Insulation Resistance Test Australian Standard

Testing standard for underground and overhead distribution powerlines up to and including 33kv networks.

Insulation resistance test australian standard.

The megger insulation tester is a small portable instrument that gives you a direct reading of insulation resistance in ohms or megohms. At a pressure of 1000 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. As per ie rules 1956. Technical standards for testing underground and overhead networks ts 105.

Historically many field electricians use the somewhat arbitrary standard of 1 megohm per kv. With a little record keeping and common sense however you can get a good picture of the insulation condition from values that are only relative. 1 as nzs 3017 2001 electrical installations testing and inspection guidelines 4 preface 5 contents 6 section 1 scope and general 6 1 1 scope 6 1 2 safety 7 1 3 referenced documents 8 1 4 sequence of tests 8 1 5 failure of a test 8 1 6 test equipment 8 1 6 1 equipment checks 8 1 6 2 equipment 10 section 2 visual. In reality this voltage surge may be due to lightning or the induction caused by a fault on a.

Based upon equipment rating. Dielectric strength testing also called breakdown testing measures an insulation s ability to withstand a medium duration voltage surge without sparkover occurring. Insulation resistance decreases in temperature or moisture. Standards australia standards new zealand australian new zealand standard electrical installations verification guidelines section 1 scope and general 1 1 scope this standard sets out some of the common inspection and test methods required to verify that a low.

One meg ohm rule for ir value for equipment. The international electrical testing association neta specification maintenance testing specifications for electrical power distribution equipment and.