地铁临时支援供电中压环网方案研究

因征地拆迁等原因,地铁主变电所及电缆通道常因工期滞后而需临时支援供电。针对临时支援供电问题研究其中压环网方案,提出了系统运行方式及可靠性、压降要求、倒接可行性和经济性4方面评价标准。以武汉地铁2号线南延线为例,提出3种临时支援供电方案。分别阐述了每种方案的运行方式,计算了环网压降,研究倒接方案的可行性和经济性。通过综合比较,总结出各方案的优缺点,提出注意事项,为后续工程提供思路。

Research on Subway Temporary Support Power Supply Scheme on Medium Voltage Ring Network

Due to the difficulties of land acquisition and demolition,the time limit of subway main transformer substation and its cable passage projects are often lagged behind the overall progress.Hence the temporary support power supply is required.In view of the medium voltage ring network scheme in temporary support power supply,four aspects of evaluation criteria are put forward,including system operation mode and reliability,voltage drop calculation,feasibility and economic efficiency of the inverted reset scheme.Taking the South Extension of Wuhan metro Line 2 as an example,3 temporary support power supply schemes are put forward.The operation mode of each scheme is expounded,the voltage drop of the ring network,the feasibility and economic efficiency of the inverted reset scheme are calculated and studied.Through comprehensive comparison,the advantages and disadvantages of each scheme are summarized,corresponding suggestions are put forward to provide ideas for the follow-up projects.