# DIgSILENT

## Knowledge base

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### How can I visualise if a cable is overloaded during the short-circuit?

Make sure that the used type of the cable or overhead line contains the correct value for the "Rated Short- Time (1s) Current (Conductor)" parameter in the Short-Circuit tab. The default value is 0,…

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### How are the pre-fault voltages for the different Short-Circuit analysis methods determinated?

Pre-fault voltage is determined by a factor called the c-factor, which is a multiplication factor that is multiplied by the nominal p.u. voltage to arrive at a pre-fault voltage. In the IEC…

### How to calculate a single phase to ground Short Circuit throught a protective earth wire?

There are two ways to calculate this kind of fault: Use a 4-wire model in which the N-conductor is explicitly modelled and the PE-wire is reduced and modelled as earth. Then when calculate a phase to…

### How is the verification of the thermal equivalent Short-Cirtuit current done in PowerFactory?

The calculation results for the admissible thermal equivalent short-circuit current are the following values:- Ithr: rated thermal Short-Circuit current with respect to 1 second (entered in the type…

### Why are the results of Short-Citcuit calculation depending on Max. Voltage Tolerance?

The new VDE/IEC standard distinguishes between low-voltage networks with 6% and 10% of voltage tolerance.For networks with a tolerance of 6% cmin and cmax are set according with IEC 60909-0:2001 Page…

### Why are the results for Short Circuit calculation different depending on "Power Station Unit Detection" option?

According to VDE/IEC in standard system fed directly from generators without transformer units, the impedance defined in following equation has to be used. Z_G = K_G x (R_G + j X_d") With the…

### Is it possible to calculate faults between lines at different voltage level?

PowerFactory allows to calculate faults between lines at different voltages, that means in general faults between different circuit phases through a definition of a "Intercircuit Fault".To do it,…

### Do you have an example of a Unified Power Flow Controller (UPFC)?

An UPFC (Unified Power Flow Controller) is a FACTS (Flexible AC Transmission System) device, which consists of two VSCs (Voltage-Sourced Converters). The VSCs are interconnected with each other on…

### How can the calculation of fault current along a line be automised?

With the short-circuit sweep command it is possible to calculate Short-Circuits along a path.Therefore it is necessary to define a Path (SetPath) and a Short-Circuit Sweep command (ComShcsweep) along…

### How to set up a model of HV grid as an external grid for Short-Circuit calculation?

When entering the data for an external network you should firstly be aware of the meaning of Minimum and Maximum current calculations.The Data for the external grid comprise: The fault level may be…

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