Current Transformers Installation; Ct' S Connection To The Pqfa - ABB PQFA Instruction Manual

PQFA Instructions Manual
6.4.

Current transformers installation

Special care has to be taken for the connection and location of the CT' s: it is
the most current source of problems occurring at commissioning stage.
WARNING: when connecting the CT' s to the PQFA, the secondaries of
the CT' s have to be short-circuited.
First of all, the CT' s have to be positioned for closed loop control: they have to
monitor the resulting current after filtering.
The CT' s must also be positioned in the correct direction around the power
cable: the K (or P1) side should be in the direction of the supply and the L (or
P2) side should be in the direction of the load.

6.4.1. CT' s connection to the PQFA

The connections between the CT' s and the filter must satisfy the following
scheme:
? ? The k terminal of line 1 CT is connected to terminal X5-1 of the filter
? ? The l terminal of line 1 CT is connected to terminal X5-2 of the filter
? ? The k terminal of line 2 CT is connected to terminal X5-3 of the filter
? ? The l terminal of line 2 CT is connected to terminal X5-4 of the filter
? ? The k terminal of line 3 CT is connected to terminal X5-5 of the filter
? ? The l terminal of line 3 CT is connected to terminal X5-6 of the filter
Asea Brown Boveri Jumet S.A.
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