RTCC is “ Remote Tap Changer Control” Which is a programmable device to control the output of the transformer through OLTC unit fitted in the transformer through control cables. The desired Voltage will be achieved accordingly by controlling the OLTC with respect to the tap position through RTCC systems. The output voltage of the transformer is been maintained through an inbuilt AVR (Automatic Voltage Regulator) which continuously verifies the output power with the set / programmed reference voltage, which triggers the OLTC accordingly. Hence by above said phenomena, the consistency of the transformer output is been maintained.