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Motor-drive mechanism, type BUE 2 Technical guide 1ZSE 5483-104 en, Rev. 3, 2004-05-30

Tap Changer ABB

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Page 1: Tap Changer ABB

Motor-drive mechanism, type BUE 2Technical guide

1ZSE 5483-104 en, Rev. 3, 2004-05-30

Page 2: Tap Changer ABB

This technical guide has been prepared to provide transformer manufacturers, and theirdesigners and engineers, with the technical information required for selecting appropriateon-load tap-changers and motor-drive mechanisms. To ensure that the best selectionsare made, the guide should be used in conjunction with the Selection Guide and theDesign Guides.

Technical information regarding on-load tap-changers and motor-drive mechanisms fromABB is presented in separate documents, with one document for each type.

The information provided in this document is not comprehensive and thus does not coverall possible applications. Any specific application not covered by this document should bereferred directly to ABB or an authorized representative.

ABB makes no warranty or representation and assumes no liability for the accuracy of theinformation in this document or for the use of such information. All information in thisdocument is subject to change without notice.

Page 3: Tap Changer ABB

General information_____________ 4Applications __________________________ 4Design ______________________________ 4Cabinet ______________________________ 4Ambient Air Temperature ________________ 6Connection of motor-drive mechanismto tap-changer ________________________ 6Rating plate __________________________ 7

Principles of operation __________ 8Local control __________________________ 8Through positions ______________________ 8Remote control ________________________ 8Step-by-step operation __________________ 8Protection against running-through ________ 8Contact timing ________________________ 8

Standard version _______________ 12Control ______________________________ 12Protection ____________________________ 12Indication ____________________________ 12Wiring _______________________________ 12Maintenance __________________________ 12Optional accessories ___________________ 12

Anti-condensation coverage ___________ 12Outlet ____________________________ 12Extra heater________________________ 12Hygrostat __________________________ 12Tropical version _____________________ 12

Multi-Position Switches _________________ 12

Technical data _________________ 13

Dimensions ___________________ 14BUE 2 with attachment lugs ______________ 14BUE 2 with anti-vibration pads ____________ 15

Table of contents

Page 4: Tap Changer ABB

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General informationApplicationsThe motor-drive mechanism is designed for outdooroperation of the on-load tap-changers UBB, UCG, UCL,UCC and UCD.

DesignBUE contains all the necessary equipment for operation ofthe tap-changer. A large range of special equipment canalso be supplied in order to fulfil all customers' requests.Complete parallelling and voltage regulation systems canalso be supplied to supplement the motor-drive and thetap-changer.

CabinetThe cabinet is of welded sheet steel and is treated foroutdoor usage. All surfaces are finished with a primer anda blue coloured top coat. The front door is formed as a capin order to give good access to all parts of the mechanism.The door can be hinged on either the left or right handside. Provision is made to fit padlocks. The door is sealedwith a rubber gasket and the window is glued to the door.

The cabinet can be supplied with two different fixingdevices, either with attachment lugs for screwing directlyto the transformer side or with anti-vibration pads. Thebottom has a flange opening for cable connection. Ondelivery the opening is covered with a 5 mm thick light-alloy cover.

The cabinet has two vents. Filters prevent insects fromentering. The anti-condensation heater is permanentlyconnected. The motor drive functions satisfactorily down to-40 °C (-40 °F). Cabinet lighting is automatically switchedon when the door is opened.

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Fig. 1. Motor-drive mechanism, type BUE.

B1, B2 (Option) Thermostat or hygrostat for extraheater 100 W

E1 Heater 50 W (behind the panel)E2 Optional 100 W (behind the panel)E3 Lamp (40 W socket E27)Q1 Protective motor switchS1 LOCAL/REMOTE switchS2 RAISE/LOWER switchS8 Emergency stopS9 Door-operated switch for lampS10 (Option) Switch for extra heaterX1-17 Terminal blocks (behind the panel)X38 (Option) Outlet with earth fault protector

1 Locking device prepared for padlock4 Air vent7 Outgoing shaft9 Lifting eye10 Counter11 Tap-change in progress indicator12 Position indicator with draghands for

max. and min. position13 Shaft for hand crank20 Hand crank21 Descriptions and circuit diagram

1 S8 S10 4 S1 S2 7 E3 9 10

21 20 S9 B1,B2 Q1

11

12

13

E1E2

X38

X1-17

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Ambient Air TemperatureThe ambient air temperature requirements for the Motor-Drive Mechanism are shown in fig. 2. The normaloperating range is between –40 °C and +60 °C.

