Current limiting fuses can be modelled in PowerFactory, starting from the version 2025.

They are modelled using the already existing fuse model (RelFuse) and fuse type (TypFuse). The effect can only be investigated using the 'complete' method for Short-Circuit Calculation and only affects explicitly modelled fuses, not device modelled fuses. The IEC method is not supported.

It is necessary to firstly define the Let-Through Characteristic by enabling the same-name check-mark and filling out the table. This option can be found on the Let-Through Characteristic tab of the Basic Data page, within the fuse type (TypFuse).

Secondly it is important to enable the 'Consider current limiting effects' option on the Short-Circuit Complete page of the fuse element (RelFuse) and enter the desired R/X ratios.

When running the Short-Circuit Calculation command, it is necessary to enable the 'Current Iteration' option, on the 'Complete' page. A detailed explanation of the operating principle can be found in the corresponding Technical Reference, which can be accessed by pressing the F1 key while in the fuse element/type.

The attached project illustrates the effects of current limiting fuses. To analyse these effects, perform a short-circuit calculation on "All busbars" using the complete method to observe the difference in short-circuit currents and/or perform a dynamic EMT simulation with the short-circuit events already included in the project and analyse the results on the Plot page.