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ABB UBB Series Скачать руководство пользователя страница 5

During oil filling

WARNING

When oil that has been used in a selector switch housing is pumped out, conducting

tubes and hoses that are earthed should be used to avoid the risk of explosion due to

the gases produced by the arcs during service.

CAUTION

Do not fill oil into the on-load tap-changer if the transformer tank is under vacuum and the

on-load tap-changer is not.

Do not fill oil into the transformer tank if the on-load tap-changer is under vacuum and the

transformer tank is not.

Leave a gas cushion on top of the oil in the on-load tap-changer.

After oil filling

CAUTION

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

-

sure. This waiting period is needed to allow airbubbles to disappear.

NOTE: Check the oil level one month after filling. It is usual for the oil level of the oil

conservator to fall due to gas absorption in the oil from the gas cushion in the on-load
tap-changer, if the on-load tap-changer is not operated. Restore the gas cushion and
the oil level according to section 7.5.

During service

WARNING

Small amounts of explosive gases will always come out from the breathing devices
(dehydrating breather or one-way breather). Make sure that no open fire, hot surfaces

or sparks occur in the immediate surroundings of the breathing devices.

If a failure in power supply occurs during operation, the operation will be completed
when the power returns.

The hand crank must not be inserted during electrical operation.

If the on-load tap-changer is not in its exact position and the hand crank is pulled out,
the motor-drive mechanism will start and go to the exact position if the power supply

is on.

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 about to install it on the on-load tap-changer.

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Содержание UBB Series

Страница 1: ...On load tap changers type UBB Installation and commissioning guide 1ZSE 5492 118 en Rev 4 ...

Страница 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 ...

Страница 3: ...es additional information to assist in carrying out the work de scribed 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 switch housings and selector switch housings contains harmful su...

Страница 4: ...xiliary power must be switched off N B The motor contactors and heating element may be energized from separate sources During drying of the transformer CAUTION During drying with hot air and vacuum the maximum permitted pressure difference for the on load tap changer is 100 kPa at a maximum permitted temperature of 135 C 275 F During drying by the vapour phase process the cover of the selector swi...

Страница 5: ...absorption in the oil from the gas cushion in the on load tap changer if the on load tap changer is not operated Restore the gas cushion and the oil level according to section 7 5 During service WARNING Small amounts of explosive gases will always come out from the breathing devices dehydrating breather or one way breather Make sure that no open fire hot surfaces or sparks occur in the immediate s...

Страница 6: ......

Страница 7: ...______________24 4 2 Observations after processing_____________________________________24 5 Final assembly______________________________________________________25 5 1 Mounting of the motor drive mechanism_ ___________________________25 5 2 Mounting of accessories__________________________________________28 5 3 Mounting of external drive shafts___________________________________29 5 3 1 Mounting of...

Страница 8: ...___________________________46 10 2 Oil filling_______________________________________________________46 10 3 Electrical connection and testing__________________________________46 10 3 1 Motor protection_ ___________________________________________46 10 3 2 Disc brake_________________________________________________47 10 3 3 Counter___________________________________________________47 10 3 4 Positi...

Страница 9: ...ying 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 The motor drive mechanism and bevel gear are fitted to the transformer tank and the drive shafts are fitted to complete the assembly of motor drive mechanism...

Страница 10: ...ctor switch Cylinder Flange Bevel gear Oil valve Selector switch shaft Fig 2 General arrangement of on load tap changer type UB Transition resistor Current collector terminal Shielding rings Indicator window Air release valve to on load tap changer Connection to oil conservator Pressure relay Air release valve to transformer tank Top cover 1 Introduction ...

Страница 11: ...ling in this guide 1 4 Oil conservator The on load tap changer has to be connected to an oil conservator ABB recommends the use of a separate conservator for the on load tap changer with both oil and air side sepa rated from the main conservator of the transformer The volume of the conservator should be such that there is oil left in the conservator even at the lowest oil temperature expected and ...

