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Summary of Contents for Megger MTO106
- Page 1 MTO106 Transformer ohmmeter User’s Manual Art No. ZP-BN01E Doc. BN034794AE V01a 2018...
- Page 3 © 2018, Megger Sweden AB. All rights reserved. The contents of this manual are the property of Megger Sweden AB. No part of this work may be reproduced or transmitted in any form or by any means, except as permitted in written license agreement with Megger Sweden AB. Megger Sweden AB has made every reasonable attempt to ensure the completeness and accuracy of this document.
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Page 4: Table Of Contents
5 Application examples ............14 5.1 Testing transformers with tap changers ..14 5.2 Temperature correction ......14 5.3 Manual demagnetization of a transformer .15 6 Troubleshooting and Calibration ..16 6.1 Troubleshooting .........16 7 Specifications ............18 Specifications ...........18 MTO106 ZP-BN01E BN034794AE... - Page 5 BN034794AE ZP-BN01E MTO106...
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Page 6: Introduction
Introduction 1.1 Product description 1.2 Winding resistance testing The MTO106 transformer ohmmeter is an easy-to-use, line-operated instrument specifically designed for safe Transformer winding resistances are measured in and accurate field measurement of winding resistance the field in order to check for abnormalities due to in smaller transmission and distribution transformers. -
Page 7: Receiving Instructions
Products supplied by Megger are warranted against check the equipment received against the packing list to defects in material and workmanship for a period of ensure that all materials are present. Notify Megger of any one year following shipment. shortage. -
Page 8: Safety
The unit can also be returned to quickly in case of a problem. The instrument Megger at any time at no charge for should be operated only from the type of power the disposal. -
Page 9: Maintenance
Maintenance DISCONNECT the MAINS plug before any cleaning or maintenance. Refer all servicing to Megger authorized personnel. Do not attempt to service the instrument yourself. If you attempt to service the instrument the warranty is no longer valid. -
Page 10: Instrument Description And Accessories
6. 100-240 V ~ 5 A 50 / 60 Hz Mains input and fuse box: Always use the power cord supplied with the unit. The unit is powered when the switch for power input is in the “on” position. MTO106 ZP-BN01E BN034794AE... -
Page 11: The Display
1009-744 urement is stable. MTO106 dual channel measurement lead set GA-19000 Note: In large transformers the MTO106 may be Parts included in the MTO106 dual channel meas- unable to fully saturate the core and the reading urement lead set (GA-19000). -
Page 12: Setup And Operation
Connect the Kelvin-type test leads to the MTO106, see figures below. ▪ The leads marked "Generator" to the "CUR- use the Megger supplied safety ground lead to connect the MTO106 protective conductor terminal directly to RENT OUTPUT" terminals of corresponding local station earth (Ground). -
Page 13: Testing Delta Winding Resistance
The discharge of a transformer after testing is H0-X3 critical to prevent excessive voltage build-up H3-X1 across the transformer bushings upon removal H1-X2 the test leads. The MTO106 discharge circuitry H2-X3 is built-in and will automatically initiate when H0-X2 the current source is disconnected from the YNd7 H0-X3 transformer. -
Page 14: Application Examples
Monitor the resistance value closely before storing the value to make sure the resistance value has stabilized! MTO106 ZP-BN01E BN034794AE... -
Page 15: Manual Demagnetization Of A Transformer
5 APPLIcATION EXAMPLES 5.3 Manual demagnetization of a transformer The MTO106 does not include and automated demagnetization feature and demagnetization, if deemed necessary, must be performed manually according to the method below. Run a normal winding resistance test accord- ing to the instructions in section "4.2 Testing Single and Dual windings"... -
Page 16: Troubleshooting And Calibration
Too high test current Lower test current of set current value “< 0.010 mΩ” Resistance below measurement is displayed range “< 0.10 mΩ” “< 1.0 mΩ” Too low test current Increase test current “< 0.010 Ω” “< 0.10 Ω” MTO106 ZP-BN01E BN034794AE... - Page 17 7 SPEcIFIcATIONS BN034794AE ZP-BN01E MTO106...
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Page 18: Specifications
4 digits 0.010 Ω to 9.999 Ω ±(0.25%rdg + 2 digits) 0.001 Ω 1 mA 100.0 Ω to 30.00 kΩ ±(0.25%rdg + 1 digit) 4 digits 0.10 Ω to 99.99 Ω ±(0.25%rdg + 2 digits) 0.01 Ω MTO106 ZP-BN01E BN034794AE... - Page 20 ▪ Insulation Power Factor (C&DF) Test Equipment worldwide. ▪ Insulation Resistance Test Equipment Megger is certified according to ISO 9001 and 14001. ▪ Line Testing Equipment Megger is a registered trademark. ▪ Low Resistance Ohmmeters ▪...
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