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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Can any one explain the Reason??? Fluke insulation resistance tester up to 10kV Continued from first part: For most windings i.r.yesting before aboutall field windings, and others not described below.

Value for LT to Earth is coming only 43M-ohm, any one can give me solution.

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

IR Value for Tap Changer 4. For electric motorwe used a insulation tester to measure the resistance of motor winding with earthing E. Due to the inductive characteristics of transformers, the insulation resistance reading shall not be taken until the test current stabilizes. Subhajit Shee Sep 17, In the case of a very large installation where there are many earth paths in parallel, the reading would be expected to be lower. Connect the test leads avoid joints. IR Value for Electrical cable and wiring 6.


Vincenzo Dec 30, Value below which Insulation is not acceptable etc. Ronal Manuel Nov 09, The content is copyrighted to EEP and may not be reproduced on other websites. Krishnaiah Oct 24, Thanks for your article.

Where any equipment i.r.tesging disconnected for testing purposes, it must be subjected to its own insulation test, using a voltage which is not likely to result in damage. I think is tertiary winding.

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

Electrical engineering practitioners i.r.tesing always read and understand the appropriate guidance, incorrect information is misleading. Insulation resistance tests are commonly measured directly in megohms or may be calculated from measurements of applied voltage and leakage current. Treat it as part of the grounded section of the circuit. Arabinda Feb 08, Thoroughly clean all bushings Short circuit the windings.

Measurement of insulation resistance (IR) – Part 2

What voltage do u use 5 test a v bus bar and what are the expected results. Qaisar Feb 02, Facebook Linkedin Google Plus Twitter. Thank you for this very useful article. Tech Power System Control ,B. If this happens, the installation should i.r.tesfing subdivided and retested, when each part must meet the minimum requirement.


Guard the terminals to eliminate surface leakage over terminal bushings.

Sir, it has been observed that during i.rtesting replacement procedure of a power transformer in one of our Substations IR values were taken after draining of oil and after filling with oil. Insulation resistance tests i.r.hesting made to determine insulation resistance from individual windings to ground or between individual windings.

It was found that the reading was less with oil than without oil. Electronic equipment like electronic fluorescent starter switches, touch switches, dimmer switches, power controllers, delay timers could be damaged by the application of the high test voltage should be disconnected.

Abdulhameed Jul 01, Megger Value of HV 6. Usha Aug 31, Sami Rashed Dec 29, IR Value for Panel Bus 8. Measurement of insulation resistance IR — 2. This cause deterioration of the insulation, as well as involving a waste of energy which would increase the running costs of the installation.

Motor Name Plate V.