Potential Transformer

What is a potential transformer?

Potential transformer is a voltage step-down transformer which reduces the voltage of a high voltage circuit to a lower level for the purpose of measurement. These are connected across or parallel to the line which is to be monitored.

Type

Open and dry type

Pin identification

Primary (normally high voltage) winding on inner side and thin wires with high resistance.

Secondary (normally low voltage) winding normally on inner side with very low resistance.

Specification

Power range: 11kVA-132KVA

Voltage range: Any input and output voltage

Burden: 50VA-100VA

Frequency range: 50Hz, 60Hz, 50/60Hz & 400Hz

Phase: Single

Application

a. Potential transformers are used in the protecting relaying scheme because the potential coils of the protective device are not directly connected to the system in case of the high voltage. Therefore, it is necessary to step down the voltage and also to insulate the protective equipment from the primary circuit.

b. They are used for metering purpose, required for synchronization of feeders/generator with grid, for feedback of AVR, distance protection of feeders, impedance protection of generators and any protection which require voltage signal.

Note

Open and enclosed transformers with different IP ratings and mounting are available.

Identification

Available values in market

Availability by voltage ratio: 11KV/110V, 22KV/110V,33KV/110V,100KV/110V,132KV/111V



Potential Transformer

Potential Transformer

Potential transformers are used in the protecting relaying scheme because the potential coils of the..

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