All electrical installations and equipment comply with insulation resistance specifications so they can operate safely. Whether it involves the connection cables. IR Testing for Low voltage. Circuit voltage, Test voltage, IR Value(Min). Extra Low Voltage, V DC, MΩ. Up to V except for above. These minimum IR testing voltages must always be adhered to in order to accurately measure the Insulation Resistance in all electrical equipment. Any test .

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IR Value for Transformer Ref: I.r.resting resistance between Phase-Phase-Neutral-Earth must never be less than 0. Due to site constraints the cable could not be disconnected at both ends of the installation, however the circuit breakers were switched off at both ends leaving the neutral and earth connected. Excellent work on single paper.

IR Value at Maintenance Time. Ronal Manuel Nov 09, Medium and Low Voltage Installations- At a pressure of V applied between each live conductor and earth for a period of one minute, the insulation resistance of medium and low voltage installations shall be at least 1 Mega ohm or as specified by the Bureau of Indian Standards] from time to time.

Auto transformer two windings 1. Capacitors and indicator or pilot lamps must be disconnected or an inaccurate test reading will result. I sent your link to one of overhead crane supplier which was located in some part in Europe, because we were requesting for the IR but i.r.testong say they do not know such IR.


The recommended practice in measuring insulation resistance is to always ground the tank and the core.

Vincenzo Dec 30, I wish to thank the author for making this information available to the general public who could be harmed as a consequence. Sir, it has been observed that during oil replacement procedure of a power transformer in one of our Substations IR values were taken after draining of oil and after filling with oil. Arabinda Feb 08, At a pressure of V applied between each live conductor and earth for a period of one minute the insulation resistance of HV installations shall be at least 1 Mega ohm or as specified by the Bureau of Indian Standards.

Tashi Tobgay Sep 16, Ganesh Kumar Aug 17, IR Value for Electric motor 5. A little knowledge is dangerous. Subhajit Shee Sep 17, For most windings made before aboutall field windings, and others not described below. Premium Membership Get access to premium electrical guides, technical articles and much more! Dear Sir Thanks for all this good work that you have done.

Motor Out off Well Without Cable. This current dissipates no energy and is not harmful, but we wish to measure the resistance of the insulation, so DC Voltage is used to prevent reactance from being included in the measurement.

Fluke insulation resistance tester up i.rr.testing 10kV Continued from first part: Avoid meggering when the transformer is under vacuum. Thoroughly clean all bushings Short circuit the windings.

Measurement of insulation resistance (IR) – Part 2

The content is copyrighted to EEP and may i.r.trsting be reproduced on other websites. Value below which Insulation is not acceptable etc. Sir, do you know how to compute the minimum recommended value for busbar? To test the other, both two-way switches should be operated and the system retested. Auto Transformer three winding 1.

  ISO 17665-2 PDF

A meenashankar Jan 07, How to check d IR value of kv polymer insulator??

IR Value for Substation Equipment 9. Definitely there will be a temperature rise of 10 degree Celsius from cold to No-load running.

All LV surge diverter earth connections are to be disconnected during the test.

The example you stated mention some thing in contrary See Below. Steps for measuring the IR of Transformer: IR Value for Tap Changer 4. If desired, the installation can be tested as i.r.testinf whole, when a value of at least 0. Usha Aug 31, Luckily after searching in the web your article showed up.

Insulation resistance tests are made to determine insulation resistance from individual windings to ground or between individual windings.

Benefits of Permanently Installed Automatic Insulation Resistance (IR) Testing: Part 1 of 3

Connect the test leads avoid i.r.tessting. This cause deterioration of the insulation, as well as involving a waste of energy which would increase the running costs of the installation. Aniruddha Bhattacharjee Nov 04, Samer Alamouri Jun 30, Can any one explain the Reason??? Adam Edmont Mbulawa Jun 17, Vilas Pathak Mar 18,