On-Load Tap Changer Type H Operating Instructions PDF

On-Load Tap Changer Type H Operating Instructions M R REINHAUSEN GERMANY /N\ WARNING The switching oil contained i n on-load tap-changers must be treated as a flammable liquid at all times. During on-load tap-changer operation, explosive switching gases may be...

On-Load Tap Changer Type H Operating Instructions M R REINHAUSEN GERMANY /N\ WARNING The switching oil contained i n on-load tap-changers must be treated as a flammable liquid at all times. During on-load tap-changer operation, explosive switching gases may be present underneath the on-load tap-changer cover, inside the pipe system, inside the oil conservator, and at the dehydration breather opening. I t is imperative to avoid the presence or formation of open fire, hot surfaces and sparks (caused e. g. by electrostatic charges) in the direct vicinity o f these danger zones. Potential ignition sources on the on-load tap-changer: Caution is mandatory when emptying the diverter switch oil compartment and oil conservator: Be sure to use only conductive and solidly grounded hoses, pipes, and pump equipment specifically approved for use with flammable liquids to prevent the ignition of any switching gases present. Use caution when removing the on-load tap-changer cover: Be sure to deactivate all auxiliary circuits prior to com- mencing any works at the on-load tap-changer cover (e. g. tap-changer monitoring, pressure relief valve, pressure-operated relay). For the duration of the works, the operation of electrical equipment and power tools (e. g. impact screwdrivers — spark formation) is strictly forbidden. It is mandatory to open the bleeder valve at the on-load tap-changer head cover while the stop valve between the oil conservator and the diverter switch oil compartment is open. It is furthermore imperative to let the switching gas accumulated underneath the on-load tap-changer cover evaporate while making sure of adequate ventilation (e. g. inside the transformer rooms and work tents). Once the switching gas has been removed and oil starts to flow from the bleeder valve, be sure to close first the bleeder valve and afterwards the stop valve between the oil conservator and the diverter switch oil compartment. Then reopen the bleeder valve and allow for some 5 to 10 liters of oil to drain off via the oil drain pipe (keep draining until the surface underneath the on-load tap- changer cover is free of oil). Always be sure t o remove the on-load tap-changer cover when draining the oil from the diverter switch oil conser- vator via the diverter switch oil compartment. Be sure to allow for a 15-minute waiting period to give the switching gases sufficient time to evaporate. Use caution when performing works at the dehydrating breather: When disassembling the dehydrating breathers i t is impor- tant to remember that explosive gases may be trapped inside the dehydrating breather or the piping. Even during due and proper operation, small quantities of explosive gases may escape from the dehydrating breather.  MASCHINENFABRIK REINHAUSEN BA 108/01 en — 0395/1000 Maschinenfabrik Reinhausen GmbH Printed in Germany Postfach 1 2 0 3 6 0 93025 Regensburg Phone +49-941-4090-0 Fax +49-941-4090-111 Telex 6 5 8 8 1 ON-LOAD TAP CHANGER TYPE H Operating Instructions No. 108/01 Contents oo Page 1. General............ esesseesiissesaiieete seesas anataRES SRe RAs e b Senateabeeben Rn anes 2 2. ShIPMENL....cooeeereererercrcrrernnrrssecesseenesessannesessaneeesssnies sanasesssensasersannes 3 3. Installation of the tap changer for cover mounting..............S O T 3 4. Installation of the tap changer into a bell-type tank..............cccocniunenns 4 5. Connection of tap winding and tap changer current take-off [eads...........ccccecrrercrerrerresreersrrssnnsessnsssessssnesssensnsninsss 6. Transformer ratio test.........ccceciiicireeccniccrerininmertireersissm neerssrmaresanesssons 8 7. Drying procedure and filling with Ol...........cccveiirrenerrrcnrrrertnreccnennne 8 8. Pipe CONNECLIONS....ccceeervererieecreerereessmrrsarsessnssssasecsannessnnsssrrssassesnsasssaes 9 9. Mounting the motor drive unit, the bevel gear and the drive S h a f t... 9 10. Putting the tap changer into operation at Please note: the transformer manufacturer.........cccoveecvicviisiimrcrerenseaceseersscsesssesanas 11 Drawings and illustrations contained 11. Transport to the installation Site.......cccecerccrircieeeercrrceererrrsisneerecssnneenne 12 herein may differ in detail from the tap changer equipment delivered. 12. Putting into service at the operating Site........cccvcvvvvrrvrccreirccnrrrrreesnen 12 They are for reference only and are subject to change without 13. Supervision during service, failures.........cceeeievcereerierreeirecreereecersenens 12 notice. 14. INSPECHONS....conereeceeererreirirereeessnreessaseeransssessessanseessonnrsssnasssnssnsassannernas 13 15. Appendix.....cc.ccccrerernercrsnersescnneseeressnarsrennsesaeses raerans adeanteinensansersaraiens 13 1. GENERAL Tap changer models H Ill 400 D-123 and H [11 400 D-145 without change- over selector are available up to 1 4 A WARNING: The tap changer is constructed as a and with change-over selector up to The on-load tap changer i s t o b e used selector switch of tubular design. 