其它开关卡，例如7700型20通道差分复用模块，采用的是闭锁型继电器，无论是成对还是单独使用一个闸刀，偏移电压都是相同的。
Other CARDS, such as the Model 7700 20-channel Differential Multiplexer Module, use latching relays, and the offset voltage is the same whether the poles are used as a single pole or as a pair.
开关柜控制、测量及保护功能的要求以及其他闭锁和自动装置的要求。
Switchgear control, measurement and protection function requirements; other atresia and automatic device requirements.
开关柜门关闭且当闭锁状态解除后，才允许关合接地开关。
Only the switchgear door is closed, and closedown state is released, Permit that grounding switch is closed.
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