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A distribution switchboard distributes incoming power supply into separate circuits. It has three main functional unit types: fixed units that cannot be isolated without shutting down the entire board, disconnectable units mounted on removable plates with isolation on the upstream and disconnects downstream, and drawer-type withdrawable units where the switchgear mounts on a horizontally withdrawable chassis. Distribution switchboards are used for main low voltage, motor control centers, sub-distribution, and final distribution according to application needs.

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Abu Saro Dimasangka
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38 views1 page

Report Abu

A distribution switchboard distributes incoming power supply into separate circuits. It has three main functional unit types: fixed units that cannot be isolated without shutting down the entire board, disconnectable units mounted on removable plates with isolation on the upstream and disconnects downstream, and drawer-type withdrawable units where the switchgear mounts on a horizontally withdrawable chassis. Distribution switchboards are used for main low voltage, motor control centers, sub-distribution, and final distribution according to application needs.

Uploaded by

Abu Saro Dimasangka
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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A DISTRIBUTION SWITCHBOARD is the point Main types of functional units

at which an incoming-power supply divides into


separate circuits, each of which is controlled Three basic technologies are used in functional
and protected by the fuses or switchgear of the distribution switchboards.
switchboard.
 Fixed functional units
The distribution switchboard enclosure provides
dual protection: These units cannot be isolated from the supply
so that any intervention for maintenance,
 Protection of switchgear, indicating modifications and so on, requires the shutdown
instruments, relays, fusegear, etc. of the entire distribution switchboard.
against mechanical impacts, vibrations
and other external influences likely to  Disconnect able functional units
interfere with operational integrity
 The protection of human life against the Each functional unit is mounted on a removable
possibility of direct and indirect electric mounting plate and provided with a means of
shock isolation on the upstream side (busbars) and
disconnecting facilities on the downstream
Types of distribution switchboards (outgoing circuit) side.

The load requirements dictate the type of  Drawer-type withdrawable functional


distribution switchboard to be installed units

Distribution switchboards according to specific The switchgear and associated accessories for a
applications complete function are mounted on a drawer-
type horizontally withdrawable chassis. The
The principal types of distribution switchboards function is generally complex and often
are: concerns motor control.

 The main LV switchboard - MLVS - (see


Figure E27a)
 Motor control centers - MCC
 Sub-distribution switchboards
 Final distribution switchboards

Two technologies of distribution switchboards

A distinction is made between:

 Traditional distribution switchboards in which switchgear and fusegear, etc. are fixed to a
chassis at the rear of an enclosure
 Functional distribution switchboards for specific applications, based on modular and
standardised design.

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