A 230-Kv 3-Cycle Oil Circuit Breaker for Extra-Heavy Arc Rupturing Duty

High-voltage oil circuit breakers

“…O N L Y a few years a g o , 3,500,000 k v a w a s t h e m a x i m u m s t a n d a r d r a t e d i n t e r r u p t i n g c a p a c i t y for h i g h -v o l t a g e circuit b r e a k ers, a n d t h e i n t e r r u p t i n gt i m e r a t i n g s w e r e mostly five a n d e i g h t cycles. T h i s article describes r e c e n t d e v e l o p m e n t s in i n t e r r u p t i n g devices t h a t h a v e m a d e a v a i l a b l e s t a n d a r d circuit b r e a k e r s for 5,000,000-kva i n t e r r u p t i n g c a p a c i t y a n d 3-cycle i n t e r r u p t i n g t i m e for 138-, 1 6 1 -, a n d 230-kv voltage classes.…”

“…I n a p a p e r b y L e e d s a n d C u s h i n g , 3 t h e e l e m e n t s of a steel-tank circuit b r e a k e r for h e a v y -d u t y i n t e r r u p t i o n a t h i g h s p e e d w e r e o u t l i n e d . Because of t h e relatively small a m o u n t of gas associated w i t h t h e i n t e r r u p t i o n of h i g h -p o w e r arcs u s i n g m o d e r n i n t e r r u p t i n g devices, t h e t a n k d i a m e t e r a n d c l e a r a n c e s T h e r e l a t i v e size of four different i n t e r r u p t e r assemblies r a t e d 5,000,000 k v a a t 138, 1 6 1 , a n d 230 k v a n d 10,000,000…”