研究目的:随着电气化铁路的发展，雷电一直是危害牵引变电所安全可靠运行的重要因素之一。近年来，牵引变电所雷击事故时有发生，为加强牵引变电所的防雷水平，针对某220 kV牵引变电所发生的雷击事故进行研究，该事故使牵引变电所设备烧损严重，具有一定的典型性。本研究旨在通过对雷电流幅值、雷击点过电压、建弧率、短路电流等的计算，分析事故发生的原因和过程，提出防雷加强措施，避免此类事故再次发生。
研究结论:(1)如果架空回流线架设过高，当雷击回流线时直击雷将通过电缆直接引人到变电所内，另外，供电线不设进线保护段，则可能烧毁避雷器;(2)供电线首端架设避雷线、加强接地及研究母线保护等措施，可以进一步提高牵引变电所的防雷水平;(3)该研究成果主要应用于牵引变电所的防雷方案优化和设计领域。
Research purposes:With the development of the electrified railways，lightning is one of the important factors which endangering safe and reliable operation of the traction substation. The lightning accident of the traction substation was occurred from time to time. In order to improve the traction substation’s lightning protection level，it is studied according to the lightning accident of a 220 kV traction substation. It’s a typical accident and the equipments of the traction substation are damaged seriously. This study aims to analyze the cause and the process of this accident based on the calculation of the lightning current amplitude，lightning overvoltage，arcing rate，and the short circuit current，give the strengthening measures of lightning protection to avoid the similar accident.
Research conclusions:(1)The direct lightning stroke will be led into the substation when the lightning strikes the
overhead return line if it’S lnstalled t00 high arid the arrester Wlll be destroyed if the Overhead feeder hne lsn’t installed
incoming protection line. (2)Some proposals can improve the substation’s lightning protection lever, such as installing
the incoming lightning protection line of the feeder, strengthening the grounding line，researching the bus一bar
protection relay，and so on.(3)The research results are mainly used for optimization program and design fields on the
traction substation lightning protection.
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