南方电网技术
南方電網技術
남방전망기술
SOUTHERN POWER SYSTEM TECHNOLOGY
2013年
2期
45-48
,共4页
欧阳旭东%彭发东%喇元%李沛准
歐暘旭東%彭髮東%喇元%李沛準
구양욱동%팽발동%나원%리패준
500kV自耦变压器%中性点%小电抗%过电压%绝缘配合%选型
500kV自耦變壓器%中性點%小電抗%過電壓%絕緣配閤%選型
500kV자우변압기%중성점%소전항%과전압%절연배합%선형
500 kV autotransformer%neutral%low reactance%overvoltage%insulation coordination%model selection
500 kV自耦变压器中性点经小电抗接地是限制电网短路电流的有效手段.利用EMTPE对主变压器中性点接入小电抗后的过电压及绝缘配合进行研究.通过计算正常运行下中性点小电抗的工频及操作过电压水平,以及系统接地故障、合闸及重合闸等操作时小电抗上的操作过电压和暂态电流,确定了主变压器中性点MOA的参数配置,并总结了加装主变压器中性点小电抗的选型方法.
500 kV自耦變壓器中性點經小電抗接地是限製電網短路電流的有效手段.利用EMTPE對主變壓器中性點接入小電抗後的過電壓及絕緣配閤進行研究.通過計算正常運行下中性點小電抗的工頻及操作過電壓水平,以及繫統接地故障、閤閘及重閤閘等操作時小電抗上的操作過電壓和暫態電流,確定瞭主變壓器中性點MOA的參數配置,併總結瞭加裝主變壓器中性點小電抗的選型方法.
500 kV자우변압기중성점경소전항접지시한제전망단로전류적유효수단.이용EMTPE대주변압기중성점접입소전항후적과전압급절연배합진행연구.통과계산정상운행하중성점소전항적공빈급조작과전압수평,이급계통접지고장、합갑급중합갑등조작시소전항상적조작과전압화잠태전류,학정료주변압기중성점MOA적삼수배치,병총결료가장주변압기중성점소전항적선형방법.
It is an effective means to limit the short-circuit current by grounding the neutral point of 500 kV autotransformers with a low reactance. With the EMTPE software the paper investigates the over-voltage and insulation coordination of the low reactance as it being installed with the transformer neutral point. Calculating the power frequency and operation over-voltage of the low reactance under normal operation status as well as its over-voltage and transient current in the cases of grounding faults, switching on and reclosing, the paper determines the configuration parameters of MOA for the neutral point, and summarizes the model selection method of the low reactance.
