Measurement of the post arc current of HV circuit breakers: application to short circuit tests with ITRV

Abstract

A few years ago, some power t e s t l a b o r a t o r i e s and man-short-circuit with ITRV On the basis of exufacturers acquired f a c i l i t i e s f o r measuring t h e postarc current in SF6 circuit Such measurements p e r i m e n t a t i o n carried o u t on two c i r c u i t b r e a k e r s : have been improved t o produce f u r t h e r comparison w i t h one h a v i n g a h i g h p o s t -a r c c u r r e n t l e v e l , and t h e modeling. o t h e r showing no detectable p o s t -a r c c u r r e n t . Calculations based on experimentation on two c i r c u i t breakers, one having a high post-arc current l e v e l , t h e other not having a detectable post-arc current, have enabled us t o compare 3 ITRV t e s t c i r c u i t s . The main conclusion i s t h a t t h e i n t e r n a t i o n a l standard, i n speci f y i n g s t r e s s e s and not c i r c u i t s , does not lead t o not a b l e differences i n t h e s e v e r i t y of t h e tests. Keywords : C i r c u i t b r e a k e r , p o s t -a r c , measurement, modeling.I " A few y e a r s ago, some power test l a b o r a t o r i e s 11,21 and m a n u f a c t u r e r s 131 acquired f a c i l i t i e s f o r measuring t h e p o s t -a r c c u r r e n t i n SF6 c i r c u i t b r e a k e r s .The ideal c i r c u i t b r e a k e r would be a n a p p a r a t u s w i t h z e r o r e s i s t a n c e d u r i n g t h e c u r r e n t p e r i o d , and t h e n i n f i n i t e r e s i s t a n c e immediately a f t e r c u r r e n t z e r o . I n r e a l i t y , t h e arc r e s i s t a n c e cann o t i n c r e a s e i n f i n i t e l y q u i c k l y . The r e s u l t i s a "post-arc" c u r r e n t a f t e r t h e c u r r e n t p a s s e s t h r o u g h z e r o ( f i g . 1 ) . Its a m p l i t u d e and d u r a t i o n are dependent b o t h on t h e c o n d i t i o n s imposed by t h e t e s t c i r c u i t (I, d V / d t ) and on t h e t e c h n o l o g y o f t h e c i r c u i t b r e a k e r : t y p i c a l l y 20 A f o r 25 ps f o r an air-blast c i r c u i t b r e a k e r , and 1 A f o r 1 ps f o r a n SF6 b r e a k e r .F i g . 1 : t h e p o s t -a r c c u r r e n t c a t i o n s f o r s e e n 1 4 1 . On t h e one hand, p h y s i c a l . , models t e n d t o be u s e d a t t h e d e s i g n s t a g e of an equipment. On t h e o t h e r hand, "black box" models The lower t h e Value t o be measured, t h e more d i fb a s e d on an o v e r a l l view of t h e electric arc, as a f i c u l t i t i s t o measure t h e p o s t -a r c c u r r e n t . In n o n -l i n e a r r e s i s t o r w i t h memory, are v e r y s u i t a b l e p a r t i c u l a r , f o r HV SF6 c i r c u i t b r e a k e r s , t h e r e are f o r s i m u l a t i n g t h e " a r c -c i r c u i t " i n t e r a c t i o n . r a t i o s of 1 0 0 000 : 1 between t h e c u r r e n t peak a t T h i s l a s t t y p e of modeling n a t u r a l l y f i n d s a place 50/60 HZ and the peak Of the post-arc i n a c i r c u i t b r e a k e r t e s t l a b o r a t o r y , where it i s Other d i f f i c u l t i e s must...

Συμβολη Στην Αναπτυξη Μαθηματικων Εργαλειων Για Ψηφιακη Εξομοιωση Της Συμπεριφορας Μετασχηματιστων Και Διακοπτων Ισχυος Σε Ταχεα Ηλεκτρομα- Γνητικα Φαινομενα

“…Στη συνέχεια, το μοντέλο μπορεί να χρησιμοποιηθεί για προσομοίωση παρομοίων καταστάσεων διακοπής. Έτσι, στις εργασίες [91][92][93][94][95] παρουσιάζονται μέθοδοι εκτιμήσεως των παραμέτρων των διαφόρων τροποποιημένων μοντέλων του Mayr, ενώ στην εργασία [96], δίνεται μία μέθοδος εκτιμήσεως των παραμέτρων του μοντέλου του Urbanek. Ακολούθως, τα μοντέλα αυτά χρησιμοποιούνται για προσομοίωση διακοπής επαγωγικών πηνίων αντισταθμίσεως ή χιλιομετρικών σφαλμάτων.…”