The Motor-Drive Mechanism has been type tested atambient air temperatures of –40 °C and +70 °C.

Fig. 2. Motor-Drive Mechanism ambient air temperature

Connection of motor-drive mechanismto tap-changersThe connection between the tap-changer and themechanism is made by an outgoing shaft through the topof the mechanism cabinet.

The Motor-Drive Mechanism must beshaded from sun radiation by screens.It must be specially equipped if theambient temperature exceeds +70 °C.

Normal operating range.(50 W heater shall operate).The temperature inside the cabinetshould not exceed +75 °C.

Extra 100 W heater and anti-condensationcoverage are required.

Extra 100 W heater is required.

ABB should be consulted.

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Rating plateThe rating plate shows data for both the tap-changer andmotor-drive mechanism and is placed on the front doorof the motor-drive mechanism.

Fig. 3. Example of rating plate

fm_00272

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Principles of operationLocal controlControl selector switch (S1) in position LOCAL. Raiseimpulse is given by control switch (S2). Contactor (K2) isthereby energised and will be kept so via starting contact(S11:1-2) and its own holding contact. The motor (M1)starts running and soon the maintaining contact (S12:3-4)closes and takes over the control of the motor contactor(K2). At the end of the operation, the contact (S12:3-4)opens, and after a period long enough to secure anopening of the contactor (K2) the starting contact (S11:1-2)closes again. A brake, operated by the arm for themaintaining contact, makes the drive stop in the normalservice position.

The lowering operation is carried out in a similar manner.

Through positions(dead switching steps)

The continuation contact (S15) bridges the maintainingcontacts (S12:3-4) and (S12:1-2) via the auxiliary contactson raise contactor (K2) at the through positions. In thisway the contactor (K2) RAISE or (K3) LOWER is keptenergised and the motor will automatically perform anotheroperation.

The connection of (S15) to auxiliary contacts on (K2)means that the drive in the event of a control supply failurein a through position will always move to a lower normalservice position.

Remote controlControl selector switch (S1) in position REMOTE. Thecontrol supply for the remote push buttons is then receivedfrom a terminal in the motor-drive cabinet and incomingcontrol circuits for raise and lower impulses are to beconnected to other terminals as shown in the diagram.Local operation is not possible when switch (S1) is inposition REMOTE and remote operation is not possible inposition LOCAL.

Step-by-step operationStep-by-step relay (K1) connected so that only one tapchange operation is obtained each time the raise/lowerswitch is operated.

Protection against running-throughA relay (K6) stopping the motor-drive mechanism in caseof a failure of the step-by-step control circuit, which wouldcause a running-through of the motor-drive mechanism.The relay energizes the trip coil in the protective motorswitch (Q1).

Contact timingThe contact timing diagram shows contact operatingsequences for one change of the tap position, which isequal to 25 turns of the hand crank.

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Fig. 4. Circuit diagram.

fm_00280

1)

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fm_00281fm_00282

Fig. 5. Contact timing diagram.

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E1 Anti-condensation heaterE3 Cabinet lightK1 Contactor, step-by-step operationK2 Contactor, RaiseK3 Contactor, LowerK6 Time relay, running-through protectionM1 MotorQ1 Protective motor switchS1 Control selector switch Local-0-RemoteS2 Control switch Raise-0-LowerS5 Interlocking switch, open when hand crank is fittedS6 Cam switch (Limit switch)

S6.1: Lower tap positionS6.2: Upper tap position

S8 Push button, Emergency stopS9 Switch, door operatedS11 Cam switch

1-2 Starting contactS12 Cam switch

1-2, 3-4 Maintaining contact5-6, 7-8 Interlocking contact9-10, 11-12 Auxiliary contact13-14, 15-16 Auxiliary contact

S14 Position transmitter, potentiometerS15 Continuation contact

Remote control

Local control

Protective earth

Raise operation

Lower operation

Crank

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Standard versionControl• Control selector switch, Local-0-Remote.• Control switch, Raise-0-Lower.• Hand crank for manual operation.

Protection• Protective switch for the motor with thermal overload

release and magnetic overcurrent release.• Limit switches – in both control and motor circuits.

• Mechanical end stops.

• Interlocking contact in the control circuit to preventelectrical operation during manual operation.

