UOV Close Blocking Operation

UOV Close Blocking is only operationally effective when either UOV protection is enabled and configured to TRIP for the active protection group.

For an UOV element to apply a Close Block, all of the following must be true:

• Protection On

• UOV Protection Available

• Close Blocking Available

• UOV Close Blocking On

• The element is in a faulted state that is in pickup

• The element is configured to TRIP

An UOV element will remove its Close Block if:

• Protection is turned Off

• The element is disabled

• Close Blocking is Not Available

• The UOV Close Block is Off (for the active group)

• The element is not configured to Trip

• The element is un-faulted that is not in a pickup state.

It is important to note that UOV Close Blocking differentiates between Under and Over Voltage. If Under Voltage Trip is enabled but Over Voltage is either Off or set for Alarm.