Insulation Resistance Test Standard Pdf

Historically many field electricians use the somewhat arbitrary standard of 1 megohm per kv.

Insulation resistance test standard pdf.

The megger insulation tester is a small portable instrument that gives you a direct reading of insulation resistance in ohms or megohms. Quickly perform advanced insulation resistance testing. It is commonly used in the industry for acceptance testing prior to energizing the cable and for maintenance testing programs. Insulation resistance testing is a non destructive test procedure.

The international electrical testing association neta specification maintenance testing specifications for electrical power distribution equipment and. Power cables with extruded insulation and their accessories for rated voltages from 1 kv um 1 2 kv up to 30 kv um 36 kv part 1. The document uses the standard numbering system of ansi and ieee. In reality this voltage surge may be due to lightning or the induction caused by a fault on a.

And its reasonable price makes it an excellent value. Time resistance testing method this method is fairly independent of temperature and often. The test measures the insu lation resistance between the phases and or between phase and ground. Dielectric strength testing also called breakdown testing measures an insulation s ability to withstand a medium duration voltage surge without sparkover occurring.

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. Standards ieee std 43 2000 recommended practice for testing insulation resistance of rotating machines and other. Cables for rated voltages of 1 kv um 1 2 kv and 3 kv um 3 6 kv reference number. Portable measurement equipment in a wide variety of fields.

Testing and inspection environmental measurements laboratory instrumentation power and energy. On february 19 2009 the american national standards institute approved the neta acceptance testing. Also acceptable values of insulation resistance depend upon the equipment you re testing. Insulation resistance decreases in temperature or moisture.

See the site fixed equipment for measurement and testing of electrical networks energy management and optimization systems. Since 1989 revised editions of the acceptance testing specifications have been published in 1991 1995 1999 2003 and 2007. Its handy size makes it easy to pack and use.