Siemens 6MD85, Manual

Page: 401 / 1256

[dw_characteristic-adjusting-com, 1, en_US]
Figure 6-89 Effect of Smoothing Depending on the Set Parameter
Parameter: (V/Vrated)/(f/frated)
•
Default setting
(_:137) (V/Vrated)/(f/frated)
=
1.10
With the parameter
(V/Vrated)/(f/frated)
, you specify the overexcitation threshold.
The default setting is a typical value. Note that the thresholds refer to primary voltages. You can also easily
calculate with secondary values, as the voltage transformers are usually exactly adjusted to the rated voltage
of the plant. In case of deviations, you must correct the default setting.
EXAMPLE:
Permissible value (V/V
rated
)/(f/f
rated
) 1.1
Primary rated voltage of the generator V
prim
= 10.5 kV
Primary voltage of the voltage transformer V
prim, trans.
= 10 kV
This results in the following secondary setting value:
[fo_v-rated_the_generator, 1, en_US]
Parameters for Balancing Commands used to Control the Frequency
The following parameters are used as balancing commands to control the frequency:
•
Balancing frequency f2
•
T f pulse min
•
T f pulse max
•
df/dt of the controller
•
T pause f
Control Functions
6.4 Synchronization Function
SIPROTEC 5, High-Voltage Bay Controller, Manual 401
C53000-G5040-C015-9, Edition 11.2017