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Electric Power Generation
Installation and maintenance
5747 en - 2018.10 / a
Dual plate D700
5
1.2.2. Of the equipment
The dual plate D700 allows switching from one AVR to a second one, while the generator is running.
To make this switching happen, different components come into play:
•
The D700 AVRs exchange information via a serial communication bus.
•
Three separate 24 VDC power supplies: one for each AVR and one for the control circuit
(relay technology).
•
Two contactors allow switching of the generator field circuit.
•
Two freewheel diode modules, connected on the field circuit, to ensure it never opens.
All the controls:
•
9 configurable inputs, hard-wired to deliver the same information to each AVR for the regulation modes,
ramp start, etc.
•
A set of 2 dedicated inputs on each AVR for manual switching between the two.
Each AVR has 4 operating modes:
•
Active
: The AVR is running and controlling the generator field current.
•
Online
: The AVR is ready and waiting, its regulation mode is the same as the active AVR. However, it is
not controlling the field current.
•
Maintenance
: The AVR has stopped, for example while waiting to be replaced.
•
Fault
: The AVR has stopped due to a fault.