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

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特高壓變電站隔離刀閘二次回路若干問題分析及改進

來源:電工電氣發(fā)布時間:2020-10-23 16:23 瀏覽次數(shù):755
特高壓變電站隔離刀閘二次回路若干問題分析及改進
 
劉濤,裴東良,楊征,王卓,田蕊
(國網(wǎng)河南省電力公司檢修公司,河南 鄭州 450051)
 
    摘 要:針對超(特)高壓變電站和換流站隔離、接地刀閘設(shè)備暴露出的問題及缺陷,總結(jié)了刀閘二次回路若干問題并提出改進措施。為防止電機電流串入控制回路而燒損元器件,刀閘控制回路宜與電機回路電源獨立;氣體封閉絕緣組合電器(GIS)間隔整流器出口宜設(shè)置平衡電阻橋接地,以便于維護檢修工作;刀閘輔助接點不宜閉鎖斷路器合閘,以確保斷路器合閘控制回路的可靠性;針對長期帶電的電子式熱繼電器易燒損,接有長電纜的刀閘電機接觸器易發(fā)生誤動事故,提出了電源接線等改進方案;指出測控裝置出口繼電器接點性質(zhì)應(yīng)與控制回路電源性質(zhì)一致,并針對GIS間隔溫濕度控制器與加熱器分散布置的缺點給出改進意見。為刀閘設(shè)備的生產(chǎn)制造、系統(tǒng)設(shè)計和現(xiàn)場運維檢修工作提供了參考。
    關(guān)鍵詞:超(特)高壓變電站;隔離刀閘;接地刀閘;控制回路;平衡電阻橋;電子式熱繼電器
    中圖分類號:TM564;TM63     文獻標識碼:B     文章編號:1007-3175(2020)10-0032-07
 
Analysis and Improvement on Problems in Secondary Circuit of Disconnector in UHV Substations
 
LIU Tao, PEI Dong-liang, YANG Zheng, WANG Zhuo, TIAN Rui
(Maintenance Company of Henan Electric Power Corporation, Zhengzhou 450051, China)
 
    Abstract: For the problems of disconnector and earthing switches in EHV (UHV) substation and converter station, this paper summarizes some problems in the secondary circuit of switches and puts forward improvement measures. In order to prevent the motor current flow in series to the control circuit and burn the components, the switches control circuit and motor circuit should be seperately power supplied. The earthing balance resistance bridge should be installed at the outlet of GIS unit’s rectifier to facilitate maintenance and repair work. To ensure the reliability of circuit breaker closing control circuit, the auxiliary contact of switches should not block the closing operation of circuit breaker. For the long-term electrified electronic thermal relay is frequently burnt, and the switches motor contactor connected with long cable is easy to wrong operation, the power wiring and other improvement schemes are proposed. The nature of outlet relay contacts should be consistent with that of control circuit power supply. Disadvantage and suggestion of decentralized arrangement of GIS unit’s temperature & humidity controller and its heater is put forward. It provides a reference for the manufacture, system design and on-site operation and maintenance of switchgear.
    Key words: EHV(UHV) substation; disconnector; earthing switch; control circuit; balanced resistance bridge; electronic thermal relay
 
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