HIGH VOLTAGE APPARATUS

 

 

Chief Editor: ZHang Jinbo

Sponsored by: China XD Group Corporation

Publication Frequency: Monthly

ISSN: 1001-1609

CN: 61-1127/TM

Address: No. 18, North Section of West Second Ring Road, Xi'an City

Postal distribution code: 52-36

Founded: 1958

 

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Volume 62 期 10，2026 2026年第62卷第10期

  • Overview

    MEI Hongwei, SHEN Peng, JIANG Hongjiao, LIU Hui, ZHOU Chao, SHEN Hao, WANG Liming

    DOI：10.13296/j.1001-1609.hva.2026.10.001
    摘要：With the continuous construction of ultra-high voltage networks in China,composite insulators are gradually applied in high-altitude regions with intense ultraviolet radiation. Under solar ultraviolet riiadiation,the silicone rubebr of the composite insulators undergoes UV aging,affecting its mechanical,electrical and material properties,leading to breakdown of chemical bonds in the composite insulator,the formation of voids and particles on the maaterial surface,increase of hardness and,consequently,affecting the breakdown strength,surface resistivity and volume resistivity of the insualtor as well as reducing its long-term service life and the safety of power grid operation. In this paper,the mechanisms by which ultraviolet radiation affects silicone rubber,as reported by domestic and international scholars,are summarized. The influence of ultraviolet rays on the macroscopic and microscopic properties of silicone rubber is analzed. The application of anti-ultraviolet aging methods in silicone rubber materials is discussed,the differences between different artificially accelerated ultraviolet aging methods are compared and the suggestions for improving the anti-ultraviolet aging performance of silicone rubber is given so to provide reference for researchers in the field of composite insulator aging.  
    关键词：composite insulator;silicone rubber;ultraviolet aging;test method;operating status   
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  • Research & Analysis

    WU Tiezhou, ZHAO Rui, LI Houjia

    DOI：10.13296/j.1001-1609.hva.2026.10.002
    摘要：Solid state circuit breaker(SSCB),compared with mechanical circuit breakers,has received much attention in short-circuit protection of DC network due to its such advantages as arc-free current interruption upon short circuit occurrence and high reliability. In this paper,a DC SSCB with automatic fault isolation capability is designed. The SSCB consists of a short-circuit judgement module and a fault current buffer module which,in case of short circuit,can clear the fault current without an external control system. The different operating states of this solid-state circuit breaker is analyzed,the corresponding mathematical model is set up and used as the theoretical basis for parameter design. After completion of the design,it is compared with the existing solid state circuit breaker in short circuit interuption simulation at 10 kV/500 A DCnetwork. The simulation result shows that after addition of the SSCB with automatic fault isolation capability,the operation loss of the transmission line is only increased by 0.025%,therefore the circuit breaker does not affect the normal operation of the circuit. After the occurrence of short circuit fault of the DC network,the circuit breaker can automatically interrupt within 5 ms and smoothly absorb the fault current so that the peak voltage sustained by the SSCB does not exceed 1.5 times the line voltage,thereby providing reliable protection for the DC network.  
    关键词：DC faults;solid-state circuit breakers;short-circuit determination;fault current buffering;peak voltage   
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    更新时间：2026-10-14

    XIAO Jianqiao, SUN Hao, LI Gang, ZUO Yunwei, LU Yang, LIU Ping, YU Wenbo

    DOI：10.13296/j.1001-1609.hva.2026.10.003
    摘要：In high-voltage electrical equipment,the arc generated internally is directly related to the success or failure of the interruption of switchgear,making the diagnosis of the arc plasma essential. Emission spectroscopy,by measuring 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 limits,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-dimensional 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 characteristic 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 using 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.  
    关键词：gas arc;emission spectroscopy;Stark broadening;Abel inversion   
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    XIAO Hanyan, ZHAO Ke, LI Hongtao, ZHUANG Tianxin, YIN Ze, GAO Shan

    DOI：10.13296/j.1001-1609.hva.2026.10.004
    摘要：Various insulation defects in gas insulated switchgear(GIS)are the primary cause of insulation performance deterioration and safety accidents. The conventional ultrasonic testing method,due to the limit of the response frequency band of the piezoelectric sensors and the resonance feature of the GIS enclosure,has no way to obtain accurately the broadband partial discharge signals,thereby affecting the detection effectiveness. In this paper,a built-in broadband photoacoustic microphone technology is employed to acquire the broadband acoustic emission signatures of such four typical defects as metal protrusions,free particles,floating potential,and internal air gaps in epoxy insulation. The results show that acoustic signals generated by metal tip defect and free particle defect are clustershaped,with a longer duration and a lower peak frequency,while that of floating potential defect and internal air gap in epoxy insulation is pulse-shaped,with a short duration and a higher peak frequency. The peak frequency and amplitude of insulation defect acoustic signals are strongly correlated with defect size. The use of equivalent time and equivalent frequency method can distinguish the four types of defect sound signals effectively. The research results can provide reference for the detection and diagnosis of GIS/GIL insulation defects.  
    关键词：GIS;metal tips;free metal particle;floating potential;air-bubble inside epoxy;acoustic emission;photoacoustic microphone   
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