27 operating positions. The tap chan- only with the transformer specified i n It combines the functions of a diverter ger models H l l 400 Y/D, however, the tap changer order. switch and of a tap selector. are for 17 or 33 operating positions Installation, electrical connection a n d putting i n t o service o f t h e on-load tap The switching oil is separated from only. changer must b e carried o u t exclusively the transformer oil by means of the These Operating Instructions apply to b y qualified, skilled personnel a n d i n pressure-proof oil compartment. accordance with these Operating the standard models of the tap chan- Instructions. The tap changer is attached to the ger variants specified below which are D o not alter o r modify t h e e q u i p m e n t transformer cover by means of the tap available with or without change-over without consulting MR beforehand. changer head. selector: Disregard o f these Operating Instruc- If required, the selector switch is Three-phase tap changers for t i o n s a n d improperly performed work neutral end application during installation, electrical connec- equipped with a change-over selector. t i o n a n d putting i n t o service o f the on- The design and the designation of the HI1il1400Y load t a p changer m a y put a t r i s k the most important parts of the tap chan- Three-phase tap changers for any trouble-free operation of motor drive ger can be understood from the instal- connection unit, tap changer a n d transformer a n d lation drawings 895 800, 895 741 and H I l 1 4 0 0 D , H Ill 400 D-123, could result i n personal injury and damage o f property. 895 835 in section 15. H Ill 400 D-145 2. SHIPMENT Tap changer and motor drive are shipped in the adjustment position. The tap changer equipment is shipped as follows (insulating parts protected against moisture): Tap changer type H fig. 1: (H 11 400 Y/D, max. weight approx. 210 kg), fig. 2: (H 111 400 D-123, max. weight approx. 240 kg), fig. 3 : (H 11i 400 D-145, max. weight approx. 265 kg). Motor drive M A 7 (approx. 90 kg), fig. 4. or Motor drive MA 9 (weight approx. 60 kg), Drive shafts with coupling parts and bevel gear (max. weight approx. 20 kg), fig. 5. Protective relay RS 2001 (3.5 kg), fig. 6. The shipment is to be fully checked against consignment documents. 3. INSTALLATION OF THE TAP The parts must be stored in a dry CHANGER FOR COVER place until assembly. MOUNTING All tap changer parts must be left wrapped in their airtight protective cover and are to be removed only (For mounting a tap changer type shortly before installation. H 111 400 D-145 with the change-over selector attached outside, the tap Please note: changer head has to be removed. In general, drive shaft parts, bevel Please refer to section 4). gear and protective relay are packed with the tap changer. 3.1 Mounting flange A mounting flange is necessary in order to mount the tap changer head to the transformer cover. This mount- ing flange has to be constructed in accordance with the sealing surface of the tap changer head (see fig. 7 and section 15, drawing 895 800, 895 741, 895 835). To position the studs we recommend the use of a drilling template (see fig. 8 and section 15, drawing 895 183). If requested, the drilling template will be supplied with the first installation of a tap changer type H free of charge. 32 Attachment of the tap changer head to the transformer cover The tap changer is lowered through the cover aperture (= mounting flange) of the transformer and bolted by the tap changer head to the mounting flange. Proceed a s follows: ® Place the tap changer on a level surface. @ Clean the sealing surfaces of mounting flange and tap changer head. @ Put a n oil-resistant gasket o n the mounting flange. geous to put spacer blocks tempora- b y more than 5 t o 2 0 m m to @ Lift the tap changer by hooking up rily between supporting structure and reach its final position after the the tap changer head and carefully supporting flange and to remove them bell-type cover has been set up. lower the tap changer into the before setting up the bell-type cover. It is of advantage to install spacer opening of the mounting flange. ® Make sure not to damage the After mounting the bell-type cover blocks between the supporting struc- screening ring (with Up, = 123 kV raise the on-load tap changer by ture and the supporting flange in such only) and the tap changer termi- means of the lifting device (see dwg. a way that the on-load tap changer is nals. 890 180 in section 15). Now attach in its envisaged final position after the both the tap changer and the tap bell-type cover is set up. By this ® Check installed position of the tap changer head to the bell-type cover. measure the leads to b e connected to changer head. To attach the tap changer head to the the tap changer can be correctly @ Fasten the tap changer head to the dimensioned in length. mounting flange. bell-type cover we recommend the use of a mounting flange as described To connect the tap winding and the in section 3.1. tap changer take-off terminal follow the instructions according to section 5. 4, INSTALLATION O F THE 4.1 Installation of the tap changer TAP CHANGER INTO into the supporting structure /N\ CAUTION: A BELL-TYPE TANK Lift the tap changer into the supporting The connected leads must not (special design) construction. Make sure that the fap exert any force o n t h e tap chan- changer is in its proper mounting ger. Moreover, there must be (For mounting the H 111 400 D-145 tap position and fasten it there safely. sufficient clearance s o that i t i s changer, with outside attached possible to rise the tap changer IMPORTANT: change-over selector the mounting t o its final installation position procedure described in sections 4.3 to ~ I n the supporting structure the after the bell-type tank has been 4.7 applies accordingly). tap changer must be suspen- mounted. ded i n an exactly vertical To install the on-load tap changer into position. Drying procedure and transformer a transformer with bell-type tank the — The tap changer must be moun- ratio test are to be performed in tap changer has t o b e mounted onto a ted s o that i t need not be lifted accordance with sections 6 a n d 7. supporting structure. Therefore the on-load tap changer is equipped with a supporting flange at the oil compartment (= special design, see dwg. 896 762 in section 15). First of all lift the tap changer into the supporting structure and connect it to the tap winding. The tap changer has to be attached to the supporting struc- ture in such a way that it cannot be displaced. The supporting flange is provided with bores so that it can, without further measures, be provisionally secured to the supporting structure. It is advanta- »With built-in change-over selector« »without change-over selector or with 4 outside attached change-over selector« 4.2 Preparations Before setting up the bell-type cover, the tap changer head must be sepa- rated from the tap changer. - For the removal of the tap changer head the gear mechanism has to be removed. Make sure that the tap changer is in its adjustment position which is shown in the connection diagram supplied with the delivery. 