Before the user can switch the AVR between the manual and automatic modes, they must name a
signal for this. The input selection at the function's
I/O
→
Input signal control
→
AVR to manual
control determines this. The signal can be a digital input, a logical signal or a programmable control
switch signal. If this kind of an external signal is used, it should be controlled to switch between the two
modes from SCADA instead of the AVR's own internal signal "Auto/Man". Controlling the external signal
with the internal signal can lead to conflicts between the two controls (SCADA and external signal
switching).
Switching between automatic and manual control modes remotely and locally
If the user wants to switch between the manual and automatic control modes remotely and locally, the
most practical way to do it is to use programmable control switch. Start by giving the switch a name
(eg. "AR") at
Control
→
Device I/O
→
Programmable control switch. Then go to Tools
→
Mimic
editor. Click where you want the switch to be in the mimic and choose "Programmable control switch"
from the library. Finally, set the programmable control signal from the list. You will find it listed under the
name given to it in the first step. Now, when the logic is loaded to the relay, it is possible to switch
between automatic and manual modes with the mimic switch and through a remote connection.
Controlling the voltage regulator remotely with IEC 61850
The automatic voltage regulator can also be controlled both locally and remotely with the IEC 61850
communication protocol. This requires that the voltage regulator is added to a dataset. Then the
regulator can be controlled at
VRG AVCO/TapChg/Oper. where "0" means "Stop", "1" means "Raise",
and "2" means "Lower".
Events and registers
The automatic voltage regulator function (abbreviated "VRG" in event block names) generates events
and registers from the status changes in internal pick-ups and other control events.
The function registers its operation into the last twelve (12) time-stamped registers. The events
triggered by the function are recorded with a time stamp and with process data values.
A
AQ
Q-T215
-T215
Instruction manual
Version: 2.04
286
