Abstract:
In th early years of Electrical Engineering power systems were designed according to the requirements
of regular sustained operation. However, experience showed that with switching processes in the circuits and under similar intentional or accidental conditions peculiar phenomeni
appeared which could greatly disturb the regular operation of the system.,
In this work, the unintentional transient phenomena which consists of ground faults, short circuits and break of
conductors have been studied. Such accidents nearly always head to severe disturbances throughout the electric system
giving rise to high excess currents or voltages and sometimes currents of different frequency or entirely distorted wave
shape.
When considering in substance the various transient p:aenomena the mathematical methods must be applied: in the present investigation an attempt has been made to use the simplest possible mathematical tools compatible With the individual problem essentially with the elements of differen-tial and integral equations with the sequence