4.3 Removal of the tap changer cover (fig. 9) * Unscrew the 24 screws M10 x 35/ wrench size 17, with lock washers). « Take off the tap changer cover. Take care of the cover gasket (fig. 10). 4.4 Removal of the gear mechanism The gear plate is attached to the tap changer head by 5 supporting arms (fig. 11, 12). Note the positions of the gear markings. Disconnection of suction pipe and spring energy accumulator. * Unscrew suction pipe connection R 3/4" (w.s. 27 and 39) and take care of the cover gasket. * Push the corresponding plug into the tap changer head. * Withdraw the fixing bolts for the spring energy accumulator from the tap changer head (fig. 13, 14). Keep all loose parts for later reinstallation. Removal of the gear mechanism: * Note the position of the gear markings for reinstallation. Unlock and loosen 5 screws M8 x 30/w.s. 13, (fig. 15, 16). * Withdraw the gear mechanism in upward direction. Note position of the centering support for later reinstallation (fig. 17, 18). Keep the removed gear mecha- nism (fig. 19, 20) and all loose parts for reinstallation. or »with built-in change-over selector« »without change-over selector or with outside attached change-over selector« 45 Separating the tap changer 4.7 Reinstallation of the gear head from the tap changer mechanism and attachment of the tap changer cover Loosen the fixing screws on the tap changer head (19 hex head screws Reinstallation of the gear mechanism M8 x 25/w.s. 13 with lock washers). is effected in the reverse order of its Keep the loose parts for reinstallation removal. (fig. 21). Set the gear mechanism to the adjust- ment position (see section 4.4, f i g. 1 1 , 12), as coupling and installation can A WARNING: be done only in this position. Attachment of the tap changer cover: Under all circumstances avoid dropping any parts into the oil Check the gasket before closing the compartment. Otherwise there cover. Use 24 screws M10 x 35/ i s the risk that the tap changer w.s. 17, with lock washers and fasten blocks and both tap changer ® Place the lifting traverse on the tap them uniformly (max. torque 35 Nm). and transformer are damaged. changer head a n d screw t h e 4 bolts Therefore, make s u r e that the M8/w.s. 13, into the supporting number of small parts i s com- flange (fig. 24, 25). plete when disassembling and ® Lift the tap changer slightly by A ATTENTION: reinstalling. Count them t o b e means of the lifting traverse Check the adjustment position sure. (see section 15, drawing 893 864, i n the inspection window at the 893 805), so that the oil compart- tap changer head. Lift off the tap changer head from the ment screws can be screwed in supporting flange. Be careful not to (19 hexagonal recess head screws damage the round rubber gasket of M8/w.s.13, secure by lock wash- the supporting flange and the two ers). adjustment bolts (fig. 22, 23). Tighten the screws uniformly with a maximum torque of 14 Nm. 4.6 Setting up the bell-type transformer cover ® Before setting up the transformer cover, clean the sealing surface of the supporting flange. Put the gasket on the supporting flange (fig. 22, 23). Withdraw the spacer blocks (see section 4.1). @ Lift the bell-type cover over the transformer active part and set up the bell-type cover. ® Before mounting the tap changer head clean the sealing surfaces (mounting flange, bottom of tap changer head). Place an oil- resistant gasket on the mounting flange. @ Position the tap changer head onto the mounting flange and pay atten- tion to the 2 adjusting bolts (fig. 22, 23), which ensure assembly in the correct position. Depending on the final height ad- justment leave a clearance of 5 to 15 mm between tap changer head and supporting flange. Fasten the tap changer head to the mounting flange. »Wwith built-in change-over selector« »without change-over selector or with outside attached change-over selector« 5. CONNECTION OF TAP WINDING AND TAP CHANGER TAKE-OFF LEADS The connection of the tap winding and They are provided with bores of 11 mm the tap changer take-off leads has to in diameter for the connection of cable be carried out according to the con- shoes to one side of the terminals of : nection diagram supplied with the par- the selector switch (fig. 26) or ticular tap changer equipment. the change-over selector in case of If connecting leads are crossing the H 111 400 Y/D and H Ill 400 D-123 surface of the oil compartment make (fig. 27, 28) or sure that there is sufficient clearance between the leads and the surface the outside attached change-over and to life parts of the tap changer. selector in case of H Ill 400 D-125 (fig. 29). The tap changer terminals are desig- nated according to t h e connection In case of tap changer type H {ll 400 Y diagram. (fig. 30) with neutral connection: This lead forms the neutral point of the tap changer and must not b e removed. A NOTE: The neutral point terminal is to be connected at this location. All connections t o the tap changer must b e made carefully and secured safely. The tap changer leads must be assembled i n such a way as to allow all leads t o b e connected t o the tap changer without tension. 