MR VACUTAP VV, Инструкции по установке и вводу в эксплуатацию

Страница: 122 / 198

5 Mounting
Maschinenfabrik Reinhausen GmbH 2020 122 4349322/01 EN VACUTAP
®
VV
®
5.4.6.2.1 On-load tap-changer sets and combinations
For two-column and three-column on-load tap-changer models, the individ-
ual on-load tap-changer columns are driven by a common motor-drive unit.
You must couple the on-load tap-changer heads above the transformer
cover together and ensure synchronous switching of the on-load tap-
changer columns.
Proceed as follows:
1. Check that the operating positions of all on-load tap-changers are identi-
cal (inspection window in the on-load tap-changer head). Each on-load
tap-changer must be in the adjustment position.
2. Turn the pressure segments of upper gear units to one side by loosening
the 6 M8 bolts / wrench size 13.
3. NOTICE! Move upper gear units into the required installation position
only by turning the drive shafts of the upper gear units with loosened pres-
sure segments. Otherwise, the on-load tap-changer may be damaged
when aligning the upper gear unit.
4. Swivel pressure segments back towards gear unit and tighten screws
(tightening torque 15 Nm). Ensure that the spring washer is between the
screw head and pressure ring segment and that the pressure ring seg-
ments are firmly in contact with the gear unit housing.
5. Note arrow on drive shaft flange under the stamped serial number. The di-
rection of the arrow indicates the direction of rotation when turning the
hand crank of the motor-drive unit clockwise and must be identical for all
gear units.
6. Move each on-load tap-changer separately one step by rotating the shaft
ends counter-clockwise until the on-load tap-changer operates.
7. Check that the operating positions of all on-load tap-changer heads are
the same.
8. Fit horizontal drive shaft between the on-load tap-changer heads. Individ-
ually couple each on-load tap-changer. Start with the on-load tap-changer
which is closest to the motor-drive unit.
9. NOTICE! After installing all drive shafts, continue cranking another 2.5
revolutions counter-clockwise on the drive shaft of the upper gear unit to
correctly complete the tap-change operation. An incomplete tap-change
operation may damage the on-load tap-changer.
10. Switch on-load tap-changer back into adjustment position by turning
drive shaft clockwise. Once the adjustment position has been reached
and the diverter switch has undergone the tap-change operation, con-
tinue cranking the drive shaft of the upper gear unit by another 2.5 revo-
lutions clockwise to correctly complete the tap-change operation.
11. Check operation of all on-load tap-changers. A slight time delay is per-
mitted.
12. Check that the operating positions of all on-load tap-changer heads are
the same.
13. Fit vertical drive shaft.