The voltage controller measures the actual voltage (Vact) and compares it to the target voltage (Vtarget). If
the difference between the measured voltage (control deviation D) is greater than the set bandwidth (B), a
higher or lower command is sent to the tap changer once the set time delay (T1) has elapsed.
You can change the settings for control during operation with the settings group switching.
You can switchover the settings groups via the following alternatives:
•
Via the on-site operation panel directly on the device
•
Via an online DIGSI connection to the device
•
Via binary inputs
•
Via a communication connection to substation automation technology (IEC 60870-5-103, IEC 61850)
You can find more information in chapter 3.10.2 Settings-Group Switching.
Control Deviation
The control deviation is calculated from the present actual voltage and the target voltage in relation to the
rated voltage.
[fokonisk-211013, 2, en_US]
D = Control deviation
Bandwidth
To minimize the number of switching operations by the tap changer, a permitted bandwidth is defined. If the
actual voltage is within the bandwidth, no adjusting control commands are issued to the tap changer. If the
actual voltage exceeds the defined bandwidth, an adjusting command is issued after the set time delay T1
delay. If the actual voltage returns to the voltage range of the bandwidth before T1 delay elapses, no
adjusting control command is issued.
If the actual voltage returns to the voltage range of the bandwidth within the time delay T1, the running time
delay T1 continues to count down, starting at the already elapsed time. If the actual voltage returns again to
the set bandwidth while the time is counting down, the time delay T1 is started at the remaining time. In this
way, the time delay is reduced in the event of frequent violations of the lower limit of the bandwidth.
[dwistspn-060913-01.vsd, 1, en_US]
Figure 8-104 Actual Voltage Curve during Control Deviation
Control Functions
8.9 Voltage Controller
SIPROTEC 5, Overcurrent Protection, Manual 1203
C53000-G5040-C017-8, Edition 07.2017
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