广州地铁供电系统33 kV环网接线方式的思考

介绍了广州地铁供电系统33 kV环网接线方式的现状并对地铁1、2号线不同接线方式的优缺点和设计思路进行了比较。33 kV环网接线方式应在保证供电可靠性的前提下,尽量简化接线方式,尽可能地减少地铁隧道内的电缆数量,以降低工程投资,便于工程实施和今后的运营维护。

The 33kV Power Supply Network Connection Mode for Guangzhou Metro

With a brief review of the deve-lopingprocess of the 33 kVpower supply network connection mode ofGuangzhou Metro,this paper makes a summary for the experi-ences on the engineering practices.The 33 kV power supplynetwork system of Guangzhou Metro Line 1 adopts the powersupply mode of large subarea,which means the quantity of pow-er supply subarea is just two ti mes that of the main transformersubstation.Guangzhou Metro Line 2 and the other metro linesadopt the power supply mode of small subarea,which means thequantity of power supply subareais more thantwoti mes that ofthe main transformer substation.The author makes a compari-son between these two network connection modes,argues thatthe quantity of feed-out breaker of the maintransformer substa-tion in 33 kV power supply network system of GuangzhouMetro Line 1 is the least,because the cables of 33 kV powersupply networksystem would be saved,but 33 kVoverload cur-rent protectors would be collocated with difficulty.While thequantity of feed-out breaker of the main transformer substationin 33 kV power supply network system of Guangzhou MetroLine 2 is more,because the cables of 33 kV power supply net-work system would be increased,and 33 kV overload currentprotector would be easily collocated.And further more,in theprocess of engineering i mplement,the cable-laying work willbecome more and more difficult.The author briefly analyzes thecharacteristics of economy and reliability of the two connectionmodes of 33 kV power supply network systemin GuangzhouMetro,comes to the conclusion that the 33 kV power supplynetwork connection mode should be si mplified as far as possibleonthe premise of the power supply credibility,so as to lowerthe engineeringinvestment cost andto carry out the engineeringsmoothly.This will guide the design of Guangzhousubway pow-er supply systemin the future.