6. TRANSFORMER RATIO 7.1.1 Vacuum-drying TEST 7.1.1.1 Drying in the vacuum autoclave We recommend to carry out ratio test- When drying the transformer i n the ing with a low a.c. voltage before dry- autoclave the tap changer cover ing of the transformer. must be removed. To operate the drive shaft in the tap * Heating up changer head a short tube of 25 mm the tap changer in air of atmos- nominal width with a screwed-in pheric pressure with a temperatu- coupling bolt of 12 mm diameter to- re rise of approx. 20 °C/hourto a gether with a hand wheel or a hand final temperature of at most 110°C. crank may be used. * Preparatory drying In case of motor drive MA 9 one drive in circulating air of at most 110 °C shaft revolution is required for one tap applied to the tap changer for a from the outside (w.s. 13, fig. 31) or change operation, and in case of duration of 10 hours. from the inside (w.s. 24). motor drive MA 7, 33 drive shaft * Vacuum-drying The kerosene drain plug is loss-proof revolutions are required. The selector at a temperature of at most 110°C and must be closed again after the switch action can be heard distinctly. applied to the tap changer and the drying procedure (max. torque 39 Nm). same drying time as for the trans- When operating the change-over former. 7.1.2.1 Kerosene drying in the vacuum selector (adjustment position + 1 step) which can be noticed as it takes more autoclave effort, the commenced tap change 7.1.1.2 Drying in the transformer tank When drying in the autoclave remove operation must always be completed If the transformer is to be dried in its the tap changer cover first. without changing the rotation sense. own tank the interior of the tap chan- * Heating up Keep the number of tap change ger must be connected to vacuum by by admitting kerosene vapor at a operations without oil to a minimum. a connecting pipe, as the tap changer temperature of about 90 °C. cover remains closed during the entire Keep this temperature constant for The end positions which can be drying process. about 3 to 4 hours. inferred from the connection diagram The tap changer cover is vacuum- * Drying supplied with the tap changer equip- proof. by increasing the kerosene vapor ment (positions designation) must never be overrun. Therefore, always To ensure sufficient drying of the temperature by about 10°C per interior of the oil compartment and the hour to the desired final tem- check the attained operating position incorporated tap changer insert, a perature, but at most to 125°C through the inspection window in the short by-pass tube of 25 mm nominal applied to the tap changer. tap changer cover. width must be connected between the The duration of the drying proce- After the transformer ratio test the tap transformer tank and a connecting dure is normally the same as that changer has to be set back to the ad- flange at the tap changer head that of the transformer. justment position (see the connection leads directly into the oil compartment. diagram delivered with the equip- 7.1.2.2 Vapor-phase drying in the Connect the by-pass tube either ment). transformer tank between flanges E5 and Q or flanges Es and R at the tap changer head If the transformer is to be vapor-phase (for position of connecting flanges treated i n its o w n tank, t h e kerosene see section 8). drain plug must be opened from inside the oil compartment. The tap changer Procedure, temperature, pressure and insert has to b e withdrawn and after- duration of the drying process are 7. DRYING PROCEDURE AND wards reinserted. Please contact u s described in item 7.1.1.1. FILLING WITH OIL for further instructions f o r removal and installation. 7.1.2 Vapor-phase drying process 7.1 Drying procedure Before starting the drying procedure, ATTENTION: As precondition for our guarantee of A the kerosene drain plug in the oil the dielectric properties of the tap compartment bottom must be opened The kerosene drain p l u g must changer a minimum drying treatment to drain the kerosene condensate from b e closed safely after the drying must be carried out according to the the oil compartment. process t o ensure that n o oil following instructions (either 7.1.1 or The kerosene drain plug has a hexa- from o i l compartment can flow 7.1.2). gon socket and can be unscrewed into the transformer tank! 8 7.1.3 Operating the tap changer 9. MOUNTING THE MOTOR DRIVE UNIT, THE BEVEL GEAR AND THE DRIVE A WARNING: SHAFT Do not operate the tap changer after drying without o i l wetting, 9.1 Mounting the motor drive unit. otherwise bearings and gaskets (see section 15, dimension will be damaged. drawings 895 660 and 893 381) You may find comprehensive mount- The tap changer must not b e operated ing instructions in our Operating before the oil compartment has been Instructions No. 40 for motor drive unit filled with oil. MA 7 or No. 80 for motor drive unit MA 9. 7.2 Filling with oil Please note: Close the tap changer head by the Please note: + The serial number of motor drive cover. Tighten all 24 cover bolts M10 * The stamped-on serial number unit and tap changer must b e equally (w.s.17, max. torque 34 Nm). must be the same as that of the identical (rating plate). tap changer. Tap changer and transformer are * Motor drive unit and tap changer simultaneously filled with new oil * The protective relay must be must be in the same operating under vacuum. mounted in horizontal position position. This adjustment position When filling the tap changer with oil, and as near to the tap changer is indicated in the tap changer pipe connection S or R on the tap head as possible. connection diagram supplied with changer head is to be used. To apply * The directional arrow on the the equipment. vacuum to the tap changer a by-pass protective relay must point to- ¢ The motor drive unit must b e tube between connections Eo and Q wards the oil conservator in mounted at the provided place on is to be installed in order to evacuate the mounted state. the transformer tank in a vertical both transformer and oil compartment * The pipe extending to the oil position and protected against simultaneously. conservator must have an in- excessive transformer vibrations. clination of at least 2%. A CAUTION: 8.2 Pipe connection S for 9.2 Mounting the bevel gear The o i l compartment and the suction pipe The bevel gear is to be attached to a associated o i l conservator must support on the transformer cover by This is the connection for the feeding be filled only with new mineral 2 bolts (through-bores of 18 mm dia- pipe of a stationary oil filter unit. If no insulating oil for transformers meter, see section 15, dwg. 892 916). oil filter is used, a pipe must be con- according t o IEC 296. The use of nected which ends with a drain cock at Please note: other oil puts at risk the trouble- the side of the transformer tank at free operation of tap changer and The stamped-on serial number operating height. ¢ transformer. of bevel gear and tap changer must be identical. 