ABB BUF 3 User Manual

Contents
1. Introduction _______________________________________________________9
1.1 General _______________________________________________________9
1.2 Repair categories _______________________________________________9
1.3 Serial number __________________________________________________9
1.4 Spare parts list _________________________________________________10
1.5 Maintenance guide ______________________________________________11
1.6 Tightening torque _______________________________________________11
2. Trouble-shooting ___________________________________________________12
2.1 On-load tap-changer ____________________________________________12
2.2 Pressure relay __________________________________________________12
2 Trouble-shooting _____________________________________________13
2.3 Motor-drive mechanism __________________________________________14
2.3.1 Control system _____________________________________________14
2.3.2 Power system ______________________________________________16
2.3.3 Miscellaneous ______________________________________________16
3. Repairs and adjustments ____________________________________________19
3.1
Replacement of gasket between insulating board and selector switch unit 19
3.1.1 General ___________________________________________________19
3.1.2 Tools required ______________________________________________19
3.1.3 Material and spare parts required ______________________________19
3.1.4 Procedure _________________________________________________20
3.2 Replacement of gaskets between barrier board of steel and
selector switch unit _________________________________________________ 22
3.2.1 General ___________________________________________________22
3.3 Replacement of front cover and top cover gaskets ___________________22
3.3.1 General ___________________________________________________22
3.3.2 Tools required ______________________________________________22
3.3.3 Material and spare parts required ______________________________23
3.3.4 Procedure _________________________________________________23
3.4 Changing the end stops in motor-drive mechanism __________________23
3.4.1 General ___________________________________________________23
3.4.2 Tools required ______________________________________________23
3.4.3 Material and spare parts required ______________________________24
3.4.4 Procedure _________________________________________________24
3.5 Replacement of maintaining contact _______________________________26
3.5.1 Tools required ______________________________________________26
3.5.2 Spare parts required ________________________________________26
3.5.3 Procedure _________________________________________________26
3.6 Replacement of pressure relay ____________________________________26
3.6.1 General ___________________________________________________26
3.6.2 Tools required ______________________________________________26
3.6.3 Spare parts required ________________________________________27
3.6.4 Procedure _________________________________________________27

ABB BUF 3 Specifications

General

Brand	ABB
Model	BUF 3
Category	Industrial Equipment
Language	English