PKR39809-02

Loss of Phase Protection

Loss of Phase protection (LOP) is a voltage operated element that can detect faults upstream of the ACR.

LOP protection operates when the phase to earth voltage on one or two phases falls below a user defined LOP Voltage for a user defined LOP Timeout period. LOP can either trip the switchgear or generate an alarm depending on the mode selected.

An LOP protection trip will always cause the ACR to go to Lockout. That is, no automatic reclose can occur.

LOP protection will also operate after the Loss of Phase Timeout if one or two phases become live after all three were dead.

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