rack integrity Cell condition of all individual battery cells (where visible) continuity terminal connection resistance cell-to-cell resistance (where available to measure) Every 6 calendar years, perform/verify the following: Battery performance test (if ohmic tests are not opted) Verify that each trip coil is able to operate the circuit breaker, interrupting device, or mitigating device For electromechanical lock-out relays, electrical operation of electromechanical trip Every 12 calendar years, verify the following: Microprocessor relay settings are as specified Operation of the microprocessor’s relay inputs and outputs that are essential to proper functioning of the Protection System Acceptable measurement of power system input values seen by the microprocessor protective relay Verify that current and voltage signal values are provided to the protective relays Protection System component monitoring for the battery system signals are conveyed to a location where corrective action can be initiated The microprocessor relay alarm signals are conveyed to a location where corrective action can be initiated Verify all trip paths in the control circuitry associated with protective functions through the trip coil(s) of the circuit breakers or other interrupting devices Example #2: A combination of monitored and unmonitored components within a given Protection System might be: A microprocessor relay with integral alarm that is not connected to SCADA. (unmonitored) Current and voltage signal values, with no monitoring, connected as inputs to that relay. (unmonitored) A Vented Lead-Acid battery with a low voltage alarm for the station dc supply voltage and an unintentional grounds detection alarm connected to SCADA. (monitoring varies) A circuit breaker with a trip coil, with no circuits monitored. (unmonitored)
rack integrity Cell condition of all individual battery cells (where visible) continuity terminal connection resistance cell-to-cell resistance (where available to measure) Every 6 calendar years, perform/verify the following: Battery performance test (if ohmic tests are not opted) Verify that each trip coil is able to operate the circuit breaker, interrupting device, or mitigating device For electromechanical lock-out relays, electrical operation of electromechanical trip Every 12 calendar years, verify the following: Microprocessor relay settings are as specified Operation of the microprocessor’s relay inputs and outputs that are essential to proper functioning of the Protection System Acceptable measurement of power system input values seen by the microprocessor protective relay Verify that current and voltage signal values are provided to the protective relays Protection System component monitoring for the battery system signals are conveyed to a location where corrective action can be initiated The microprocessor relay alarm signals are conveyed to a location where corrective action can be initiated Verify all trip paths in the control circuitry associated with protective functions through the trip coil(s) of the circuit breakers or other interrupting devices Example #2: A combination of monitored and unmonitored components within a given Protection System might be: A microprocessor relay with integral alarm that is not connected to SCADA. (unmonitored) Current and voltage signal values, with no monitoring, connected as inputs to that relay. (unmonitored) A Vented Lead-Acid battery with a low voltage alarm for the station dc supply voltage and an unintentional grounds detection alarm connected to SCADA. (monitoring varies) A circuit breaker with a trip coil, with no circuits monitored. (unmonitored)