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Condition of system and protection setting coordination by adopting double power lines parallel operation
Author(s): 
Pages: 64-65,75
Year: Issue:  10
Journal: RELAY

Keyword:  双回线并列运行方式变压器相间后备保护整定时间计算导则;
Abstract: 对于110 kV及以下电力系统,由于采用双回线并列运行方式,可引起中心变电站的变压器相间后备保护跳变压器开关时间与跳母联开关的时间不配合.在母线保护退出或出线保护(开关)拒动情况下,有可能引起中心变电站整个母线失压.因此整定变压器相间后备保护动作时间,不应简单片面地引用《大型发电机变压器继电保护整定计算导则》,而应结合运行方式,对有双回线并列运行方式的,变压器相间后备保护跳变压器开关时间应按与跳母联开关时间和双回线对端有灵敏度保护动作时间相继动作相配合,避免扩大事故停电范围.
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