Schweitzer Engineering Laboratories SEL-751 - Figure 11.2 Three-Phase Wye AC Connections; Figure 11.3 Three-Phase Open-Delta AC Connections

11.5
Date Code 20170927 Instruction Manual SEL-751 Relay
Testing and Troubleshooting
Commissioning Tests
Figure 11.2 Three-Phase Wye AC Connections
Figure 11.3 Three-Phase Open-Delta AC Connections
Step 12. Apply rated current (1 A or 5 A).
Step 13. If the relay is equipped with voltage inputs, apply rated voltage
for your application.
Step 14. Use the front-panel
METER > Fundamental function or serial
port METER command to verify that the relay is measuring
the magnitude and phase angle of both voltage and current
correctly, taking into account the relay PTR and CTR settings
and the fact that the quantities are displayed in primary units.
+120˚
–120˚
V
C
V
B
V
C
V
A
PHROT := ABC
+120˚
–120˚
PHROT := ACB
V
B
V
A
When setting PHROT := ABC, set angle V
A
= angle I
A
= 0˚
set angle V
B
= angle I
B
= —120˚
set angle V
C
= angle I
C
= 120˚
When setting PHROT := ACB, set angle V
A
= angle I
A
= 0˚
set angle V
B
= angle I
B
= 120˚
set angle V
C
= angle I
C
= —120˚
60˚
V
AB
V
CB
PHROT := ABC
60˚
V
AB
V
CB
PHROT := ACB
When setting PHROT := ABC, set angle I
A
= 0˚
set angle I
B
= —120˚
set angle I
C
= 120˚
set angle V
AB
= +30˚
set angle V
CB
= +90˚
When setting PHROT := ACB, set angle I
A
= 0˚
set angle I
B
= 120˚
set angle I
C
= —120˚
set angle V
AB
= —30˚
set angle V
CB
= —90˚