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028-82712505

關鍵詞:諧波治理、有源電力濾波器、DVR電壓暫降調節器、SVG靜止無功發生器

技術支持/ Technical support

電網電壓波動有哪些不良后果

發布時間:2013-11-28點擊次數:2457

 


如不進行無功補償或補償不善將引起電壓波動。無功不足電壓下降,無功過剩電壓升高。我國規定供電電壓允許變化范圍為:35KV以上允許±5%,10KV以上允許±7%,低壓照明允許-7% ~ +5%用電設備要求比這些還要高些。如電機5%,如果超出這些范圍就會影響設備性能,縮短壽命。例如:熒光燈電壓升高1%,光通量將增大4%,如平均電壓提高5%,壽命將縮短50%。三相異步電機電壓降低或升高時都會引起電機過熱,使絕緣提前老化,甚至損壞。電壓下降10%時,電機啟動困難,嚴重發熱,電壓下降20%~30%時電機啟動不起來,甚至燒毀。一些精密加工設備及測試儀器,對電源電壓有嚴格要求,電壓的過大變化會損害設備,影響精度,出現錯誤信息,以致釀成重大事故。

大型電器啟動或關機時,對電源會產生巨大沖擊,一些機械設備本身就是沖擊負荷,如沖床、電焊機、挖掘機、電力機車等,從而使電網電壓產生閃變或瞬間波動,甚至引起其它設備失常工作或損壞。

良好的無功補償裝置,除進行無功補償外,還應能消除或衰減這些電壓有害

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