Dimensioning and Planing of Electrical Power Systems

We calculate AC short-circuit currents according to the IEC 60909 standard or DIN VDE 0102, respectively, for low, medium and high voltage systems. Besides AC systems, we also calculate DC short-circuit currents according to IEC 61660 standard for any voltage range. Therefore, we can develop and use customized models of the electrical equipment (e.g. special short-circuit behavior or current-voltage characteristics) for time or frequency domain simulations in our simulation tool.

We support our customers for adequate dimensioning of electrical equipment according to the respective standards, as e.g. the dimensioning of cables acc. to DIN VDE 0298, protection devices, current and voltage transformers, transformers, generators, switchgears, et cetera. Further, we can analyze the transient behavior of each device e.g. occuring at switching operations (transformer inrush, energizing of cables, starting of motors) or due to switching power supplies.

We work out load flow and power quality analysis which is adapted to our customers' needs. Studies can also have a focus as transients, motor start, transformer inrush or special studies of a interest of our customers.

We perform complete protection coordination studies. We consider all possible ANSI or IEC defined protection functions. We provide recommendations to guarantee selectivity, system stability and adequate protection of the equipment by selecting adequate voltage and current transformers, fuses, MCCBs, protection relays and their protection settings. Our scope regarding the protection coordination covers all voltage ranges from LV to HV for AC and DC systems.

We offer insulation co-ordination following the standard IEC 60071. We dimension surge arrestors and calculate fast and slow transient overvoltages to verify the insulation restistance.

We perform transient stability studies. There the power system stability is analyzed under switching operations or short-circuit conditions. In the analysis we consider all controller units in the power supply system, e.g. FACTS-based controllers, generator controllers or auto-transformers.

We calculate harmonics and their propagation and allocation in power systems. We perform calculations of THD, reactive power, and additional losses and loads caused by higher harmoncis.