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6.3 Filling at Atmospheric Pressure

1. Open the conservator valve, if any.
2. Dismantle the breathing device on the conservator for the on-load tap-changer.
3. Pump oil into the diverter switch housing via the oil valve (connection dimensions,

see the dimension drawing for the on-load tap-changer). Continue until the conser-

vator is filled to the correct level at the actual temperature. See even section 1.5.

4. Shut the oil valve and disconnect the pump.
5. Remount the breathing device. Make sure the connection to the breathing device is

properly sealed.

CAUTION

Do not energize the transformer earlier than three hours after oil filling in

atmospheric pressure. This waiting period is needed to allow air bubbles to

disappear.

6.4 Filling under Vacuum

Filling under vacuum is not necessary but may be carried out with some of the

following procedures. After filling under vacuum, no standing time is needed. The

methods below ensure that no permitted pressure differencies are exceeded.

6Oil Filling

Oil

OLTC

Fig. 46. Oil filling at vacuum

Fig. 45.

Stud M10

Transformer

Vacuum

Pipe connection

Connection flanges for the oil-

conservator. The pressure relay

can have the alternative placement

Ø 5.7

O-ring

Ø 20

Ø 7

Ø 44.2

Flange for gas

operated relay

(transformer tank)

TC_00155

Cover with air

release valve

Summary of Contents for UCC Series

Page 1: ...On load tap changers types UCC and UCD with motor drive mechanism type BUE Installation and Commissioning Guide 1ZSE 5492 117 en Rev 5 2003 03 30 ...

Page 2: ...This document must not be copied without our written permission and the contents thereof must not be imparted to a third party nor be used for any unauthorized purpose Contravention will be prosecuted ...

Page 3: ...disregarded could cause damage to the equipment NOTE A NOTE provides additional information to assist in carrying out the work described Safety Precautions WARNING Unused transformer oil is slightly harmful Fumes from unused warm oil may irritate the respiratory organs and the eyes After long and repeated contact with transformer oil skin becomes very dry Used on load tap changer oil from diverter...

Page 4: ...ut work on the on load tap changer put the LOCAL REMOTE switch in the motor drive mechanism to position 0 It is also recommended to shut the door of the motor drive mechanism and pad lock it when work is carried out on the on load tap changer The key should be kept by the operator This is done to avoid unexpected start of the motor drive mechanism WARNING Before starting any work inside the motor ...

Page 5: ...e clean and undamaged Diametrically opposed bolts in sealing joints must be tightened alternately several times beginning with a low tightening torque and finally with the recommended tightening torque as described in section 1 8 Tightening Torque in this guide During Oil Filling WARNING When oil that has been used in a diverter switch housing is pumped out conducting tubes and hoses that are eart...

Page 6: ...en fire hot surfaces or sparks occur in the immediate surroundings of the breathing devices WARNING If a failure in power supply occurs during operation the operation will be completed when the power returns WARNING The hand crank must not be inserted during electrical operation WARNING If the on load tap changer is not in its exact position and the hand crank is pulled out the motor drive mechani...

Page 7: ...__________________ 34 3 2 2 Mounting when the Transformer Ratio Measurement is carried out after Drying _________________________________ 36 3 2 3 Mounting on Transformer Cover ____________________________ 37 3 3 Connection to Terminals __________________________________ 40 3 4 Transformer Ratio Measurement ____________________________ 42 3 4 1 Transformer Ratio Measurement before Drying _________...

Page 8: ...1 2 Conservatordismounted___________________________________ 69 8 2 2 Transformer drained _____________________________________ 69 8 2 2 1 Conservatormounted _____________________________________ 70 8 2 2 2 Conservatordismounted___________________________________ 70 9 Commissioning _____________________________ 70 9 1 Connection to the Oil Conservator ___________________________ 72 9 2 Mounting th...

Page 9: ...ings to the on load tap changer before drying and without having the transformer cover mounted The transformer cover is then lowered onto the tank and the on load tap changer is lifted and bolted to the cover Please use the appropriate instruction for cover mounting or yoke mounting in chapter 3 At cover mounting the diverter switch housing is installed on the transformer cover before joining with...

