计及V/V牵引变压器的线路保护整定计算分析  

Analysis on the Setting Calculation of Line Relay Protection with V/V Wiring Traction Transformer

作　　者：侯瑞鹏[1] 杨明玉[1] 王新花 周庆捷 

机构地区：[1]华北电力大学电力系统保护与动态安全监控教育部重点实验室,河北保定071003 [2]北京中恒博瑞数字电力科技有限公司,北京100096

出　　处：《现代电力》2012年第6期47-50,共4页Modern Electric Power

摘　　要：随着电气化铁路的发展,大量V/V接线牵引变压器接入到电网中,这对电网保护的整定计算产生较大影响。本文基于相分量法对V/V接线牵引变压器低压侧短路时的短路电流进行分析,通过计算分析电源侧线路的距离保护相间阻抗元件和接地阻抗元件的最小测量阻抗和流过该保护的最大短路电流,得出在对线路距离保护和零序电流保护进行整定计算时,需要对其定值进行修正并给出定量的修正策略,有效地防止距离保护和零序电流保护的保护范围伸出牵引变低压侧,从而保证了距离保护和零序电流保护的选择性。With the development of electrified railway,a large number of v/v wiring traction transformers are applied to power grid,which has great impact on the setting calculation of relay protection for power grid.In this paper,phase components method is used to analyze the short-circuit current when short circuit fault occur at low-voltage side of v/v wiring traction transformers.Through calculating the minimum measuring impedances of phase-to-phase and grounding impedance components on lines of source side and the maximum short-circuit current flowing in the protection,it is needed to modify the setting values of distance protection and zero-sequence current protection.And the quantitative modified strategy is given,which can effectively prevent the protection range of distance protection and zero-sequence current protection from over reaching the low voltage side of traction transformer,and guarantee their selectivity.

关 键 词：相分量法 V V接线 整定计算 距离保护 零序电流保护 

分 类 号：TM773[电气工程—电力系统及自动化]