Schweitzer Engineering Laboratories SEL-587Z - Figure 10.5 Test Connections for Balanced Load with Three-Phase Current Sources; Figure 10.6 Test Connections with Two-Phase Current Sources

10.9
Date Code 20020903 SEL-587Z Instruction Manual
Testing and Troubleshooting
Acceptance Testing
Step 3. Purpose: Verify phase rotation.
Method: Verify that residual (IG) and negative-sequence (3I2)
quantities are approximately zero (or much less than the
approximately 120 A primary displayed for the phases). If IG
equals approximately three times the applied current, then all
three phases have the same angle. If 3I2 equals approximately
three times the applied current then the phase rotation is
reversed. Turn the current sources off.
Figure 10.5 Test Connections for
Balanced Load With Three-Phase Current Sources.
Figure 10.6 Test Connections With Two-Phase Current Sources.
1
07
IA
IB
I
C
S
EL-
58
7
Z
(
p
artial
)
Cu
rr
e
n
t
Sou
r
ce
1
Cu
rr
e
n
t
Sou
r
ce
3
Cu
rr
e
n
t
Sou
r
ce
2
10
8
11
0
1
09
111
11
2
1
0
7
IA
IB
I
C
S
EL-
58
7
Z
(
p
artial
)
Cu
rr
e
n
t
Sou
r
ce
1
Cu
rr
e
n
t
Sou
r
ce
2
1
08
11
0
1
09
111
112