no levitation insulation design for particles no intersection of electric field line from high-voltage conductor to spacer * small value of En coordination o f insulation strength between dc and lightning impulse Hitachi, Ltd. diagnosis Abstract ---The paper describes t h e development of insulation structure and enhancement of insulation r e l i a b i l i t y of 500 k V dc GIS. Considering problems o f m e t a l l i c particles and charge accumul a t i o n on spacers, t h e developed insulation structure of GIS c o n s i s t e d o f three r e g i o n s , i . e . t h e spacer, particle s c a v e n g i n g and n o n -l e v i t a t i n g r e g i o n s . Particles could b e e f f i c i e n t l y scavenged, and the developed GIS w i t h s t o o d all insulation specificat i o n s with sufficient margins under the clean and particle-contaminated condition. Now, a long-term s i t e test for o n e year of t h e 5 0 0 kV dc GIS has been continued s i n c e October in 1995.
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