Notes On Calculation Variants - Siemens SINAMICS S120 Engineering Manual
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1 Engineering SINAMICS S120 Booksize
1.3.3
Notes on calculation variants
Two calculation examples are shown below. One is used to dimension a matching
transformer, the other to check an existing line connection with transformer.
For a more precise calculation, data on cable lengths and cross-sections along with
the short-circuit power at the PCC (Point of Common Coupling) are required.
Wherever possible, typical quantities are specified in order to make a rough
estimate for typical constellations.
Additional factors that influence the line impedance, such as additional
transformers, are not taken into consideration in the following calculation examples.
However, when required, these can be simply supplemented corresponding to the
calculation formula applied.
Only a very simplified calculation is possible, especially if the cable length between
the transformer and Line Module and the short-circuit power of the medium-voltage
line supply (grid) are not known. However, it should be noted that for unfavorable
preconditions, calculated values can be substantially wrong, resulting in a negative
behavior in subsequent operation. As a consequence, it is recommended that in
these cases, typical values or worst-case values should be used in the calculation.
The calculation examples are provided with formula fields in which you can enter
your own values, therefore making calculations simple.
Carefully check the correctness of the calculation results. Incorrect or extreme
input values can lead to results that are not plausible.
Note
An extensive plausibility check of the values is not made.
Notes relating to the integrated calculation function
Using the marking function for formula fields, you can color-code the input and
output fields for required and optional data.
Input fields are written in bold and framed in red when the formula fields are
activated.
Fig. 1-4
Some input fields are in the form of drop-down list; however, you can still enter
your own values.
Output fields of the calculation are italicized, and have a gray background when the
formula fields are activated:
Fig. 1-5
It is possible that the use of formula fields and their color marking must first be
Note
activated in the appropriate program used to display pdf files.
Engineering manual S120 Booksize
Entry-ID: 109808992,
V1.0,
04/2022
10
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