The difference between CT/PT
The difference between CT/PT : CT – Current Transformer & PT – Potential Transformer is measuring devices in AC system.
These are also called instrument transformers. As AC system deals with very high power hence we require Ammeter & voltmeter of humongous sizes to measure such high power which is impractical & expensive too.
Current Transformer (C.T) Details.
CT following properties:-
- it is an intensified transformer.
- It enhances the voltage & thus this gets reduced for a tough and fast power, since P= V×I×cosΦ. Thus for a tough and fast amount of power, current can easily be measured.
- the primary winding of a CT is typically connected serial with the load & secondary winding is connected with the ammeter.
PT has the following properties:-
- it’s the stepped-down transformer.
- It reduces the voltage for a tough and fast power & thus the voltage can easily be measured, since P= V×I×cosΦ
- the primary winding of the PT is typically connected in parallel to the load & the secondary winding is connected to the voltmeter.
parts of instrument
CT and PT form the subparts of the instrument transformer. They are extensively utilized in power systems for metering and protection purposes.
These 2 forms the foremost important neighborhood of any substation. Since in actual electrical power system, we affect high voltage and high current and it isn’t feasible and economical to manufacture devices to measure such high values. So to measure high values in the power system using CT and PT. the primary of
that transformer is placed in path and secondary is placed in any meter or relay relying on the appliance. The turns of primary and secondary are adjusted in such a fashion that this in secondary is small and easy to measure for CT and voltage just in case of PT. Also, they provide isolation between primary and secondary which is typically required in electrical.
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