Dark Lamp Method of Synchronizing An Alternator with the Bus Bar.


  •     In this method, the lamps are directly connected across synchronizing switch as shown is fig.

  •     The voltages and frequencies of both the systems are made equal.

  •     The incoming machine frequency is slightly altered deliberately. Assuming the phase sequences are the same the three lamps will be dark or bright together.

  •     The lamp will be dark below a certain voltage. If the dark period is judged and switch is closed at the middle of the dark period, the machines are synchronized.

  •     Since the phasor will be in phase (fig). If the phase sequence is wrong, one lamp will be dark and the other two will be bright and vice versa

    •      In that case, any two leads are interchanged.


    •     In this method, the lamps are connected asymmetrically as shown (fig).
    •      If the phase sequence is correct, the lamps brighten and grow dim in sequence.
    •     Two sets of star vectors will rotate at unequal speeds if the frequencies of the two machines are different (fig.).
    •     Synchronization is done at the moment the uncrossed lamp L1 is in the middle of the dark period.  When the uncrossed lamp L1 is dark, then other two crossed lamps L2&L3 are dimly but equally bright.
               This method of synchronizing is known as 'two bright and one dark


    1. i think this content is more benefit to the visitors , please post comments if u like this post. "Thank You"

    2. Why two lamps in series are being used instead of one lamp for a phase?

    3. BHAAI lamps connected across line..440volt. Lamp normal working volatge is 220v single lamp ur jayega. thats why 2 in series.

    4. These are 3-phase alternators naaa

    5. How do we check if the frequency of incoming machine is greater or less than the bus bar frequency?



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