Reference: A938
Index: B
Page 59
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Instruction Manual – NPS914 Alarm and Indication IED
Blocking and interlocking
The interlocking and blocking conditions can be set for each controllable object, with Open and Close set
separately. Blocking and interlocking can be based on any of the following: other object statuses, a
software function or a digital input.
The image below presents an example of an interlock application, where the closed earthing switch
interlocks the circuit breaker close command.
Figure. 6. - 2. Example of an interlock application.
In order for the blocking signal to be received on time, it has to reach the function 5 ms before the control
command.
