油田井场变压器接地方式及接地参数对防雷效果的影响分析

Effect of Grounding Mode and Parameters of Oil Field Transformer on Lighting Protection Performance

井场变压器是油田供电系统中的关键设备,因多数分布在野外,易遭受雷击而损坏。本文先介绍了井场变压器防雷的基本措施,然后重点分析了单独接地和"三点共地"接地方式对防雷效果的影响,并依据理论计算阐述了接地引下线电感值和接地电阻值等参数对雷击过电压的影响,得到了井场变压器应采用"三点共地"接地方式,缩短接地引下线以及杜绝"绕杆"现象的结论。最后,通过仿真证明了结论的正确性。

Transformers are the key apparatus in the oil field power system. For most transformers are placed outdoors, the lighting accidents happen frequently. This paper introduces the lighting protection measures for the transformers in oil field and analyzes the grounding mode, including the arrester, transformer shell, the neutral point of low voltage side grounding independently and grounding together. And it focuses on the effect of grounding mode on the lighting protection performance. Meanwhile, it calculates the effect of the grounding wire reactance and grounding resistance theoretically. Then, it comes to the conclusion that it is propitious for improving the lighting protection performance by grounding together mode and reducing the grounding reactance and resistance. In the end, the simulating results prove the validity of the analysis conclusion.