中性線的轉換對UPS性能的影響和對策

摘要：由于低壓配電系統接地故障保護（GFP）的需要，市電與備用發電機組電源轉換電路，必須采用4極自動轉換開關（ATS），而有些4極ATS在轉換過程中存在中性線中斷現象，嚴重影響了UPS的正常運行，由此引發的UPS故障和負載停電事件越來越受到關注。本文分析電信和數據中心常用市電和備用發電機組電源轉換電路的性能，及其對GFP和UPS運行的影響，提出工程實用解決方案。 敘詞：中性線轉換 接地故障保護 4極ATS 中性線中斷 重疊中性線轉換 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,