CAJ | 학술논문

发变电站内发生短路故障时真正引起危害的是入地故障电流，而不是短路故障电流；当前已有的数值算法及软件或存在一定的技术性门槛，或在表征系统方面存在不足。提出一种适用于不同电压等级的复杂电力系统分流系数计算方法，推导并拓展了基于相分量的变压器导纳模型，将其应用于回路电流法，计算出电流分布及分流系数；通过与商业软件CDEGS进行比较，验证了该算法的正确性。作为应用，还定量分析了考虑变压器故障侧和非故障侧同时分流对分流系数的影响，指出了准确计算分流系数时变压器是不可或缺的系统元件。
발변전참내발생단로고장시진정인기위해적시입지고장전류，이불시단로고장전류；당전이유적수치산법급연건혹존재일정적기술성문함，혹재표정계통방면존재불족。제출일충괄용우불동전압등급적복잡전력계통분류계수계산방법，추도병탁전료기우상분량적변압기도납모형，장기응용우회로전류법，계산출전류분포급분류계수；통과여상업연건CDEGS진행비교，험증료해산법적정학성。작위응용，환정량분석료고필변압기고장측화비고장측동시분류대분류계수적영향，지출료준학계산분류계수시변압기시불가혹결적계통원건。
While a short circuit fault happens in a power substation, it is the current diffusing into ground that actually causes the safeness trouble instead of the fault current. Most of the current numerical methods and software are required to cross the technical threshold, or have limitations in characterizing the power system. The paper presented a numerical method to calculate the shunt coefficient for the complex power system with different voltage levels, and derived the admittance matrix for a phase-coordinate transformer model which is applicable for the loop current method. The method was verified by comparison with commercial software CDEGS. It has been applied to analyzing the effect of the transformer, and the result shows that the transformer is an essential system component for the calculation of shunt coefficient.