Inspection Instructions Tap Changer D III & D I 400 PDF

MASCHINENFABRIK REINHAUSEN GEBRUDER SCHEUBECK KG R E G E N S B U R G FALKENSTEINSTRASSE 8 Telefon (0941) 4023 Telex 6 5881...

MASCHINENFABRIK REINHAUSEN GEBRUDER SCHEUBECK KG R E G E N S B U R G FALKENSTEINSTRASSE 8 Telefon (0941) 4023 Telex 6 5881 MR INSPECTION INSTRUCTIONS K d - N o. 026605 T A P C H A N G E R D IIT 200 A N D D I 400 Contents I General... oui i n i t i a Page 2 2 | Withdraw ing t h e diverter s w i t c h insert............... Page 3 3 Disassemb ly o f t h e diverter s w i t c h i n s e r t............. Page 4 4 Cleaning a n d c h e c k i n g.................... uuu... Page 5 5 Checking o f contact w e a r...................... I Page 6 6 R e p l a c e m e n t o f contacts............................. Page 6 7 A s s e m b l y a n d installation o f diverter s w i t c h insert..... Page 7 8 Carrying out t r i a l switching o p e r a t i o n s a n d c h e c k i n g limit positions... «coi iii eee. Page 8 9 Function test o f protective device RS 1 0 0 0.............. Page 8 10 I n s p e c t i o n o f p r o t e c t i v e d e v i c e o f t r a n s f o r m e r.......... Page 9 11 Enclosure List of screws, nuts etc. to be loosened when dis- assembling t h e diverter s w i t c h i n s e r t................. P a g e 10 A d j u s t m e n t plan......... iii eee Page 11 M a i n a n d a u x i l i a r y c o n t a c t s o f d i v e r t e r switch.......... P a g e 12 Parts list... oii ee P a g e 13 Sectional drawing of the complete tap changer.......... Page 14 Schematic view o f diverter switch o i l s e p a r a t i o n....... P a g e 15 General The tap changer consists o f 3 main components a) t a p changer h e a d with diverter s w i t c h o i l v e s s e l b) diverter s w i t c h i n s e r t with d i v e r t e r s w i t c h a n d transfer resistors c) t a p s e l e c t o r with p r e s e l e c t o r T h e l o a d t r a n s f e r from t h e t a p i n u s e t o t h e next t a p already p r e s e l e c t e d b y t h e t a p s e l e c t o r i s effected b y t h e h i g h - s p e e d diverter s w i t c h v i a ohmic transfer r e s i s t o r s. T h e load t r a n s f e r t i m e o f t h e diverter switch t a k e s about 0. 0 2 7 - 0. 0 3 7 seconds. T h e diverter s w i t c h h a s i t s o w n o i l v e s s e l while t h e tap s e l e c t o r i s p l a c e d i n t h e transformer o i l. T h u s t h e diverter switch and tap s e l e c t o r have s e p a r a t e o i l compartments. ’ I n o r d e r t o obtain a maximum o f reliability i n s e r v i c e w e r e c o m m e n d t o o b s e r v e strictly the inspection i n s t r u c t i o n s published b y u s. T h e s e i n - structions i n d i c a t e the i n s p e c t i o n intervals i n dependance o n t h e n u m b e r o f s w i t c h i n g o p e r a t i o n s and t i m e o f s e r v i c e. T h e i n s p e c t i o n i s l i m i t e d t o t h e d i v e r t e r switch only since t h e tap s e l e c t o r o p e r a t e s f r e e o f w e a r. T h e i n s p e c t i o n o f t h e diverter s w i t c h c o m p r i s e s first o f all t h e c l e a n - i n g o f t h e i n s u l a t i n g p a r t s and t h e c h e c k i n g o f t h e contact w e a r. I f d a m a g e s o r faults a r e found o n t h e t a p c h a n g e r w h i c h i m p a i r t h e func- t i o n a l efficiency t h e m a n u f a c t u r e r s Maschinenfabrik Reinhausen Gebriider Scheubeck KG. 8400 Regensburg 2 