Oltc Distribution Transformer

  • Multiple tapings from HV winding are brought to the OLTC chamber and connected to fixed contacts; moving contacts rotate with the help of rotating mechanism, usually a Geneva mechanism having a spindle.
  • On-load tap changer (OLTC) is used with higher capacity transformers where HT-side voltage variation is frequent and a nearly constant LT voltage is required. OLTC is coupled with the transformer itself.
  • The spindle can be rotated manually as well as electrically with a motor; the motor is connected in such a way that it can rotate in both the directions such as to rotate the OLTC moving contacts clockwise and anti-clockwise.
  • Two push buttons are fitted on the LCP (low control panel) to rotate the motor and hence the OLTC contacts which controls the output LV voltage of the transformer.
  • An RTCC (remote tap changer controller) is installed with the transformer hot panel for automatic operations.

 

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