A Method for Observing the Temporal and Spatial Distribution of Air Gap Discharge Emission Spectrum

Abstract

The invention discloses a method for observing the space-time distribution of air-gap discharge emission spectrum. By setting the trigger time delay of the grating spectrometer and the gain of the image enhancement detector, and correcting the transmission time delay of various signals, accurate and resolving power can be obtained. Spatio-temporal distribution of emission spectra of air-gap discharges under high-rate standard lightning strikes. The method for observing the space-time distribution of the emission spectrum of the air gap discharge under the standard lightning impact provided by the invention is used for the research on the lightning protection design of the power system.

Description

technical field [0001] The invention relates to the technical field of power systems, in particular to an observation method for the time-space distribution of an air-gap discharge emission spectrum. Background technique [0002] Lightning is one of the main reasons for the tripping of transmission lines. Therefore, the research on the physical mechanism, protective measures and numerical simulation methods of air gap discharge under lightning impact is the focus and difficulty of lightning protection in power systems. [0003] In the prior art, in the observation of the emission spectrum of the air gap discharge, the emission spectrum of the discharge channel after the air gap is broken down is mainly obtained through a fiber optic probe and a fiber optic spectrometer. However, it is limited by the exposure time, shooting speed, and fiber optic probe placement requirements of the fiber optic spectrometer: first, the emission spectrum of the air gap discharge is obtained thr...

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Problems solved by technology

However, it is limited by the exposure time, shooting speed, and fiber optic probe placement requirements of the fiber optic spectrometer: first, the emission spectrum of the air gap discharge is obtained through at least μs level exposure, and the pulse period of the standard lightning impulse voltage is not instantaneous, so it cannot Obtain the emission spectra of each development stage of the air-gap discharge; second, due to the randomness of the discharge channel path under the standard lightning strike with a long air gap, it is difficult to effectively place the fiber optic probe near the air gap; third, the fiber optic spectrometer cannot analyze the emission spectrum The intensity of the linear gain, if used to obtain the emission spectrum of the corona initiation and streamer development stage, its intensity and resolution may not be ideal

Therefore, the temporal-spatial distribution of the air-gap discharge emission spectrum under the standard lightning impulse obtained under the existing observation technology and method is seriously insufficient in accuracy and resolution, which limits the in-depth study of the physical mechanism of the air-gap discharge under the standard lightning impulse. As a result, it is impossible to set reasonable protective measures in the power system, which hinders the improvement of the lightning protection level of the power system

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