
Table of contents
Maschinenfabrik Reinhausen GmbH 202044983703/01 ENVACUTAP® VV-Ex
4 Packaging, transport and storage .................................................................................. 35
4.1 Packaging ......................................................................................................................................... 35
4.1.1 Suitability.............................................................................................................................................................35
4.1.2 Markings..............................................................................................................................................................36
4.2 Transportation, receipt and handling of shipments........................................................................... 36
4.3 Storage of shipments........................................................................................................................ 37
4.4 Unpacking shipments and checking for transportation damages ..................................................... 38
5 Mounting ........................................................................................................................... 39
5.1 Installation information...................................................................................................................... 39
5.2 Preparatory work .............................................................................................................................. 40
5.2.1 Fitting mounting flange on transformer cover......................................................................................................40
5.2.2 Fitting stud bolts on mounting flange ..................................................................................................................40
5.3 Installing the on-load tap-changer in the transformer (standard version) ......................................... 41
5.3.1 Fastening on-load tap-changer to transformer cover ..........................................................................................41
5.3.2 Connecting the tap winding and on-load tap-changer take-off lead....................................................................49
5.3.3 Performing transformer ratio test before drying ..................................................................................................50
5.3.4 Performing DC resistance measurement on transformer....................................................................................51
5.3.5 Drying on-load tap-changer in autoclave ............................................................................................................51
5.3.6 Drying on-load tap-changer in transformer tank..................................................................................................53
5.3.7 Filling the oil compartment of the on-load tap-changer with insulating fluid........................................................56
5.3.8 Performing transformer ratio test after drying .....................................................................................................57
5.4 Installing on-load tap-changer in transformer (bell-type tank version).............................................. 58
5.4.1 Inserting on-load tap-changer into supporting structure......................................................................................58
5.4.2 Connecting the tap winding and on-load tap-changer take-off lead....................................................................60
5.4.3 Performing transformer ratio test before drying ..................................................................................................60
5.4.4 Performing DC resistance measurement on transformer....................................................................................61
5.4.5 Drying on-load tap-changer in autoclave ............................................................................................................62
5.4.6 Lifting top part of on-load tap-changer head off supporting flange (bottom part) ................................................64
5.4.7 Attaching the bell-type tank and connecting the on-load tap-changer to the top part of the on-load tap-changer
head ....................................................................................................................................................................67
5.4.8 Drying on-load tap-changer in transformer tank..................................................................................................72
5.4.9 Filling the oil compartment of the on-load tap-changer with insulating fluid........................................................75
5.4.10 Performing transformer ratio test after drying .....................................................................................................76
5.5 Fitting protective devices and drive components.............................................................................. 77
5.5.1 Electrically connecting the temperature sensor ..................................................................................................77
5.5.2 Installing protective relay in piping and connecting.............................................................................................77