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                    主變大修受潮分析及防范措施探討

                    時間:2024-08-20    點擊量:20

                    0 引言

                     某 110 kV 變 電 站 的 #2 主 變, 是 型 號 為 SSZ10- 50000/110,油浸自 冷(ONAN)的三繞組變壓器,由 江 蘇 華鵬變壓器有限公司2003年 制 造,運行至大修時已有11 年,按省公司的變壓器評估情況,需對該主變進行吊罩解 體性大修。 

                    1 現場情況分析

                     現場檢修過程中,根據大修方案對該變壓器進行了一 次排油、吊 罩 檢 查、真 空 注 油 及 熱 油 循 環;在 修 后 試 驗 中,發現絕緣電阻較修前偏低;將變壓器油送檢,發現油 務試驗中微水 含 量 不 合 格,油擊穿電壓低于規定值 (110 kV 變壓器應不大于20 mg·L-1,油擊穿電壓不低于40 kV)。大修前后試驗結果對比見表1。 由表1可知,變壓器本體油中的微水含量明顯增加, 表明變壓器油在大修過程中受到潮氣的影響。由于水分在 交、直流電場作用下產生損耗,導致通過交流電場測量的 絕緣電阻和介損以及通過直流電場測試的泄漏電流的試驗 結果數據均出現了明顯變化,試驗數據顯示介損和直流泄 漏電流的結果較修前明顯偏高,絕緣電阻明顯偏低,判斷 均由變壓器在大修過程中受潮引起。吊罩當天天氣晴好(溫 度31 ℃,濕 度20%),排 除 吊 罩過程中器身進水的可能性。查核注入新油的油質試驗報 告,所注新油 均 為 合 格 油,微水含量均在標準(15μL/L) 范圍內,所以也排除油受潮的可能性。檢查濾油機、儲油 罐及管路,通過詢問得知濾油機及管路在此次使用前沒有 按規定進行認真的清洗和檢查,在使用儲油罐前也沒有檢 查罐底是否有積水,在本次大修前下過大雨,很有可能致 使儲油罐及管路受潮、積水;隨后檢查濾油機,發現其粗 過濾器及一級精密過濾器長期未更換,內部有較多雜物, 濾油機使用前也沒有通過排污閥放水,蓄水器內水量較 多。

                    綜上分析,判斷該主變檢修后受潮的原因是未經清掃 的儲油罐及管路中的潮氣和水珠在帶油沖洗時進入本體循 環,且濾油機長期未更換濾芯,油流受阻,致使脫水過濾 能力下降。 針對以上分析,對濾油機進行清潔,更換了濾油機的 濾紙,并再次進行一次熱油循環,時間為12h。第2次熱油循環后的試驗數據見表2。

                    經再次熱油循環,絕緣電阻和介損已恢復正常,但微 水含量仍不合格。懷疑潮氣沒有濾除干凈,決定延長熱油 循環時間,又進行了一次時長為6h的熱油循環,但微水 含量與之前沒有區別。 按照理論,隨著溫度的升高,絕緣材料中的吸附水會 逐漸析出,在熱油循環后,高壓試驗結果中絕緣電阻和介 損都有上升,因此微水含量不可能沒有變化。對現場取油 過程進行排查后發現問題,現場工作人員取油時未按照規 程操作,沒有使用注射器取油,而是采用磨口瓶直接從取 油口取油,取油當天空氣潮濕,導致送檢的油出現了上述 的試驗結果。現場使用注射器取油,油樣試驗結果表明油 中微水含量正常。第3次濾油后采用磨口瓶和注射器取油 樣試驗結果對比見表3。

                    2 防范受潮的措施

                     主變大修過程中任何一個環節出現紕漏都有可能導致 嚴重的后果。總結本次大修的教訓,并結合歷年主變大修 的經驗,提出大修過程中主變受潮的防范措施及建議。 

                    2.1 加強管理

                     應加強變壓器大修油處理裝備(濾油機、油罐、油管) 的日常維護管理,將設備存放到倉庫時,應檢查各管道接 頭和密封面防水措施是否完整可靠;遇到機具外借的情 況,在外借后還回接收時,接收人員必須檢查防水措施情 況。特別在大修前,需要再次檢查儲油罐和油管內部是否 存在積水。

                     2.2 濾油機日常維護

                     濾油機的過濾效果無法實時觀察,且熱油循環時間通 常較長,因此濾油機存在缺陷時,將 耗 費 大 量 現 場 的 時 間。為此,應定期維護濾油機,定 期 更 換 濾 芯、真 空 泵 油,每年應在主變大修高峰期到來前進行一次徹底保養維 護,消除遺留缺陷,確保設備處于完好狀態。

                    2.3 防止殘油污染

                     機具使用前必須清楚上一次的使用履歷,防止殘油誤 混用造成污染。將機具運到檢修現場后,必須督促施工人 員對油罐、濾油機進行檢查清潔,避免內部殘油污染。

                     2.4 新油試驗 

                    大修用的補充油(新油)必須按照規定提前抽檢。抽檢 補充油(新油)時必須從底部取油,并根據要求決定是否做 油簇組成和混油試驗項目。新油到現場,必須提前用真空 濾油機處理合格后才允許和本體油混合。

                     2.5 現場攜帶便攜式試驗設備

                     在大修過程中會遇到油務試驗不合格的情況,如果現 場沒有便攜式油耐壓儀,就需要到距離變電站較遠的市供 電公司的試驗部門進行油務試驗,多次往返,在路途中耗 費大量時間,影響現場的工作效率。為此,主變大修過程 中進行油處理時,建議攜帶便攜式油耐壓儀,方便對油處 理效果進行檢查,實時把控變壓器油的狀態。

                     2.6 大修過程中的防潮措施

                     主變大修過程中應做好管道接頭、注油排油閥門的防 雨措施,拆下的油管口必須用干凈破布堵塞,并用塑料布 包裹嚴密,在室外存放時還必須覆蓋帆布,防止進水。 

                    2.7 有載調壓開關濾芯問題

                     有載調壓開關在線濾油裝置濾芯,運行單位基本沒換 過,已經飽和失效,應結合主變大修予以更換。在配備小 型濾油機前,可以攜帶板式濾油機,專門處理有載調壓開 關油路水分超標問題。

                     2.8 采取正確的取樣方法

                     現場作業人員應嚴格按照標準取 樣,即 GB75597— 1987 《電力用油(變 壓 器 油、汽 輪 機 油)取 樣 方 法》。以 微 水含量測試為例,未使用注射器取樣,可能造成油中微水 含量試驗結果有10mg·L-1左右的偏差。

                     3 結語 變壓器的絕緣材料易吸收水分而受潮,水分侵入后使 其絕緣性能變差發生故障。在主變大修過程中有可能由于 濾油機、油罐等機具維護管理不當,或未經處理的不合格 補充油(新油)與本體油混用等原因,變壓器絕緣性能會出 現下降,甚至還 不 如 大 修 前。為了保證變壓器安全運行, 有必要采取一定措施對大修的全過程進行嚴格管控。

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