SDMO R570U - Page 71

Temporary coupling to the grid (A651)
This configuration is designed to provide:
 Emergency electricity supply to an installation following a grid loss. Return to the grid is achieved by a temporary coupling with
transfer of the generating set load to the grid.
 FORCED OPERATION with a generating set.
 Temporary coupling for “Effacement Jour de Pointe” (EJP)* mode or other rates (Information transmitted by dry contacts).
Regulation
module
Base
module
C
A
N
b
u
s
E
t
h
e
r
n
e
t
3PH + N
3PH
3PH
3PH
M
M
M
Optional
manual or
motorised
circuit
breaker
MMI Module
Application
(load)
Grid
* the “EJP” (Peak Day Load Shedding) system is specific to the French power grid.
Automatic operation (Kerys in “AUTO” mode) (temporary “grid return” coupling)
Loss of grid voltage
•
Adjustable grid loss acquisition delay (controlled by the Kerys or by a mains detection module).
•
Generating set start request.
•
The speed and voltage of the generating set increase.
• Power unit switched on, grid side.
•
Generating set power unit switched off after voltage and frequency stabilisation.
Return of grid voltage
•
Adjustable grid return acquisition delay (controlled by the Kerys or by a mains detection module).
• Synchronisation of the generating set to the grid.
• After synchronisation, the grid power unit is switched off.
• Transfer of the active and reactive power of the generating set to the grid according to a predetermined ramp. The ramp does
not exceed 10 seconds for transfer of the generating set’s rated output. The generating set power unit is disconnected when
the power on the generating set reaches the lower limit.
• Generating set power unit switched on.
• Cooling delay.
• Generating set stopped and set to standby.
The Kerys remains in “AUTO” mode
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