10 kV線路低頻減載誤動問題分析及改進
王彩麗，王俊輝，白海松，李海瑤，胡明會
（許繼電氣股份有限公司，河南 許昌 461000）
摘 要：針對某站10 kV 線路低頻減載發生誤動作情況，通過對動作報告、錄波、測頻、保護邏輯進行分析，認為誤動作是由于PT 飽和產生分頻分量及保護邏輯設計不合理造成的。提出針對性的邏輯優化方案，通過現場問題驗證，解決了誤動問題，并列舉常見低頻減載誤動作情況及防誤措施，避免再次發生低頻減載誤動作。
關鍵詞：低頻減載；PT 飽和；分頻諧振；誤動作；防誤措施
中圖分類號：TM773 文獻標識碼：B 文章編號：1007-3175(2017)10-0048-03
Misoperation Problem Analysis and Improvement of 10 kV Line Low Frequency Load Shedding
WANG Cai-li, WANG Jun-hui, BAI Hai-song, LI Hai-yao, HU Ming-hui
（Xuji Electric Co., Ltd, Xuchang 461 000, China）
Abstract: In allusion to the misoperation situation happening in certain station of 10 kV line low frequency load shedding, this paper analyzed the action report, the wave recording, the frequency measurement and the protection logic to find that the malfunction was caused by the fractional frequency component produced by PT saturation and the unreasonable design of protection logic. This paper proposed the specific logic-optimized scheme, solved the problem of the misoperation by the site problem verification and enumerated the common low frequency load shedding misoperation situation and anti-misoperation measures to avoid the low frequency load shedding misoperation occurring again.
Key words: low frequency load shedding; PT saturation; fractional frequency resonance; malfunction; anti-misoperation measure
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