中性線的轉(zhuǎn)換對(duì)UPS性能的影響和對(duì)策

摘要：由于低壓配電系統(tǒng)接地故障保護(hù)（GFP）的需要，市電與備用發(fā)電機(jī)組電源轉(zhuǎn)換電路，必須采用4極自動(dòng)轉(zhuǎn)換開關(guān)（ATS），而有些4極ATS在轉(zhuǎn)換過程中存在中性線中斷現(xiàn)象，嚴(yán)重影響了UPS的正常運(yùn)行，由此引發(fā)的UPS故障和負(fù)載停電事件越來越受到關(guān)注。本文分析電信和數(shù)據(jù)中心常用市電和備用發(fā)電機(jī)組電源轉(zhuǎn)換電路的性能，及其對(duì)GFP和UPS運(yùn)行的影響，提出工程實(shí)用解決方案。 敘詞：中性線轉(zhuǎn)換 接地故障保護(hù) 4極ATS 中性線中斷 重疊中性線轉(zhuǎn)換 Abstract：In order to meet the needs of low voltage distribution system ground fault protection (GFP) the 4 pole automatic transfer switch (ATS) must be used for the transfer switch circuit between utility and standby generator set. But some of the 4 pole ATS use break before make neutral pole which can cause the neutral line interruption. The interruption of neutral line has serious impact on the UPS performance and even causes critical load power down, which has attracted more and more attention at present. This paper describes some transfer switch circuits used in telecommunication and data center, analyses their performance and the effect on GFP and UPS performance. And practical engineering solutions are also proposed. Keyword：Switching the neutral conductor, Ground fault protection, 4 Pole automatic transfer switch, Neutral line interruption, Overlapping neutral switching,