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干式變壓器接線方式

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干式變壓器接線方式

發布日期:2018-06-08 作者:江蘇鶴都電器有限公司 點擊:

  干式變壓器的過載能力與環境溫度、過載前的負載情況(起始負載)、變壓器的絕緣散熱情況和發熱時間常數等有關,若有需要,可向生產廠索取干變的過負荷曲線。如何利用其過載能力呢?筆者提出兩點供參考:   

  (1)選擇計算變壓器容量時可適當減小:充分考慮某些軋鋼、焊接等設備短時沖擊過負荷的可能性--盡量利用干式變壓器的較強過載能力而減小變壓器容量;對某些不均勻負荷的場所,如供夜間照明等為主的居民區、文化娛樂設施以及空調和白天照明為主的商場等,可充分利用其過載能力,適當減小變壓器容量,使其主運行時間處于滿載或短時過載。   

  (2)可減少備用容量或臺數:在某些場所,對變壓器的備用系數要求較高,使得工程選配的變壓器容量大、臺數多。而利用干變的過載能力,在考慮其備用容量時可予以壓縮;在確定備用臺數時亦可減少。變壓器處于過載運行時,一定要注意監測其運行溫度:若溫度上升達155℃(有報警發出)即應采取減載措施(減去某些次要負荷),以確保對主要負荷的安全供電。

  干式變壓器接線方式:

  1、短接變壓器的“輸入”與“輸出”接線端子用兆歐表測試其與地線的絕緣電阻。1000V兆歐表測量時,阻值大于2M歐姆。   

  2、變壓器輸入、輸出電源線截面配線應滿足其電流值大小的要求;按照2-2.5A/min2電流密度配置為宜。   

  3、輸入、輸出三相電源線應按變壓器接線板母線顏色黃、綠、紅分別接A 相、B 相、C 相,中性零線應與變壓器壓器中性零線相接,接地線與變壓器外殼(如變壓器有機箱應與箱體地線標志對應相連接)。檢查輸入輸出線,確認正確無誤。   

  4、先空載通電,觀察測試輸入輸出電壓符合要求。同時觀察機器內部是否有異響、打火、異味等非正常現象,若有異常,請立即斷開輸入電源。   

   5、當空載測試完成且正常后,方可接入負載。

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