8.1.2 Capacitive Current
The insulation between conductors which have a potential difference between
them behaves as the dielectric of a capacitor, the conductors acting as
the capacitor plates. When a direct voltage is applied to the conductors, a
charging current will flow to the system which will die away to zero (usually
in less than a second) when the effective capacitor becomes charged. This
charge must be removed from the system at the end of the test, a function
which is automatically performed by the KT64. If an alternating voltage
is applied between the conductors, the system continuously charges and
discharges as the applied voltage alternates, so that there is a continuous
alternating leakage current flowing to the system.
8.1.3 Conduction Current
Since the insulation resistance is not infinite, a small leakage current flows
through the insulation between conductors. Since Ohm's Law applies, the
leakage current can be calculated from
applied voltage (V)
Leakage current (μA) ＝
insulation resistance (MΩ)
Fig. 12
Fig. 13
Insulation
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