8.3 Pipe connection Q (special design, required for * The horizontal shaft end of the 8. PIPE CONNECTIONS stationary oil filter only) bevel gear must be in proper alignment with the shaft end of the This pipe connection serves for the upper gear unit o n the tap changer The tap changer head is provided with connection of the oil return pipe of a head. 3 pipe connections for different pur- stationary oil filter. If no oil filter is poses. Afterloosening the thrust collar connected, a dummy plug is mounted (4 bolts M10/w.s.17) these pipe con- instead of the pipe connection. nections can be freely swivelled (see fig. 32 and section15, dwg. 893779). 8.4 Connection flange Eo 8.1 Pipe connection R for protective This connection is closed by a dummy relay RS 2001 plug. It leads into the oil chamber of The mounting of protective relay the transformer tank directly beneath RS 2001 (see section 15, dimension the tap changer head and can, in case drawing 892 608) is pursuant to our of need, be connected to an accumu- Operating Instructions No. 59. lating tube for the Bucholz relay. e After loosening the thrust collar Before coupling of the upper gear unit (6 bolts M8/w.s.13) the upper gear of the tap changer head, adjust the unit can be freely swivelled correct adjustment position (inclusive (fig. 33). idling) as follows: In case of motor drive unit M A 7 : a) in case of motor drive MA 9 (1 re- Adjust the upper gear unit according volution per tap change operation) - to section 9.3b. Turn the drive shaft of the upper When having adjusted the thrust collar gear unit manually in both direc- it has to be tightened again with a tions until you feel that the spring max. torque of 15 Nm. energy accumulator winds up Tablock the screws. (fig. 34, 35). The above instructions apply analo- The middle of the rotation angle gously in case of bevel gears and (approx. 180°) is the exact adjust- diverting gears in special design and ment position (fig. 36). intermediate bearings of the vertical or Couple the drive shaft in this horizontal drive shaft. position. When producing the coupling, the square tube and the upper gear unit should be aligned with the smallest possible rotation 9.3 Mounting the drive shaft angle (max.45°). (square tube) b) in case of motor drive MA 7 The drive shaft must be mounted (33 revolutions per tap change according to our Operating Instruc- operation): tions No. 42. The drive shaft is the Loosen the screws of the tap chan- mechanical connection between the ger cover (24 screws M10/w.s.17, motor drive and the tap changer head. lock washers) and lift the tap The diverting from the vertical to the changer cover by at least 15 mm horizontal direction takes place until the gear unit disengages. through the bevel gear. Support the tap changer cover in Accordingly, when mounting, the verti- this position by suitable pieces of cal drive shaft is to b e attached bet- wood or the like. ween motor drive unit and bevel gear, Turn the upper gear unit on the tap whereas the horizontal drive shaft is to changer cover in the desired be attached between bevel gear and direction, so that its drive shaft is tap changer head. properly aligned with that of the In both cases the shaft connection is bevel gear. the same. The square tube is to be Check the position of the drive bolt connected on both ends to the re- at the outgoing side of the gear unit spective implement by two coupling hélow the tap changer cover and brackets and one coupling bolt. make it coincide with the coupling When mounting the drive shaft of the gear mechanism by turning make sure that the shaft ends t o the drive shaft manually. be connected are aligned exactly. Remove the wooden supports and fasten the tap changer cover again Square tubes, coupling brackets, by 2 4 screws M10/w.s.17, max. coupling bolts, screws, nuts and lock torque 3 4 N m and secure with tabs are made of stainless steel. spring washers. We recommend, however, to apply the same outside coating to these parts Finally, balancing of the lag of the as to the transformer tank. motor drive unit relative to the The square tube and the guard plate selector switch action must be which serves as foot step protection checked according to our Operat- for the horizontal drive shaft at the ing Instructions No. 40 for M A 7 transformer cover, are supplied in and No. 80 for MA 9. oversize (various standard lengths). These paris must be cut to the re- quired size before mounting. 10 10. PUTTING THE TAP CHANGER 10.2 Final oil filling INTO OPERATION AT THE Fill up and bleed the tap changer TRANSFORMER MANU- completely with transformer oil via the FACTURER oil conservator. In this connection bleed: 10.1 Operational tests * The tap changer head via the bleeder valve in the tap changer Before applying voltage to the trans- head cover (E, ) : former some test operations must be carried out to check the mechanical Open the screw cap M30/w.s. 36 functions of tap changer and motor (fig. 37) and lift the valve tappet drive. by means of a screwdriver. For these test operations the tap * The suction pipe (S) via the changer has to be run through the bleeder screw at the connecting entire operating cycle. elbow: cap nut M16/w.s. 22 (max. torque 9 Nm), slotted bleeder screw Make sure that i n each operating M6 (max. torque 2 Nm, fig. 38). position the indications of motor drive and tap changer (inspection window in the tap changer head) read the same position. JAN ATTENTION: Make sure that the suction pipe has been bled completely. FAN WARNING: The insulation capability of the A coupling fault between tap tap changer t o ground i s other- changer and motor drive unit wise significally impaired. exists, if tap changer and motor drive unit show different operat- ing positions. 