If Negative Phase Sequence protection is not being used it can still be configured to provide an alarm when the NPS current exceeds the trip current setting. This alarm generates an Event Log record or could be assigned to an IOEX output or SCADA alarm point. This alarm could be used to monitor out of balance currents on the system.
Operators can now introduce a time delay between pressing either the Trip or Close buttons and the Recloser or Load Break Switch actual operation of. This feature can be useful wit.... more
