Long air gap discharge multi-physical-quantity synchronous observation system and method

Abstract

The invention discloses a long air gap discharge multi-physical-quantity synchronous observation system and method, wherein the system comprises a current measurement device, an electric field measurement device and a schlieren observation device; a current measurement resistor of the current measurement device is connected in series between a Marx impulse voltage generator and a discharge ball, and a VHF antenna is arranged beside the Marx impulse voltage generator; the VHF antenna receives a VHF signal generated by sphere gap breakdown boosting of the Marx impulse voltage generator, and a trigger of an oscilloscope outputs a synchronizing signal to synchronize observation records of the current measurement device, the electric field measurement device and the schlieren observation device. According to the invention, the VHF antenna is arranged to collect the VHF signal generated by the sphere gap breakdown of the Marx impulse voltage generator before the discharge long air gap is subjected to breakdown discharge, and the signal is used as a synchronous starting reference signal, so that the accuracy of collecting the signal in the long air gap discharge stream-pilot conversion physical process is improved.

Description

technical field [0001] The invention belongs to the technical field of high-voltage testing, and relates to a long air gap discharge multi-physical quantity synchronous observation system and method, and more specifically relates to a long air gap discharge current injection-pilot transformation multi-physical quantity synchronous observation system and method. Background technique [0002] In the field of power system external insulation technology, the research on long air gap discharge mechanism is the basis of power system high voltage engineering external insulation design and lightning shielding performance analysis, and the streamer-leader transformation is the cause of air gap discharge characteristics and gap scale relationship. The main reason for non-linearity, the applicant believes that, as far as the current reality is concerned, due to the insufficient understanding of the discharge mechanism of long air gaps, especially the streamer-leader conversion process, ...

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Problems solved by technology

As far as the applicant knows, the existing observations of the streamer-leader conversion process in long air gap discharges mostly focus on the improvement of the performance of a single physical quantity observation method, although based on modern electrical measurement technology, optical observation technology and photoelectric transmission technology, they focus on a Observation methods of physical quantities have made considerable progress; for this reason, Publication No. CN 102608503 A discloses "a high-precision synchronous observation method and system for long air gap discharge", although the system uses a variety of different equipment to achieve different physical quantities However, for the synchronous start signal, the high-speed trigger receives the impulse voltage wave generated by the impulse voltage generator, and outputs a trigger signal that can be recognized by other equipment; while the impulse voltage waveform signal is output by the discharge voltage measuring device, so It can be confirmed that the generation of the impulse voltage waveform signal indicates that the long air gap has been broken down. Therefore, the start signal at this time has been delayed, and the data collected thereafter obviously failed to include the whole process of breakdown. Obviously, this kind of start-up There is a problem of synchronous start signal error in the method, which will cause errors in the analysis results

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