10.3 Ground connections Misalignment of coupling bet- ween tap changer and motor Connect the ground screws of the tap drive unit leads t o severe damage changer head (2 screws M12 with of tap changer and transformer, nuts, w.s. 19, max. torque 60 Nm, if operation i s continued. fig. 39) to the transformer cover. Connect the ground screw M12/ w.s. 19, max. torque 60 Nm) of the Check, in both end positions, the auto- motor drive housing to the transformer matic switching off and the function of tank. the electrical and mechanical end position limitation (see Operating Instructions No. 40 for motor drive 10.4 Electrical transformer tests - MA 7 or Operating Instructions No. 80 for motor drive MA 9). After the afore-mentioned steps the electrical tests necessary for accep- tance of the transformer can now be performed. 11 11. TRANSPORT TO THE 12. PUTTING INTO SERVICE 13. SUPERVISION DURING hr INSTALLATION SITE AT THE OPERATING SITE SERVICE, FAILURES If the motor drive unit is to be de- Before putting the transformer into Supervision of tap changer and motor mounted for transport of the trans- service operational tests of tap chan- drive unit is limited to occasional former to the installation site, move ger and motor drive have to be per- visual checks of tap changer head, the motor drive into the adjustment formed according to section 10.1. protective relay and motor drive. position and then uncouple. The drive At the same time check the function of Pay special attention t o : shaft must be secured against un- the protective relay. » oil tightness at the sealing locations intentional displacement. of the tap changer head, the pro- IMPORTANT: The protective relay has to be inserted into the tripping tective relay and the pipe connec- circuit of the circuit breakers s o tions, A CAUTION: that o n response of the protective ¢ sealings at t h e protective housing D o not operate the motor drive relay switched off the transformer of the motor drive, while the tap changer i s un- i s immediately (see Operating In- * proper function of the incorporated. coupled. structions No. 59 for protective electrical heater inside the motor relay RS 2001). drive housing, To remount the motor drive unit follow Make sure that the circuit breakers + the condition of the control devices. the instructions according to sections switching off the transformer operate in the motor drive unit. 9.1 and 9.3. when test button »OFF« of the protective relay has been pressed. IMPORTANT: If the transformer i s Be sure that they energize the trans- A WARNING: filled with oil but stored o r trans- former only after test button »IN After a response o f t h e protective ported without o i l conservator, SERVICE« of the protective relay has relay, do not reset until the tap a by-pass tube must be installed been pressed. changer a n d the transformer have between the interior of the tap been checked. F o r t h i s purpose changer o i l compartment and the withdraw the tap changer insert transformer tank t o equalise the and check it according to our pressure caused b y the expansion A NOTE: Inspection Instructions. of the oil. Check that all stop valves be- Proceed i n detail a c c o r d i n g t o tween o i l conservator a n d tap Operating I n s t r u c t i o n s N o. 5 9 Install this by-pass tube at the tap changer between pipe connections Eo changer are open. for t h e protective relay R S 2001. and Q of the tap changer head. Before returning to operation, make sure that the cause of the For short stand-by periods of 2 to 4 When having energized the trans- trouble has been corrected and weeks without oil conservator, it is former, tap change operations under that t a p changer a n d transformer also sufficient to lower the oil level by load can be performed. The then are free of damage. approx. 5 litres. arising switching gas accumulating Reconnection of the transformer If the transformer is to be completely under the cover of the tap changer without prior checking i s prohibi- emptied, drain also the switching oil of cover will cause minor oil displace- ted a n d c a n l e a d t o severe damage the tap changer completely. ment or escape via the oil conserva- of tap changer and transformer. tor. The interior of the tap changer oil com- partment should be conserved and pro- In case of major faults with tap chan- tected in the same way as the trans- ger or motor drive which cannot be former (e.g. by filling with nitrogen). easily overcome on the spot and in In the case of a longer stand-by case of a response of the protective period, the heater of the motor drive relay, please contact the authorized unit must be connected and put into MR representative, the transformer operation. manufacturer or directly Maschinenfabrik Reinhausen GmbH Technical Service Postfach 12 03 60 D-93025 Regensburg Germany Phone +49-941-4090-0 Telefax +49-941-4090-501 Telex 6 5 8 8 1 12 14. INSPECTIONS The use of an oil filter unit type 51 with If inspections are not carried out by a combined filter insert is obligatory, MR personnel, we request a report to if the operating voltage exceeds 92 kV supplement our inspection data, so IMPORTANT: The tap changing between phases at the tap changer. that, in case of need, recommenda- equipment must he inspected at Filtering of the switching oil allows the tions for the next inspection can be regular intervals t o