P o s t f a c h 437 T e l e p h o n e : ( 0 9 4 1 ) 4023 Telex: 065 881 s h o u l d b e i n f o r m e d o r t h e i r a u t h o r i z e d r e p r e s e n t a t i v e without d e l a y. T h e i n s p e c t i o n o f t h e d i v e r t e r s w i t c h c o v e r s t h e following p r o c e d u r e s : withdrawing a n d disassembling c l e a n i n g and c h e c k i n g assembling and inserting putting again i n s e r v i c e. During t h e s e p r o c e d u r e s attention m u s t b e p a i d t o t h e u t m o s t cleanli- ness and c a r e f u l n e s s. T h e i n s p e c t i o n w o r k i s t o b e c a r r i e d out d u r i n g dry weather and without interruption s o that t h e insulating p a r t s a r e not l o n g e r than n e c e s s a r y (about 10 h o u r s ) exposed t o t h e a t m o s p h e r e. Withdrawing the diverter switch insert T h e diverter s w i t c h i n s e r t c a n b e withdrawn with t h e t a p changer i n a n y position, a) s h u t - o f f a l l c o c k s between: t a p c h a n g e r and o i l c o n s e r v a t o r (123) t r a n s f o r m e r a n d o i l c o n s e r v a t o r (102) b) o p e n o i l d r a i n plug (201) o n t h e t a p c h a n g e r h e a d a n d venting s c r e w (107) o n t h e t a p c h a n g e r h e a d c o v e r - d r a i n o i l - about 15 1. 201 106 109 107 R S 1000 123 c) B o l t s (109) and w a s h e r s (110) u n s c r e w. 0). R e m o v e t a p c h a n g e r h e a d c o v e r ( 1 0 6 ) a n d g a s k e t (108). d) r e m o v e n u t s (117) a n d c o m p r e s s i o n s p r i n g s (118). e) lift u p vertically t h e d i v e r t e r s w i t c h i n s e r t b y m e a n s o f ‘supporting l u g s (302). Weight: about 100 k p : M i n i m u m withdrawal h e i g h t : it depends o n t h e s e r i e s voltage, see t a b l e o n p a g e 5. Disassembly of the diverter switch insert D u r i n g a periodical i n s p e c t i o n a n d i f t h e diverter switch o i l i s not much contami- n a t e d it i s not necessary t o c o m p l e t e l y disassemble the diverter switch insert. I n t h e m a j o r i t y o f c a s e s it i s sufficient to remove a contact shell for the purpose o f cleaning the diverter switch elements and c h e c k i n g t h e contact w e a r. I f further d i s a s s e m b l y o f t h e diverter s w i t c h s h o u l d b e necessary p r o c e e d a s indicated below: f) r e m o v e s c r e w s with l o c k w a s h e r s a n d n u t s (310) at supporting flange (309).- g) lift u p v e r t i c a l l y supporting c y l i n d e r ( 3 0 7 ) i n c l u d i n g diverter insert head (301). The lower part o f the support- ing flange (309) i s provided with a g u i d e p i n M. (Figures 4 a n d 5 ). Attention! When putting down t h e supporting c y - linder (307) take care not to damage t h e driving shaft (308). 308 Fig. 4 h) remove resistor connecting bolts (316) and lock washers. With- d r a w v e r t i c a l l y t h e t r a n s f e r r e s i s t o r s (315). i) r e m o v e bolts and l o c k w a s h e r s ( 3 1 3 , 3 1 4 , F i g. 4) o f diverter switch supporting flange (310) and d i v e r t e r s w i t c h b e a r i n g p l a t e (325). T a k e off c o n t a c t s h e l l s ( 3 1 1 ) with t h e stationary c o n t a c t s ( 3 1 9 , 3 2 0 ) but n o t m o r e than t w o a t a t i m e s o. that t h e moving c o n t a c t s y s t e m (321) i s not completely u n t e n s i o n e d. 311 317 Fig. 5 322 323 325 321 319 320 TABLE O i l