Step 3; Pqf Connection Diagram - ABB PQFA Instruction Manual

9.3.

Step 3

Step 3:
Improper CT connection is the most frequent cause of problems during
commissioning.
The following procedure will allow you to check the CT connection.
Warning: The secondary circuit of a loaded CT must never be opened
otherwise extremely high voltages may appear which can
lead to physical danger or destruction of the CT itself.

9.3.1. PQF connection diagram

Figure 9.1. shows the normal connection of the PQF. It must be noted that:
? ? L1, L2 and L3 rotation must be clockwise,
? ? The CTs must be on the supply (line) side of the PQF,
? ? One secondary terminal of the CT must be earthed.
L1
L2
Supply side
L3
Current transformer check
K L
K L
k l
k l
Figure 9.1. PQF connection
Asea Brown Boveri Jumet S.A.
PQFA Instructions Manual
K L
k l
L1 L2
X5.6
X5.5
X5.4
PQF
X5.3
X5.2
X5.1
Load side
L3
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