抽水蓄能电站500 kV变压器接地套管渗油原因分析与处理
Cause Analysis and Treatment of Oil Leakage in the Grounding Ushing of a 500 kV Transformer in a Pumped Storage Power Station
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摘要: 介绍了某抽水蓄能电站5号500 kV变压器铁芯和夹件套管渗油问题，通过对铁芯夹件接地套管结构的认真研究分析，找到了套管渗油的主要原因，提出了紧固螺栓、更换纯瓷套管、调整导电杆垂直度和更换密封的指导意见，为解决变压器接地套管渗油问题提供解决方案。针对某抽水蓄能电站500 kV变压器铁芯和夹件接地套管渗油问题，从接地套管的现场运行、检修及结构进行分析研究，找到接地套管渗油的原因，结合变压器排油内检与检修，运行2年多以来铁芯夹件套管无渗漏，消除了变压器接地套管渗油问题。为防止现场施工人员磕碰损坏铁芯夹件接地套管，建议铁芯夹件通过瓷套管引出接地类似结构的变压器，在其上部安装一个防护罩。在多次处理铁芯夹件套管渗油无果后，不能把原因仅认为是螺栓松动或密封老化，应从多方面多维度去考虑分析问题。首先研究分析接地套管的结构，并进行接地套管的受力分析，需将导电杆掰直，接地套管及密封圈换新，最终解决铁芯夹件接地套管渗油问题，对于后续类似问题的分析和处理具有借鉴意义。Abstract: This paper introduces the oil leakage issue of the core and clamping part bushing on the No.5 500 kV transformer at a pumped storage power station. Through in-depth research and analysis of the structure of the core and clamping part grounding bushing, the main causes of the oil leakage are identified. Targeted guidance measures, including tightening bolts, replacing the plain porcelain bushing, adjusting the verticality of the conductive rod and replacing the seals, are proposed, which provides a solution for addressing the oil leakage problem of transformer grounding bushings.
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