filling o f Series voltage diverter switch Minimum withdrawal o i l vessel height '"H" 30 k V about 70 k p 820 m m 45 kV about 8 0 kp 900 mm 60 kV about 8 5 kp 980 mm 80 kV about 9 5 kp 1260 mm 110 kV about 1 1 0 kp 1360 mm 150 k V about 120 k p 1460 m m Cleaning and checking All i n s u l a t i n g p a r t s and m e t a l p a r t s have t o b e carefully c l e a n e d. F o r t h i s p u r p o s e transformer o i l , g a s o l i n e , t r i c h l o r e t h y l e n ( C _ H C l , ) a n d s i m i l a r m a y b e u s e d. A b o v e all t h e i n s u l a t i n g c y l i n d e r s ( 3 6 7 , 1 , F i g. 3 a n d 5) a n d t h e t r a n s f e r r e s i s t o r s ( 3 1 5 , F i g. 5) h a v e t o b e c l e a n e d f r o m s o o t , i f a n y , a n d f l u s h e d w i t h t r a n s f o r m e r oil. Furthermore the tap changer head (103, F i g. 1) and the diverter swité¢h o i l v e s s e l ( 2 0 3 , e n c l. 5 ) , a s far a s a c c e s s i b l e , have t o b e c l e a n e d f r o m o i l s o o t with a n o n - f i b r o u s p e n c i l ( n y l o n p e n c i l ) o r a brush. T h e r e u p o n t h e d i v e r t e r o i l v e s s e l i s t o b e c o m p l e t e l y p u m p e d o u t , t h e o i l s o o t , i f any, t o b e r e m o v e d at t h e o i l v e s s e l bottom ( 2 0 7 , e n c l. 5) a n d t o b e flushed with fresh t r a n s f o r m e r oil. A f t e r t h e cleaning, all p a r t s a r e t o be c h e c k e d f o r t h e i r g o o d condition. This c h e c k i s t o b e a p p l i e d t o the insulating cylinders (307, 311, F i g. 3 and 5), t h e energy accumulator d e v i c e ( 3 0 4 , F i g. 3 ) , t h e transfer r e s i s t o r s ( 3 1 5 , F i g. 5) | t h e f i x e d m a i n a n d auxiliary contacts (319, 320), the moving contact system (321) with the main and auxiliary c o n t a c t s ( 3 2 2 , 3 2 3 ) , the connecting contact leads (326 and 327 see encl. 5) for t h e m a i n and auxiliary c o n t a c t s. = Checking of contact wear Contact burning o n t h e f i x e d a n d moving m a i n and auxiliary c o n t a c t s ( 3 1 9 , 3 2 0 , 3 2 2 , 323) h a s t o b e m e a s u r e d. T h e admissible c o n t a c t burning o f 5 m m given a s a maximum i n e n c l. 3 must nét b e exceeded. Replacement of contacts S p e c i a l attention h a s b e e n p a i d t o simplify r e p l a c e m e n t o f c o n t a c t s s u b - j e c t t o burning. The fixed main contacts (319) a r e e a c h fastened at the contact shells(311) by two countersunk screws CV 87/10 M6 x 15 mm. T h e f i x e d auxiliary c o n t a c t s ( 3 2 0 ) a r e e a c h a t t a c h e d b y t w o s c r e w s M 6 x 12. T h e m o v i n g m a i n a n d auxiliary c o n t a c t s ( 3 2 2 , 3 2 3 ) a r e f a s t e n e d t o t h e contact supports by means of two sérews M8 x 22 mm. After r e p l a c e m e n t o f c o n t a c t s t h e fastening s c r e w s have t o b e l o c k e d carefully again. 311 Assembly and installation T h e m o v a b l e c o n t a c t s y s t e m ( 3 2 1 , F i g. 6 ) i s brought into t h e m i d - p o s i t i o n b y means o f t h e d i v e r t e r s w i t c h operating k e y. Check whether the adjustment pins o f the contact springs "f'" a r e in the provided notches o f the tap changer s t a r. ( F i g. 6). F i x f i r s t contact s h e l l s ( 3 1 1 , F i g. 5 a n d 6) o n t h e supporting flange ( 3 0 9 ) b y s c r e w s ( 3 1 3 ) M 6 x 1 5 a n d l o c k washers. After p r e s s i n g t h e c o n t a c t