74 / 248
A-60
Functions and
characteristics
Source-changeover systems
Presentation
Some installations use two supply sources
to counter the temporary loss of the main
supply.
A source-changeover system is required to
safely switch between the two sources.
The replacement source can be a generator
set or another network.
Manual source changeover
This is the most simple system. It is controlled manually by a maintenance technician
and consequently the time required to switch from the normal source to the
replacement source can vary.
Amanual source-changeover system is made up of:
two devices (circuit breakers or switch-disconnectors) controlled manually
b
mechanical interlocking.
b
The interlock prevents connection to both sources at the same time, even
momentarily.
Remote-operated source-changeover systems
This is the most commonly employed system. No human invention is required. The
transfer from the normal to the replacement source is controlled electrically.
A remote-operated source-changeover system is made up of two circuit breakers or
switch-disconnectors equipped with motor mechanisms and:
an electrical interlocking system implemented in a number of manners
b
a mechanical interlocking system that protects against the consequences of an
b
electrical malfunction and prevents incorrect manual operation.
Automatic source-changeover systems
An automatic controller may be added to the remote-operated source-changeover
system for automatic source control according to programmable operating modes.
This solution ensures optimum energy management:
switching to a replacement source depending on external requirements
b
source management
b
load shedding
b
emergency source replacement, etc.
b
PB103937
PB103936
Service sector:
b
hospital operating rooms
b
safety systems for tall buildings
b
FRPSXWHU URRPV EDQNV LQVXUDQFH FRPSDQLHV HWF
b
OLJKWLQJ V\VWHPV LQ VKRSSLQJ FHQWUHV HWF
PB103934
Industry:
b
assembly lines
b
engine rooms on ships
b
FULWLFDO DX[LOLDULHV LQ WKHUPDO SRZHU VWDWLRQV HWF
PB103935
Infrastructures:
b
runway lighting systems
b
port and railway installations
b
FRQWURO V\VWHPV IRU PLOLWDU\ LQVWDOODWLRQV HWF
559E1700.indd
version: 1.0