Specifications
Inter-winding capacitance (C) between the primary and the secondary is measured by connecting one
side of each winding to the instrument as shown in Figure 5-17.
Mutual inductance (M) Obtain mutual inductance (M) by measuring the inductance in the series aid-
ing and the series opposing configurations and then calculating the results using the equation given
in Figure 5-18 (a). Mutual inductance can be measured directly if the transformer is connected as
shown in Figure 5-18 (b). However, the applicable frequency range of this direct connection tech-
nique is limited by the type and the parameter values of transformer being measured. This method
premises that stray capacitance effect including the distributed capacitance of windings and test
lead capacitance is sufficiently small. We recommend using both techniques and cross checking the
results.
Figure 5-17. Inter-winding capacitance measurement
Figure 5-18. Mutual inductance measurement
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