The frequency response analysis of transformer has
been expected to be a good method for diagnosing the
transformer condition. As the transformer impedance is affected
by the configuration, the change of the impedance will be a good
indicator for the change of the transformer configuration. The
method which has been recognized cannot achieve the
measurement of current flowing through the stray capacitance to
the earth. The measured impedance was not correct at the high
frequency range where an influence of the capacitance becomes
large. In this paper, the new method was proposed in which the
resistor for the current measurement is connected to the terminal
of the power application and its value is adjusted. It is shown that
the correct measurement can be achieved by the proposed one
document.