(a) Actual voltage outside the bandwidth
(b) Actual voltage before T1 elapses within the bandwidth - no switching
(c) Actual voltage outside the bandwidth, T1 begins to elapse
(d) Actual voltage outside the bandwidth after T1, switching procedure initiated
(e) Switching procedure concluded, actual voltage within the bandwidth
Linear, Inverse Control Response
With linear control response, the controller reacts independently of the control deviation after the set time T1
delay. If more than one tap-position change is required to bring the actual voltage back within the band-
width, the set time T2 delay takes effect.
With inverse control response, the time T1 delay depends on the magnitude of the control deviation. Small
deviations are tolerated for longer than larger ones. If the time delay is very small in accordance with the set
characteristic curve, the time T1 Inverse Min takes effect.
The set inverse characteristic curve is a function of the parameter T1 delay. The characteristic curves arising
for different settings of the time T1 delay are shown in chapter 8.9.4 Application and Setting Notes Voltage
Controllers, margin title Parameter: T1 characteristic.
Control Response with Zero Potential or Voltage Recovery
If the actual voltage is not within the defined bandwidth after a voltage recovery, it can be necessary for the
voltage controller to send the 1st adjusting command with the T2 time. For this purpose, the parameter
Regulate with T2 at start must be activated.
[dw_istgro-130215, 1, en_US]
Figure 8-105 Actual Voltage Curve during Control with T2
(1) Actual voltage below the minimum voltage
(2) After switching on, the change to a higher tap occurs with time T2
(3) After the voltage recovery, the actual voltage is above the bandwidth
(4) Actual voltage outside the bandwidth. A fast step down mode is carried out with the time T2 until
the bandwidth is reached.
Control Functions
8.9 Voltage Controller
1204 SIPROTEC 5, Overcurrent Protection, Manual
C53000-G5040-C017-8, Edition 07.2017
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