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New longitudinal differential protection scheme for four-circuit transmission line with different voltage grades
Author(s): 
Pages: 72-79
Year: Issue:  18
Journal: Relay

Abstract: 为克服传统纵联差动保护运用在不同电压等级的同杆四回线中容易受到耦合电感的影响,提出了基于反序负序差电流的纵联差动保护方案.不同电压等级的四回线由两个不同电压的等级的同杆双回线构成.对于同杆双回线路,当线路参数完全对称时,系统正常运行或是外部故障时,反向电流分量为零;而当双回线内部故障时,反向环流量存在于双回线的内部,双回线两侧反向电流之和比较大,可以构成基于反向环流量的纵联差动保护.该保护方案不仅...
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