voltage estimation apparatus adopts the above insulator surface flashover voltage estimation method. According to the insulator surface flashover voltage estimation method provided by the invention, the surface flashover voltage of the insulator is estimated according to the surface charge of the insulator.
Description
technical field [0001] The invention relates to the technical field of high-voltage equipment, in particular to an estimation method and an estimation device for an insulator flashover voltage along the surface. Background technique [0002] An insulator is an insulation control for overhead transmission lines. During the operation of the line, the insulator is in contact with the surrounding gas or liquid dielectric for a long time, so that the gas or liquid dielectric around the insulator is broken down and discharges along the surface of the insulator. This phenomenon Known as the flashover phenomenon, the voltage at which the gas or liquid around the insulator discharges along the surface of the insulator is called the surface flashover voltage. [0003] When a flashover occurs, the sparks or arcs in the flashover channel cause local overheating on the surface of the insulator to cause carbonization, damage the insulating layer on the surface of the insulator, and cause ...
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Application Information
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