基于Matlab的站用电系统级差配合的建模与分析

Modeling and Analysis of Stage Difference Coordination for Substation Service Electrical System Based on Matlab

针对目前变电站站用变压器低压侧总断路器采用四段式保护增加级差配合复杂度问题,构建了基于Matlab的站用电系统断路器级差配合模型,计算了不同故障下各级断路器脱扣时间,分析了站用电系统的级差配合,以西王220kV变电站站用电系统为例验证了该模型的有效性,并提出调整低压侧总断路器四段保护脱扣电流整定值和脱扣时间的建议。

Most low-voltage side circuit breaker of auxiliary transformer adopts four-stage protection, which adds the complexity of stage difference coordination. The stage difference coordination for substation service electrical system is modeling based on Matlab. This model can analyze stage difference coordination result by calculating the trip time of each circuit breaker in different faults. Taking Xiwang 220 kV substation for an example, the effectiveness of this model is verified, and some suggestions that the trip setting current and trip time of low-voltage side circuit breaker fourstage protection should be adjusted is proposed.