High-frequency insulation withstand voltage tester

Abstract

The invention provides a high-frequency insulation withstand voltage tester. The high-frequency insulation withstand voltage tester comprises a single-phase AC voltage regulator (1), a single-phase full-bridge uncontrolled rectifying circuit (2), a filter capacitor (3), a single-phase full-bridge inverter (4), a control system (5), an adjustable inductor (6), an adjustable capacitor (7) and a high-frequency high-voltage transformer (8). A test sample is connected to the output end of the high-frequency high-voltage transformer (8); a series resonance circuit composed of the adjustable inductor (6) and the adjustable capacitor (7) is enabled to work in the resonant states of different frequencies by changing the frequency of a square wave excitation signal output by the inverter, and then a high-frequency sinusoidal waveform can be generated at the input end of the high-frequency high-voltage transformer, and therefore, a frequency-adjustable high-frequency sinusoidal signal can be obtained at the output end of the transformer; the regulation of the amplitude of the output voltage of the tester can be realized by adjusting the output voltage of the single-phase AC voltage regulator. Finally, simultaneously adjustable output frequency and voltage of the tester are realized. The high-frequency insulation withstand voltage tester can be applied to the withstand voltage tests of insulating materials or equipment different in frequency and voltage grade.

Description

technical field [0001] The invention relates to a testing instrument, in particular to a high-frequency withstand voltage testing instrument in the field of high-voltage insulation testing. Background technique [0002] The insulation withstand voltage tester is a basic measurement and test equipment in the field of high voltage and insulation technology, which plays a key role in assessing and testing the insulation performance of materials or devices. With the development of power electronic equipment, the operating frequency of electrical equipment has changed from the original power frequency AC form to various, and the continuous increase in operating frequency is a major development trend, which also makes the withstand voltage test of materials or devices under high frequency become a problem. At present, the power frequency insulation withstand voltage tester is generally used for inspection, but the difference in insulation performance of different materials under ...

AI Technical Summary

Problems solved by technology

[0003] Patent 201110350149.9 discloses an AC withstand voltage tester, which controls the primary side voltage of the step-up transformer through an insulated gate bipolar transistor, thereby precisely controlling the output voltage of the AC withstand voltage tester; patents 201120438394.0 and 200620083337.4 disclose AC withstand voltage testers, Improved the performance of the power frequency AC insulation withstand voltage tester, but did not control the output frequency

Images