基于零序接地阻抗的三相等效电路模型及短路开断过程计算  

Modeling of Three-Phase Equivalent Circuit and Calculation of Short Circuit Current Interruption Based on Zero Sequence Grounding Impedance

作　　者：贾转转 张云飞[1] 赵福强[1] 冯建强[1] 

机构地区：[1]西安高压电器研究院有限责任公司,陕西西安710077

出　　处：《电器与能效管理技术》2017年第15期43-46,共4页Electrical & Energy Management Technology

摘　　要：对称分量法是分析与计算三相不对称电路最为有效的经典方法之一。以对称分量法分解得到的正序、负序、零序分量为基础,提出了合并正序、负序分量为相序分量。应用相序分量、零序分量的方法推导出基于零序接地阻抗的三相等效电路模型,应用该等效电路计算了中性点有效接地系统、中性点不接地系统的三相短路电流开断过程。最后,根据系统中不同的正序阻抗与零序阻抗的比值,在等效电路的基础上,对首开极系数与电流过零点时刻、燃弧窗口分别进行了计算与讨论。Symmetrical component method is one of the most effective methods to analyze and to calculate three-phase asymmetric circuit.Based on the positive sequence,negative sequence and zero sequence components solved by symmetrical component method,a combination of positive sequence and negative sequence components as a phase sequence component was proposed.The equivalent circuit based on zero sequence grounding impedance was derived by applying the phase sequence and zero sequence components method,and was used to calculate the threephase short-circuit current interruption.Finally,first-pole-to-clear factor and current zero crossing were calculated and discussed with different ratios between positive sequence impedance and zero sequence impedance.

关 键 词：对称分量法 零序接地阻抗 电流过零点 首开极系数 

分 类 号：TM76[电气工程—电力系统及自动化]