Страница 12: ...kg Motor drive mechanism BUL weight 75 kg Drive shaft system weight about 10 kg The weights of the motor drive mechanism and drive shaft system are not included in the weights given in table 1 Table 1 Weights of on load tap changer type UBB On load tap changer Type designation Approx weight in kg Tap changer without oil Required oil Total weight UBBLN XXX YYY 140 100 240 UBBRN XXX YYY UBBDN XXX YY...

Страница 13: ...tos 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 agree with the delivery documents e g the packing list or ABB s ordering acknowledgement The se rial number is stamped on the rating plate and on the on load tap c...

Страница 14: ...ot included in the on load tap changer delivery 2 Check that the on load tap changer flange is positioned in the right way in rotational relation to the transformer cover 3 Lower carefully without damaging the terminals the whole on load tap changer through the hole in the transformer cover If the on load tap changer is equipped with tie in resistors mounted on the outside terminals they have to b...

Страница 15: ...way that there is no risk for them to come loose Furthermore the conductors must not cause mechanical stresses on the out side terminals Make an expansion bend on every conductor See Fig 5 Wrong Right CAUTION It is recommended that the distance between the cylinder and any conductor is at least 50 mm The transformer designer is responsible for providing sufficient insulating distances in the oil N...

Страница 16: ...on the fork they should be insulated with bushings to prevent circulation currents in the fork when the transformer is in operation Mounting of the on load tap changer to the yoke fork can be made according to two alter natives depending on when the testing of the transformation ratio shall be performed Transformer ratio measurement before drying see section 3 2 1 Transformer ratio measurement aft...

Страница 17: ...end positions on the single phase diagram and watch the position indicator in the bevel gear in order to avoid overrunning of the end position Watch the voltmeter during the on load tap changer operations No fast voltage drops may occur during operation If such drops occur the on load tap changer is not correctly con nected to the winding 6 After the measurement the position of the on load tap cha...

Страница 18: ...118 en Rev 4 fm_00209 FM_00203 3 Installation in the transformer Fig 8a Fig 8b Fig 8c Approx 15 mm Sealing for suction pipe max 90o max 90o O ring for upper flange O ring for upper flange Fig 7 O ring for top cover ...

Страница 19: ...ge the cover the O rings and the sealing for the suction pipe see Fig 8 and store them temporarily on a dustfree place NOTE The gear mechanism on the gear base plate needs not and shall not be re moved because it is fixed in the lower part 3 When lifting the on load tap changer onto the yoke fork it is recommended that lifting eyes M12 are mounted in the lower flange NOTE Check that the on load ta...

Страница 20: ...the lifting eyes when the on load tap changer is in right position on the yoke fork 5 The on load tap changer and the transformer is now ready for drying Follow the in structions in chapter 4 3 Installation in the transformer Approx 15 mm Fig 10 ...

Страница 21: ... Nut M12 16x Screw M8 12x Washer Upper flange 13 Guiding pin 10 5 15 Stud M12 16x Yoke fork Lower flange Cylinder O ring Gasket Not included in the delivery Lifting bar Gear mechanism 1 Place the O ring in its groove in the lower flange 2 Place the gasket around the opening of the transformer cover This gasket is not in cluded in the on load tap changer delivery Fig 11 Mounting onto the transforme...

Страница 22: ... lifting bar and mount a washer and a screw in each of the free holes 10 An alternative method if the lifting bar is not available is to use 4 studbolts M8x70 for lifting the cylinder Place the studs at opposite directions through the clearance holes in the upper flange and threaded into the lower flange Mount washers and nuts on the studs Then lift the cylinder by tightening of the nuts Check whe...

Страница 23: ...1ZSE 5492 118 en Rev 4 A A fm_00012 3 Installation in the transformer Fig 12 Cover Bevel gear Top cover Driving pin Hose clip Protective tube Screw M6 Coupling half A Guiding pin Driving disc View A A Key ...

Страница 24: ... shall be removed See section 3 2 2 point 1 To open the bottom valve proceed as follows 2 Use the delivered bottom valve key to engage the internal hexagon hole of the bottom valve Open the valve by turning anticlockwise max 4 turns 3 When drying in a vacuum pan with the hot air process the top cover of the on load tap changer the O ring and sealing of the suction pipe shall be removed See section...

