線路用避雷装置による柱上変圧器の雷害防止対策

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タイトル別名
  • Lightning Protection Effects of Surge Arresters for Pole Transformers
  • センロヨウヒライ ソウチ ニ ヨル チュウジョウ ヘンアツキ ノ ライガイ ボウシ タイサク

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The outage ratio of pole transformers reaches to approximately 40% of total distribution line equipment outages. Then, it is necessary to develop an effective prevention method for pole transformers against lightning.<br> In this paper, we clarified the relation between a lightning current and an induced voltage of a pole transformer caused by lightning current, and examined the lightning protection effects of surge arresters for a pole transformer. The main results are as follows:<br>1)The length of the grounding conductor from an arrester to a transformer mounting bracket has a significant influence on the protection of transformers. In the case that surge arresters are installed on every second pole and the value of grounding resistance of grounding conductor is 30Ω, 80% of direct lightning hits do not damage a transformer with a 2.5m-long grounding conductor.<br>2)Even if the grounding resistance of the grounding conductor is as high as 200Ω, a good protection effect is obtained. In the case that surge arresters are installed on every second pole, 70% of direct lightning hits do not damage a transformer with a 2.5m-long grounding conductor.

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