• Interlocking contacts in raise and lower control circuitsto prevent operation in wrong direction of rotation (withwrong phase sequence).

• Motor contactors are electrically interlocked.

• Protection against running-through in case of a failureof the step-by step control circuit.

• Emergency stop push button.

Indication• Mechanical position indicator.

• Drag hands for max. and min. position indication.

• Tap-change in progress indicating red flag.

• Operation counter.

• (The above four items are visible through the window inthe door).

• Position transmitter (potentiometer) for remote positionindication.

WiringThe wiring is of grey polyvinylchloride insulated, strandedwire. Type and data see Technical data. Every wire ismarked with figures corresponding to terminal numbers.All external connections are made of thermo-setting resin.Type and data see Technical data.

Short circuit protection (fuses) for motor control and heatersupplies, if required, should be installed in the controlcabinet or other separate compartment.

MaintenanceThe motor-drive mechanism should be inspected regularly,at the same time as the tap-changer is overhauled. Forfurther information see the overhaul instructions. Theinspection consists only of checking a few points and ifnecessary lubricating and greasing.

Optional accessories

Anti-condensation coverage

The motor-drive cabinet inside can be supplied with ananti-condensation coverage.

Outlet

Socket outlet according to DIN or ANSI. Prepared forsocket outlet, i.e. holes are cut out in the panel and cablesare wired to the panel for the outlet.

Extra heater

Extra heater, 100 W, with thermostat and switch for e.g.use in arctic climate.

Hygrostat

For tropical climate the heater can be controlled by ahygrostat.

Tropical version

The motor-drive mechanism can be equipped to meet therequirements for humid tropical climates and desertconditions.

Extra Multi-Position SwitchesMaximum 10 extra contact rows can be accomodated.

Extra positiontransmitter

Auxiliary contactBreak-before-make Make-before-break

Voltage transformerswitch (Furnace)

Step switch forparallel control

Follower switchfor parallel control

Number of contact rows

Note: Master switch for parallel control is a break-before-make auxiliary contact.

1 1 1

1

2 21

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Technical dataStandard version

220-240/380-420 V, 50 HzMotor-voltage, 3-phase

CurrentRated outputSpeed

1.9/1.1 A0.37 kW1400 rev/min

Alternative versions

208 V, 60 Hz220-240 V, 60 Hz110/220 V DC

Special versions at anadditional price120/240 V, 1-phase, 60 Hz230 V, 1-phase, 50 Hz110-127/220 V DCOptional

Voltage for control circuit 110/120 V, 50-60 Hz220-230 V, 50 Hz240 V, 50 Hz

110 V, 220 V DC220-240 V, 60 Hz

110 V, 125 V, 220 V DCOptional

Voltage for heater 208-240 V 110-127 V

Optional

Optional

Middle positionmarked N (normal position)

Lowest positionmarked 1

Mechanical position indicator

Terminal blocks in BUE 2Number ofterminals supplied

Max. number that can beaccommodated

33 - Phönix UK 5N41 A, 800 V, AC acc. to IECCross section: 0.2-4 mm2

270 - Phönix UK 5N200 - Phönix URTK/S Ben200 - Phönix URTK/S150 - Phönix OTTA 6150 - Klippon RSF1

Cabling Type H07V2-K, 1.5 mm2, 750 V, 90° C Optional

Test voltage on control circuits 2 kV (50 Hz, 1 min)

Anti-condensation heater(Functions without extraheater down to -40° C) 50 W Additional 100 W

Approx. operating time 6 s

Number of revolutions per operation ofthe outgoing driving shaftthe hand crank

525

Max. torque on the outgoing shaft 60 Nm

Max. number of positions 35

Degree of protection of cabinet IEC 60529 IP 56

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Dimensions

Fig. 6. Dimensions.

FL33onlywhenordered

FL33

A – A

BUE 2 with attachment lugs

Mass: ~155 kg

940

624

1050

600

R660

605 (at 135°)

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Fig. 7. Dimensions.

FL33 onlywhenordered

FL33

A – A

BUE 2 with anti-vibration pads

Mass: ~155 kg

605 (at 135°)

R660

600

624

1050

Page 16: Tap Changer ABB

Printed in Sweden by Globe, Ludvika, 2004

ABB Power Technologies ABComponentsVisiting address: Lyviksvägen 10Postal address: SE-771 80 Ludvika, SWEDENTel. +46 240 78 20 00Fax +46 240 121 57E-mail: [email protected]/electricalcomponents 1Z

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