System Description; The Switchgear; Type Of Switchgear; Configuration Of Switchgear - Eaton Magnefix MD4 User Manual

2. SYSTEM DESCRIPTION

2.1 The switchgear

2.1.1

Type of switchgear

Magnefix is a fully enclosed type of switchgear.. The use of
quartz-powder-filled epoxy resin allows a very compact
configuration.
Magnefix MD4 switchgear is easy to install on site.
Magnefix switchgear offers high operational reliability, even
under adverse operating conditions. Magnefix switchgear is
shock-resistant, tropicalised and safe to touch because of
its double insulation.
2.1.2

Configuration of switchgear

Magnefix switchgear is a modular system built up of
standard panels. The basic modules (basic panels) are:

The cable panel, with bottom or top connection for
feeder cables;

The branch-circuit panel (usually combined with a fuse
or protected panel)

The fuse panel;

The protected panel;

The busbar connecting panel.
The switch panels (cable panel and branch-circuit panel)
are provided with single-pole switch caps; each phase
having one switch cap. A switch cap may be fitted with an
indicator for continuous overcurrents.
An outgoing cable can be connected to the fuse panel (for
example, for connection to a transformer).
Three single core plastic cables having a maximum 240
2
mm cross section may be connected to the protected
panel.
There are also modules for special uses, such as:

The busbar connecting panel;

The busbar connection for a cable;

The connecting panel (for example, for connection to
an Eaton high-voltage Capitole or SVS busbar
system);

The separate fuse panel (not connected to the
busbars, but having connection facilities for incoming
and outgoing cables).
The assembled modules are mounted in an upright or wall-
mounted frame. The modules can be assembled in any
sequence; a set of screw rods holds them together. Rubber
sleeves are used to ensure that no spark voltages can
develop at the connections between the panels.
The sides are provided with plastic plates, the top being
fitted with a dust cover. These facilities protect the
switchgear against dust, dirt and water drops.
Silver-plated tubular conductors act as busbars; they
create the electrically conductive connections between the
panels. The busbars are situated completely inside the
epoxy resin insulation.
Configuration
Magnefix switchgear comes in two configurations:

Switchgear built up of conventionally cast epoxy resin
insulated modules. These modules have a flat well-
finished outside surface.

Switchgear featuring pressure gelated epoxy resin
insulated modules. The outside of these modules has
a glossy appearance. From a functional point of view
there is no difference between the two configurations.
2.1.3

The cable panel

The cable panel has a three-phase connection point for the
cable (three round pins each measuring 12 mm). Fitted on
the cable panel are three switch caps on which the
connection between the cable and busbar can be seen to
be made or broken.
2.1.4

The branch-circuit panel

The branch-circuit panel is similar to the cable panel, but it
has no three-phase connection point for the cable. The
branch-circuit panel links the fuse or protected panel to the
busbar system. Fitted on the branch-circuit panel are three
switch caps on which the connection between the fuse or
protected panel and busbar can be seen to be made or
broken.
Magnefix MD4
991.184 G01 03 11