Page 10: ...III Example UCDRE650 1000 III Type of switching L Linear R Plus Minus D Coarse Fine Type of connection N Three phase star point one unit E Single phase oneunit Impulse withstand voltage to earth Maximumratedthrough current Tap selector size 1 Introduction 10 ...

Page 11: ...l No in the bottom of the diverter switch see Fig 29 Diverter switch housing Tap selector size III Tap selector size G Tap selector size IV Fig 1 Serial No Serial No Shielding ring not in combination with tap selector size G Serial No ...

Page 12: ...ielding rings and caps only for UCC UCD with impulse withstand voltage to earth exceeding 380 kV Hand crank inside the cover Vertical drive shafts and protective tubes Bevel gear TC_00024 TC_00031 TC_00029 TC_00031 Fig 2b Three single phase units with three motor drive mechanism for three phase full insulation 2000 A Rating plate 1 The two phase unit should be connected in a corner of the delta wh...

Page 13: ...and crank for operating the on load tap changer 3 4 on the bevel gear can be ordered from ABB under further requirements on the ordering data sheet Art No LL117 016 M n Hack saw only for installation 5 n File 5 n Folding ruler 5 n Air pump with hose pressure gauge 0 250 kPa and connection with internal thread R 1 8 5 3 n Tool for opening of oil drum 6 n Container 50 litres 6 n Small oil pump with ...

Page 14: ...Circuit diagram for the motor drive mechanism 7 2 n Oil filter in case of common conservator for both the 5 5 transformer and the on load tap changer can be ordered from ABB 1 4 Oil The oil quality should be of Class II according to IEC publication 296 Table 1 Weight of oil in kg Type designation Oil weight 1 UCC 380 UCD 380 700 UCC 650 UCD 650 760 UCC 1050 UCD 1050 860 1 The oil for the conservat...

Page 15: ...evice that does not allow moist air into the conservator and that allows the gas from the arcs to disappear The conservator should also be equipped with an oil level indicator and an alarm contact for low oil level is recommended 1 6 Oil Filter Unit for Continuous Oil Filtration If the on load tap changer should have an oil filter unit for continuous oil filtration from ABB installation and commis...

Page 16: ... tap changers On load tap changer Approx weight in kg Type designation Tap changer Required Total without oil 1 oil UCD N III 380 1000 900 700 1600 650 1000 940 760 1700 1050 1000 960 860 1820 UCD E III 380 1000 840 700 1540 380 1800 870 700 1570 380 2400 900 700 1600 650 1000 880 760 1640 650 1800 910 760 1670 650 2400 940 760 1700 1050 1000 900 860 1760 1050 1800 930 860 1790 1050 2400 960 860 1...

Page 17: ... the on load tap changer is not possible a damage report should be sent to the insurance company It is also recommended that photographs are taken of the damaged details Mark the photos with ABB s reference number and the serial number of the on load tap changer and send them to ABB for comments 3 Check that the parts delivered type designations and the serial number agrees with the delivery docum...

Page 18: ...ch housing and the tap selector are designed to be lifted in the lifting eyes see Fig 3 WARNING To put down the complete on load tap changer to stand on the floor without any support on the top of the on load tap changer means a risk for tilting with risk for injuries to people and damage to the equipment Diverter switch housing Tap selector IV TC_00190 TC_00114 Tap selector III TC_00185 Tap selec...

Page 19: ...ctor and on the diverter switch housing 2 Fit the gasket into the on load tap changer flange on the transformer cover see Fig 5 This gasket is not included in the delivery 3 When the impulse withstand voltage to earth exceeds 380 kV the on load tap changer is provided with shielding rings Before mounting the diverter switch housing on the transformer cover two shielding rings must be dismantled se...

Page 20: ...ng on the tie in resistor It must be hanging for instance in a traverse WARNING To put down the on load tap changer to stand on the floor with the tie in resistor mounted means a great risk for tilting the on load tap changer with risk for injuries to people and damage of the equipment 7b In case the on load tap changer is equipped with a tie in resistor switch the switch is mounted under the tap ...

Page 21: ... contains moving parts Be cautious 11 Connect the supplied conductors between the diverter switch housing and tap selector see Fig 7 The conductor ends and their connecting points have the same markings Fasten the conductors with cleats see Fig 7 A A The number of conductors is varying depending on rated through current and the type of connection 12 If the impulse withstand voltage to earth exceed...

