ABB PQFA, Instruction Manual

Page: 39 / 98

PQFA Instructions Manual
Asea Brown Boveri Jumet S.A.
39
Figure 6.5. Transformer busbar with no access: CT connection (to be
done for each phase)
The CT’s installed in each phase of side A et B (CT1 and CT2) must be
identical (X / 5) and feed a summation CT whose secondary is 5A (5+5/5A).
The summation CT is then connected to the active filter in accordance with
chapter 6.4.1.
A total of 3 summation CT’s (one per phase) must be used. The CT ratio to be
programmed in the filter is: 2X / 5.
The CT – summator – PQF connection is represented here below. This has
to be done for each phase.
LOADS
(Side A)
LOADS
(Side B)
PQF
Summation CT
(one per phase)
Primary 1: 5 A
Primary 2: 5A
Secondary: 5A
CT 1 (one per
phase)
Primary: X
Secondary: 5A
CT 2 (one per
phase)
Primary: X
Secondary: 5A