ABB PQFA, Instruction Manual

Page: 55 / 98

PQFA Instructions Manual
Asea Brown Boveri Jumet S.A.
55
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The same operations as those described in the previous paragraph must be
repeated with the phase L2 (Figure 9.5) and phase L3 (Figure 9.6).
For a balanced load (which is usually the case in most of the three phase
systems), the phase shift should be approximately the same for all the three
phases.
L1
L2
L3
Load side Supply side
K L
k l
K L
k l
K L
k l
PQF
X5.2
X5.3
X5.4
X5.5
X5.6
X5.1
L1 L2 L3
Positive direction
Ch1 Ch2
Figure 9.5. Connection of the scopemeter for checking CT in phase L2.
L1
L2
L3
Load side Supply side
K L
k l
K L
k l
K L
k l
PQF
X5.2
X5.3
X5.4
X5.5
X5.6
X5.1
L1 L2 L3
Positive direction
Ch1 Ch2
Figure 9.6. Connection of the scopemeter for checking CT in phase L3.