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Transformer Riddle No. 59 – Safety feature in OLTC

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  • #690
    Sinnadurai Sripadmanaban

      When an OLTC is mounted accidentally in such a way that the tap position (say 4)indicated on top of OLTC do not match with that(say 3) shown in the motor drive when…
      When an OLTC is mounted accidentally in such a way that the tap position (say 4)indicated on top of OLTC do not match with that(say 3) shown in the motor drive when operated manually or automatically by AVR if the maximum tap is surpassed will the tap changer become defective or there are safety mechanisms at either end(min and max taps) to prevent damage?.

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    • #2428
      Hamid

        Many advances have been made in the design of control circuits associated with on-load tap changing. Mention has already been made of driving mechanisms and the fundamental circuits associated with the starting of the motor for carrying out a tap change. While these vary from one maker to another they are comparatively simple. In general, the motor is run up in one direction for a

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