干式變壓器匝間短路引起的調相機跳閘故障分析
張鈺1,楊曉慧2,趙凱強1
(1 江蘇方天電力技術有限公司,江蘇 南京 211102;2 中國能源建設集團江蘇省電力設計院有限公司,江蘇 南京 211102)
摘 要:介紹了一起特高壓換流站調相機勵磁系統(tǒng)的一臺小型干式變壓器匝間短路故障引起的機組跳閘事件。分析了保護動作情況及現(xiàn)場設備檢查情況,通過對故障變壓器進行相關測試及返廠解體檢查,得出此次調相機組跳閘故障的直接原因是勵磁系統(tǒng)內同步變壓器繞組匝間短路故障,提出了對后續(xù)投運的調相機系統(tǒng)相關設備在出廠、調試、運行等方面建議,為特高壓交直流系統(tǒng)旋轉設備安裝調試、驗收、運維、檢修提供參考。
關鍵詞:變壓器;匝間短路;調相機;轉子接地
中圖分類號:TM412 文獻標識碼:B 文章編號:1007-3175(2019)12-0042-03
Analysis of Synchronous Condenser Tripping Fault Caused by Turn-To-Turn Short Circuit of Dry-Type Transformer
ZHANG Yu1, YANG Xiao-hui2, ZHAO Kai-qiang1
(1 Jiangsu Frontier Electric Power Technology Co., Ltd. Nanjing 2111 02, China;
2 China Energy Engineering Group Jiangsu Power Design Institute Co., Ltd, Nanjing 2111 02, China)
Abstract: Introduction was made to a synchronous condenser tripping fault caused by the turn-to-turn short circuit of a small dry-type transformer in extra-high voltage converter substation. This paper analyzed the protective action and field equipment inspection conditions. The fault transformer was carried out the relevant test and strip inspection to find that the immediate cause leading to the synchronous condenser tripping fault was the synchronous transformer winding turn-to-turn short circuit fault. This paper gave some advices of leave factory, debugging and operation etc, which provides references for the installation and debugging, acceptance inspection, operation and maintenance and overhaul of EHV AC/DC system rotating equipment.
Key words: transformer; turn-to-turn short circuit; synchronous condenser; rotor grounding
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