Abstmct4oninvasive vibmtion diagnostic techniques plf? implemented to assess the mechanical condition of power cizcuit breakers. A diagnostic system, the Prototype Commercial PoltaMe Diagnostic System (E"DS) has been developed Hardware of the €"DS includes a poltable computer, and a data acquisition unit and computer communication cruds. Signal pmcessing techniques include the discrete energy sQCstics envelope, short-time p w e r spectnmq timing extraction algorithm and chi-square based shape test Decision-making is canied out via a voter pmgiam, to which individual resulb fmm the timing and shape analysis pm~grams am passed. Statistical and empirical htsholds have been established, that classify the cinxit breaker as Wig in Normal-Transitional-Abnormal (Green-Yellow-Red) condition.

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E l e c t r i c Power Research I n s t i t u t e Palo Alto, A b s t r a c t -The e v a l u a t i o n of t h e mechanical c o n d i t i o n of a c i r c u i t b r e a k e r , Le, w h e t h e r t h e u n i t i s i n normal or abnormal c o n d i t i o n , h a s been s u c c e s s f u l l y c a r r i e d o u t t h r o u g h t h e a p p l i c a t i o n of n o n i n v a s i v e d i a g n o s t i c s , t o g e t h e r w i t h s i g n a l p r o c e s s i n g a n d d e c i si on-making technique s Through t h e methodol ogy, q u a n t i t a t i v e ( n u m e r i c a l ) a s s e s s m e n t of a c i r c u i t breaker f o r any o p e r a t i n g c o n d i t i o n h a s been a c h i e v e d , w e r e c a r r i e d o u t a t t h r e e manuf a c t u r e r s a n d a t t h e U n i v e r s i t y a t B u f f a l o . I n a l l cases, t h e presence of a b n o r m a l i t i e s was detected.