ABB RELION REX640, Техническое руководство, Страница: 1572 / 1960

The length of the voltage raise and lower command pulse (tpU) and the pulse off
interval (tsU) are calculated based on the setting
Voltage match mode.
Voltage matching in manual mode
If
Auto Syn mode is set to "Manual mode", the voltage raise or lower command
pulses are generated manually from the function's user commands.
If the command
AVR voltage raise is set to "RAISE", the function activates the
voltage raise command pulse
RAISE_U
. If the command
AVR voltage lower is set to
"LOWER", the function activates the voltage lower command pulse
LOWER_U
.
The lengths of these generated pulses tpU and pulse off interval tsU are based on
the settings as: tpU =
Volt pulse Min Dur; tsU = Volt pulse off Intv.
Voltage matching with variable command pulse lengths
When the setting
Voltage match mode is set to "Variable Pulse", the voltage
matching is done with variable command pulse lengths.
The voltage matcher issues a command with a length proportional to the voltage
difference. The proportionality factor setting
Volt rate of change (dU/dt) can be
adapted to the voltage regulator. The voltage matcher aims at a value in the middle
of the set tolerance band.
The adjusting voltage command pulse length tpU is calculated as
tpU
U
U U
dU
dt
=
−
+ − −






∆
∆ ∆
max max
2
(Equation 360)
ΔU Measured voltage difference across the CB to be synchronized
+ΔUmax Setting
Voltage Diff Ov Ex
-ΔUmax Setting
Voltage Diff Un Ex
dU/dt Setting
Volt rate of change
The adjusting pulse is discontinued as soon as the voltage difference exceeds the
target value. The command length does not fall below a settable minimum value
Volt
pulse Min Dur. After an adjusting command, the system waits for the set Volt pulse
off Intv (tsU) so that the actual values can stabilize to the new set point.
Control functions 1MRS759142 F
1572 REX640
Technical Manual