Table of Contents
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Content
1. Introduction ..........................................................................................................................9
1.1 Type designation ...........................................................................................................11
1.2 Required tools ..............................................................................................................12
1.3 Required material ..........................................................................................................12
1.4 Oil .................................................................................................................................12
1.5 Oil conservator ..............................................................................................................12
1.6 Oil filter unit for continuous oil filtration...........................................................................13
1.7 Weights ........................................................................................................................13
1.8 Tightening torques ........................................................................................................13
2. Receiving ..............................................................................................................................14
2.1 Unpacking ....................................................................................................................14
2.2 Inspection on receipt .....................................................................................................14
2.3 Temporary storage before assembly..............................................................................14
3. Installation in the transformer ................................................................................................15
3.1 Cover-mounting ............................................................................................................16
3.1.1 UCL/VUCL with tap selector size III ........................................................................16
3.2 Yoke-mounting .............................................................................................................19
3.2.3 Mounting on transformer cover (after the drying process) .......................................23
3.3 Connection to terminals ................................................................................................25
3.4 Transformer ratio measurement .....................................................................................27
3.4.1 Transformer ratio measurement before drying .........................................................27
3.4.2 Transformer ratio measurement after drying ............................................................27
4. Drying ...................................................................................................................................28
4.1 Precautions before processing ......................................................................................28
4.2 Precautions after processing .........................................................................................28
4.3 Installation of diverter switch .........................................................................................28
5. Final assembly ......................................................................................................................30
5.1 Mounting of motor-drive mechanism .............................................................................30
5.2 Mounting of external drive shafts ...................................................................................34
5.2.1 Mounting of vertical drive shaft ...............................................................................34
5.2.2 Mounting of horizontal drive shaft for one unit .........................................................36
5.2.3 Mounting of horizontal drive shaft for two units .......................................................38
5.2.4 Mounting of horizontal drive shafts for three units ...................................................40
5.2.5 Before operation .....................................................................................................40
5.3 Supervisory equipment .................................................................................................40
5.4 Assembly of accessories ...............................................................................................40
5.5 Connection to the oil conservator ..................................................................................40
5.6. Connection of tube for oil sampling for VUC .................................................................41
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