Page 22: ...g X contacts Conductors Conductor B Shielding cap Conductor Insulating paper TC_00169 Locking nut Spring washer Socket screw M12x40 Conductors Connection point on the tap selector Cleat Insulating nut M16 Insulating screw M16 Conductors 22 3 mm 100 mm Plain washers 14x30x2 5 A A B B Cleat TC_00202 Slot in the large gear wheel of the diverter switch housing Driving pin of the tap selector TC_00111 ...

Page 23: ...osition for joining to the diverter switch housing Lift in the lifting eyes as shown in Fig 3 7a In case the on load tap changer is equipped with a tie in resistor for mounting under the tap selector the tie in resistor is mounted after joining the tap selector to the diverter switch housing After mounting the tie in resistor the on load tap changer must not be put down standing on the tie in resi...

Page 24: ... switch housing Tighten the screws WARNING The diverter switch housing and the tap selector contains moving parts Be cautious 11 Connect the supplied conductors between the diverter switch housing and tap selector see Fig 9 The conductor ends and their connecting points have the same markings Fasten the conductors with cleats see Fig 9 A A The number of conductors is varying depending on the rated...

Page 25: ...or Spring washer Socket screw M12 x 45 Locking nut M12 B B TC_00095 Plain washer 13x34x3 Spring washer Socket screw M8 x 25 4x Locking nut M8 TC_00095 Detail D 3 Installation in the Transformer Socket screw M10x40 4x Plain washer 14x30x2 5 Support Spring washer 25 A A Lower shielding ring To be dismantled Upper shielding ring To be dismantled Tap selector Current collector Fig 9 UCD N star point t...

Page 26: ...awing The studs on the flange on the transformer cover shall fit into the flange of the diverter switch housing Mount thirty washers and M16 nuts see Fig 5 Tighten the nuts 5 If the impulse withstand voltage to earth exceeds 380 kV mount the dismantled shielding ring on the diverter switch housing see Fig 17 6 Put the tap selector in position for joining to the diverter switch housing Lift in the ...

Page 27: ...ch housing see Fig 19 10 Insert six M12x50 screws and washers see Fig 18 through the selector upper part to the six supports of the diverter switch housing Tighten the screws WARNING The diverter switch housing and the tap selector contains moving parts Be cautious 11 If the on load tap changer should be equipped with tie in resistors the tie in resistors are integrated with a tie in resistor swit...

Page 28: ...n the bottom of the tap selector see Fig 13 3 Installation in the Transformer 28 Remove screws Locking device Shaft TC_00172 Potential Switch Tap Selector Fig 13 Potential Switch Pin Slot Potential connection Lip Dismount the screw TC_00173 Washer ...

Page 29: ...shaft must be in position to fit in the slot of the potential switch shaft The lip in the potential switch cylinder shall fit in the cut of the tap selector see Fig 14 Fig 15 3 Installation in the Transformer 29 Potential connection to the potential switch Insulating nut Insulating bolt Potential connection to the current collector TC_00177 Cut Lip Screw Washers TC_00174 Fig 14 ...

Page 30: ...r counter clock wise so the brackets of the potential switch enter the center supports of the tap selector see Fig 16 Mount the insulating bolts 3 pcs and nuts and lock them according to the same principle used for insulating bolted joints in the transformer active part PVA glue or similar 30 Fig 16 g Electrical connection is done under section 3 3 Bracket of the potential switch Insulating bolt I...

Page 31: ... switch housing Spacer Al Ø40 The tap selector can be delivered with mechanical end position barrier Fig 17 UCD N star point type Cleat TC_00117 X contacts Cleat B B Fig 18 A A Current collector Shielding ring to be dismantled Shielding ring not to be dismantled Diverter switch housing C Plain washer 13x34x3 Socket screw M12 x 50 6x Spring washer Conductor Shielding cap Insulating screws M16x130 a...

Page 32: ...ying depending on the rated through current and the type of connection 13 If the impulse withstand voltage to earth exceeds 380 kV insulate the connections on the tap selector by winding paper around them to a thickness of approximately 3 mm see Fig 7 B B The paper shall be of the same quality as used for insulation of conductors within the active part of the transformer 14 Continue with section 3...

