Schweitzer Engineering Laboratories SEL-787, Instruction Manual

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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 CTR n (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
IAW n = 2.5
∠
–26
IBW n = 2.5
∠
–146
ICW n = 2.5
∠
+94
Expected:
P = 0.4677 • CTR n • PTR
Expected:
Q = 0.2286 • CTR n • PTR
Expected
pf = 0.90 lag
VAB = 120
∠
+30
VBC = 120
∠
–90
Measured: Measured: Measured:
PHROT := ACB
IAW n = 2.5
∠−
26
IBW n = 2.5
∠
+94
ICW n = 2.5
∠−
146
Expected:
P = 0.4677 • CTR n • PTR
Expected:
Q = 0.2286 • CTR n • PTR
Expected:
pf = 0.90 lag
VAB = 120
∠−
30
VBC = 120
∠+
90
Measured: Measured: Measured:
a
n = VIWDG setting