### How can I adjust the tap positions of a 3-winding transformer during the simulation?

To change the tap position of a 3-winding transformer during a simulation define a parameter event (EvtParam) using the appropriate variable: e:nntap_int_h which corresponds to the tap-position HV…
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### How can I model a transformer with phase-shift tap changing to control active power flow?

This can be defined in the load-flow page of the transformer. The attached example shows how to use a phase-shift transformer to control the active power shared between several transformers…
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### How can I model two transformers controlling the same busbar voltage?

This can be modelled using a master-slave mode available in PowerFactory. First of all, both transformers shall have a type which includes settings for the tap changer. In addition, the…
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### How are the load and no-load losses of the network components calculated?

1. Lines:• Losses = P(terminal i) + P(terminal j)• Losses (no load) = U(terminal i)2* B1/2 + U(terminal j)2* B1/2 ,(B1 line susceptance C1,G1 . . . )• Losses (load) = Losses - Losses(no load) 2.…
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### Do you have a library with generic models for main transformers and generators?

Attached you can find a PowerFactory project containing several generic models for main transformers and generators.…
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### How can I model a transformer with different short circuit impedances per phase?

The attached example shows how to model an ideal 3-phase transformer, representing the influence of the delta winding in addition to three single phase transformers with different short…
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### What is the effect of a tap changer on the HV or LV transformer voltage?

Firstly, it is considered a transformer that has a tap changer on the HV side, with a voltage source of 100 V on the HV. If the tap is on the position where the primary turns are np=50 then the…
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### Can I enter a maximum tap position less than the minimum tap position?

This is possible by using a trick. Enter as the phase of the additional value an angle of phiu: phiu=180 degrees.…
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### Do you have an example how to model Line Drop Compensation?

The LDC is normally used in MV/LV radial networks to control the voltage at a remote end (by measuring the load current and compensating the voltage drop). A detailed explanation of the Line Drop…
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### How is the nominal current of a transformer calculated?

The nominal current rating for the transformer is calculated as follows:Inom(HV) = Snom / SQRT3 / Unom(HV) * ratfacInom(LV) = Snom / SQRT3 / Unom(LV) * ratfacUnom(HV) = rated HV voltage of the…
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