maintain a high inspection and oil change intervals to given, level o f operating reliability. be extended. Continuous oil filtering The inspection can be carried out by also increases the mechanical life of qualified and MR-trained personnel the selector switch by immediately removing most of the abrasive parti- A WARNING: usually within one day, provided it has been well prepared and organized. cles responsible for mechanical wear. Disregard of the inspection intervals puts at risk the trouble- We strongly recommend to have in- The insulating oils in the transformer free operation of tap changer spections carried out by our Technical are to be monitored by the operator and transformer. Service. This guarantees a profes- according to the relevant standards. sional performance of the inspection and ensures the updating of specific The following standard values for oil testing according to CIGRE report 12-13 components to the latest operational (1982) apply to transformer oil at service temperature: state. If the inspection will not be carried out On-load tap changer Water content®) Dielectric strength**) by MR personnel we recommend to H I 400Y < 40 ppm > 30 kV/2,5 mm request for the necessary spare parts. In this case please indicate the tap H 11400 D < 30 ppm > 40 kV/2,5 mm changer serial number and the number of tap change operations. *) measured according to the Karl Fischer-method based on IEC Publication 814 **) measured according to DIN VDE 0370 Teil 1. The numbers of tap change opera- tions determining the inspection intervals indicated in table I are figures based on experience with use On-load Rated transformer Number of tap change operations of usual oil qualities. tap changer current without MR oil filter with MR oil filter If the number of operations per year is H 111400 Y / D upto 200 A 100 000 150 000 15,000 or higher, w e recommend the u p to 400 A 7 0 000 140 000 use of our stationary oil filter unit type 51 with a paper filter insert (see H 111 400 D-123 u p t o 200 A 7 0 000 140 000 Operating Instructions No. 18). u p to 400 A 5 0 000 1 0 0 000 OLTC H Ill 400 D is recommended to H 11 400 D-145 upto 200A 70 000 1 4 0 000 be equipped with a stationary oil filter upto 400 A 50 000 100 000 unit with a combined filter cartridge, if being in service in tropical or subtropi- Table | Inspections intervals cal areas and exposed to extreme variations in temperature. Regardless of the number of operations, an inspection must be carried out after 6 to 7 years of service. The first inspection of tap changers H l I 400Y/D, H 11 400 D-123, H 111400 D-145 should be carried out after a period of 2 to 3 years of service. 15. APPENDIX On-load tap changer type H l i 400 Y/D-123, installation drawing........... 895 800 On-load tap changer type H Ill 400 D-123, installation drawing.............. 895 741 On-load tap changer type H Ill 400 D-145, installation drawing.............. 895 835 Drilling template for tap changer head 890 183........ccoiieiniccininincrcimnicniceeene On-load tap changer head, dimension drawing......... 895 743, 895 836, 896 029 Supporting flange for bell-type transformer cover..... 896 100, 896 101, 896 102 Lifting traverse, dimension drawing sre.........ccccceveererccenvscereenrsne 896 097 ssecvasmersassas Protective relay RS 2001, dimension drawing 892 608.....ccccccccevevrsesvennersecnnesnaanes Motor drive unit MA 7, dimension drawing. 895 660..........cccccceeeenss ssesessineeraesrinen Motor drive unit M A 9 , dimension drawing trassssanse saiarian 893 381 Bevel gear CD 6400, dimension drawing veeseeur Es 892 916 rear aS sean par ALEeROA ASS ARLES 13  | TRANSFORMER TANK BOTTOM o -33 3% 35,36 ! |. 2 R 8 - 7.6 THICKNESS 23 VERTICAL POSITION OF THROUGH- HOLE ON TAP CHANGER TERMINALS OPTIONAL == 3 : 15 T HII 400 Y 1 3B 11 ~ MOUNTING FLANGE ON TRANSFORMER COVER 12 - FIXING BOLT M12 >——e@ 36 3 GASKET FOR HEAD TAP C H A N G E R 14 — INSPECTION WINDOW FOR POS. INDICATION % © | 15 — THROUGH HOLE 16 MMDIA. — 21 TAP CHANGER HEAD 22 ~ COVER OF TAP CHANGER HEAD 3 0 hi] 8 1 23 - PPE CONNECTION R FOR PROTECTIVE RELAY 2 -PPE CONNECTIONQ FOR RETURN PIPE (WITH OIL FILTER UNIT ONLY) b- Z ~PPECONNECTION S FOR SUCTION PIPE 3a 26q~BLEEDER VALVE OF TAP CHANGER HEAD COVER 0 08 26b- BLEEDER FACILITY FOR TRANSFORMER TANK Z c - BLEEDER SCREW FOR SUCTION PIPE Ub Pe 27 - UPPER GEAR UNIT WITH DRIVE SHAFT 27a 31 - SELECTOR SWITCH OL COMPARTMENT 0 66 32 ~BOTTOM OF OIL COMPARTMENT WITH KEROSENE DRAIN SCREW 32a 33 ~ SELECTOR SWITCH TERMINAL > 34a— OUTPUT TERMINAL OR NEUTRAL TERMINAL 32 34,b~STARPOINT CONNECTION b— 35 - CHANGE OVER SELECTOR TERMINAL “ + ” AND " - * } 36 - CHANGE OVER SELECTOR TERMINAL “ 0 ” 32a M AE NFADRIK On-load tap changer type H Model H Ill 400 Y/D, Uy, < 7 6 KV, installation drawing 895 800:3E EJ] 14  15 33a 26b - - -- PROVIDE SUFFICIENT CLEARENCE 1, 11 — MOUNTING FLANGE ON TRANSFORMER COVER YT TT TRANSFORMER TANK 12 — FIXING BOLT M12 13 — GASKET FOR TAP CHANGER HEAD 1% — INSPECTION WINDOW FOR POS. INDICATION BOTTOM 15 — THROUGH HOLE 16 MM DIA. 21 — TAP CHANGER HEAD 22 - COVER OF TAP CHANGER HEAD 23 —- PIPE CONNECTION R FOR PROTECTIVE RELAY 24 - PIPE CONNECTION Q FOR RETURN PIPE (WITH OIL FILTEI UNIT ONLY) 25 - PIPE CONNECTION S FOR SUCTION PIPE 26a0— BLEEDER VALVE OF TAP CHANGER HEAD COVER 26b— BLEEDER FACILITY FOR TRANSFORMER TANK 26c— BLEEDER SCREW FOR SUCTION PIPE 27 ~ UPPER GEAR UNIT WITH DRIVE SHAFT 27a 33b 28 — GRADING RING 31 — SELECTOR SWITCH OIL COMPARTMENT 32 - BOTTOM OF OIL COMPARTMENT WITH KEROSENE ORAIN SCREW 32a 3 3 a - SELECTOR SWITCH TERMINAL 33b— SELECTOR SWITCH TERMINAL REGULATING RANGE 34 — OUTPUT TERMINAL OR NEUTRAL TERMINAL 35 — CHANGE OVER SELECTOR TERMINAL "+" AND " - “ 36 — CHANGE OVER SELECTOR TERMINAL “ 0 ° = —-35,36 J N KTR" 3 =i 7.6 THICKNESS ¥ VERTICAL POSITION OF THROUGH-HOLE ON TAP CHANGER TERMINALS OPTIONAL MASCHINENFABRIK On-load tap changer type H M REINHAUSEN Model H Iii 400 D, Up, = 123 kV, installation drawing 895 7 4 1 : 2 8 16  =n Mt. / 12 23 1 Shtace a) —— 15 13 44 b— «) 28 28 — i 3 H D@s +olCle |» x 32 PROVIDE SUFFICIENT CLEARENCE 32a 77777. 