Page 33: ...ing pins used on the yoke fork should be insulated with bushings in order to prevent circulation current in the yoke fork when the transformer is energized The mounting of the on load tap changer on the yoke fork can be carried out by two alternative methods depending on when the transformer ratio measurement is carried out Transformer ratio measurement before drying process see section 3 2 1 Tran...

Page 34: ...ition for mounting the outer shaft system see transformer drawings Insert the supplied guiding pins DS 7 and insulating bushings not included in the delivery in the lower flange see Fig 21 The guiding pin shall be secured by centre punch marks in the pins see Fig 21 Insulating bushing not included see note page 33 Guiding pin DS 7 outer dia 12 mm Diverter switch housing Lower flange Yoke fork TC_0...

Page 35: ...p after approximately 6 turns see Fig 24 Remount the dismantled plug 7 Dismantle the diverter switch by carefully lifting it straight out of the diverter switch housing by its lifting eye see Fig 23 Store the diverter switch in a dry and dustfree place 8 Remove the oil draining tube by hand or by means of a pipe wrench using a cloth between the tube and the pipe wrench to protect the tube Store th...

Page 36: ... 1 1 steps 1 6 13 UCD with tap selector III section 3 1 2 steps 1 6 13 UCD with tap selector G section 3 1 3 steps 1 6 13 2 Follow instructions according to section 3 2 1 steps 5 12 3 Apply the lifting equipment LL330 016 D in position according to Fig 25 NOTE The lifting equipment must be tilted when applying 4 Lift the on load tap changer onto the yoke fork use the lifting equipment according to...

Page 37: ...E Do not insert the studs for the upper flange in the transformer cover flange This is carried out in step 8 2 Remove the locking device DS 4 from the driving shaft see Fig 26 CAUTION Be careful not to drop the locking device and the screw CAUTION The driving shaft must not be rotated 3 Place the O ring in its groove in the lower flange 37 Lifting equipment Yoke fork On load tap changer TC_00122 3...

Page 38: ... Fig 28 Tightening the nuts alternately until fully home Retighten all nuts with 24 5 Nm 7 Place the O ring of the bevel gear unit in its groove in the upper flange see Fig 29 Remount the bevel gear unit in the position it had before dismantling make sure the pin in the bottom of the gearbox fits into the hole in the top section and make sure that the pin in the vertical shaft end fits into the dr...

Page 39: ...he nuts 9 Mount the oil draining tube see Fig 28 If a pipe wrench is used there must be cloth protection between the wrench and the tube 10 Remove the plug at the end of the T coupling see Fig 30 slide down the bottom valve key and close it by turning it clockwise approximately 6 turns Tighten with 40 Nm Remount the plug 11 Install the diverter switch according to section 4 3 Fig 28 Lower flange Y...

Page 40: ...o be connected together on the tap selector terminals in order to avoid circulation currents through the tap selector contacts see Fig 31 Connection Conductors from the active part of the transformer Tap selector Conductors from the diverter switch Connection Fig 31 If the impulse withstand voltage to earth exceeds 380 kV the conductor connections on the tap selector shall be insulated by winding ...

Page 41: ... 33 making the conductors mounted at correct final height The wooden blocks must be removed before mounting the on load tap changer on the transformer cover Lower flange Inserts Yoke fork beam TC_00132 Fig 33 CAUTION It is recommended that the distance between the cylinders or the bars of the tap selector and any conductor is at least 50 mm The transformer manufacturer is responsible for keeping s...

Page 42: ...ugh the whole operating range both in lower and raise direction when carrying out ratio measurement CAUTION Before process the on load tap changer is allowed to be operated maximum three times through the regulating range unless it is not immersed After process the on load tap changer has to be immersed in oil before operating CAUTION The end positions must not be overrun during ratio measurement ...

Page 43: ...nd crank will be higher 3 After the measurement the on load tap changer must be operated in the direction and to the position given in the single phase diagram as the delivery position The right position designation should be shown in the window in the position indicator in the bevel gear of the on load tap changer and the window should face the red point in the bevel gear housing exactly see Fig ...

Page 44: ... bottom valve proceed as follows see Fig 24 a Remove the plug on top of the oil draining tube see Fig 24 b Use the bottom valve key DS16 through the oil draining tube see Fig 24 c Turn the valve anticlockwise to its stop approximately 6 turns d Remount the plug e Remove the O ring in the lower flange for mounting on active part only before process 4 2 Observations after Processing CAUTION To avoid...

