Schweitzer Engineering Laboratories SEL-751 - Table 11.5 Power Quantity Accuracy-Wye Voltages; Figure 11.6 Delta Voltage Source Connections

11.9
Date Code 20170927 Instruction Manual SEL-751 Relay
Testing and Troubleshooting
Commissioning Tests
Step 3. Using the front-panel SET/SHOW or the serial port SHOW
command, record the CTR, PTR, and PHROT setting values.
Step 4. Apply the current and voltage quantities shown in Column 1 of
Table 11.5.
Values are given for PHROT := ABC and PHROT := ACB.
Step 5. Use the front-panel
METER function or the serial port MET
command to verify the results.
Delta-Connected Voltages
Perform the following steps to test delta-connected voltages:
Step 1. Connect the current source to the relay, as shown in
Figure 11.4.
Step 2. Connect the voltage source to the relay, as shown in
Figure 11.6. Make sure that DELTA_Y := DELTA.
Figure 11.6 Delta Voltage Source Connections
Step 3. Using the front-panel SET/SHOW or the serial port SHOW
command, record the CTR, PTR, and PHROT setting values.
Step 4. Apply the current and voltage quantities shown in Column 1 of
Table 11.6.
Values are given for PHROT := ABC and PHROT := ACB.
Table 11.5 Power Quantity Accuracy—Wye Voltages
Apply Currents and Voltages
Real Power
(kW)
Reactive Power (kVAR)
Power Factor
(pf)
PHROT := ABC
Ia = 2.5 
Ib = 2.5 146
Ic = 2.5 +94
Expected:
P = 0.4523 • CTR • PTR
Expected:
Q = 0.2211 • CTR • PTR
Expected:
pf = 0.90 lag
Va = 67 0
Vb = 67 120
Vc = 67 +120
Measured: Measured: Measured:
PHROT := ACB
Ia = 2.5 26
Ib = 2.5 +94
Ic = 2.5 146
Expected:
P = 0.4523 • CTR • PTR
Expected:
Q = 0.2211 • CTR • PTR
Expected:
pf = 0.90 lag
Va = 67 0
Vb = 67 120
Vc = 67 120
Measured: Measured: Measured:
SEL-751
Z09
Z10
Z11
Z12
Voltage
Test
Source
VA
VB
VC
N
Va
Vb
Vc
N