7/77 TRANSFORMER TANK "n - MOUNTING FLANGE ON TRANSFORMER COVER BOTTOM 12 - FIXING BOLY M 12 13 — GASKET FOR TAP CHANGER HEAD 4% =- INSPECTION WINDOW FOR POS. INDICATION 15 — THROUGH-HOLE 1% MM DIA. 21 —- TAP CHANGER HEAD 22 — COVER OF TAP CHANGER HEAD 23 - PIPE CONNECTION R FOR PROTECTIVE RELAY 2 =- PIPE CONNECTION Q FOR RETURN PIPE (WITH OIL FILTER UNIT ONLY} 25 — PIPE CONNECTION S FOR SUCTION PIPE 2 6 a- BLEEDER VALVE OF TAP CHANGER HEAD COVER 26b- BLEEDER FACILITY FOR TRANSFORMER TANK 2 6 ¢ c— BLEEDER SCREW FOR SUCTION PIPE 27 — UPPER GEAR UNIT WITH DRIVE SHAFT 27a 28 - GRADING RINGS 31 ~ SELECTOR SWITCH O i l COMPARTMENT 32 — BOTTOM OF Ol. COMPARTMENT WITH KEROSENE DRAIN SCREW 32a 3%a- SELECTOR SWITCH TERMINAL Ig 33b~ SELECTOR SWITCH TERMINAL REGULATING RANGE a. J 34 = OUTPUT TERMINAL LBL 3 35 — CHANGE-OVER SELECTOR TERMINAL “ + AND * - * 3 — CHANGE-OVER SELECTOR TERMINAL “ 0 ? " {lated TT 4 - T i E - IN RESISTOR 42 = I N CONTACT TIE~- VERTICAL POSITION OF THROUGH - HOLE ON 43 - CHANG - EOVER SELECTOR TAP CHANGER TERMINALS OPTIONAL 4 - SUPPORTING FLANGE M NO NTIADENCABRIK On-load tap changer type H a ——— Model H Ill 400 D, Uy, = 145 kV, installation drawing 895 835:2E 16  MARKS TO B E POUNDED M CASED RIK On-load tap changer type H Drilling template for tap changer head 890 183:6E 17  140 R322 125.5 120 Co 375 [i Y mn nm 176.5 o i NI 3 3 i Z_ , pen / {ih ————/{ & JL ' 16 THICKNES i NK 4 6 5 E1 = BLEEDING FACILITY FOR TAP CHANGER HEAD 15 E z= BLEEDING FACILITY FOR SPACE UNDER THE HEAD OUTSIDE THE TAP CONNECTING FLANGE CHANGER OIL COMPARTMENT (SAME PIPE CONNECTION AS Q,S,R) FOR Q.S.R Q = CONNECTION FOR OIL RETURN PIPE {ONLY FOR OIL FILTER) CONNECTIONS ORIENTABLE S = CONNECTION FOR SUCTION PIPE THROUGH 360° R = CONNECTION FOR PROTECTIVE RELAY O-RING 44,2-57 2 = EARTH CONNECTION M12. MASCHINENFABRIK On-load tap changer type H REINHAUSEN 895 743:3E Tap changer head for H lil 400 Y/D, U p £ 7 6 kV and H Ill 400 D, Uy, = 123 kV 18  140 R322 255 _ 120 ~~ 176.5 38. #1 19 i Zs 1 Fn gpl 97 - — | ar) — f LN rd — f 1 — ALE RETR 7 \L/ 2 710 ® 740 DETAIL AT Z 226 5 of ad 2 \ A |e CONNECTING FLANGE FOR Q,S.R 16 [ Thickness 0i | p O-RING44,2-57 Eq = BLEEDING FACILITY FOR TAP CHANGER HEAD E2 = BLEEDING FACILITY FOR SPACE UNDER THE HEAD OUTSIDE THE TAP CHANGER OIL COMPARTMENT (SAME PIPE CONNECTION AS Q,S5,R CAN BE USED) {=} = CONNECTION FOR OIL RETURN PIPE CONNECTIONS {ONLY FOR OIL FILTER) ORIENTABLE THROUGH = CONNECTION FOR SUCTION PIPE 350° Jv = CONNECTION FOR PROTECTIVE RELAY Wy = EARTH CONNECTION M 12 M NN ENFARRIK REINHAUSE| On-load tap changer type H. Tap changer head for H I1l 400 D, Up, = 145 kV 895 836:2E 19  140 R322 125.5 120 126.5 k B in Sp iy = I ) i] ~ 3 ~— _ ¢ 710 DETAIL AT Z 226 16 CONNECTING FLANGE FOR QSR BLEEDING FACILITY FOR TAP CHANGER HEAD BLEEDING FACILITY FOR SPACE UNDER THE HEAD OUTSIDE THE TAP CHANGER OIL COMPARTMENT {SAME PIPE CONNECTION AS @, S,R CAN BE USED) CONNECTION FOR OIL RETURN PIPE CONNECTIONS o " (ONLY FOR OIL FILTER) CONNECTION FOR SUCTION PIPE a a E THROUGH an CONNECTION FOR PROTECTIVE RELAY O-RING 44,2-57 = EARTH CONNECTION M 12 = MASCHINENFABRIK On-load tap changer type H M R ARERARSER Tap changer head for H I I 400 D, Uy, = 145 kV, 896 029:1E 20  fuer DEVICE \ , O-RING 44,2-57 N LEVEL TRAVERSE {REPRESENTATION TURNED) 165 £77 } 8 98 A 1 {/ AR or L © + WITH 123KV ONLY $620 9750 SUPPORTING FLANGE 24 py & gs. y ] [¥ | \ — + 4 & LEVEL | TRAVERSE © 4 x Es = ; 2} Z = GUIDING PIN © & FURTHER DIMENSIONS OF TAP CHANGER HEAD SEE DWG. 895 743: LEVEL TRAVERSE SEE DWG. 896 097: MASCHINENFABRIK On-load tap changer type H MR Ens Special design for mounting on bell-type cover, 896 100:2E for H l l 400 Y/D, Um £ 7 6 kV and H IIE 400 D, Up, = 123 kV 21  LIFTING DEVICE O-RING 442-57 } 30 i H E R8 | T PR WING SHO ER SELECTOR TURNED TO SECTIONAL #750 PLANE Z = GUIDING PIN FURTHER DIMENSIONS OF TAP CHANGER HEAD SEE DWG. 895 836: LEVEL TRAVERSE SEE DWG. 896 097: MASCHINENFABRIK On-load tap changer type H REINHAUSEN 896 101:3E Model H l I 400 D, Up, = 145 kV, with change-over selector, standard design, also for installation into bell-type tank 22  LIFTING DEVICE O-RING 44,2-57 LEVEL TRAVERSE (REPRESENTATION TURNED) 0 7 \ N , TT Mex30 Lo. i | 0-RING a 1 % ZT, ol +3 ’ SUPPORTING | 5 FLANGE ya = / DRAWING SHOWS CHANGE OVER 9620 SELECTOR TURNED TO SECTIONAL 8750 PLANE Z = GUIDING PIN FURTHER DIMENSIONS OF TAP CHANGER HEAD SEE DWG. 896 029: LEVEL TRAVERSE SEE DWG. 896 087: M A CHINENFABRIK On-load tap change r type H Model H Ill 400 D, Uy, = 145 kV, with tie-in resistors, 896 102:3E EE — standard design, also for installation into beli-type tank  1 \ alan 8 ] Bw (7 ai Am )a 4675 L __9 S Be —~ FPN H 3 Bind giond plates fo 407— — — — — — =] | 1 ay, ' la GN |e ana tn an - t MR Rar" Motor drive unit MA 7 895 660:9E Attachment and dimensions (lock with clamp lever). ERE A 26  289 302——————»~y 435. ee = / — E n gsomviaiz - iE= ft SN = R 8C N P P :% LY DT MR 3 8 [EEE L g £ ee | | fae oO = © (me) § :b o oLl | b| EE \& Blind glandpiste ~ 63,5 j e t —154 — i = =n FF on | OT oo ma g== 5 3 =m 31 | = EE y hij let —— 319 o p e n e byd90° ——mwi 687 opened by 135°————————————i 854 o p e n eby d 180° ___319 | 1 { n { Fe Apekamn p e t e hab c h i forcole any MASCHINENFABRIK Motor drive unit MA 9 M REINHAUSEN Attachment a n d dimensions 893 381:9E 27  892916 6E N 061 4 i gr of leq yum ubissp 103 g g = e ubisap pJiepue)s 10} §0Z = o | 3 0c He—GG — > I— Le 2 f — i — De J A o / : Dimension drawing Bevel gearing 0> LS © /E iid 1| ). © Fe) y _._.. _____.o o S L D \/ ] 0 £ in ) { G99 — de G'|9—> qc 060 —— —L — MR s s o eel » 28  REINHAUSEN GERMANY Maschinenfabrik Reinhausen GmbH Postfach 12 03 60 D-93025 Regensburg Phone: (+49) 9 4 1 / 4 0 90-0 Fax: (+49) 9 4 1 / 4 0 90-111 Telex: 65881 B A 108/01 e n - 0395/1000 108/01/01/0 F0002100 Printed in Germany