|
Surface
Discharge at RWE Eurotest Lab (Germany)
Dirk
Borneburg, Dpl.-Eng.
A
partial discharge (PD) test, carried out at RWE Eurotest on a silicon
cable revealed high partial discharge levels that could not be explained.
Through the use of DayCor II™ camera the location was revealed
on the surface of the cable termination (fig 10). The surface, seemingly
clean, needed to be thoroughly washed to stop the PD activity on
the termination. According to Dirk Borneburg from RWE Eurotest,
conducting particles from the cable adhered to the cable surface
during the mounting and caused the PD. Dirk Borneburg concluded
that the DayCor camera was the correct tool for easy detection of
such problems, that if unattended, might lead to degradation of
the polymer termination and to its puncture. A similar case was
detected by the French service company C&M, and is presented
in fig 11.
--up>
|
Fig 10
fig 11: RSA 20 kV - a punctured cable terminatio
|
