Voltage - GE 750 Instruction Manual

750/760
Feeder Management Relay
7–30
3. Continue to lower V
ab
minus 2% of VT.

VOLTAGE

4. Raise V until the Pickup LED comes on, and continue to increase until the
ab
indicator goes out. This is the reset voltage, which should be the pickup value
plus 2% of VT.
5. Repeat Steps 1 through 4 except adjust V
The following procedure tests Pickup with Two or Three Phases For Operation:
1. Inject V = nominal voltage and V
ab
and the pickup voltage into the bus voltage input of the relay. The
VOLTAGE
Pickup LED should be on.
2. Slowly raise V until the Pickup LED goes out. This reset voltage should be the
cb
pickup value plus 2% of VT.
3. Reduce V until the Pickup LED comes on. This is the pickup voltage of V
cb
4. Continue to lower V until the Pickup LED goes out. This is the
cb
of V minus 2% of VT.
VOLTAGE
cb
5. Slowly raise V until the Pickup LED comes on. This is the
cb
level.
VOLTAGE
6. Reduce V until the Pickup LED goes out. This is the
ab
V minus 2% of VT.
ab
7. Slowly raise V until the Pickup LED first comes on and then goes out. This is
ab
the reset voltage, which should be the pickup value plus 2% of VT.
8. Lower V until the Pickup LED comes on. This is the pickup voltage of V
ab
c) Bus Undervoltage (Wye and Delta VTs)
To test Bus Undervoltage for Wye and Delta VTs, use the test connections specified
in FIGURE 7–1: Relay Test Wiring – Wye Connection or FIGURE 7–2: Relay Test
Wiring – Delta Connection on page 7–4.
The procedures for testing Indications and Operations are the same as those
outlined for Phase TOC 1 on page 7–18.
The following procedure tests Blocking From Logic Inputs:
1. Inject voltage into the required number of phases to cause a pickup.
2. Assert a logic input to provide a "Block Undervolt 1(2)". The Pickup LED should
immediately go out.
3. Repeat Steps 1 and 2 for logic input "Block 1 Trip Relay" as required.
The following procedure tests the Bus Undervoltage element timing:
1. Connect the "Stop Trigger."
2. Set the voltage source to nominal voltage.
3. Reset the timer. Turn the voltage off in the required number of phases, and
measure the operating time.
4. Repeat Steps 2 and 3 four more times and obtain an average of the time
intervals.
5. Reset the relay and disconnect the "Stop Trigger."
d) Line Undervoltage
The following procedure tests the Line Undervoltage pickup:
1. Inject nominal voltage into the line voltage input of the relay. The Pickup LED
should be off.
2. Slowly lower the voltage until the Pickup LED comes on. This is the pickup
voltage.
3. Continue to lower the voltage until the Pickup LED goes out. This is the
minus 2% of VT.
OPERATING VOLTAGE
http://www.GEmultilin.com
until the Pickup LED goes out. This is the
.
bc
= a voltage between the
cb
Protection Schemes
MIN OPERATING
MIN OPERATING
.
cb
MIN OPERATING
MIN OPERATING
of
MIN OPERATING VOLTAGE
.
ab
MIN
GE Multilin