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Idiomas disponibles
Idiomas disponibles
TECHNICAL SUPPORT
In case of any doubt about the installation or use, please contact the Technical Department of the CAPT.
STORAGE
Once the switch has been removed from its packaging, you should store it in a dry, clean and free of dust.
To better preserve the surface of the contacts, especially in the case of long stay in the warehouse, it is
recommended to lubricate the contacts with dielectric oil for transformers to perform some operation on
the full range of taps to allow cleaning of the surface of contact.
ASSEMBLY
The following assembly of the tap changer, the drive and accessories (bevel gears, shafts, aluminium
clamps etc.) are illustrated in the attached drawings, specific for the various connection schemes.
During assembly of drives or bevel gears, please verify that the contact surfaces of the gaskets are perfectly
flat and without imperfections.
Be careful when you have to drill the shaft to insert the elastic/cylindrical pins. Avoid any ovality and check
for proper hole diameter.
The connecting cables between the windings and the switch should never force or weigh on the tap
changer, even during fixing operations after drying process in the oven/autoclave.
Place the tap changer and the drive in the middle position before fixing shafts with pins, in order to split the
gap in both directions of movement (i.e. if the switch is a 5 position- put in position 3 (fig. 1).
Verify that in all positions the movable contacts being centred on axis with the fixed contacts (Fig. 2).
Particular attention should be given in the case of installation of the set of switches connected internally
with square shafts, aluminium clamps and joints made of brass. They enable mounting of the switch in
case it is not aligned, with a maximum inclination of the connecting shaft by 10 °. It is of fundamental
importance that the shaft is cut to a length such as to allow the free movement of square brass joints within
the corresponding hole with framework fixed to the switch, but not to allow release of the coupling from
brass square hole of the bushing; follow the patterns of example (fig. 3).
Assembly of groups of two or more columns is necessary to verify that the switches have the numbers on
the heads of aluminum on the same side and that the cylindrical bushes exhibit the markings with one, two,
three etc. points in the same horizontal position (fig. 4).
For fixing of the tap changers in pressboard is provided a slot in the terminal part. Keep loose the fixing
during the mounting operation and drying. After treatment fix adequately according to the shrinkage of the
material.
In case of a double group of contacts in switches in Pressboard, the movable contact of the group farthest
from the head is offset to compensate for the shrinkage of the material. The drive in this case must be
locked with the first group of contacts (closest to the head) in the central position (fig.5).
In the case in which the pattern of fitting requires the insertion of precision joints (cardan-joint) type "1S",
pay attention to areas of drilling "Z", for the application of cylindrical pins, which are highlighted in the
accompanying drawing (fig. 6 ).
DRYING PROCESS IN OVEN, AUTOCLAVE AND LUBRICATION
• Before and after drying process, must be lubricated with dielectric oil, all fixed and moving contacts,
gears, switch, otherwise immerse the tap changer, along with the active part, in the oil filled transformer
tank.
• Do not operate the switch contacts with non-lubricated, and wait until the switch is returned to ambient
temperature and then make the first operation.
• The maximum temperature recommended for the treatment is 100 to 110°C. In the case of drying
procedures with higher temperatures or special process, contact the technical CAPT.
• After treatment in the oven and / or autoclave is essential to check all nuts and bolts, including spring pins
of the tap changer, bevel gears and control, and possibly fix or replace loose parts (pins).
ASSEMBLY OF BEVEL GEARS AND DRIVE
In the attached drawings (Fig. 7-8-9-10) are represented the main assembly diagrams. For more information
consult the catalogue CAPT.
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