CAJ | 학술논문

220kV变电站是电力系统中的重要组成部分，当系统内部发生单相短路故障时，过大的短路电流会对变压器的安全造成极大的威胁，而在变压器中性点加装小电抗是限制故障电流的有效方法。本文首先列举了2台并联220kV变压器的4种中性点接地方式，然后介绍不同中性点接地方式下小电抗值的选择方法，最后通过对某地区110kV系统的PSCAD仿真来验证加装小电抗对限制单相短路电流的作用，并给出限制短路电流的最优解决方案。
220kV변전참시전력계통중적중요조성부분，당계통내부발생단상단로고장시，과대적단로전류회대변압기적안전조성겁대적위협，이재변압기중성점가장소전항시한제고장전류적유효방법。본문수선열거료2태병련220kV변압기적4충중성점접지방식，연후개소불동중성점접지방식하소전항치적선택방법，최후통과대모지구110kV계통적PSCAD방진래험증가장소전항대한제단상단로전류적작용，병급출한제단로전류적최우해결방안。
220kV transformer is one of the most importance parts of power grid.The strong short-circuit current causing great threat to the safety of transformer when it occurs a single-phase short.Instal ing a low reactance on the neutral point of transformer is an effective way.This paper lists four neutral grounding moods of 220kV transformer and introduces how to choose the magnitude of low reactance in different neutral grounding moods. At last we use PSCAD to simulate the affect to short-circuit current and give the best way to limit it.