Cable Insulation Resistance Test Standard Iec

Z 2 electrical insulation testing.

Cable insulation resistance test standard iec. Cables for rated voltages of 1 kv um 1 2 kv and 3 kv um 3 6 kv reference number iec 60502 1 2004 e international standard iec 60502 1 second edition 2004 04. Insulation resistance test data may be used to establish a trending pattern. Insulation resistance testing guide. Maintenance insulation resistance testing can be performed on a regular basis and the collected data used to indicate if the conductor insulation is deteriorating over time.

The resistance is determined by the glow wire test. Historically many field electricians use the somewhat arbitrary standard of 1 megohm per kv. The temperature amounts to. Ieee400 1 2007 ieee guide for field testing of laminated dielectric shielded power cable systems.

If insulation resistance of the cable is found between 1000 and 100 kω km at buried temperature the subject cable should be replaced urgently within a year. 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 equipment under test is brought into contact with the hot filament for 30 seconds. Also acceptable values of insulation resistance depend upon the equipment you re testing.

Table 100 22 minimum radii for power cable. Insulation resistance decreases in temperature or moisture. 11 ieee 400 2012 omnibus ieee guide for field testing and evaluation of the insulation of shielded power cable systems rated 5 kv and above. 960 15 c for parts containing live components 850 15 c for cavity wall parts 650 15 c for all others.

This type of test is a form of preventative maintenance. If the insulation resistance falls below an accepted user dictated value or falling rapidly over time then cable. If during periodical testing insulation resistance of cable is found between 5 and 1 mω km at buried temperature the subject cable should be programmed for replacement. Whether it involves the connection cables the sectioning and protection equipment or the motors and generators the electrical conductors are insulated using materials with high electrical resistance in order to limit as much as possible the flow of current outside.

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. Test results are dependent on the temperature of the insulating material and the humidity of the surrounding environment at the time of the test. S iec 60840 edition 4 0 2011 11 iec standards power cables with extruded insulation and their accessories for rated voltages above 30 kv um 36 kv up to 150 kv um 170 kv test methods and requirements câbles d énergie à isolation extrudée et leurs accessoires pour des tensions.