What is potential transformer

Instrument transformers are high accuracy class electrical devices used to isolate or transform voltage or current levels. The most common usage of instrument transformers is to operate instruments or metering from high voltage or high current circuits, safely isolating secondary control circuitry from the high voltages or . Primary of this transformer is connected across the phase and ground. Just like the transformer used for stepping down purpose, potential transformer i. PT has lower turns winding at its secondary.

The potential transformer is connected in parallel with the circuit.

The primary windings of the potential transformer are directly connected to the power circuit .

One of the major difference between them is that the current transformer convert the high value of current into low value whereas the potential or voltage transformer convert the high value of voltages into low voltage. Some other differences between the current and the potential transformer are explained below in the the . This is because measuring meters or instruments and protective relays are low . T can not be open circuited on any circumstance when it is under service. T is independent of the secondary circuit condit.

Reduce current by current transformer. Electrical instrument transformers transform high currents and voltages to standardized low and easily measurable values that are isolated from the high voltage. When used for metering purposes, instrument transformers provide voltage or current signals that are very accurate representations of the. Potential Transformer (PT) control . Current Transformer and Potential Transformer (Hindi) - Duration: 6:32.

The secondary voltage is substantially proportional to the primary voltage and differs from it in phase by an angle that is approximately zero. Instrument Transformers How will you measure AC currents and voltages of very high magnitude? You will need the measuring instruments having higher range, which literally mean huge instruments. The original magnitude can be determined by just multiplying the result with the transformation ratio.

Such specially constructed transformers . Potential transformer working principle, how voltage control transformer works concept is explained in this video tutorial. A general overview of ABB's current and voltage transformers. Voltage ratio calibration for .