Separate Synchronising Relay - Deif GPC-3 Designers Reference Handbook

GPC-3 DRH 4189340587 UK
Requirements for blackout closing of the breaker:
Condition
Blackout detected
Generator voltage and fre-
quency OK
Using this function involves a risk of closing breakers out of synchronism. It is therefore re-
quired to take external precautions to avoid simultaneous closing of two or more breakers onto
a dead bus.

7.8 Separate synchronising relay

When the unit gives the synchronising command, the relays on terminal 17/18/19 (generator breaker) will ac-
tivate, and the breaker must close when this relay output is activated.
This default function can be modified using a digital input and extra relay outputs, dependent on the required
function. The relay selection is made in menu 2240, and the input is selected in the input settings in the utility
software.
The table below describes the possibilities.
DEIF A/S
Description
Blackout is detected when the voltage on the busbar is below 30 % of nomi-
nal busbar voltage
To initiate the black closing, the generator voltage and frequency must be in-
side the limits set in menus 2111 and 2112
Synchronisation
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