s h e l l s a g a i n s t t h e d i v e r t e r switch b e a r i n g p l a t e ( 3 2 5 ) a n d aligning t h e m t h e c o n t a c t s h e l l s a r e n o w t o b e f a s t e n e d b y s c r e w s (314) M 6 x 1 8. F o r this p u r p o s e tighten t h e s c r e w s a s f a r a s p o s s i b l e b y hand a n d t h e n only b y a w r e n c h. I n s e r t vertically t r a n s f e r r e s i s t o r s (315) Tighten a l s o r e s i s t o r connecting s c r e w s (316) a s far a s p o s s i b l e b y h a n d b e f o r e u s i n g a w r e n c h s o that t h e t h r e a d o f t h e r e s i s t o r connect- ing socket will n o t b e damaged. T h e r e u p o n put i n p l a c e vertically supporting cylinder (307) including energy accumulator device. The guide pin '"M'" has t o be slided into the hole provided f o r on the s u p p o r t i n g c y l i n d e r f l a n g e ( 3 0 9 ). I f necessary m o v e t h e d r i v i n g r o d o f t h e e n e r g y a c c u m u l a t o r until t h e driving shaft (308, F i g. 4) engages. A f t e r i n s e r t i n g t h e s u p p o r t i n g flange s c r e w s (310) a n d t h e i r l o c k w a s h e r s o n t h e supporting flange (309) and tightening t h e m , t h e a s s e m b l y o f t h e diverter insert i s c o m p l e t e d. It must once more be checked whether all screw joints are tightened and carefully locked. T h e d i s t a n c e o f t h e e l e c t r o d e s o f t h e s p a r k gap h a s t o b e c h e c k e d. ( 3 1 8 ). Distance between electrodes: 5 mm (Fig. 4). B e f o r e r e i n s t a l l i n g t h e diverter s w i t c h i n s e r t it i s n e c e s s a r y t o pay a t t e n t i o n t o t h e p o s i t i o n o f t h e n o n i n t e r c h a n g e a b l e d r i v e c o u p l i n g (303, F i g. 2 ). T h e diverter s w i t c h i n s e r t i s i n t r o d u c e d v e r t i c a l l y a n d c a r e - fully i n t o i t s o i l v e s s e l. I f t h e insert i s p r o p e r l y s e a t e d i n t h e t a p c h a n g e r h e a d (103) t h e 4 p r e s s u r e s p r i n g s (118) a r e s l i p p e d o v e r t h e studs and the nuts (117) s c r e w e d o n u p t o t h e end o f the t h r e a d ( F i g. 2). Now the diverter switch oil vessel must be filled with oil up to the level o f t h e i n s e r t h e a d (301). T h e r e u p o n s e v e r a l t r i a l s w i t c h i n g o p e r a t i o n s in either direction have t o b e effected by hand. Trial switching operations without oil filling are to be avoided as far as possible. N o w t h e t a p c h a n g e r h e a d c o v e r ( 1 0 6 ) with g a s k e t ( 1 0 8 ) i s put i n p l a c e and t i g h t e n e d. T h e g a s k e t (108) should b e dry. T h e t a p changer h e a d (103) i s f i l l e d v i a o i l c o n s e r v a t o r (with t h e v e n t i n g s c r e w o p e n ( 1 0 7 , F i g. 1)) with t r a n s f o r m e r o i l until it b e g i n s t o run out through t h e vent- ing s c r e w. After tightening t h e venting s c r e w t h e t a p c h a n g e r i s ready again f o r service. Carrying out trial switching operations and checking the limit positions Prior to re-connecting the transformer, trial switching o p e r a t i o n s b y operating t h e m o t o r drive m u s t b e c a r r i e d out a c r o s s t h e c o m p l e t e regulating r a n g e including t h e two limit p o s i t i o n s. T h e p o s i t i o n i n d i c a - t i o n i n t h e t a p changer h e a d a n d i n t h e m o t o r d