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I N S TA L L AT I O N A N D O P E R AT I O N M A N U A L
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Introduction
The subject of this document is the installation
and operation of three-pole indoor disconnectors
type OWIII (and one pole OWI). It contains informa-
tion about technical data, design and function, as
well as advices for operation, maintenance, repair,
etc. The Manual is intended to be a help in the
process of installation, maintenance and usage
of these devices. Strict adherence to the require-
ments contained in this manual ensures proper
operation of switches and is a warranty condition,
therefore, familiarize with its contents is required
prior to installation and operation of switches.
The manufacturer do not bear responsibility for
any direct or indirect loses or damages caused
by improper usage of these apparatuses.
The contents of this manual can be changed with-
out notice.
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Technical description of OWIII (OWI)
disconnectors
3.1
Functions
Disconnectors
Three-pole indoor disconnectors are used for
opening and closing electrical circuits in which
current does not flow (they are off-load devices).
In the open position they create a visible and safe
isolation gap, ensuring that an electrical circuit
and sections of medium voltage networks are
completely de-energized for service or mainte-
nance. They are used in indoor AC high-voltage
switching systems. They are suitable for working
in confined spaces in moderate climate condi-
tions at an ambient temperature of -5°C to +40 °C.
Installing device in other environmental conditions
must be agreed with the manufacturer.
Disconnectors type OWIII (OWI) fulfil the require-
ments of following standards:
– PN-EN 62271-1:2009 High-voltage switchgear and
controlgear – Part 1: Common specifications
– PN-EN 62271-102:2005 + AC: 2005 (U) High-
voltage switchgear and controlgear – Part 102:
Alternating current disconnectors and earthing
switches
Earthing switches
Earthing switch is used for short-circuiting and
earthing parts of a circuit previously disconnected
from the power supply. Each disconnector OWIII
can be equipped with earthing switch with inter-
locking mechanism ensuring correct sequence of
switching operations.
3.2
Construction and principle of operation
Disconnectors type OWIII are vertical break switch-
es. The basis is a steel frame [pos. 1, Fig. 1], which
together with the shaft [pos. 2, Fig. 1] and limiters
of rotation angle [pos. 3, Fig. 1] creates a disas-
sembled unit. Insulators [pos. 4, Fig. 1] are mount-
ed on frame, and they support current path. Each
current patch consist of two fixed contacts [pos. 5,
Fig. 1], which are also terminals and one movable
contact [pos. 6, Fig. 1]. The fixed contacts and the
ends of the movable contacts are silvered. The
right pressure of contacts is provided by springs
[pos. 7, Fig. 1] held by cups [pos. 8, Fig. 1] and stops
[pos. 9, Fig.1] at the ends of the movable contacts.
In some types of switches there are additional
steel plates mounted on movable contacts.
Insulation between poles is an air gap. In some
types where the pole distance is decreased there
are additional isolating plates [pos. 10, Fig. 1].
Movable contacts are connected to the shaft
by insulation rods [pos. 11, Fig. 1]. They transfer the
rotation of the shaft to the disconnector moving
contacts.
On both ends the disconnector shaft [pos. 2, Fig. 1]
is knurled, which enables coupling the disconnec-
tor to the drive by the lever [pos. 12, Fig. 1]. There
is an additional arm mounted on the lever and is
used when the disconnector is operated by isolat-
ing hook stick. The rotation angle of disconnector
shaft is determined by stops that breaks on sides
notches (while opening) and a bumpers (when
closing).
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