Electric Power Generation
Installation and maintenance
5747 en - 2018.10 / a
Dual plate D700
21
4.3.4.3. Loss of sensing
Loss of voltage sensing on the machine is monitored throughout operation.
•
If loss of sensing is detected on the "active" AVR and not on the "online" AVR, the active AVR
switches to fault mode.
•
If loss of sensing is detected for both the "active" and "online" AVRs, then switching does not occur
(that may then come from the sensing VT).
Note: By default, no action has been programmed for loss of sensing. A significant bump may
therefore occur on switching to the "online" AVR. This bump may be less noticeable if the "field
current before fault" action has been selected.
Start
AVR 1 = active
AVR 2 = online
Loss of sensing on AVR 1?
Loss of sensing on AVR 2?
Yes
Yes
No
No
No switching:
loss of sensing signalled
by the AVRs
(if programmed)
Switching:
AVR 1 = fault
AVR 2 = active
Loss of sensing on AVR2?
Yes
No
Loss of sensing signalled
by the AVR
(if programmed)
No switching