影响电力系统短路计算结果的原因分析  

Influencing factors on short circuit calculation in power systems

作　　者：姚玉斌[1] 晋文转 宋学清[3] 李洪 

机构地区：[1]大连海事大学自动化与电气工程学院,辽宁大连116026 [2]许继集团公司,河南许昌461000 [3]烟台东方电子信息产业股份有限公司,山东烟台264001 [4]烟台市产品质量监督检验所,山东烟台264000

出　　处：《继电器》2006年第11期12-16,20,共6页Relay

摘　　要：电力系统短路计算是电力部门经常进行的基本计算,其计算结果是设备选择、继电保护定值整定的依据。无论使用调度自动化中的短路计算软件,还是使用继电保护定值整定软件,各种软件或算法的计算结果可能出现差异。产生差异的原因较多,分析表明主要原因有:(1)近似计算中各节点的正序正常电压处理不一致;(2)近似计算中变压器模型的等值阻抗处理方法不同;(3)详细计算中,由于未考虑分接头影响,至使变压器模型选择不当。变压器模型对短路计算的影响很大,建议采用C IM变压器模型,该模型具有原理正确和使用方便的特点。Short circuit current calculation in power systems is a kind of basic calculation that frequently used, the results of short circuit calculation is the foundation for electrical device selecting and protection setting. The results of short circuit current calculation program in energy management system are sometimes different from those of protection setting software. There are many reasons for the causing of these differences. The main reasons as follows are studied. Different normal positive voltage is used by different program in approximate calculation, the equivalent impedances of transformers are treated differently in approximate calculation, and the transformer model is improperly selected in detailed calculation due to neglect of the impact of tap-changing on the equivalent impedance. The transformer model can greatly affect the results of short circuit current calculation, it is proposed that the transformer model in CIM be used in power system application, as this model is correct and convenient.

关 键 词：短路计算 近似短路计算 变压器模型 等值阻抗 

分 类 号：TM713[电气工程—电力系统及自动化]