Your search returned 353 items.

### Do you have an explanation of the parameters 'rs(f)' and 'I''(f)' of the synchronous machine?

With these parameters you can specify a frequency characteristic for r and l” (subtransient inductance) for consideringskin effect and the variation of the internal inductance. Relevant for harmonics…
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### What does the option 'Consider transient parameters' of the synchronous machine do?

This flag indicates if the machine reactance should be calculated using all transient parameters (xdss, xds, xd, Tdss, Tds), or if just the subtransient reactance should be used for harmonics. There…
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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-Circuit 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…
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