to violent system v o l t a g e swings c r e a t e d b y t h e fluctuations of a steel-mill a r c -f u r n a c e l o a d i n t h e vicinity, m a k i n g it possible to observe t h e a c t i o n of t h e r e g u l a t o r u n d e r n o r m a l l o a d c o n d i t i o n s . T h e m a g n e t i c amplifier r e g u l a t o r w a s a p p l i e d o n u n i t n u m b e r 6 w h i c h is closely c o n n e c t e d to t h e 132-kv b u s a n d r a d i a l line s u p p l y i n g t h e steel mill l o a d . T h e M a g a m p r e g u l a t o r a n d e x c i t a t i o n system utilizes a d i r e c t -c o n n e c t e d b u c k -b o o s t exciter, t h e p r i n c i p a l source of excitation b e i n g a self-excited s h u n t field. B u c k a n d boost a m p e r e -t u r n s a r e s u p p l i e d from a p o w e r M a g a m p t h r o u g h s e p a r a t e exciter c o n t r o l fields. I n t e l l i g e n c e t a k e n from p o t e n t i a l a n d c u r r e n t t r a n s f o r m e r s a t t h e m a c h i n e t e r m i n a l s is fed t h r o u g h c o m p e n s a t i o n a n d limit circuits a n d c o m p a r e d w i t h a reference. T h e r e s u l t i n g difference, or e r r o r signal, is amplified b y a n i n p u t M a g a m p a n d u s e d to c o n t r o l t h e p o w e r M a g a m p . T h e a-c s u p p l y for t h e r e g u l a t o r is a d i r e c t -c o n n e c t e d 420-cycle p e r m a n e n tm a g n e t g e n e r a t o r . P e r f o r m a n c e tests w e r e c o n d u c t e d to d e t e r m i n e r e g u l a t o r o p e r a t i o n d u r i n g l o a d d r o p p i n g a n d n o r m a l l o a d c o n d i t i o n s w h i l e s u p p l y i n g t h e steel mill l o a d . T e s t s w e r e m a d e also to verify t h e o p e r a t i o n of t h e m i n i m u m e x c i t a t i o n limit a n d to d e t e r m i n e t h e e x c i t a t i o n system response r a t i o . Because t h e p r e s e n t definition of exciter response r a t i o was w r i t t e n w i t h t h e r h e o s t a t i c r e g u l a t o r definitely in m i n d c e r t a i n a m b i g u i d e s a r r i v e in a p p l y i n g this definition d i r e c t l y to d y n a m i c r e g u l a t o r s . S e v e r a l m e t h o d s of testing for response r a t i o exist t h a t c o m e w i t h i n t h e w o r d i n g of t h e definition. S o m e m e t h o d s give a figure of r e s p o n s e r a t i o w h i c h is a function of exciter a n d self-excited field r h e o s t a t only a n d d o n o t give a n y i n d i c a t i o n of t h e ability of t h e r e g u l a t o r a n d pilot exciter t o force. T h e oscillograph r e c o r d of t h e response r a t i o test is s h o w n in Fig. 1. T h e response r a t i o d e t e r m i n e d from t h e oscillogram is 1.63. T h e m e t h o d used in this test p r o v i d e s a m e a s u r e of t h e response of exciter a n d r h e o s t a t , pilot a n d r e g u l a t o r , a n d d a m p i n g m e a n s . T h e o n l y concession Digest of paper 54-41, "Magamp Regulator Tests and Operating Experience on West Penn Power System," recommended ...
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