Siemens SINAMICS S120 System Manual page 124

Commissioning
7.8 Commissioning of dynamic grid support
Example for monitoring the voltage dip
In the following example, the parameterization of a monitoring characteristic is shown for the
voltage according to the following diagram.
The individual characteristic required depends on the country-specific grid codes and the
specifications of the individual power utility company:
● After a voltage interruption of 200 ms, infeed operation must be maintained in the range
above the subsequent limit curve.
● In this example, a grid fault should be detected as soon as the grid voltage falls below 80
% of the rated voltage: p5550[1] = 80 %.
● The end of a fault ride through is detected if all line phase voltages lie within the threshold
values defined with p5550[0, 1] and p5550[2] for time p5545[3].
If the voltage falls below p5550[1] again, then a new characteristic monitoring process
starts at instant in time p5553[0]
Figure 7-8
The settings for the LVRT characteristic are described in the following table.
Table 7- 16
LVRT time values in s
p5553[0] = 0.00
p5553[1] = 0.20
p5553[2] = 0.20
p5553[3] = 0.70
p5553[4] = 0.70
p5553[5] = 1.50
p5553[6] = 2.98
p5553[7] = 2.99
p5553[8] = 3.00
p5553[9] = 3.01
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Example for voltage-time monitoring
Settings for the LVRT characteristic
LVRT voltage values in %
p5554[0] = 0.00
p5554[1] = 0.00
p5554[2] = 30.00
p5554[3] = 30.00
p5554[4] = 70.00
p5554[5] = 80.00
p5554[6] = 80.00
p5554[7] = 80.00
p5554[8] = 80.00
p5554[9] = 85.00
System Manual, 04/2015, A5E03347436A
Grid infeed