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14
O W I I I – I N D O O R D I S C O N N E C TO R
—
Fig. 9.
Drive mounted on the wall
The drive support [pos. 2, Fig. 9] together with
fixed bevel gear must be mounted in a way that the
axis of the smaller wheel from drive side coincides
with the axis of the smaller wheel on disconnector
shaft.
4.9 Mounting and regulation of auxiliary switch
When the disconnector is delivered with an auxiliary
switch, after coupling the disconnector with the
drive in the switchgear, coupling the disconnector
shaft with auxiliary switch must be done using rod
[pos. 1, Fig. 10] and lever [pos. 2, Fig. 10]. The lever
has to be fixed on shaft on opposite site to the
drive. Thanks to the knurled end of the disconnec-
tor shaft and the corresponding hole in the lever
[pos. 2, Fig. 10], it can be freely positioned on the
shaft with. When connecting rod [pos. 1, Fig. 10]
with lever [pos. 2, Fig. 10] the pin [pos. 4, Fig. 10]
need to be screwed into hole marked "45".
4.10 Connecting in switchgear and earthing
Before connecting the bars or cables to the discon-
nector terminals, terminals have to be thoroughly
cleaned from the oxidation (without surface dam-
age) and covered with the layer of grease. The bars
—
should be adapted to the disconnector connection
Fig. 9.
terminals. The cross-section of the conductive
Drive mounted
on the wall
bars should be matched to the rated current of the
disconnector. The connection screws should be
1) UEMC 41 drive
2) Drive support with
screwed on using two wrenches, so that the fixed
gear
contacts [pos. 4, Fig. 1] remain not bent. After in-
3) Connecting rod
4) Bevel gear NRK2/1
stallation, check that the connections do not cause
5) Manual lever
5
connection
stresses in the disconnector structure, causing
twisting of the contacts.
The apparatus and drive frames should be earthed.
Before connecting the protective earthing connec-
tion to the earthing terminal, the earthing termi-
nal should be cleaned and greased with acid-free
grease.
4.11 Final works
After installing disconnector in switchgear and
coupling with drive the following regulations
might be necessary, in order to avoid eventual
4
failures of disconnector and drive:
a) regulation of kinematics of coupling drive with
3
disconnector
b) regulation of kinematics of coupling auxiliary
2
switch with drive
c) checking and correction of contacts in current
path
Regulation of kinematics of coupling drive with
disconnector
After coupling the disconnector with the drive, the
1
following undesirable effects may occur:
a) in open position the open gap between open
contacts is smaller than required (dimension D,
Fig. 2) and in closed position the shaft is bent.
b) In open position the shaft is bent and in close
state movable contacts do not close completely
The defects should be eliminated by changing the
length of the connecting rod and correcting the
positioning of other elements included in the drive
coupling system with the disconnector. The defect
may also be caused by improper position of levers
on the disconnector shaft [pos. 12, Fig. 1] and drive
shaft. The defect is eliminated by correcting the
mutual positioning of these elements.
Regulation of kinematics of coupling auxiliary
switch with drive
This regulation is necessary if the signaling of
disconnector/drive position is not correct. The
position of lever [pos. 2, Fig. 10) should be regulat-
ed to reach proper and compliant with standards
indication of disconnector state.
Checking and correction of contacts in current
path
The movable contacts must cover the entire width
the fixed contacts. The 0,1 mm width feeler cannot
be placed between fixed and movable contact. If
above are not fulfilled that might indicate discon-
nector frame is bent (by screws fixing to support
structure). In order to eliminate defect the appro-
priate pads should be placed between frame and
support structure, that brings contacts correction.
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