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

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串聯(lián)諧振型交流激勵(lì)式電纜振蕩波局放檢測系統(tǒng)研究

來源:電工電氣發(fā)布時(shí)間:2022-06-21 09:21 瀏覽次數(shù):439

串聯(lián)諧振型交流激勵(lì)式電纜振蕩波局放檢測系統(tǒng)研究

伍弘,郝金鵬,王博,楊凱,房子祎,牛勃
(國網(wǎng)寧夏電力有限公司電力科學(xué)研究院,寧夏 銀川 750011)
 
    摘 要:針對(duì)現(xiàn)有直流、交流激勵(lì)式電纜振蕩波局部放電(局放)檢測系統(tǒng)在成本投入、檢測準(zhǔn)確性方面存在的問題,研究了一種基于串聯(lián)諧振試驗(yàn)系統(tǒng)的交流激勵(lì)式新型電纜振蕩波局放檢測系統(tǒng)。對(duì)現(xiàn)有串聯(lián)諧振試驗(yàn)設(shè)備進(jìn)行改造,在勵(lì)磁變高壓端并聯(lián)大功率高壓固態(tài)電子開關(guān)并與變頻電源一體化封裝;通過變頻電源主機(jī)控制電子開關(guān)閉合,使被試電纜、諧振電抗器、回路電阻形成阻尼振蕩,激發(fā)電纜潛在缺陷產(chǎn)生局放;通過專用分壓器實(shí)現(xiàn)電纜本體電壓監(jiān)測并采集局放信號(hào)至專用分析終端。實(shí)測結(jié)果表明,新型振蕩波局放檢測系統(tǒng)采用交流電壓激勵(lì),不會(huì)造成電纜絕緣電荷積聚,能在完成交流耐壓試驗(yàn)的同時(shí)進(jìn)行振蕩波局放檢測,并有效發(fā)現(xiàn)電纜潛在缺陷。
    關(guān)鍵詞: 電纜;串聯(lián)諧振系統(tǒng);交流激勵(lì);振蕩波;局部放電
    中圖分類號(hào):TM855     文獻(xiàn)標(biāo)識(shí)碼:B     文章編號(hào):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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