Ultra-high frequency adjusting harmonic vibration testing power based on high power IGBT

Abstract

The utility model discloses an ultra high voltage frequency modulation harmonic resonance testing power supply based on a high power IGBT, which comprising a rectification circuit, a controller, a high power IGBT inverter, an LC filter circuit, an ultra high voltage generating circuit and a detection circuit. The input terminal of the rectification circuit is connected with a three-phase AC input, the output terminal of the rectifier circuit supplies current toward the high power IGBT, the controller generates a PWM control signal for the high power IGBT inverter, the output signal of the high power IGBT inverter changes to a smooth sine signal through the LC filter, and then be sent to the input terminal of the ultra high voltage generating circuit, which generates high voltage, the detection circuit detects the output of the ultra high voltage generating circuit, transferring the detection signal to the controller via the optical fiber in high speed. The utility model has advantages of simple structure, light weight, low cost, high reliability and capability of graded outputting ultra high voltage.

Description

technical field [0001] The invention relates to a power system ultra-high voltage test source, in particular to a high-power IGBT-based ultra-high voltage frequency modulation resonance test power source. Background technique [0002] With the development of the power grid in the direction of high voltage, high-voltage power transmission and transformation equipment with SF6 as the medium, such as circuit breakers, GBS, GIS, and SF6 transformers, are widely used. During the handover and acceptance of the project, the AC withstand voltage test should be carried out on these high-voltage electrical equipment. Secondly, the new IEC standard requires that for transformers with a voltage level above 110KV, a partial discharge test should be done when the new installation is put into operation. Cross-linked cables are widely used in urban network projects. Considering the cumulative effect and the sensitivity of fault detection, AC withstand voltage tests are required. These tes...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the technical problems of high energy consumption, poor reliability and high cost of existing high-voltage test power supplies, the present invention provides a UHV frequency-modulated resonant test power supply based on high-power IGBTs with light weight, low cost and high reliability.

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