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Transformer

What is Vector Group of Transformer- Explanation

The vector group of transformer shows the phase difference between the primary and secondary sides of the transformer. There are different ways in which transformer high voltage and low voltage winding is connected. On the basis of HV and LV winding connections, the vector grouping of the transformer is classified. The three-phase transformers are divided […]

Back to Back test of Transformer (Sumpners Test) Procedure

The efficiency and regulation of the transformer can be calculated using open circuit and short circuit test on the transformer but to measure temperature rise during operation, it is necessary to conduct a full load test on the transformer. for low power small transformer, a full load test can be performed directly by loading. but […]

What is Current Transformer-Working, Construction, Type

The current transformer (CT) is a type of instrument transformer designed to measure high-value current in the power system. The primary has few numbers of the turn of heavy wire, and the secondary of the current transformer has many turns of fine wire. Current Transformers are mainly used to perform two tasks. Primarily to step down […]

Buchholz Relay-Working, Construction, Application, Diagram, Advantages

Buchholz relay is a mechanically operated relay that is used to protect the transformer from internal faults that occur inside the transformer tank like an inter-turn fault. Buchholz relay is an oil and gas-operated device. The function of this relay to give an alarm in case of an incipient fault in the transformer and to disconnect […]

EMF Equation of Transformer and Voltage Turn Ratio

Consider an AC voltage of magnitude “V” having frequency “f” is applied to the primary side of the transformer. ac flux Φm is set up in the transformer core, this flux links with the both primary and secondary winding of the transformer. the value of induced emf can be calculated using EMF equation of the transformer, also […]

Open Circuit Test and Short Circuit Test on Transformer( SC/OC)

Mainly two tests carried out on the electrical transformer that are open circuit and short circuit test of the transformer also known as SC and OC test. The purpose of these tests is to determine the parameter of the equivalent circuit, voltage regulation and efficiency of the single / three-phase transformer. this is the main reason for […]

Transformer Polarity test, Additive, Subtractive ,Procedure,diagram

The transformer is the main device of the transmission and distribution network hence its reliability is important in every aspect. The transformer must be able to deliver the required power to load. single transformer unit is used for distribution purposes but in some cases, more than one transformer is connected in parallel to obtain the […]

Difference between Current Transformer (CT) and Potential Transformer (PT)

Difference between Current Transformer (CT) and Potential Transformer (PT) Current Transformers (CT) and Potential Transformers (PT) are used to measure the current and voltage in a circuit of the order of hundreds of amperes and volts respectively. A CT has a large number of turns on its secondary winding, but very few turns on its […]