Charge Accumulation i Polymeric Insulating Plat under Various Temperatures and High DC Stresse

High V o l t a g e power cab les u s i n g p o l y i n s u l a t i n g m a t e r i a l s have been used w i d e l y i n t r a n s m i s s i o n cab les . However, i t i s w e l l known t h a space charges a r e accumulated i n d i e l e c t r i c s unde v o l t a g e s [ l ] . The charge d i s t r i b u t i o n o f p o l y e t h y l e n e has been observed u s i n g t h e p e l e c t r o a c o u s t i c (PEA) method [ 2 ] under h i g h DC s t r e As a m a t t e r o f f a c t , power cab les a re heated by J o u l e l o s s d u r i n g i n s e r v i c e pe r iod . Then i n f o r m a t i o n r e l a t e d t o t h e accumulated c d i s t r i b u t i o n a t e l e v a t e d tempera tures i s v a l u a b l e i study o f i n s u l a t i n g m a t e r i a l s . I n t h i s paper we r e p o r t t h e charge d i s t r i b u t i o n s i n h i g h d e n s i t y p o l y e t h y l e n e (500um) under h i g h DC v o l (5kV o r 10kV). The meaprementa were made tempera tures r a n g i n g f rom 40 C t o 80 C.