A detailed deduction of the mathematical procedure is not given within the context of this book, but only the final equations are quoted. In general, equipment in power systems is represented by equivalent circuits, which are designed for the individual tasks of power system analysis. For the calculation of no-load current and the no-load reactive power of a transformer, the no-load equivalent circuit is sufficient. Regarding the calculation of short-circuits, voltage drops and load characteristic a different equivalent circuit is required. The individual components of the equivalent circuits are resistance, inductive and capaci tive reactance (reactor and capacitor), voltage source and ideal transformer. Voltage and currents of the individual components and of the equivalent circuit are linked by Ohm's law.

Inspec keywords: short-circuit currents; power transformers; power systems; power apparatus; equivalent circuits

Other keywords: no-load equivalent circuit; capacitor; capacitive reactance; no-load current calculation; no-load reactive power calculation; reactor; voltage drops; ideal transformer; voltage source; inductive reactance; resistance; short-circuits; Ohm's law; power system analysis

Subjects: Power systems