Date of Graduation

1979

Document Type

Dissertation/Thesis

Abstract

Many a c c id e n ts and f a t a l i t i e s in underground c o a l mines are caused due to in a d e q u a te ly d esig n ed e l e c t r i c a l power sy stem s. These a c c id e n ts may be g r e a tly reduced i f c o a l-m in e power sy stem s are d esig n ed s t r i c t l y a cco rd in g to IEEE, NEMA and ANSI sta n d a rd s. The o b j e c t iv e ’ o f t h i s r e se a r c h i s to develop te c h n iq u e s and comprehens iv e computer so ftw a r e fo r o p tim al d esig n o f co al-m in e power system s to a c h ie v e h ig h e s t d egree o f s a f e t y , r e l i a b i l i t y and perform ance a t a minimum c a p it a l c o s t . I t i s found th a t th e mine power system s are g e n e r a lly v o lta g e drop lim ite d and th e prim ary d is t r ib u t io n c a b le s have t o b e underr a te d by d if f e r e n t f a c to r s to a c h iev e th e d e sir e d v o lta g e drop. Based on t h i s , a procedure fo r o p tim a l s e le c t i o n o f th e primary d is t r ib u t io n v o lta g e i s p r e se n te d . The v o lta g e l e v e l s co n sid ered are 4160, 7200 and 12470 V. Once, th e v o lta g e l e v e l s a re determ ined, th e network components ( c a b le s , tra n sfo r m e r s, e t c . ) have t o be chosen based on th e m ining req u irem en ts. Methods are develop ed to s e le c t t r a i l in g c a b le s fo r c y c l i c a l l y v a ry in g lo a d s (such as a con tin u ou s m iner) based on a s t e a d y - s t a t e therm al m odel. A ls o , th e d esig n o f th e dc track haulage system i s a n a ly zed in d e t a i l . The econom ics o f u sin g p o w er-fa cto r c o r r e c tio n c a p a c ito r s i s a ls o d is c u s s e d . 220 A fte r a l l th e m ajor system components are s e le c t e d , i t i s o n ly l o g ic a l to a n a ly ze them as a system and check w hether a l l th e o p e r a tin g c o n s tr a in ts are s a t i s f i e d . To a c h ie v e t h i s , an a lg o rith m fo r th e lo a d -flo w a n a ly s is o f a c /d c d is t r ib u t io n system s i s d ev elo p ­ ed. This in c lu d e s adequate m o d ellin g o f th e r e c t i f i e r , form ation o f s u it a b le e q u a tio n s fo r th e ac and dc system s alo n g w ith appropria t e boundary c o n d itio n s and developm ent o f a s o lu t io n tech n iq u e fo r th e r e s u lt in g m onlinear problem . The same n o n lin e a r r e c t i f i e r model i s used in a n a ly z in g f a u lt s on th e dc system . Both b o lte d and a r c in g f a u lt s a re c o n sid er e d . A ls o , a program i s develop ed to a c h ie v e tim e -c u r r e n t c o o r d in a tio n o f v a r io u s p r o t e c t iv e d e v ic e s , such a s , r e la y s , f u s e s , e t c . . F in a lly , th e d if f e r e n t netw ork t o p o lo g ie s ( e .g . expanded r a d ia l, prim ary loop e t c . ) a re compared on th e b a s is o f r e l i a b i l i t y , a v a i l a b i l i t y and t h e ir a p p lic a b ilit y fo r co a l-m in e power d is t r ib u t io n .

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