ABB BUE Manuale operativo

Motor-drive mechanisms,

types BUE and BUL2

Maintenance guide

1ZSC000498-ABH en, Rev. 1

Original instruction

The information provided in this document is intended to be general and does not

cover all possible applications. Any specific application not covered should be

referred directly to ABB or its authorized representative.

ABB makes no warranty or representation and assumes no liability for the

accuracy of the information in this document or for the use of such information. All

information in this document is subject to change without notice.

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.

Recommended practices

ABB recommends careful consideration of the following

factors when installing on-load tap-changers:

Before you install or commission a unit, make sure that the

personnel doing the job have read and fully understood the

Installation and commissioning guide provided with the unit.

To avoid damaging the unit, never exceed the operating limits

stated in delivery documents and on rating plates.

Do not alter or modify a unit without first consulting ABB.

Follow local and international wiring regulations at all times.

Use only factory-authorized replacement parts and

procedures.

WARNING, CAUTION and INFO

WARNING

WARNING indicates an imminently hazardous

situation which if not avoided, will result in death or

serious injury. This signal word is to be limited to the

most extreme situations.

WARNING also indicates a potentially hazardous

situation which if not avoided, could result in death or

serious injury.

CAUTION

CAUTION indicates a potentially hazardous situation

which if not avoided, may result in minor or moderate

injury. It may also be used to alert against unsafe

practices.

CAUTION may also indicate property-damage-only

hazards.

INFO provides additional information to assist in

carrying out the work described and to provide

trouble-free operation.

Safety precautions

WARNING

The maintenance guide should be read and

understood before any work is started, and the

procedures in the document should be followed at all

times.

WARNING

Before starting any work inside the motor-drive

mechanism, the auxiliary power must be switched off.

N.B. The motor, the contactors and the heating

element may be energized from separate sources.

During service

WARNING

Small amounts of explosive gas might 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.

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 tap-changer is not in its exact position and the

hand crank is pulled out, the motor-drive mechanism

will start and run to the exact position if the power

supply is on.

Content

1. Introduction ..........................................................................................................................7

1.1 General ........................................................................................................................7

1.2 Design ..........................................................................................................................7

1.3 Legend .........................................................................................................................7

2. Inspection.............................................................................................................................12

2.1 Required tools and material ..........................................................................................12

2.2 Procedure.....................................................................................................................12

3. Overhaul...............................................................................................................................13

3.1 Required tools and materials.........................................................................................13

3.2 Motor protection ...........................................................................................................13

3.3 Ground fault protector (option) ......................................................................................13

3.4 Counter ........................................................................................................................13

3.5 Heater...........................................................................................................................13

3.6 Toothed belt..................................................................................................................14

3.7 Motor cable connections ..............................................................................................14

3.8 Overhaul type BUE .......................................................................................................14

3.8.1 Disc brake ..............................................................................................................14

3.8.2 Brake for the holding contact..................................................................................15

3.8.3 Position transmitter and other position switches .....................................................15

3.8.4 Lubrication .............................................................................................................15

3.9 Overhaul type BUL2......................................................................................................17

3.9.1 Disc brake ..............................................................................................................17

3.9.2 Position the transmitter and other position switches ...............................................17

3.9.3 Lubrication .............................................................................................................17

3.10 Operation test.............................................................................................................18

4. Specication of materials ......................................................................................................19

1ZSC000498-ABH en, Rev. 1 | Maintenance guide BUE/BUL2 7

1. Introduction

1.1 General

The motor-drive mechanisms, types BUE and BUL2,

manufactured by ABB, have been developed over many years

to provide maximum reliability. The simple and robust design

gives a service life equal to the service life of the transformer.

Minimum maintenance is required for trouble-free operations.

The motor-drive mechanism is attached to the transformer

tank and connected to the on-load tap-changer by means of

drive shafts and a bevel gear.

1.2 Design

The design and layout of the motor-drive mechanisms are

shown in Figs. 1 and 2 (BUE) and Figs. 3 and 4 (BUL2).

1.3 Legend

Towards motor-drive upper limit

Towards motor-drive lower limit

LOCAL control

REMOTE control

8 Maintenance guide BUE/BUL2 | 1ZSC000498-ABH en, Rev. 1

101 4 568 83 2 97 11

14 13 16

1. Locking device prepared for padlock

2. Emergency stop

3. Air vent

4. LOCAL/REMOTE switch

5. RAISE/LOWER switch

6. Outgoing shaft

7. Lamp (40 W socket E27)

8. Lifting eye

9. Counter

10. Tap-change in progress indicator

11. Position indicator with drag hands for max. and min.

position

12. Shaft for hand crank

13. Protective motor switch

14. Door-operated switch for lamp

15. Hand crank

16. Descriptions and circuit diagram

Fig. 1. Cabinet layout of motor-drive mechanism, type BUE.

1ZSC000498-ABH en, Rev. 1 | Maintenance guide BUE/BUL2 9

Fig. 2. Mechanical design of motor-drive mechanism, type BUE.

Position

transmitter

Contact plate

Brake

Roll pin

Supporting

shaft

Holding contact

Brake disc

Brake block

Brake for holding contact

Cam disc

Motor

Toothed belt

Arm system

Drive roller

One turn shaft

Geneva wheel

10 Maintenance guide BUE/BUL2 | 1ZSC000498-ABH en, Rev. 1

2 14 34 5

1. Position indicator with drag hands for max. and min.

position

2. Tap-change in progress indicator

(Red: in progress, White: in position)

3. Counter

4. Outgoing shaft with multi-hole coupling half

5. Shaft for hand crank

6. Locking device prepared for padlock

7. (Option) Outlet

8. Emergency stop

9. RAISE/LOWER switch

10. LOCAL/REMOTE switch

11. Protective motor switch

12. Air vent

13. Door-operated switch for lamp

14. Lamp

15. Descriptions and circuit diagram

16. Hand crank

Fig. 3. Cabinet layout of motor-drive mechanism, type BUL2.

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