C H A P T E R 7 – T E S T S A N D T E S T C O N D I T I O N S
AT5600 User Manual 98-119 issue 14 Page 109
7.12. C - Interwinding Capacitance
Where Used
Capacitance occurs in transformers due to the physical proximity of, and
electrostatic coupling between, different turns of wire. In general, the capacitance
is distributed between the different layers within a winding, and between the
outside layer of one winding and the inside layer of the next.
Although the capacitance is distributed, it is usually represented by a simple
equivalent circuit showing a single capacitance from one winding to the next.
Inter-winding capacitance may be of interest in transformers used in audio,
medical and instrumentation applications, where isolation between primary and
secondary windings is important. It can also play an important part in the circuit
operation of switch-mode transformers where, for example, too large a
capacitance may give rise to a large amount of noise at the switching frequency
being coupled into sensitive circuits connected to the secondary windings.
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