The analysis and calculation on system frequency changing, oscillating and symmetrical fault offers reference for choosing arithmetic of digital negative sequence unbalance output in relay protection.

  • 分析计算这2种方法在系统频率变化和振荡以及三相故障时的负序不平衡输出,为数字式负序滤过器的算法选择和继电保护中负序不平衡量的定值整定提供依据。

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