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MI 3201 TeraOhm 5 kV Plus Measurements

5.8 Withstanding voltage

This function offers Withstanding Voltage test of insulation material. It covers two types

of tests:

a) Breakdown voltage testing of high voltage device, e.g. transient suppressors

b) DC withstanding voltage test for insulation coordination purposes.

Both functions require breakdown current detection. In the function, the test voltage is

increased from the starting voltage to the stop voltage over a predefined time (set by the

parameters). The Stop voltage is then maintained for a predefined test time, (see the

Fig. 28).

Ut Ut

Ustop

Ustart Ustart

step

end

Fig. 28. Test voltage presentation without breakdown (left part) and with breakdown

(right part)

Ut........ Test voltage

Ustop .. End test voltage

Ustep .. Voltage step approx. 25 V (fixed value - not presetable)

Ustart.. Starting voltage

Tstep... Test voltage duration per step

Tend ... Constant test voltage duration after reaching End value

t........... Time

Ub....... Breakdown voltage

Selecting this function displays the following states. Fig. 29 shows the initial screen and

a screen with results after the completion of a measurement

Initial display

Display with results

Fig. 29. Withstanding Voltage function display states

METREL TeraOhm 5kV Plus User Manual

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