High-power non-partial discharge variable-frequency power source used for high-voltage tests and parallel-operation resonant testing device thereof

Abstract

The invention discloses a high-power non-partial discharge variable-frequency power source used for high-voltage tests and a parallel-operation resonant testing device thereof. The high-power non-partial discharge variable-frequency power source comprises a signal generator, a digital potentiometer, a preceding-stage power amplifier circuit, a bridge-type power amplifier circuit, a rectifier filter circuit, a pre-closing circuit and a fast overcurrent protecting circuit, wherein the signal generator is used for generating a standard sine-wave signal to carry out frequency and voltage regulation through the digital potentiometer and outputting the signal to directly push the preceding-stage power amplifier circuit, the preceding-stage power amplifier circuit is divided into two paths of output, one path of output is used for generating a synchronous power source with same test frequency so as to be fed to a local discharge instrument, and the other path of output is used for pushing thebridge-type power amplifier circuit; the pre-closing circuit is electrically connected to the rectifier filter circuit and the bridge-type power amplifier circuit; the bridge-type power amplifier circuit consists of four high power transistors to form four bridge arms, and each bridge arm mainly consists of more than one thousand transistors in parallel. A step-by-step amplification principle isadopted, original micro power signals are amplified repeatedly to realize high-power output, and the testing requirement is met.

Description

【Technical field】 [0001] The invention relates to a device and method in the technical field of electric power system power supply, in particular to a non-partial discharge variable frequency power supply and a resonance test device thereof which can be used for on-site withstand voltage tests of AC500kV high-voltage equipment. 【Background technique】 [0002] With the continuous development of my country's power system, users have put forward higher requirements for power transmission and distribution equipment and transmission reliability, and the voltage level of power equipment that needs to be tested on-site is getting higher and higher. The capacity and power of the variable frequency power supply used also put forward higher requirements. [0003] At present, the capacity of a single variable frequency power supply in the domestic market can no longer meet the test of such power transmission and distribution equipment and transmission cables. The variable frequency pow...

AI Technical Summary

Problems solved by technology

However, this technology does not involve the variety of communication signals between the master and slave inverters, which may easily cause mis-decoding of the master-slave controller, and even cause false triggering of the IGBT, resulting in accidents.

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