r i v e m u s t b e c h e c k e d t o m a k e s u r e that it i s conform i n all positions. ‘The r e s p o n s e o f t h e e l e c t r i c a l limit s w i t c h i n t h e m o t o r d r i v e i s t o b e v e r i f i e d. T h e n a n o t h e r 2 t o 5 revolutions o f t h e h a n d c r a n k s h o u l d b e m a d e i n o r d e r t o c h e c k t h e m e c h a n i c a l limit s w i t c h. This c h e c k i s t o b e d o n e i n both d i r e c t i o n s ( R a i s e a n d Low). Function test of the protective device RS 1000 C h e c k i n g o f t h e p r o t e c t i v e d e v i c e R S 1000 i s l i m i t e d t o t h e p r o t e c t i v e d e v i c e flap and contact making o f t h e mercury s w i t c h. F o r t h i s p u r p o s e t h e fixing s c r e w s o f t h e c o v e r c a p a t t h e t o p o f t h e p r o t e c t i v e d e v i c e a r e r e m o v e d a n d t h e c a p c l a p p e d back. PLAN VIEW OF TEST BUTTONS WITH COVER REMOVED on i CONNECTIONS 2 3 2 3 ple |__ (TEST P u s H B U T T O N S Oo ©) - ¥ ¥F ; =» +H 9 oe [PF Tg. L— EA RESET TRIP | ea RESET TRIP Fig. 7 When one presses the push-button ""Off'' the protective device flap i s opened. I f t h e l e a d s a r e p r o p e r l y connected t h e t r a n s f o r m e r m u s t b e d e e n e r g i z e d b y t h e c i r c u i t b r e a k e r. N o w t h e p r o t e c t i v e d e v i c e flap i s visible in sloping position behind t h e inspection windows.  When one presses the push-button "Operation" the flap i s closed and t h e p r o t e c t i v e device i s again ready for service. I n this p o s i t i o n t h e inspection windows situated o n both sides o f the housing give f r e e view through them. After this t e s t t h e c o v e r cap i s c l o s e d o v e r t h e push-button and t h e fixing s c r e w s tightened. 10 Inspection of the protective device of the transformer After t h i s i n s p e c t i o n t h e t r a n s f o r m e r can again b e put into service. 11 Appendix Enclosure 1 to 6  LIST OF SCREWS, NUTS ETC. TO BE LOOSENED WHEN DISASSEMBLING THE DIVERTER SWITCH INSERT. THT, TTTTTTITITTTm 000000000000000 110 000000000000000 © C0 0 —_17 E 2 £ : 118 SEISRT Croa=—L mg Cl xg I EEE © 0 LBL Trt? TT°v°%Y TeeSY P99? ©9Te°TT 313 1111 [111 1111 N 777° °99Q °€9V | Trr1 TTrTIr 11171 314 c000 6060 060 0000 (109) 30 Bolts M 10 x 45 (313) 12 Screws M6 x 15 mm (110) 30 Washers M 10 12 Lock washers M6 (117) 4 Nuts M 12 (316) 12 Screws M5 x 30 mm (118) 4 P r e s s u r e s p r i n g s 22x58 m m 12 Lock washers M5 (310) 12 Screws M6 x 30 mm 12 Tubes 12 Washers M 6 (314) 12 S c r e w s M 6 x 1 8 mm 1 2 Nuts 12 Lock washers M6 ENCLOSURE 1 -10 -  Sense Coupling 1 i i Coupling 2. Ollw \ GL ~~ — n_ = Revolutions p e r switching operation GENERAL ADJUSTMENT PLAN Tap changer Type D ENCLOSURE 2 - 11-  —nr M A I N A N D AUXILIARY CONTACTS OF D I V E R T E R SWIT CH ae TI y, | A= | Li | py | a | EES burning burning surface surface | ~N AN | | Ef =% -— | | Ni | —=185 f= —— 1,5 = Q |. Ea | | TTT T I |) Moving main and Fixed main F i x e d auxiliary auxiliary contacts contact (319) contact (320) (322, 323) Contact material: E-Cu Admissible m a x i m u m contact burning " a " : 5 m m ENCLOSURE - 12-  (ONIMVHA TYNOILD3S ) S HUNSOTONH 00¢ I d YIONVHO-dVL AVOI-NO £08 ] > 509 | ind ay , 50S | dit > S08 607 407 - IW he 05 : 907 12} EJ Sa i ; ag — 2 3 2 m zy ly ? { 2 905 £09 ur 05 jo “5 90% \ ol pi] 4 40 106 | || 4 - 3 NOILO3S 3 209 807 £07 [4 