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. Multiple tapings from HV windings are brought to the OLTC chamber and connected to fixed contacts. Moving contacts rotates with the help of rotating mechanism usually a Geneva mechanism having a spindle. The spindle can be rotated manually as well as electrically with a motor. 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. This movement of contacts thus controls the output LV voltage of the transformer. So rotating of the OLTC contacts with spindle or push button in this way is manual process. In case this process of rotating the OLTC contacts and hence controlling the LV side voltage is to be done automatically then a RTCC (remote tap changer controller) is installed with the transformer ht panel. The RTCC panel which has sensors which sense the output voltage and accordingly sends signal to LCP and LCP in turns rotates the motor as per signal received from the RTCC.

Technical Specifications:

  • On-load tap changer to provide +7% to -21% taps in steps of 1.75%
  • 3 Phase, 50 Hz in voltages of 11 KV, 22 KV and 33 KV
  • Off-circuit tap changer to provide +5% to -10% taps in steps of 2.5%
  • Standard fitting as per IS: 2026 / IEC 76

Features

  • Design conforms to IS: 2026, BS 171, IEC 76 and other relevant standards
  • Latest manufacturing techniques to ensure cost effectiveness and reliability
  • Designed for 25 years of trouble – free performance
  • Very low power loss and low noise
  • Optimum utilization of active materials for sleek design Withstands electrical impulses, thermal and dynamic stresses

Most Suitable for

  • Tube Mills
  • Educational Institutions
  • Residential & Commercial
  • Telecom Centers
  • Cold Storage
  • Rice Mills
  • Clubs
  • Rolling Plants
  • Pharmaceuticals Units
  • Food Processing Units
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