MI 3299 HV DEMO BOX 10 kV
Introduction
6
General applicable values for dielectric discharge are shown in
Table 3
.
DD value
Tested material status
> 4
Bad
2 - 4
critical
< 2
good
Table 3: Typical values
for dielectric discharge
1.1.3 Breakdown measurements
This part of demo box consists of a spark gap and a gas discharge tube. The spark gap
allowed that user should test robustness of the HV insulation testers against sparkling.
The spark-over voltage is approximately 4 kV.
The gas discharge tube simulates breakdown effect in the insulation. Breakdown
voltage is 1200 V, the arc voltage is approximately 120 V.
Note:
● To increase the effect of sparkling, you can connect the spark gap or the gas
discharge tube parallel with capacitor 5 nF.
1.1.4 Capacitance measurements
This segment includes two capacitors (5nF and 2,5 µF). Maximum allowed DC voltage
on the 5 nF
capacitor is 10 kV. Maximum allowed DC voltage on the 2,5 µF capacitor is
1000 V, this capacitor has internal overvoltage protection.
Both capacitors allowed parallel connection to the other segments. This is very useful, if
the user wants to find out the influence of the capacitance on the accuracy of the
resistance measurement.
