Potential Transformer
It is very important to manage and measure the Extra High Voltage level which we use to transfer power from one point to other. Since the insulation gradient for Extra High Voltage(EHV) is very high, it is difficult to measure this high voltage. So for the measurement its necessary to reduce the voltage level. Here we generate a reference voltage with respect to the EHV using a Voltage Transformer(VT) or Potential Transformer(PT). So we refer potential transformer as step-down transformers. Such types of transformers come under the classification of Instrument transformer. Potential Transformers are same as that of a power transformer, but they are used for the protection and measurement of the system voltage. Since its duty is just to measure the magnitude of voltage, its always connected in parallel to the Power lines supplying loads. We usually here the word Potential Transformers while working in a medium voltage switchgear room and substations, power s...