The pollution is one of the most important problems facing the
electrical networks, especially in the Syrian Arab Republic, and
after that expanded of pollution sources on the one hand, and
because the power supply has become related to all economic
and daily life sections.
The problem of gliding discharges on high voltage equipment is faced in practice, coith inclined interface, such as cable terminations, bushings.
Many researches present very important results about the relationship between the applied voltages and
this partial discharge . But studies about the insulation systems that have small cross capacitor or that have air gaps are limited, considering many points, one of them: the discharge procedure looks
like the partial discharge in insulators, with longitudinal interfaces.
Achieving precise relationships for such systems and finding the actual discharge behavior gives high scientific efficiency and important application for design of high voltages devices, especially when high voltages, which are changing with time voltage like alternatring and lightning voltages, are applied.
