Device and method for oscillatory wave generation in electrical device partial discharge test

Abstract

The invention provides a device for oscillatory wave generation in an electrical device partial discharge test. The device comprises a first switch set, a second switch set, a fifth switch, a power supply, a damping resistor with the adjustable resistance value and an LC oscillating circuit. The first switch set comprises a first switch and a fourth switch. The second switch set comprises a second switch and a third switch. A series circuit composed of the first switch and the second switch, a series circuit composed of the third switch and the fourth switch and the power supply are in parallel connection. A circuit between the first switch and the second switch is connected with one end of the fifth switch. A circuit between the third switch and the fourth switch is connected with the other end of the fifth switch. The LC oscillating circuit and the damping resistor are in series connection and then in parallel connection with the fifth switch. The invention further provided with a method for oscillatory wave generation in the electrical device partial discharge test. High-voltage test oscillatory waves can be generated through the direct-current low-voltage excitation power supply and the electronic switches.

Description

technical field [0001] The invention relates to a device and method for generating an oscillating wave based on direct current excitation, in particular to an oscillating wave generating device and method for partial discharge tests of electrical equipment. Background technique [0002] The basic detection method of the insulation performance of electrical equipment is to measure the sine wave withstand voltage and partial discharge of the electrical equipment. Generally, the method of directly loading the test voltage with the test transformer is used for the test. However, when the equivalent capacitance of the tested product is very large and its test voltage is very high, the capacity of the test transformer to load the test voltage will be very large, resulting in the inability to complete the test on site, making this simple and easy method invalid. A feasible technical solution is to use oscillating waves to conduct sine wave withstand voltage and partial discharge te...

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Problems solved by technology

Patent 200810124755.7 introduces the test voltage of the OWTSHV150 partial discharge detection DC excitation oscillatory wave generator of German SEBAKMT company, which can only reach 150kV, and the sales price in the Chinese market is as high as 6 million yuan, which is very expensive

[0006] So far, there are no oscillatory wave generators higher than 250kV or even 1000kV at home and abroad. With the rapid advancement of urbanization, the requirements for the voltage level of the power grid are getting higher and higher. How to improve the partial discharge test of electrical equipment? The voltage level of the oscillating wave generating device used has become an urgent problem to be solved by the power detection department

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