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PD Calibrator A195001 User's Manual
As to the equivalent capacitance Ca of DUT, the CO should be much smaller than Ca (CO
<0.1 * Ca), otherwise the calibration factor must be considered. However, Ck >> Ca (Ck
usually>1nF) in common situation, so CO and Ca will not affect the measurement result.
The connection method of basic partial discharge detection, measurement circuit and
calibrator is shown in the figure below. The PD pulse current generated by the calibrator
flows through the coupling device C
detection loop. The measurement impedance connects the detection signal to the
measurement instrument through the coupling device CD to perform the PD measurement.
The coupling capacitor and the measuring impedance are connected in series and
grounded; therefore, the DUT is directly connected between the high-voltage output and
the ground terminal.
The DUT is connected to the measured impedance in series and then grounded;
therefore, good insulation is required between the DUT low-voltage end and the ground
terminal.
Components:
U- high-voltage supply
Z
filter
C
test object
a
C
coupling capacitor
K
CD coupling device
Z
input impedance of measuring system
mi
CC connecting cable
MI measuring instrument
3-2
and the measurement impedance Z
K
to form a
mi
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