0 200 Z E 902 S02 E e S— : J} 2 See 6IE ize : 14 ~ 7 AER oze 11S ue Q 200 — — — O A NERS Lg ale 1 [i [— we 2 Fly : m po) ole 60¢ HL sie 3 |; SIE m o Jad E02 I wn ze oce L0S | zg | 3 G-O NOILO3S 0 20” i I | LOE = = 90¢ = Zoi i wT =a} Far 90¢ 107 107 fp—erer [14 3 +] 7% Sx zoe oet 1 | < zz = ) AVES & | YEA wm NS 101 eg rr m ) a »0€ £€0¢ +44 3 L—-c=aim HL 0001 SY 22 3) 81 I NE hay x tog i 7; 121 Lo g © AY + J @ 2H =efel= Av ; $/ / £0! ll — AX e T T a To N e. 21 5 Zig am— i QUOT y soc = NN i Een 21] p s oor | you ou 1 zu | wu £01 | =fRee 0 p— /]] ou Sil 7it Loi £ll S01 102 8 - V NOILO3S Group 100 Tap changer head 101 mounting flange o n transformer tank 102 a i r outlet 103 t a p changer h e a d. 104 driving shaft w i t h drive shaft o u t l e t 105 p r o t e c t i v e device connection 1 " 106 c o v e r f o r t a p changer h e a d 107 venting s c r e w k 108 t a p changer h e a d gasket 109 bolts ie 110 washers 111 s a f e t y diaphragm 112 g a s k e t f o r safety diaphragm 113 c o v e r for safety diaphragm 114 inspection w i n d o w 115 inspection window gasket _- 116 c o v e r f o r i n s p e c t i o n window 117 fixing nut 118 c o m p r e s s i o n spring 119 p o s i t i o n indication d i s k 120 gearing supporting p l a t e 121 w o r m w h e e l w i t h Geneva c a m w h e e l 122 driving shaft with w o r m 123 oil shut-off cock Group 200 Diverter switch oil separation 201 o i l drain cock 202 oil v e s s e l flange 203 oil v e s s e l cylinder 204 "oil v e s s e l connecting contacts 205 oil v e s s e l output terminal 206 i oil v e s s e l connecting ring 207 oil v e s s e l bottom 208 oil v e s s e l grading ring Group 300 Diverter switch insert 301 Diverter s w i t c h insert h e a d 302 eye-bolts 303 drive coupling 304 energy accumulator device ( s u s p e n s i o n system) 305 diverter s w i t c h crank 306 detent p a w l 307 supporting cylinder 308 driving shaft 309 supporting flange 310 supporting flange b o l t s - 311 contact shells 312 potential plate 313 flange bolts, above 314 flange b o l t s , b e l o w 315 transfer resistors 316 r e s i s t o r connecting s c r e w s 317 sliding c o n t a c t 318 electrodes o f the spark gaps 319 f i x e d main c o n t a c t 320 f i x e d auxiliary contact 321 moving c o n t a c t s y s t e m 322 m o v i n g main c o n t a c t 323 moving auxiliary contact 324 diverter s w i t c h output terminal 325 diverter s w i t c h support 326 flexible contact l e a d s f o r m a i n c o n t a c t s 327 flexible c o n t a c t l e a d s f o r auxiliary c o n t a c t s G r o u p 400 Tap selector G r o u p 500 Preselector 401 geneva d r i v e 501 preselector drive 402 t a p s e l e c t o r d r i v i n g shafts 502 driving tube 403 tap selector gearing 503 driving bar 404 cage r i n g , above 504 insulating b a r s 405 cage ring, below 505 preselector contact 406 insulating b a r s 506 p r e s e l e c t o r switching c o n t a c t 407 t a p selector contact 408 contact bridge 409 segmental d r i v i n g t u b e s 410 t a p s e l e c t o r s w i t c h i n g contact PARTS-1IST 411 sliding ring 412 output terminal 413 tap selector center column ENCLOSURE 4 Diverter s w i t c h insert Venting s c r e w Oil drain cock — ;. Protective device RS 1000 [ = Diverter switch oil vessel — D i v e r t e r s w i t c h oil Oil vessel bottom Tap selector Preselector Transformer oil DIVERTER SWITCH OIL SEPARATION ENCLOSURE 6 (Schematic V i e w ) - 1 5-