Contents
1. Introduction _______________________________________________________9
1.1 Required tools _________________________________________________11
1.2 Required material _______________________________________________11
1.3 Oil ____________________________________________________________11
1.4 Oil conservator _________________________________________________11
1.5
Oil lter unit for continuous oil ltration ________________________________ 12
1.6 Weights _______________________________________________________12
1.7 Tightening torque _______________________________________________12
2. Receiving _________________________________________________________13
2.1 Unpacking _____________________________________________________13
2.2 Inspection upon receiving ________________________________________13
2.3 Temporary storage before assembly _______________________________13
3. Installation in the transformer _________________________________________14
3.1 Cover-mounting ________________________________________________14
3.1.1 Connection to outside terminals _______________________________15
3.2 Yoke-mounting ________________________________________________16
3.2.1 Mounting of the on-load tap-changer when transformer ratio
measurement is carried out before drying ____________________________17
3.2.2 Mounting of the on-load tap-changer when transformer ratio
measurement is carried out after drying _____________________________19
3.2.3 Mounting to the transformer cover from the yoke ________________21
4. Drying ____________________________________________________________24
4.1 Observations before processing ___________________________________24
4.2 Observations after processing ____________________________________24
5. Final assembly _____________________________________________________25
5.1 Mounting of the motor-drive mechanism ___________________________25
5.2 Mounting of accessories _________________________________________28
5.3 Mounting of external drive shafts __________________________________29
5.3.1 Mounting of horizontal drive shaft _____________________________31
5.3.2 Mounting of vertical drive shaft ________________________________33
5.4 Connection to the oil conservator _________________________________36
5.5 Before operation ________________________________________________36
5.5.1 Transformer ratio measurement after drying _____________________37
6. Pressure relay _____________________________________________________38
6.1 General _______________________________________________________38
6.2 Installation _____________________________________________________38
6.3 Checking at commissioning of the transformer ______________________39
7. Oil lling __________________________________________________________40
7.1 Filling methods and restrictions ___________________________________40
7.2 Filling at atmospheric pressure ____________________________________40
7.3 Filling under vacuum ____________________________________________41
7.4 Correct oil level _________________________________________________41
7.5 Restoring the gas cushion _______________________________________42
8. Electrical connection and testing _____________________________________43
8.1 General _______________________________________________________43
8.2 Connecting and testing __________________________________________43
8.3 Electrical tests on transformer ____________________________________44
8.4 After energizing _________________________________________________44
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