ABB OWIII, Инструкция по установке и эксплуатации

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6 O W I I I – I N D O O R D I S CO N N EC TO R
Disconnectors can be opened and closed by man-
ual drives type NRWO4/...- 3, HE, insulating stick
or electric drive type UEMC 41. Disconnectors
equipped with manual and electric drive can work
in vertical or horizontal positions. In case of opera-
tion by insulating stick only vertical position of
disconnector is possible
Manual or electric drive by connecting rod makes
the shaft of disconnector rotate together with
movable contacts, causing switching disconnector
from one fixed position to another. If operating
by insulating stick, the stick need to be hooked on
outer side of the lever and then energetically pulled
or pushed, depend on the disconnector state.
If the drive is equipped with an electromagnetic
lock it has to be unlocked before switching. When
the drive is equipped with a mechanical bolt lock
it must be unlocked by pulling the bolt before
switching the disconnector.
Construction of disconnector enables mounting-
up the earthing switches without making any
changes even when the disconnector is already
installed at site. Earthing switches can be located
from the fixed non-disconnectable contact side
(lower earthing switches) or from disconnectable
fixed contact side (upper earthing switches).
Bearings [pos. 14, Fig. 1] of earthing switch are
mounted on frame. In bearings there is inserted
drive shaft of earthing switch [pos. 15, Fig. 1] with
its movable contacts [pos. 16, Fig. 1] ended with
silvered contact covers [pos.17, Fig. 1]. Together
with fixed contacts [pos. 18, Fig. 1] they create
reliable electrical connections. The proper contacts
pressure is ensured by springs [pos. 19, Fig. 1] held
by caps [pos. 20, Fig. 1] and stops [pos. 21, Fig. 1]
mounted at the ends of movable contacts. Electri-
cal connection from movable contacts to frame is
provided by flexible earthing conductor [pos. 22,
Fig. 1]. On disconnector frame there is an earthing
terminal [pos. 23, Fig. 1] with screw M12x40.
Between disconnector shaft and earthing switch
shafts there is a mechanical interlocking consist
of locking rings [pos. 24 and 25, Fig. 1] and pivot
[pos. 26, Fig. 1] ensuring proper sequence of
switches. Disconnector switch and earthing switch
can be interlocked with one another in the follow-
ing manner:
– disconnector switch can be closed only when
earthing switch is opened
– earthing switch can be closed only when discon-
nector switch is opened