Apparatus for generating oscillating wave for electrical apparatus test

Abstract

An oscillatory wave generator for electric equipment tests is composed of a power supply AC, a switch K1, a capacitor C and an inductor L. Before closing the switch K1, the power supply AC, the capacitor C and the inductor L form a serial loop, after closing the switch K1, the capacitor C and the inductor L form a LC attenuation oscillating circuit, wherein the internal resistance of the power supply is R, the internal resistance of the inductor is R0. The invention is characterized in that a frequency and voltage modulated power source is adopted as the power supply AC, the switch K1 is an electronic switch. The invention has the advantages that the oscillatory wave generator adopts an alternative current power supply of lower voltage as excitation to realize the resonance of the LC series loop to attain resonance high voltage, and according to electrotechnology theory, the resonance high voltage is Q powers of the alternative current excitation voltage, wherein Q is the quantity factor of the LC series resonance loop, and since the alternative current excitation power supply has low voltage, the electric switch can attain lower working voltage.

Description

technical field [0001] The invention relates to an oscillating wave generating device based on AC excitation, in particular to an oscillating wave generating device used for electrical equipment testing. Background technique [0002] The measurement of sine wave withstand voltage and partial discharge of electrical equipment is the basic detection method to measure the insulation performance of electrical equipment. Generally, the test transformer is used to directly pressurize, but when the equivalent capacitance of the tested product is large and its test voltage is very high , the capacity of the test transformer will be very large, making it impossible to complete the test on site. In recent years, oscillating waves have been used at home and abroad to conduct sine wave withstand voltage and partial discharge tests on electrical equipment, which can reduce the capacity of test equipment. [0003] At present, the oscillating wave used for detection is generated by means ...

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Problems solved by technology

For example, the OWTS HV150 type DC excitation oscillating wave generator of SEBAKMT company in Germany is used for partial discharge detection. Its test voltage can only reach 150kV, and the sales price in the Chinese market is as high as 6 million yuan, which is very expensive.

[0006] There is no oscillatory wave generator higher than 200kV or even 1000kV at home and abroad so far. With the increase of the grid voltage level, how to increase the voltage of the oscillatory wave generator used for electrical equipment testing is an urgent issue for the power testing department.

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