云南电力技术
雲南電力技術
운남전력기술
YUNNAN ELECTRIC POWER
2014年
5期
57-61
,共5页
中性点小电抗%交直流分量%投切方式%中性点刀闸
中性點小電抗%交直流分量%投切方式%中性點刀閘
중성점소전항%교직류분량%투절방식%중성점도갑
small reactor on the neutral points%AC and DC components%switch mode%earthing switch used on the neutral points
500 kV自耦变压器中性点加装小电抗是解决电网单相短路电流超标的有效措施之一。工程中需要分析主变中性点交直流分量，研究在投切过程中中性点的暂态电压变化，以此确定小电抗的投切方式。研究中以某500 kV变电站加装小电抗实际工程为例，实测变压器中性点的交直流数据，分析了中性点交直流分量的特点及其来源。通过仿真分析研究了投切电抗器带来的中性点的暂态电压变化，并给出了中性点刀闸的参数选择要求。
500 kV自耦變壓器中性點加裝小電抗是解決電網單相短路電流超標的有效措施之一。工程中需要分析主變中性點交直流分量，研究在投切過程中中性點的暫態電壓變化，以此確定小電抗的投切方式。研究中以某500 kV變電站加裝小電抗實際工程為例，實測變壓器中性點的交直流數據，分析瞭中性點交直流分量的特點及其來源。通過倣真分析研究瞭投切電抗器帶來的中性點的暫態電壓變化，併給齣瞭中性點刀閘的參數選擇要求。
500 kV자우변압기중성점가장소전항시해결전망단상단로전류초표적유효조시지일。공정중수요분석주변중성점교직류분량，연구재투절과정중중성점적잠태전압변화，이차학정소전항적투절방식。연구중이모500 kV변전참가장소전항실제공정위례，실측변압기중성점적교직류수거，분석료중성점교직류분량적특점급기래원。통과방진분석연구료투절전항기대래적중성점적잠태전압변화，병급출료중성점도갑적삼수선택요구。
An effective solution to reduce the single-phase short-circuit current is to install small reactors on the neutral points of the 500 kV autotransformers? During the practical project,the AC and DC component as well as the transient voltage of the neutral points should be studied in order to determine the switch mode of the small reactor? This paper gave an example of installing small reactors in a 500 kV substation,analyzed the characteristic and the source of the AC and DC value through the recorded data on the neutral point? The simulation research is done to find the transient voltage during the switching process of the small reactors,also the parameters of the earthing switch used on the neutral points is given out.
