Abstract :
Continuity distribution of electric energi from the plant to the consumer cannot be
guaranteed to be available at alltimes.this is due the presence of possible
disturbances which occurred in the center of the plant,tranmission line and
distribusion channels .so for connsumers who need the assurance of the avaibility
of electric energy supply is required at all times need emergency suplly (Genset)
that have anough capacity to bear all the burden at the vanue when the supply
was cut off from the network,This research resulted in Automatic Transfer Switch
(ATS.) will be ordered for the starting of genset when the main supply (PLN) is
disconnected or disrupted,which can be observed from the value of the voltage
that does not meed standard set by PLN and load supply is taken over by the
genset.and when the main supply PLN back to normal than back to load supllies
taken over by PLN .the trial got that there are a pause the time between supply
PLN disconnected until Generator flared and ready burdened as that 0f 8
seconds. And obtained a pause the time between supply PLN back normally up to
suplly Generator terminatated and supplies burden back taken over PLN as that
of 10 seconds.