The following table lists the parasitic capacitances which exist in a three winding (two secondary) power transformer,
in a two winding (one secondary) power transformer and in a bushing transformer:
Transformer
Scheme
Terms
Three winding
(two
secondary)
power
transformer
•
H = high voltage terminal
•
L = low voltage terminal
•
T = third winding
•
G = Ground
•
C(H-T): parasitic capacitance between High
voltage and T
•
C(H-L): parasitic capacitance between High
voltage and Low voltage
•
C(H-G): parasitic capacitance between High
voltage and Ground
•
C(L-G): parasitic capacitance between Low
voltage and Ground
•
C(L-T): parasitic capacitance between Low
voltage and T
•
C(T-G): parasitic capacitance between T and
Ground
•
C(H-Tap): parasitic capacitance between
High voltage and Tap
•
C(Tap-G): parasitic capacitance between Tap
and Ground
•
Test tap = test terminal
Two winding
(one
secondary)
power
transformer
Bushing
transformer
Table 76 - Parasitic capacitances
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