SYNCHROTACT® 5

Range of applications

Synchronizing devices are widely used in power stations or

industrial installations with their own power generating facilities,

where the generators need to be paralleled with an island line

or a public line, or in power distribution systems.

Power circuit breakers may only be closed if both voltages are

approximately synchronous (coincident). Otherwise, faults in

line operation, loading of the generators and, in extreme cases,

damage to the generators can result.

SYNCHROTACT® 5 performs these functions safely and reliably,

whether as a monitoring element for manual paralleling or as

an independent fully-automatic synchronizing device.

Command generation

The command generation calculates the necessary lead angle

αv, by which the paralleling command must be advanced

due to closing time delay. The action ensures that the main

contacts close at precisely the right time. If α reaches αv at

the same time as paralleling release (CHK RELEASE), the

command is issued. Under synchronous conditions, ie,

permanent paralleling release during the adjustable monitoring

time, tsup, the CMD is also issued without taking the lead

angle into consideration.