Page 45: ...that fit against the guiding bars in the diverter switch housing see Figs 34 and 35 Rotate the diverter switch so the widest slot is aligned with the widest guiding bar see Figs 34 and 35 When the diverter switch is lowered check visually that its plug in contacts are aligned with the contacts in the cylinder wall The top part of the diverter switch lifting device should be at least 1 mm under the...

Page 46: ...4 Drying 46 Serial number Driving pin Lifting device Shielding ring not on 380 kV Plug in contacts TC_00128 Guiding pins Plug in contacts Lifting eye Guiding slots Tie rod Springs Fig 34 ...

Page 47: ...4 Drying 47 Notch for the driving pin Holes for guiding pins TC_00123 Coupling disc Guiding bars TC_00068 Lifting device upper part of the diverter switch Upper flange Min 1 mm Fig 36 Fig 35 ...

Page 48: ...4 Drying 48 TC_00062 O ring Hexagon bolt M12x40 30x plain washer 13x24x2 5 Top cover Transformer cover Yoke fork beam when yoke mounted Top cover TC_00132 Fig 37 Fig 38 ...

Page 49: ...hin 1 mm If adjustment is needed shims should be used 2 Install the bevel gear SA 21 on the edge of the transformer cover see Fig 40 3 Check that the position indicator in the motor drive mechanism shows the same position as the indicator inside the bevel gear of the on load tap changer see Fig 39 WARNING Do not energize the transformer before the on load tap changer and the motor drivemechanismar...

Page 50: ...Fig 39 Position alignment for UCC UCD with motor drive mechanism type BUE Transformer TC_00203 Position indicator Adjustment nuts Brake disc Brake assembly The same indicated tap position Red mark Exact position Tolerances TC_00261 ...

Page 51: ...rfaces of the bevel gears NOTE The multihole couplings should be greased The inclination of the shaft the square tube must not be more than 4o 70mm for every 1000 mm shaft length NOTE The tubes around shafts and couplings are for protection CAUTION Make sure that all locking devices on the bevel gear of the on load tap changer and in the motor drive are mounted and the on load tap changer and the ...

Page 52: ...10 SA19 Washer SA20 O ring SA21 Bevel gear SA22 Horizontal square shaft SA23 Horizontal protective tube SA24 Horizontal protective tube SA25 Information plate SA25 52 Bevel gear on the Diverter switch housing SA10 SA25 SA22 SA24 SA23 SA25 SA17 SA18 SA19 SA10 SA11 SA12 SA13 Vertical drive shaft Horizontal drive shaft Motor drive mechanism TC_00146 SA11 SA12 SA13 SA20 SA21 SA10 SA11 SA12 SA13 TC_001...

Page 53: ...ghten the two screws A see Fig 41h first and then the other Put on the two protective tubes SA15 and SA16 the greater diameter upmost and two hose clips SA10 6 See Fig 41c Connect the square shaft with the mounted coupling halves to the shaft of the bevel gear Mount two coupling halves SA11 to the other end of the square shaft and the shaft of the motor drive mechanism Push the shaft to the bottom...

Page 54: ...Fig 41c Fig 41d Fig 41a SA21 Fig 41b SA11 SA14 SA15 SA16 SA10 K2 Square shaft A SA12 SA13 SA11 A Fig 41g Fig 41h TC_00147 Fig 41f SA10 SA15 Min 3 max 5 mm TC_00149 LB2 54 Square shaft SA11 Max 3 mm Driving pin TC_00148 Fig 41e TC_00170 TC_00147 ...

Page 55: ...ubes shall overlap each other at least 300 mm Dismounting and inspection of the couplings should be possible when one of the tubes is pushed into the other 4 Fit two coupling halves SA11 on one end of the square shaft with six screws SA12 and washers SA13 Push the shaft to the bottom of the fitting in the coupling halves Tighten the two screws A first and then the others see Fig 41h Put on the two...

Page 56: ...anism and on load tap changer are in the same position when the position indicators in both of them show the same position see Fig 39 The motor drive mechanism is in exact position since section 5 2 has been carried out The on load tap changer is in exact position when the window where the position is read in the bevel gear is facing the red point in the gear box housing exactly see Fig 39 If the ...

