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7.3 Test operations
Switches with K-mechanism will close when the
operating shaft is turned anti-clockwise. The
switch will open when the operation shaft is
turned clockwise. (Clockwise/anti-clockwise as
seen from the mechanism side of the switch).
When operating switches are equipped with
A-mechanism, the opening spring is first charged
and latched by turning the operating shaft
clockwise. Turning the shaft anti-clockwise
charges the closing spring and the switch closes.
The switches open when the operating shaft is
turned clockwise.
7.4 Preparation of the supporting structure
The switch-disconnector is intended for vertical
or horizontal operations. The design of a
supporting structure shall consider the
geometrical configuration of the apparatus
(vertical or horizontal) and minimal clearances to
both earthed and live parts. The supporting
structure shall be rigid enough to avoid some
deformation of the apparatus base. All the
touching points of the supporting structure and
the apparatus base shall lay in the same plane.
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7.0 Installation
7.1 Before installation
Before installing, carry out visual check of switch.
Make sure that main contacts are greased with
Isoflex Topas NCA 52. In case of NAL 12/17/24/36
with A mechanisms , make sure that the push
rods are removed from the main shaft.
7.2 Preparation of the switch for installation.
Fig. 1
For switches with A-mechanisms, the contact
knives must be fully opened by hand and the draw
bars connected to the cranks. Before the switch is
test operated, it should be checked that the
surfaces of the main contact are covered by
contact grease (recommended grease: ISOFLEX
TOPAS NCA 52). ABB recommends to install this
switch-disconnector in applications where it is
possible to visually check main knives position
e.g. through inspection window.
—
1 Switch-disconnector type NAL/NALF/VR
_
WARNING
Current knives rotate with great speed and
force. Always keep a safe distance from
moving parts of the switch. Be careful with
type A (double spring) mechanism. This
kind of drive stores great energy and can
release it by small rotation of shaft.
_
CAUTION!
In case of A mechanism, after switch
closing or opening (without opening
spring charged) do not turn the
mechanism shaft in the closing direction.
It can cause damage of mechanism. Keep
well clear of contact knives when
operating the switches. During installation
on non-flat surfaces, use shims correcting
inequalities. This will prevent the stress
forces in the switch frame When
inequalities of surface are significant, use
a rigid support structure, e.g. made by
ABB.