Siemens 6MD85 Manual page 400

Control Functions
6.4 Synchronization Function
Parameter: T V pulse max
•
Default setting (_:133) T V pulse max = 1.00 s
With the parameter T V pulse max, you set the maximum time of the control pulse. The default setting is a
practicable value. This allows you to avoid overadjustment of the voltage in case of major voltage differences.
Parameter: dV per second
•
Default setting (_:134) dV per second = 2.00 V/s
With the parameter dV per second, you adjust the balancing commands to the controller. You can thus
correctly define the set point value. The duration of the control pulse is derived from the measured differential
voltage and from the setting value of the parameter. The default setting is a practicable value. Use the
following equation to estimate the actuating time.
[fo_voltage-adujsting-command, 1, en_US]
with:
dV
Measured value
dV per second
EXAMPLE:
The following values apply to the example:
Measured differential voltage
Parameter setting value
Use the following equation to estimate the duration of the balancing pulse:
[fo_du-dt_2v-s, 1, en_US]
The calculated duration of the setting pulse is 2 s. The setting value of the parameter (_:133) T V pulse
max limits the maximum duration of the setting pulse to 1 s. In this case, the value of 1 s applies.
Parameter: T pause V
•
Default setting (_:135) T pause V = 5.00 s
With the parameter T pause V, you set the dead time between the balancing commands. This allows the
controller or generator to respond to the control pulse. Determine the final setting value during commis-
sioning.
Parameter: Smoothing
•
Default setting (_:136) Smoothing = 1
The parameter Smoothing is used for additional smoothing of the
If the measured differential voltage
smoothing has low-pass behavior (PT1 behavior).
Figure 6-89 allows you to estimate the effect of the setting value of the parameter. The following figure
shows the step response. The longer the delay, the greater the smoothing effect.
400
Measured differential voltage
Parameter for specifying the speed of set point value change
dV = 4 V
dV per second = 2 V/s
dV fluctuates during commissioning, increase the default setting. The
dV voltage measured values.
SIPROTEC 5, High-Voltage Bay Controller, Manual
C53000-G5040-C015-9, Edition 11.2017