Page 57: ... downwards Apply the self adhesive information plates SA25 around the tubes on about the middle of the tube length WARNING The bevel gear contains moving gears Be cautious 5 2 3 Before Operation 1 Check again that the on load tap changer and the motor drive mechanism are in the same position 2 Remove the locking device of the motor drive mechanism see Fig 43 TC_00148 TC_00151 Locking device Fig 43...

Page 58: ...he pressure relay can easily be tested by applying air pressure by means of a pump to the test tap on the valve and the handle can be pad locked in the service position CAUTION The pressure relay is a calibrated monitoring instrument It must be handled with care and protected against careless handling or any kind of mechanical damage Do not open the package of the pressure relay until you are abou...

Page 59: ... and check against the pressure stated on the information plate Max permitted deviation is 10 5 Check that the alarm signal disappears when the pressure is lowered 6 After finishing the check turn back the valve handle to service position 5 4 Assembly of Accessories All details which have been removed for the transport are specified on the packing list The openings on the on load tap changer are s...

Page 60: ...for connection to the oil conservator Make sure the O ring is in place on the flange and connect the pipe to the oil conservator Tighten the nuts CAUTION In case where the conservator is common for the transformer and the on load tap changer an oil filter must be placed in the pipe between the on load tap changer and the conservator Oil filter with housing can be ordered from ABB 5 Final Assembly ...

Page 61: ...l filling a gas cushion should remain on the top of the oil in the diverter switch housing The connection to the oil conservator is designed to automatically give a gas cushion when filling at atmospheric pressure When filling under vacuum a certain amount of oil has to be drained in order to obtain the gas cushion NOTE The oil dissolves gases especially if degassed oil is used If the number of op...

Page 62: ...CAUTION Do not energize the transformer earlier than three hours after oil filling in atmospheric pressure This waiting period is needed to allow air bubbles to disappear 6 4 Filling under Vacuum Filling under vacuum is not necessary but may be carried out with some of the following procedures After filling under vacuum no standing time is needed The methods below ensure that no permitted pressure...

Page 63: ...n between the transformer and the on load tap changer by closing both the valves in the connection 7 Remove the connection tube between the valves mounted under point 2 8 Restore the gas cushion in the diverter switch housing according to section 6 5 1 Restoring the Gas Cushion procedure point 2 6 in this guide 9 Remove the oil valve on the flange for the conservator and remount the oil filter if ...

Page 64: ...ushion has been solved in the oil and has to be restored The procedure below is used for on load tap changers without oil filter unit for continuous oil filtration In case the on load tap changer is equipped with an oil filter unit for continuous oil filtration from ABB and it is installed according to our recommendations follow the instructions in Oil filter unit for on load tap changers manual f...

Page 65: ...ut side of the pump to the oil valve 8 Open the oil valve 9 Open the valve in the tube to the conservator 10 Pump the earlier drained 45 litres of oil back into the diverter switch housing 11 Close the oil valve and disconnect the pump 12 The level in the oil conservator and the gas cushion are now restored CAUTION Avoid to do the restoring in damp weather since moisture will get into the diverter...

Page 66: ...hanism as shown by the circuit diagram supplied with the on load tap changer Operate the motor drive mechanism by means of the hand crank to a position in the middle of the range but not in a through position a position with a letter in Turn the control selector switch to position LOCAL Then give an impulse for RAISE operation If the phase sequence is wrong three phase supply the motor drive mecha...

Page 67: ... flag is positioned in the middle Operate the on load tap changer electrically to the other end position and repeat the test procedure above WARNING The transformer should in no case be energized with an end stop out of order 7 3 Electrical Tests on Transformer Acceptance tests on the transformer or commissioning can now be performed 7 4 After Energizing WARNING Before any work is carried out on t...

Page 68: ...h one of the protective tubes into the other Loosen the screws holding the coupling halves in one end of the shaft and detach them Detach the horizontal shaft Mark the details Remount the locking device on the bevel gear of the diverter switch housing see Fig 42a 2 If the vertical shaft should be dismantled See Fig 40 Loosen the hose clips holding the protective tubes to the bevel gear and Motor D...

