TNSseries three phases high precision automatic voltage regulator ay pinagsama sa TND(SVC) single phase high precisiorautomatic voltage regulator, Tatlong phase adjust individual to guarantee steady safe voltage in per phase, The incoming powerof network is three phases four wires system, starlike (Y) connection, the output power can be made in three phases four wires oithree, phases the output three wires oithree, phases three wires out boltahe ng bawat phase sa pamamagitan ng aswitch at isang boltahe ng metro shift.