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Summary of Contents for Megger LTC135
- Page 1 LTC135 Load Tap Changer testing power supply User’s Manual Art No. ZP-CG11E Doc. CG2009CE V03a 2019...
- Page 3 © 2017-2019, 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
Contents Service and support ..........5 5 Specifications ..............26 Contact Information ............ 5 Checklist before calling/e-mailing for support ....5 Specifications LTC135 ........26 Shipping ..............5 1 Safety ..............6 1.1 General ............6 Symbols on the instrument .......... 6 1.2 Safety instructions ........6 2 Introduction .............. -
Page 5: Service And Support
Identify the instrument model, serial number and revision of software. Shipping If you are going to send the instrument with parcel service use the original transport box or one with equivalent strength. Megger can not take responsibil- ity for transport damages. CG2009CE ZP-CG11E LTC135... -
Page 6: Safety
Protective Conductor Terminal and to the The unit can also be returned to connection point at the ground system. Megger at any time at no charge for Note: The protective ground wire must not be the disposal. loosened while any input connector is attached... - Page 7 Cleaning. Use a damp cloth for cleaning. Do not use liquid cleaners or aerosol cleaners. Important Never leave the LTC135 unattended while it is turned on. Refer all servicing to Megger authorized per- sonnel. CG2009CE...
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Page 8: Introduction
Introduction 2.1 General 2.2 Transformers tap changers This manual is valid for the LTC135 and it is designed for use together with the Megger instruments; Many transformers used today have built-in taps. TM1800, TM1700-series, TM1600 and EGIL. These taps allow ratio to be increased or decreased by LTC135 is a power supply designed for DC current a few percent. -
Page 9: Tap Changer Testing
Dynamic current measurement (”ripple”) ▪ Dynamic voltage measurement ▪ Dynamic resistance measurement (DRM) LTC135 can be used for continuity verification (any dynamic method works), dynamic current, dynamic voltage measurements (timing) and dynamic resist- ance measurements (timing and resistance). CG2009CE ZP-CG11E... -
Page 10: The Instrument
(1 V) A,B and C suited for 3-phase operation CURRENT OUPUT one current output (2 A / 5 A) and a group of three similar outputs (1 A / 0.1 A) A,B and C suited for 3-phase operation LTC135 ZP-CG11E CG2009CE... - Page 11 4 oPERATIoN CG2009CE ZP-CG11E LTC135...
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Page 12: Operation
Connect VOLTAGE OUT on LTC135 to CBA Voltage sensing channel (TM1760 Tim- ing M/R). Connect SHUNT OUT on LTC135 to CBA Cur- rent sensing channel (TM1760 Analog). Connect CURRENT OUTPUT/VOLTAGE IN to transformer winding where LTC is to be tested e.g. A-N. -
Page 13: Running The Test
Since the short has very little resistance, the circulating current through the transformer and the short may continue for a very long period of time. The LTC135 discharge circuitry is built-in and will automatically initiate when the current source is disconnected from the transformer. -
Page 14: Dynamic Resistance Measurements (Drm)
0.1 A test current and this range provides the least influence of the remaining inductance and accurate resistance readings can be achieved. In situations when higher current is neces- DRM example with LV shorted, measurement current 0.1 A LTC135 ZP-CG11E CG2009CE... -
Page 15: Dynamic Voltage Measurements
(LV if LTC on HV) of the trans- former, recording the inductive/induced voltage. Main advantage with this method is its simplicity. only connect a voltage measurement input to one or three windings, inject current and record LV voltage during the tap transition CG2009CE ZP-CG11E LTC135... -
Page 16: Dynamic Current Measurements
The intention is EGIL with analog measurement channel can be used to give a value that describes the conditions during in stand-alone mode with LTC135 to perform single- operation and provide contact timing. phase dynamic voltage measurement. one tap transi- tion can be measured at a time. -
Page 17: With External Computer And Caba
EGIL with analog measurement channel together with Select test current, typically 1 or 5 A for LTC135 can be controlled via CABA Win to perform single phase testing, 3 x 1A for three phase single-phase dynamic voltage measurement. one tap testing transition can be measured at a time. -
Page 18: Using With Tm1600/Ma61
Close coil operates tap changes upwards, while trip coil tap changes downwards. TM1700/1800 Select test current, 1 or 5 A. Connect LTC135 current output to the trans- Stand-alone mode former winding to be measured Dynamic voltage measurements Connect TM1600 analog channel A to volt- age measurement output on LTC135. -
Page 19: Using With Tm1700/1800
Select test current, 1 or 5 A. Connect TM1700/1800 to computer with CABA Win and establish connection. Connect LTC135 current output to the trans- former winding to be measured. In CABA Win select test plan for dynamic voltage measurement on OLTC with Connect TM1700/1800 Timing M/R module TM1700/1800 (“OLTC TM1800 DYNVOL”). - Page 20 Interface select required current transducer. Turn knob Operate/Measure on TM1700/1800 to make a measurement. Close Results window and proceed with next tap. When finished, turn off test current. Note Wait until discharge is finished before remov- ing any cables. LTC135 ZP-CG11E CG2009CE...
- Page 21 5 MEASUREMENT CoNNECTIoNS CG2009CE ZP-CG11E LTC135...
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Page 22: Measurement Connections
For HV delta configurations, the test current is Connection diagram for dynamic resistance measurements 2/3 of measured current from LTC135. Assign on a single-phase transformer. Test current is the same as a 3/2 current transducer in the CBA to get measured current from LTC135. - Page 23 H3-H0 X0-X3 yNy0 H1-H0 X1-(X2+X3) H2-H0 X2-(X3+X1) H3-H0 X3-(X1+X2) yNy6 H1-H0 (X2+X3)-X1 H2-H0 (X3+X1)-X2 H3-H0 (X1+X2)-X3 yNd1 H1-H0 X1-X2 H2-H0 X2-X3 H3-H0 X3-X1 yNd5 H1-H0 X3-X1 H2-H0 X1-X2 H3-H0 X2-X3 yNd7 H1-H0 X2-X1 H2-H0 X3-X2 H3-H0 X1-X3 CG2009CE ZP-CG11E LTC135...
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Page 24: Three-Phase Measurements
Dynamic resistance measurements Connection diagram for single-phase dynamic resistance measurements on a three-phase YNy or YNd transformer. Test current is the same as the three measured currents from LTC135. Note 3-phase dynamic resistance measurements are not recommended to perform on HV delta configurations. - Page 25 5 SPECIFICATIoNS CG2009CE ZP-CG11E LTC135...
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Page 26: Specifications
5 SPECIFICATIoNS Specifications Specifications LTC135 Specifications are valid at fully charged batteries and an ambient temperature of +25°C, (77°F). Specifications are subject to change without notice. Environment Application field For use in high-voltage substations and industrial environments. Temperature Operation -20ºC to +45°C (-4°F to +113°F) *) Storage -40ºC to +70ºC (-40°F to +158°F) - Page 27 5 SPECIFICATIoNS CG2009CE ZP-CG11E LTC135...
- Page 28 ▪ 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 Megger Group Limited ▪...
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