GE Feeder Management Relay 750 Instruction Manual

8-26 750/760 Feeder Management Relay GE Multilin8.4 PROTECTION SCHEMES 8 COMMISSIONING TESTS89. Repeat Steps 1 through 7, substituting Vbn for Van, Vcn for Vbn and Van for Vcn.The following procedure checks Pickup with Three Phases For Operation:1. Inject Van = Vbn = Vcn = a voltage between the MIN OPERATING VOLTAGE and the pickup voltage into the bus voltageinput of the relay. The Pickup LED should be on.2. Slowly raise Van until the Pickup LED goes out. This reset voltage should be the pickup value plus 2% of VT.3. Reduce Van until the Pickup LED comes on. This is the pickup voltage of Van.4. Slowly raise Vbn until the Pickup LED goes out. This reset voltage should be the pickup value plus 2% of VT.5. Reduce Vbn until the Pickup LED comes on. This is the pickup voltage of Vbn6. Slowly raise Vcn until the Pickup LED goes out. This reset voltage should be the pickup value plus 2% of VT.7. Reduce Vcn until the Pickup LED comes on. This is the pickup voltage of Vcn.8. Lower Van until the Pickup LED goes out. This is the MIN OPERATING VOLTAGE of Van minus 2% of VT.9. Slowly raise Van until the Pickup LED comes on. This is the MIN OPERATING VOLTAGE level.10. Reduce Vbn until the Pickup LED goes out. This is the MIN OPERATING VOLTAGE of Vbn minus 2% of VT.11. Slowly raise Vbn until the Pickup LED comes on. This is the MIN OPERATING VOLTAGE level.12. Reduce Vcn until the Pickup LED goes out. This is the MIN OPERATING VOLTAGE of Vcn minus 2% of VT.13. Slowly raise Vcn until the Pickup LED comes on. This is the MIN OPERATING VOLTAGE level.b) BUS UNDERVOLTAGE (DELTA VTS ONLY)To test Bus Undervoltage for Delta VTs, use the test connections specified in Figure 8–2: Relay Test Wiring – Delta Con-nection on page 8–3.The following procedure tests Pickup with One Phase For Operation:1. Inject Vab = Vcb = nominal voltage into the bus voltage input of the relay. The Pickup LED should be off.2. Slowly lower Vab until the Pickup LED comes on. This is the pickup voltage.3. Continue to lower Vab until the Pickup LED goes out. This is the MIN OPERATING VOLTAGE minus 2% of VT.4. Raise Vab until the Pickup LED comes on, and continue to increase until the indicator goes out. This is the reset volt-age, which should be the pickup value plus 2% of VT.5. Repeat Steps 1 through 4 except adjust Vbc.The following procedure tests Pickup with Two or Three Phases For Operation:1. Inject Vab = nominal voltage and Vcb = a voltage between the MIN OPERATING VOLTAGE and the pickup voltage into thebus voltage input of the relay. The Pickup LED should be on.2. Slowly raise Vcb until the Pickup LED goes out. This reset voltage should be the pickup value plus 2% of VT.3. Reduce Vcb until the Pickup LED comes on. This is the pickup voltage of Vcb.4. Continue to lower Vcb until the Pickup LED goes out. This is the MIN OPERATING VOLTAGE of Vcb minus 2% of VT.5. Slowly raise Vcb until the Pickup LED comes on. This is the MIN OPERATING VOLTAGE level.6. Reduce Vab until the Pickup LED goes out. This is the MIN OPERATING VOLTAGE of Vab minus 2% of VT.7. Slowly raise Vab until the Pickup LED first comes on and then goes out. This is the reset voltage, which should be thepickup value plus 2% of VT.8. Lower Vab until the Pickup LED comes on. This is the pickup voltage of Vab.c) BUS UNDERVOLTAGE (WYE AND DELTA VTS)To test Bus Undervoltage for Wye and Delta VTs, use the test connections specified in Figure 8–1: Relay Test Wiring – WyeConnection or Figure 8–2: Relay Test Wiring – Delta Connection on page 8–3.The procedures for testing Indications and Operations are the same as those outlined for Phase TOC 1 on page 8–16.The following procedure tests Blocking From Logic Inputs: