Controllable power frequency superposition impulse testing device and testing method thereof

Abstract

The invention discloses a controllable power frequency superposition impulse testing device and a testing method of the testing device. The testing device is characterized by being composed of an impulse voltage generator (1), a power frequency voltage generating device (2), a coupling capacitor (3), a tested object (4) and an automatic ignition device (5). The output end of the impulse voltage generator (1) is connected with the input end of the coupling capacitor (3). The output end of the coupling capacitor (3) is connected with the output end of the power frequency voltage generating device (2) and the high-voltage end of the tested object (4). The input end of the automatic ignition device (5) is connected with the one-time side of a power frequency side voltage adjusting device (17). The output end of the automatic ignition device (5) is connected with the grounding end of an ignition sphere gap (10) of the impulse voltage generator (1). According to the method, actual overvoltage occurring in an electrical power system can be simulated, it can be ensured that waveforms of impulse voltage acting on the high-voltage end of the tested object do not distort, the phase position impacted and superposed to power frequency can be controlled and adjusted, and the power frequency voltage can be prevented from jumping to the impulse voltage generator.

Description

technical field [0001] The invention relates to a controllable power frequency superimposed impact test device and a test method thereof, belonging to the technical field of high voltage insulation. Background technique [0002] Due to the implementation of urban distribution network automation, switching operations are becoming more and more frequent, and the power system and various equipment in the system are frequently impacted by operating overvoltage. At the same time, there are mixed lines of overhead lines and underground cables in some urban networks, which will also suffer Lightning overvoltage will bring serious harm to underground cables and electrical equipment. [0003] Chinese patent 201210195050.0 "Method for Power Frequency and Impulse Superposition Voltage Test in High Altitude Areas" uses high-voltage isolation ball gap to apply impulse voltage to the tested product to realize the superposition of power frequency and impact; Chinese Patent 201110108141.1 "...

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Problems solved by technology

[0003] Chinese patent 201210195050.0 "Method for Power Frequency and Impulse Superposition Voltage Test in High Altitude Areas" uses high-voltage isolation ball gap to apply impulse voltage to the tested product to realize the superposition of power frequency and impact; Chinese Patent 201110108141.1 "High Altitude Transmission Level AC , DC, and impact combined superimposed voltage test method" uses the protective ball gap to apply the impact voltage to the tested product, and realizes the superposition of impact and AC, impact and DC, impact and DC and AC; Chinese patent 201220626064.9 "Preventing power frequency voltage from entering Impulse voltage generator system "uses two isolated ball gaps plus a fan to prevent power frequency voltage from entering the impulse voltage generator; but the above-mentioned technology has the following disadvantages: (1) When the impulse voltage does not break down the ball gap, the impulse voltage cannot Through the ball gap, the waveform is distorted; (2) Two isolation ball gaps and a fan are used to prevent the power frequency voltage from entering the impulse voltage generator, and the synchronous breakdown of the two ball gaps is difficult; (3) The impact is not realized Controllable and adjustable phase superimposed on power frequency

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