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Turn Instrument On, select MWA from instrument list on
PowerDB which brings up “Select a Form” box.

Select 3Ø Turns Ratio & Winding Resistance form.
This guide uses this form as an example. Allow 30-60
seconds for PC to communicate with Instrument. See
manual for any PC connection issues.

Fill out Nameplate information (minimum info listed below)

Input Desired Test Settings

At this stage, connect Test leads to transformer under test.
Note color coding and marking on leads. Match to transformer 
bushing markings.

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Содержание MWA300 Series

Страница 1: ...eturned to Megger for repair The safety precautions herein are not intended to replace your company s safety procedures Refer to IEEE 510 1983 IEEE Recommended Practices for Safety in High Voltage and High Power Testing for additional information Read the MWA300 manual before operating equipment This guide is not meant to replace manual Connect Leads Power Ground After INT EXT switch set to EXT PC...

Страница 2: ...this form as an example Allow 30 60 seconds for PC to communicate with Instrument See manual for any PC connection issues Fill out Nameplate information minimum info listed below Input Desired Test Settings At this stage connect Test leads to transformer under test Note color coding and marking on leads Match to transformer bushing markings 2 Page 2 3 4 5 6 ...

Страница 3: ...ighlighted box to begin testing individual phase For automated winding resistance testing MTO Test Wizard can be used if all critical nameplate information is filled in from step 4 above Select and start the Ratio TTR Test by depressing below Testing will follow Nameplate input from 4 above 7 8 9 10 Page 3 ...

Страница 4: ... concluded iv Results Graph plots resistance results for diagnostic review This is useful in determining that each past result is following an expected pattern Different OLTC tap changers develop different shaped patterns such as V Saw Tooth Slope curves Familiarity with these tap changers helps improve diagnostic capability v vi Measured Resistance result with color background changes using Readi...

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