Siemens SINAMICS S120 Engineering Manual - Page 29

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2 Examples and tips

2.2

Operation on a generator

How can I estimate the relative line short-circuit power when directly operated on a

generator?

As the ohmic resistance of the generator when compared to the inductive resistance is

very low, it can be neglected for the calculation.

As a consequence, the calculation is only made with the relative subtransient reactance

of the generator ''

For a simplified calculation, the following applies for the generator impedance:

With the formulas used in Chapter

over for the line short-circuit power at connection point IPC as follows:

The relative short-circuit power at the connection point IPC is therefore:

How can I estimate the relative line short-circuit power when operated on a generator via a

matching transformer?

Also here, the relative subtransient reactance of the generator ''

For the calculation, the following applies for the generator impedance:

With the formula for the generator impedance and the other formulas used in Chapter

"1.3.4.3

Calculations", the short-circuit power at connection point IPC is as follows:

The relative short-circuit power at the connection point IPC is therefore:

Engineering manual S120 Booksize

Entry ID: 109808992,

V1.0,

−

04/2022

"1.3.4.3

Calculations", the formula can be switched

1.1

√ 3 ∙

∙

1.1

ℎ

√ 3 ∙

∙

is required.

−