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7.2 Three-position disconnector operation
The "off -load" three-position disconnector is ma nually
operated by means of a manual mechanism.
A firm action is required to overcome the resistance
as the blades make contact.
If excessive resistance is experienced, stop and make
sure that the operation is correct.
An
interlocked
selector
prevents the following: three -position disconnector
movement with the circuit -breaker closed, circuit-
breaker closing whilst the selector is in use and three-
position disconnector moving directly from ON to
EARTH positions (and vice versa).
Unless the three-position disconnector is fully in the
EARTH, OFF or ON position, circuit -breaker closing
and
removal
of
the
operating lever is mechanically limited.
The fully end position of three -position disconnector in
ON, OFF or EARTH position is achieved by final
position
of
operating
operation slot. The operating handle after finishing the
movement should almost touch the upper or bottom
edge of operating slot
Not correct position of operating handle is indicated in
(Figure 91)
- variants B and D.
The fully end positions of three -position disconnector
are also indicated by status indi cator on the front
cover
(Figure
35).
inadvertent operations, it is possible to lock the
selector mechanism by means of two padlocks
90): one in the position OFF -EARTH of the three-
position disconnector, and the other in the position
OFF-ON of the three-position disconnector.
W ARNING
The removing of operation handle before reaching
fully end position is not allow ed otherw ise the
functionality
of
interlock
damaged.
F i g u re 91: Po si ti o n o f o p erati n g h an d l e.
48
mechani sm
(Figure
three -position
disconnector
handle
in
the
front
(Figure 91)
- variants A and C.
To
prevent
dangerous
mechanism
90)
cover
or
(Figure
F i g u re 90: Th ree - p o si ti o n d i sco n n ecto r
1
Int erl ock ed select or mec han is m
2
Padlock
can
be
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