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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For most machines with random -wound stator coils and form-wound coils rated below 1kV.

If desired, the installation can be tested as a whole, when a value of at least 0. Resistance measurements are then made between each winding and all other windings grounded. All I.r.tfsting surge diverter earth connections are to be disconnected during the test.

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. Fluke insulation resistance i.r.tedting up to 10kV I.testing from first part: Virendra Nathe Tiwari Jun 12, Usha Aug 31, IR Value for Transformer Ref: Insulation resistance tests are made to determine insulation resistance from individual windings to ground or between individual windings.


I think is tertiary winding. I need to know the HV and Megger test voltage value and routine tests to be performed for medium voltage 6.

Aniruddha Bhattacharjee Nov 04, Dear Sir Thanks for all this good work that you have done. If this happens, the i.r.gesting should be subdivided and retested, when each part must meet the minimum requirement. Electrical engineering practitioners should always read and understand the appropriate guidance, incorrect information is misleading.

Measurement of insulation resistance IR — 2. 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. Leave a Comment Click here to i.r.testnig reply. The resistance between Phase-Phase-Neutral-Earth must never be less than 0.

Vincenzo Dec 30, Facebook Linkedin Google Plus Twitter.

Measurement of insulation resistance (IR) – Part 2

For any installation, the insulation resistance measured shall not be less than: Motor Name I.r.testijg V. The result must conform with that specified in the British Standard concerned, or be at least 0. Krishnaiah Oct 24, Discharge the winding capacitance. Sir,one 40MVA Transformer which was in service for 3 years. What voltage do u use 5 test a v bus bar and what are the expected results.


Capacitors and indicator or pilot lamps must be disconnected or an inaccurate test reading will result. Continued from first part: Arabinda Feb 08, He is Presently associate with one of the leading business group as a Deputy Manager at Ahmedabad,India.

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

The recommended practice in measuring insulation resistance is to always ground i.r.testting tank and the core. Guard the terminals to eliminate surface leakage over terminal bushings. Vilas Pathak Mar 18, For the 22 KV cable 3 cores x sq.