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| Measures for Lightning Protection for OCS of High － speed Railway and Proposals |
| SHAO Li，WANG Guo － liang，BAI Yi － feng |
| The Third Survey and Design Institute Group Corporation，Tianjin 300251，China |
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Abstract Research purposes:At present，the high － speed railways in China cross the different geographical zones，but there is no backup system for them． Therefore，once the permanent damage caused by lightning strike happens，the power supply will fail to work． According to the regulations，the independent lightning conductor is set up only for the overhead contact line system ( OCS) in strong lighting area． But the OCS of high － speed railway in China is often built in heavy lighting area without lightning conductor，so it is easily stroke by lightning． To guarantee the high reliability of OCS of the high － speed railway in China，it is proposed the measures for lightning protection should be taken for OCS of the high － speed railway． Based on the theoretical calculation and analysis，the study is done on the measures for lightning protection for OCS of the high － speed railway．
Research conclusions: Considering that the lightning strike to the high － speed railway happens frequently and based on the calculation and analysis of the flashover of the OCS caused by lightning，it is proposed that PW ( protection wire) should be arranged on the top of the pole and the positive feeder should be installed with compound insulator in Auto －Transformer ( AT) power supply，and at the same time，the arrester and PW should be grounded to ensure the normal work of the lightning protection devices． It is also proposed that the indexes，such as the lightning withstand level of catenary and the switch － off rate or the failure rate，should be improved．
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Received: 09 May 2012
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2012, Vol. 29 
