TEVs are a very convenient phenomenon for measuring and detecting partial discharges as they can be detected without making an electrical connection or removing any panels.
22.
:: Partial discharges in cables are pretty serious, and after enough of them have happened the cable will fail and have to be replaced.
23.
Data collected during partial discharge testing is compared to measurement values of the same cable gathered during the acceptance-test or to factory quality control standards.
24.
With the partial discharge measurement, the dielectric condition of high voltage equipment can be evaluated, and electrical treeing in the insulation can be detected and located.
25.
Partial discharge measurement is applicable to cables and accessories with various insulation materials, such as polyethylene or paper-insulated lead-covered ( PILC ) cable.
26.
There is a secondary effect whereby electromagnetic waves generated by the partial discharge also generate TEVs on the surrounding metalwork the surrounding metalwork acting like an antenna.
27.
Where partial discharge is required to conform to IEC60137, paper and resin insulated conductors are used in conjunction with porcelain, for unheated indoor and outdoor applications.
28.
In paper-insulated high-voltage cables, partial discharges begin as small pinholes penetrating the paper windings that are adjacent to the electrical conductor or outer sheath.
29.
To measure the level of partial discharges, 50 60 Hz or sometimes a sinusoidal 0.1 Hz VLF ( very low frequency ) voltage may be used.
30.
Headquartered in Mississauga, Ontario, Canada, Iris Power is a supplier of on-line partial discharge testing of stator winding insulation in large motors and generators.
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