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    Suzhou Electric Appliance Research Institute
    期刊號: CN32-1800/TM| ISSN1007-3175

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    串聯諧振型交流激勵式電纜振蕩波局放檢測系統研究

    來源:電工電氣發布時間:2022-06-21 09:21 瀏覽次數:387

    串聯諧振型交流激勵式電纜振蕩波局放檢測系統研究

    伍弘,郝金鵬,王博,楊凱,房子祎,牛勃
    (國網寧夏電力有限公司電力科學研究院,寧夏 銀川 750011)
     
        摘 要:針對現有直流、交流激勵式電纜振蕩波局部放電(局放)檢測系統在成本投入、檢測準確性方面存在的問題,研究了一種基于串聯諧振試驗系統的交流激勵式新型電纜振蕩波局放檢測系統。對現有串聯諧振試驗設備進行改造,在勵磁變高壓端并聯大功率高壓固態電子開關并與變頻電源一體化封裝;通過變頻電源主機控制電子開關閉合,使被試電纜、諧振電抗器、回路電阻形成阻尼振蕩,激發電纜潛在缺陷產生局放;通過專用分壓器實現電纜本體電壓監測并采集局放信號至專用分析終端。實測結果表明,新型振蕩波局放檢測系統采用交流電壓激勵,不會造成電纜絕緣電荷積聚,能在完成交流耐壓試驗的同時進行振蕩波局放檢測,并有效發現電纜潛在缺陷。
        關鍵詞: 電纜;串聯諧振系統;交流激勵;振蕩波;局部放電
        中圖分類號:TM855     文獻標識碼:B     文章編號:1007-3175(2022)06-0048-05
     
    Research on the Partial Discharge Detection System of AC Excitation
    Oscillating Wave of the Cable Based on the Series Resonance System
     
    WU Hong, HAO Jin-peng, WANG Bo, YANG Kai, FANG Zi-yi, NIU Bo
    (Power Research Institute of State Grid Ningxia Electric Power Co., Ltd, Yinchuan 750011, China)
     
        Abstract: The DC/AC excitation of the oscillating wave of the cable of the partial discharge detection system has problems with cost input and examination accuracy. This paper studied an AC excitation of the oscillating wave of the cable of the partial discharge detection system based on the series resonance system.It reformed the series resonant testing equipment. The end of the HV excitation paralleled the solid-state switch with high voltage and high power and integrated and packaged with the frequency converter.The tested cable, resonance reactor, and circuit resistance formed damped oscillation when the main engine controlled switch of the frequency converter closed, stimulating the potential defects of the cable and producing partial discharge.This paper realized the voltage monitoring of the cable by using a special voltage divider. In addition, it collected the partial discharge signals and sent the signals to the special analysis terminal.The results show that the new oscillation wave partial discharge detection system would not cause the accumulation of insulative electric charge of the cable by using AC voltage excitation. It could complete AC withstand voltage test while conducting the oscillating wave partial discharge detection, and discover the potential defects of the cable.
        Key words: cable; series resonance system; AC excitation; oscillation wave; partial discharge
     
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