Static Calculations

Power Flow

Are fuses and their rated current considered during a power flow simulation?

Yes, the fuse loading is an output of the power flow simulation. It is based on the fuse's current rating that can be defined in the component library. The fuse's current-time characteristic, however, is only considered in the protection calculation.

Short Circuit

How are the short circuit parameters of the Feeders in the low voltage grid determined?

The parameters are determined by running a short circuit calculation in the MV grid (three-phase fault). The resulting short circuit powers (min and max) on the primary side of the transformers are then taken as min/max short circuit powers of the feeders in the LV grids.

Which fallback parameters are used for the Short Circuit Calculation?

The following fallback parameters are used for the Network Feeders and Transformers when running a Short Circuit Calculation:

Network Feeder

Voltage range [kV]	$S_{k{Q}_{min}}^{″}$ [MVA]	$S_{k{Q}_{max}}^{″}$ [MVA]	$\frac{X}{R}$
$0\le v\le 1$	1	10	1
$1<v\le 60$	550	550	1
$60<v\le 200$	5000	7500	4
$200<v\le 300$	15000	25000	6.5
else	50000	50000	9

Transformer

• Vector group: Dyn5
• Star point grounding: Direct grounding

Hosting Capacity

Why does the hosting capacity calculation show 0 hosting capacity at all nodes?

The reason is that the base load/generation scenario in the grid where the hosting capacity is being calculated already leads to violations of the operational limits (voltage change, absolute voltage, line loading, transformer loading or fuse loading). As such no additional load/generation can be added. Run a power flow on the affected grid and check for any violations of the operational limits with the base load/generation distribution. Often the limiting factor is the voltage change parameter, depending on the option Consider existing load and generation.