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What is OLTC in a transformer, specify its fuction.
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Answer Posted / raj lahare
Dear Dnyaneshwar, Please mote that 1)In HV transformers the LV winding is nearer to core and the HV winding is away from Core There fore it is easy for taking the taps .2) The current in HV being lower the switching current in OLTC is low.
Please note. 3)The RTCC means the Remote Tap Change Control Cubical This is installed in Control Room so that the Taps of the Transformer which is installed in Switch Yard can be changed from the Control room only. 4)The RTCC if provided with AVRCR then the taps are changed automatically by sensing the LV voltage. The AVRCR means AUTOMATIC VOLTAGE CORRECTION RELAY. 5) In bigger transformers say Voltage class 220 KV and above the OLTC tap connections are provided on LV side due to the insulation levels of high voltages at the switch.
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