基于Stark展宽法对真型断路器中电弧电子密度诊断的研究OA

In high-voltage electrical equipment,the arc generated internally is directly related to the success or fail-ure of the interruption of switchgear,making the diagnosis of the arc plasma essential.Emission spectroscopy,by mea-suring the emission intensity of characteristic atomic spectral lines,can effectively diagnose the electron density of plasma.This technique offers such advantages as non-invasive measurement,transient detection,low detection lim-its,good selectivity,and simple instrumentation.In this study,the subject of investigation is an AC air arc at a peak current of 768 A under a pressure of 2 bar.The arc light signal is spectrally dispersed through optical components such as lenses and gratings,and the emission spectrum of the arc is captured using an ICCD.Since only the two-di-mensional projection of the arc light through an observation window can be obtained,it is necessary to employ the Abel inversion to reconstruct the actual spectral distribution,and obtain the radial distribution of emission intensity distribution along the arc column.In the study,the N II 571.8 nm spectral line is reasonably selected as the character-istic line.The measured Voigt profile is deconvoluted,and the Stark broadening method is applied to obtain the data result on the spatial variation of the arc electron density within the range of 0.02 to 1.724×1023 m-3.For the first time,this study diagnoses the arc electron density in a full-scale circuit breaker with nozzle and gas-blowing conditions us-ing the Stark broadening method.These results are of great significance for an in-depth understanding of the internal microscopic mechanisms and characteristics of the arc,and provide data references for the simulation and parameter calculation of high-voltage electrical equipment.