Electrical Engineering ⇒ Topic : Advantages of Star Connection
Advantages of Star Connection
(1) In star connection, phase voltage Vph = VL/√3 Since the induced e.m.f. in the phase winding of an alternator is directly proportional to the number of turns, a star-connected alternator will require less number of turns than a A-connected alternator for the same line voltage.
(2) For the same line voltage, a star-connected alternator requires less insulation than a delta-connected alternator.
Due to above two reasons, 3-phase alternators are generally star-connected. One can hardly find *delta-connected alternators.
(3) In star connection, we can get 3-phase, 4-wire system. This permits to use two voltages viz,phase voltages as well as line voltages. Remember that in star connection, VL =√3 EphSingle phase loads (e.g. lights etc) can be connected between any one line and the neutral wire while the 3-phase loads (e.g. 3-phase motors) can be put across the three lines. Such a flexibility is not available in A-connection.
(4) In star connection, the neutral point can be earthed. Such a measure offers many advantages.For example, in case of line to earth fault, the insulators have to bear 1/√3 (i.e. 57.7%) times the line voltage. Moreover, earthing of neutral permits to use protective devices (e.g. relays) to protect the system in case of ground faults.
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