Omicron CP TD1 - Page 73

73
Power Transformers
A three-winding transformer is much more complicated so more tests are
necessary to measure all gaps. In Figure 6-2, a complete 3-winding power
transformer is shown. The tertiary winding is not accessible in this case. When
the load is unbalanced, it is necessary for flux compensation in the three limbs
of the core.
Figure 6-2 Three-winding transformer with winding to winding and winding
to ground capacitors
N (L) B (L)A (L) C (L)
A (H) B (H) C (H) N (H)
Bushing (A) Bushing (C)Bushing (B)
C H(A) C H(C)C H(B)
C H-L (A)
C H-L(C)C H-L (B)
C H-T
(A)
C H-T
(B)
C H-T
(C)
C L-T(A)C L-T(A)
C L-T
(B)
C L-T
(C)
C L(C)
C L(B)
C L(A)
C T(C)
C T(B)
C L(A)
A B C
H
L
T