10.10
SEL-787 Relay Instruction Manual Date Code 20081022
Testing and Troubleshooting
Commissioning Tests
Figure 10.7 Delta Voltage Source Connections
Step 3. Using the front-panel SET/SHOW or the serial port SHOW
command, record the CTRn (where n = VIWDG setting), PTR,
and PHROT setting values.
Step 4. Apply the current and voltage quantities shown in Column 1 of
Table 10.6.
Values are given for PHROT := ABC and PHROT := ACB.
Step 5. Use the front-panel
METER or the serial port MET command to
verify the results.
SEL-787
E01
E02
E03
E04
Voltage
Test
Source
VA
VB
VC
VN
Table 10.6 Power Quantity Accuracy—Delta Voltages
a
Applied Currents and Voltages
Real Power
(kW)
Reactive Power
(kVAR)
Power Factor
(pf)
PHROT := ABC
IAWn =2.5 ∠–26
IBWn =2.5 ∠–146
ICWn =2.5 ∠+94
Expected:
P = 0.4677 • CTRn • PTR
Expected:
Q = 0.2286 • CTRn • PTR
Expected
pf = 0.90 lag
VAB = 120 ∠+30
VBC = 120 ∠–90
Measured: Measured: Measured:
PHROT := ACB
IAWn =2.5 ∠−26
IBWn =2.5 ∠+94
ICWn =2.5 ∠−146
Expected:
P = 0.4677 • CTRn • PTR
Expected:
Q = 0.2286 • CTRn • PTR
Expected:
pf = 0.90 lag
VAB = 120 ∠−30
VBC = 120 ∠+90
Measured: Measured: Measured:
a
n = VIWDG setting
To Next Page
Loading...
