Siemens SINAMICS S120 Manuale di ingegneria - Pagina 10

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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