优化线路零序电流保护整定计算的技术措施

Technical measures of optimizing line zero-sequence current protection setting

为了提高继电保护整定计算的速度和效率,给出了优化线路零序电流保护整定计算的方法。包含对网络操作时,用补偿法修改阻抗矩阵元素;对影响零序Ⅰ段及各延时段分支系数计算的主要因素:故障点、故障类型、运行方式以及避免各延时段分支系数重复计算问题作了分析,并详述了合理的选择方法。这些方法有助于减少整定计算的工作量、减少整定计算的盲目性、极大地增加对整定计算程序开发的实用性。

To improve the speed and efficiency of setting calculation to relay protection of power system,the paper puts forward reasonable ways of setting calculation for transmission line zero-seqence current protection. Compensating algorithm is used to avoid whole network matrix elements modified when network line is opened. The main reasons for influence zero-sequnee current protection Ⅰ and zero sequence branch confidence protection Ⅱ, Ⅲ, Ⅳ are analyzed, including how to reasonably select fault points ,fault styles, and operating modes and avoid repeat calculating branch coefficients. These ways are helpful to decrease workload and aimless calculation and to improve practicability of program for setting calculation.