某双侧电源甲乙输电线上装设了超范围闭锁式纵联保护，当乙侧的发信机发生故障不能发信时，试分析保护行为？

某双侧电源甲乙输电线上装设了超范围闭锁式纵联保护，当乙侧的发信机发生故障不能发信时，试分析保护行为？

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