Power-frequency AC withstand voltage detection method

Abstract

The invention relates to a power-frequency AC withstand voltage detection method, and belongs to the technical field of power-frequency withstand voltage detection. Preliminary estimation is made according to the test voltage and capacity of a tested sample, and a proper test voltage regulating device and related equipment are selected; power supply of the tested sample is cut off, and all relatedconnecting lines are dismounted or disconnected; environment condition including the atmospheric pressure and temperature during test is recorded; and a horizontal adjusting screw in the bottom of anelectrostatic voltmeter is adjusted till a sprit level indicates that the electrostatic voltmeter is in a horizontal position, and proper measuring ranges are selected for related instruments. The technical ideal is clear, the method is convenient to realize, the voltage can be regulated smoothly, an output voltage higher than an input voltage can be obtained, the method also has advantages of low leakage reactance, low loss and low waveform distortion, a tested device is avoided from undue insulating breakdown during AC withstand voltage, maintenance time is shortened, and the service life of equipment is prolonged.

Description

technical field [0001] The invention relates to a power frequency AC withstand voltage detection method, and belongs to the technical field of power frequency withstand voltage detection. Background technique [0002] The insulation deterioration of electrical equipment can generally be divided into two categories. One is the general deterioration of electrical equipment, and the insulation gradually becomes obsolete and aging under the action of high temperature, electric field and vibration during long-term operation. The other type is local defects. Local defects often occur in electrical equipment due to various reasons during operation. Such local defect insulation weakness develops faster than general deterioration and is therefore very dangerous. Power frequency AC withstand voltage test is the most effective and direct method to identify the insulation condition of electrical equipment. It can judge whether electrical equipment can continue to operate, and it is al...

AI Technical Summary

Problems solved by technology

But for poor insulation, it is a destructive test to some extent, so the AC withstand voltage test should be carried out after the test items such as insulation resistance, absorption ratio, leakage current measurement, and dielectric loss measurement of the tested product are all qualified. The standard of AC withstand voltage test voltage and test time is a relatively complicated issue. Due to different types of electrical equipment, different structures and different application occasions, the requirements for insulating materials are also different.