Schweitzer Engineering Laboratories SEL-787 - Figure 10.5 CTR2 Current Source Connections; Table 10.3 CTR1 Phase Current Measuring Accuracy; Table 10.4 CTR2 Phase Current Measuring Accuracy

10.8
SEL-787 Relay Instruction Manual Date Code 20081022
Testing and Troubleshooting
Commissioning Tests
Step 5. Repeat Step 1 through Step 4 using Figure 10.5 and Table 10.4.
Figure 10.5 CTR2 Current Source Connections
Power and Power Factor Measuring Accuracy
Wye-Connected Voltages
Perform the following steps to test wye-connected voltages:
Step 1. Connect the current source to the relay, as shown in Figure 10.4
(VIWDG = 1) or Figure 10.5 (VIWDG = 2).
Step 2. Connect the voltage source to the relay, as shown in
Figure 10.6. Make sure that DELTA_Y := WYE.
Table 10.3 CTR1 Phase Current Measuring Accuracy
|I| Applied
(A secondary)
a
a
I
NOM
= rated secondary amps (1 or 5).
Expected
Reading
CTR1 x |I|
A–Phase
Reading
(A primary)
B–Phase
Reading
(A primary)
C–Phase
Reading
(A primary)
0.2 x I
NOM
0.9 x I
NOM
1.6 x I
NOM
Table 10.4 CTR2 Phase Current Measuring Accuracy
|I| Applied
(A secondary)
a
a
I
NOM
= rated secondary amps (1 or 5).
Expected
Reading
CTR2 x |I|
A–Phase
Reading
(A primary)
B–Phase
Reading
(A primary)
C–Phase
Reading
(A primary)
0.2 x I
NOM
0.9 x I
NOM
1.6 x I
NOM
SEL-787
Current
Test
Source
IA
IB
IC
IC
IB
IA
IN
Z07
Z08
Z09
Z010
Z011
Z012