Страница 25: ...transformer should be leveled 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 that the position indicator in the motor drive mechanism shows the same posi tion as the indicator inside the top cover of the on load tap changer WARNING Do not energize the transformer before the on load tap changer and motor drive mechanism...

Страница 26: ...ev 4 9 9 9 9 8 7 LOWER POSITION RAISE 9 8 7 6 5 4 10 11 12 13 14 9 fm_00240 fm_00235 5 Final assembly Fig 13 Position alignment for type BUE Indicator window Adjustment nuts Red mark Position indicator Brake disc Brake pads ...

Страница 27: ...3 14 15 16 17 18 19 fm_00241 fm_00235 5 Final assembly Fig 14 Position alignment for type BUL Indicator window Cam disc Brake disc Adjusting screw Contra nut Brake arm Roller on brake arm in the notch of the cam disc Position indication White indicator flag ...

Страница 28: ...on of the conservator and the oil filter unit if any The flanges A are equal and their accessories can be changed between them We recommend that the air release valve to the transformer see Fig 2 is replaced by a pipe to the gas operated relay in order to get a signal from the relay as quick as possible in case of gas production in the transformer CAUTION The pressure relay is a calibrated monitor...

Страница 29: ...e cleaned and greased for cor rect function and to avoid corrosion Apply a thin layer of grease GULF 718EP Synthetic grease or Mobilgrease 28 or SHELL Aero Shell Grease 22 to all spherical shaft ends and unpainted surfaces of the bevel gears CAUTION The motor drive mechanism and on load tap changer shall have the same indicated tap position See section 5 1 The inclination of the shaft the square t...

Страница 30: ...vel gear SA22 Horizontal square shaft SA23 Horizontal protective tube SA24 Horizontal protective tube SA25 Information plate SA26 Multiple hole coupling SA27 Hexhead bolt M8 1 SA28 Washer 1 SA29 Locknut M8 1 1 Included in SA 26 Vertical drive shaft Multiple hole coupling Motor drive mechanism BUE SA17 SA18 SA19 SA10 SA11 SA12 SA13 SA16 SA14 SA15 SA11 SA12 SA13 SA10 SA11 SA12 SA13 Bevel gear on the...

Страница 31: ...Length dimension for LB1 K1 190 to 290 mm K1 291 to 600 mm K1 greater than 600 mm LB1 K1 180 mm 2 LB1 K1 210 mm 2 LB1 K1 410 mm 2 Example K1 measured to 390 mm LB1 is then 390 210 600 300 mm 2 2 NOTE If K1 is greater than 600 mm the mounted tubes shall overlap each other at least 300 mm Dismounting and inspection of the couplings shall be possible when one of the tubes is pushed into the other 5 F...

Страница 32: ...ghten the two screws A first and thereafter the other see Figs 19 and 20 If necessary the axial play may be adjusted by moving the couplings on the shaft end according to Fig 21 7 Push the two protective tubes on to the bevel gears and clamp them with hose clips SA10 see Fig 23 NOTE The slot of the protective tubes SA23 and SA24 shall be facing downwards Apply the self adhesive information plates ...

Страница 33: ...0 mm 2 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 other See Fig 19 Put on the two protective tubes SA15 and SA16 and two hose clips SA10 See Fig 25 Fig 24 SA21 Fig 25 SA11 SA14 SA15 SA16 SA10 K2 LB2 Fig 26 Fig 27 Multiple hole coupl...

Страница 34: ...aligned with the red mark on the brake pad See Fig 13 EXACT position for the BUL is when the roller on the brake arm is in the notch of the cam disc See Fig 14 If out of position hand crank the motor drive mechanism to EXACT position according to above 9 Open the cover of the gear box on the top cover of the on load tap changer Check that the key on the vertical shaft in the bevel gear is facing t...

Страница 35: ...5 and mount the hose clip SA10 See Fig 31 Note the clearance for draining Min 3 mm max 5 mm 11 Remount the cover of the gear box on the top of the on load tap changer Fig 31 Earthing symbol Key in the bevel gear 140o 125o SA10 SA10 SA15 SA16 SA10 SA15 Min 3 max 5 mm Fig 30 Adjustment of bevel gear ...

