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Safety is the responsibility of the user

Only qualified and trained personnel should operate the MWA300. Operator must read and understand this entire instruction manual prior 
to operating the equipment. Operator must follow instruction manual and attend to the equipment while in use. In the event of equipment 
malfunction, the unit should immediately be de-energized and returned 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 operation)

Before

Black to Low

Voltage Secondary

or Tertiary Winding

HIGH-VOLTAGE EQUIPMENT!

MWA300 Quick Start Guide

MWA300_QG_EN_V01

1

 

Red to High 
Voltage
Primary Winding

Summary of Contents for MWA300 Series

Page 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...

Page 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 ...

Page 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 ...

Page 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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