【作者】 王玉梅； 张展；

【Author】 Wang Yumei Zhang zhan (Henan Polytechnic University,School of the Electrical Engineering and Automation Henan Jiaozuo 454100)

【机构】 河南理工大学电气学院；

【摘要】 本人在教学过程中,发现学生对采用标幺制法计算多电压等级电力系统的短路电流难以掌握,而其在后序课程的学习乃至以后的工作中,仍然很重要。本文以应用欧姆定律求多电压等级电力系统短路电流为目的,从求短路回路总阻抗不需要进行电压归算为突破口,详细地讨论了平均额定电压、标幺制法等概念;推导了多电压等级电力系统短路电流计算的欧姆定律标幺值形式和电气元件阻抗标幺值的简单算法。实践证明,将此理念用于教学,可使学生易于掌握标幺制法求多电压等级电力系统短路电流的精髓。更多还原

【Abstract】 It is found that it is difficult to master the method to calculate the short circuit current by using the power unit system under the multi-grade of voltages in the power system for the undergraduate students.This method is also important for the following courses studying and further practical working. Based on this purpose,the short circuit current is analyzed in the multi-grade of voltages in the power system by using ohm’s law in order to calculate the total impendence without voltage conversion.Firstly,the concepts about the rating average voltage and the per-unit system etc.are described in detail.Secondly the equation form about the power unit is described under the multi-grade voltages based on ohm’s law,and including the simple calculation method of electrical elements impendence power unit.The results show that, applying the method proposed in the paper to the practical teaching the students can easily master the content of the short circuit current in multi-grade voltage power system by using power unit system method.更多还原