Страница 36: ...ap changer an oil filter must be placed in the pipe between the on load tap changer and the conserva tor Oil filter with housing can be ordered from ABB on the Ordering data sheet 5 5 Before operation 1 Check that the on load tap changer and the motor drive mechanism have the same indicated position and that the key position of the on load tap changer bevel gear is in accordance to Fig 30 2 Remove...

Страница 37: ...load tap changer should be operated through the whole operating range both in lower and raise direction when carrying out ratio measurement The end positions must not be overrun during ratio measurement When operating the on load tap changer without drive system check the designation of the end positions on the single phase diagram and watch the position indicator in the bevel gear in order to avo...

Страница 38: ...elay 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 about to install ...

Страница 39: ...pressure relay 3 Raise the pressure until the pressure relay trips the circuit breakers for the transformer 4 Read the pressure on the manometer 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 Valve handle Test...

Страница 40: ...pheric pressure the air release valve on the flange should be opened and the trapped air let out Even better is to replace the air release valve with a pipe to the gas operated relay 7 2 Filling at atmospheric pressure 1 Open the conservator valve if any 2 Dismantle the pipe to the breather Or if simpler take away the dehydrating breather 3 Connect the pump to the oil valve on the on load tap chan...

Страница 41: ...the vacuum pump and let air into the conservator 8 Reassemble the pipe or the breather The connections must be airtight therefore use sealing tape on the threads and O rings in the flanges 7 4 Correct oil level For installations where the on load tap changer and the transformer tank have a common oil conservator the instructions for the transformer should be used If possible the oil levels of the ...

Страница 42: ...an appropriate gas cushion will be formed If the on load tap changer has been filled with degassed oil and has a very low frequency of operation the gas cushion may have been absorbed by the oil To avoid fault trip by the pressure relay the gas cushion should be restored as above CAUTION To operate the on load tap changer with a too small or no gas cushion means a risk for a trip of the pressure r...

Страница 43: ...on according to Figs 13 or 14 Operate the tap changer with the hand crank counting the number of turns from the exact position until the tap changer operates With BUL the tap changer should operate after 11 5 1 turn of the hand crank With BUE the tap changer should operate after 19 1 5 turns of the hand crank If not one of the shaft couplings of the gears are incorrect mounted Hand crank the motor...

Страница 44: ...oth the motor drive mechanism and the on load tap changer show the same position Operate one step and check that the on load tap changer follows the motor drive mechanism Operate the driving mechanism electrically between the end positions Check the end stops When trying to operate it electrically beyond the end position the motor should not get started Check the mechanical end stop by trying to h...

Страница 45: ...nservator is connected to the on load tap changer during transporta tion The on load tap changer should be filled with oil to normal operating level 9 2 2 Transport with dismounted conservator If the conservator is to be dismounted during transport the oil level in the on load tap chang er has to be lowered 1 Connect a pump to the oil valve and suck out oil until the oil flow stops The oil level w...

Страница 46: ...the relevant parts of this manual to carry out commissioning For information about tools materials and oil required see relevant parts in chapter 1 of this guide 10 2 Oil filling See chapter 7 10 3 Electrical connection and testing Do all wiring work and perform the appropriate tests as described in chapter 8 Remove the drying agent inside the cabinet of the motor drive mechanism Check that the ai...

Страница 47: ...t Tightening the screw clockwise makes the stop earlier and loosening the screw anticlockwise makes the stop later Tighten the contra nut after the adjustment 10 3 3 Counter Check that the counter functions upon RAISE and LOWER operations 10 3 4 Position transmitter and other multi position switches Check the function of the position transmitter and other multi position switches 10 3 5 Light Check...

Страница 48: ...onents SE 771 80 Ludvika Sweden Phone 46 240 78 20 00 Fax 46 240 121 57 E Mail sales se abb com www abb com electricalcomponents Contact us Copyright 2010 ABB All rights reserved 1ZSE 5492 118 en Rev 4 2003 03 30 ...

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