Page 69: ...lled with oil the on load tap changer should also be transported filled with oil 8 2 1 1 Conservator mounted The diverter switch housing should be filled to normal operating level and the valve to the conservator should be open 8 2 1 2 Conservator dismounted The oil level of the diverter switch housing should be lowered to 150 mm below the upper edge of the housing When the conservator is removed ...

Page 70: ...d to the oil valve Open the air release valve see Fig 47 if necessary Seal the diverter switch housing against the ambient air by mounting covers with gaskets and shut all valves 9 Commissioning This chapter describes tasks to be carried out on the on load tap changer when the transformer is being installed and tested on site CAUTION The motor drive mechanism must be protected against condensation...

Page 71: ...afts The pressure relay is usually delivered in a separate package and installed at commissioning Depending on the transport requirements the transformer may be delivered with the motor drive mechanism and drive shaft system mounted or not mounted The on load tap changer may be delivered filled with oil or without oil Please use the relevant parts of this manual to carry out commissioning For info...

Page 72: ...gs and alignments even if the shaft system has been set up in the transformer factory 9 2 1 Mounting of the Motor Drive Mechanism See Fig 39 Proceed as follows 1 Mount the motor drive mechanism onto the transformer The mounting holes on the transformer should be levelled within 1 mm If adjustment is needed shims should be used 2 Install the bevel gear on the edge of the transformer cover 3 Check t...

Page 73: ...g to Fig 39 The red mark on the brake disc facing the red mark on the brake assembly If not loosen the locking device and adjust it to its exact position Remount the locking device 9 2 4 Mounting of the Vertical Drive Shaft 1 Mount the bevel gear SA21 on the transformer with O ring SA20 clamps SA17 screws and washers see Figs 49b and 49d 2 Put the square shaft SA14 with protective tubes SA15 and S...

Page 74: ...C_00156 SA18 SA19 SA17 Fixing flange of the bevel gear 9 Commissioning SA18 SA19 SA21 SA20 SA11 SA16 SA10 SA15 Driving pin SA17 Motor Drive Mechanism Fig 49e Fig 49d SA10 SA10 SA15 SA16 SA14 SA10 SA15 Min 3 max 5 mm TC_00149 TC_00156 74 ...

Page 75: ... that the shaft not can be moved more than 2 mm in axial direction axial play Tighten the screws A first and thereafter the other see Fig 50d 4 The motor drive mechanism and the on load tap changer should have the same indicated tap position and be in their exact positions The motor drive mechanism and on load tap changer are in the same position when the position indicators in both of them show t...

Page 76: ...rs Be cautious NOTE If the driving pin in the spherical end of the coupling does not fit in the slot in the coupling halves SA11 loosen the M8 screws and turn the multihole coupling just as much as needed to fit the driving pin into the slot in the coupling CAUTION Do not rotate the bevel gear shaft The exact position will then be lost Fit the screws to the holes that are aligned with the holes in...

Page 77: ...51 NOTE The door of the motor drive mechanism cabinet can be locked with a padlock not included in the delivery Fig 51 Locking device of motor drive mechanism 9 3 Pressure Relay Follow appropriate parts of section 5 3 9 4 Accessories Remount all other accessories if any that have been dismounted for the transport Follow appropriate parts of section 5 4 9 5 Oil Filling Follow appropriate parts of c...

Page 78: ... the motor at the actual voltage CAUTION If the protective motor switch has not released within 60 seconds disconnect the power and check the settings with the rating plate of the motor Adjust if necessary and check again when the motor has cooled down WARNING The motor power voltage is dangerous Protective motor switches for DC motors and for single phase AC motors are not tested 9 6 2 Disc Brake...

Page 79: ...n the door is closed 9 6 6 Heater Switch off all power supplies and feel with a finger that the heater has been warmed up during earlier tests Switch on the power afterwards 9 7 Putting into Operation Put the LOCAL REMOTE switch to REMOTE Reset the drag hands Make sure that no tools or foreign objects are left in the motor drive cabinet or on the transformer cover Close the door to the motor drive...

Page 80: ...17 en Rev 5 2003 03 30 ABB Power Technology Products AB Components Visiting address Lyviksvägen 10 Postal address SE 771 80 Ludvika SWEDEN Tel 46 240 78 20 00 Fax 46 240 121 57 E mail sales se abb com www abb com ...

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