GE Feeder Management Relay 750 Instruction Manual

8-20 750/760 Feeder Management Relay GE Multilin8.4 PROTECTION SCHEMES 8 COMMISSIONING TESTS8For forward tripping and Wye connected VTs, use the test connections specified in Figure 8–1: Relay Test Wiring – WyeConnection on page 8–3 and use the following procedure:1. Set Van = Vbn = Vcn > MIN POLARIZING VOLTAGE setpoint at 0°, 120°, and 240°, respectively. Inject Phase A current of0.2 x CT at an angle which is in phase with the polarizing voltage. This angle is outside the tripping region, so trippingshould be blocked. If the function is set to “Control”, check that any output relays programmed for this condition areoperated. If the function is set to “Alarm”, check that the Alarm and Message LEDs are flashing, the correct PhaseDirectional Reverse alarm message is displayed, and any output relays programmed for this condition are operated.2. Slowly increase the angle of the Phase A current in the lagging direction. The directional element should detect currentflow in the tripping direction when the Phase A current is lagging the polarizing voltage by more than 90° ±2°. Thealarm and output relays should reset.3. Continue to increase the lagging angle until the alarm is again raised. The Phase A current should be lagging thepolarizing voltage by an angle of 270° ± 2°.4. Continue to increase the angle until the Phase A current is once again in phase with the polarizing voltage. The alarmshould remain.5. Repeat the above Steps 1 through 4 for current angle adjusted in each of Phases B and C.For forward tripping and Delta connected VTs, use the test connections specified in Figure 8–2: Relay Test Wiring – DeltaConnection on page 8–3 and use the following procedure:1. Set Vab = Vbc = Vca > MIN POLARIZING VOLTAGE setpoint at 0°, 120°, and 240°, respectively. Inject Phase A current of0.2 x CT at an angle which is in phase with the polarizing voltage. This angle is outside the tripping region, so trippingshould be blocked. If the function is set to “Control”, check that any output relays programmed for this condition areoperated. If the function is set to “Alarm”, check that the Alarm and Message LEDs are flashing, the correct PhaseDirectional Reverse alarm message is displayed, and any output relays programmed for this condition are operated.2. Slowly increase the angle of the Phase A current in the lagging direction. The directional element should detect currentflow in the tripping direction when the Phase A current is lagging the polarizing voltage by more than 90° ±2°. Thealarm and output relays should reset.3. Continue to increase the lagging angle until the alarm is again raised. The Phase A current should be lagging thepolarizing voltage by an angle of 270° ±2°.4. Continue to increase the angle until the Phase A current is once again in phase with the polarizing voltage. The alarmshould remain.5. Repeat the above Steps 1 through 4 for current angle adjusted in each of Phases B and C.8.4.3 NEUTRAL OVERCURRENTa) NEUTRAL TOC 1The procedure to test this element is identical to that outlined in Phase TOC 1 on page 8–16, except that current is injectedinto any one phase, and the element is not subject to the “phases required for operation” and “voltage restrained time over-current” tests.The blocking from logic inputs check is different from that for Phase TOC 1 and is performed as follows:1. Inject current to cause a pickup.2. Assert logic input to provide a "Block Neutral Time 1". The Pickup LED should immediately turn off.3. Repeat Steps 1 and 2 for logic inputs "Block Neutral O/C", "Block All O/C" and “Block 1 Trip Relay” as required.b) NEUTRAL TOC 2The procedure to test this element is identical to that outlined in Phase TOC 1 on page 8–16, except that current is injectedinto any one phase, and the element is not subject to the “phases required for operation” and “voltage restrained time over-current” checks.The blocking from logic inputs check is different from that for Phase TOC 1 and is performed as follows:1. Inject current to cause a pickup.2. Assert logic input to provide a "Block Neutral Time 2". The Pickup LED should immediately go out.