What is an auto transformer used for?

The primary purpose of an autotransformer is to regulate the voltage of transmission lines and can be used to transform voltages. With only one winding, an autotransformer adjusts the voltage automatically according to load.

What is the role of auto transformer in performing short circuit test?

Hence the short-circuit test of a transformer is used to determine copper losses in the transformer at full load. It is also used to obtain the parameters to approximate the equivalent circuit of a transformer.

Where are auto transformers used?

Some uses of autotransformers are discussed below.

• Testing an Electronic Device after Repairs.
• To Power Up an old amplifier or radio.
• Line Voltage Drop Compensation.
• Temperature Adjustment in Resistance-type Heater.
• Changing Speed of a Fan.
• Cutting Styrofoam.
• Unregulated DC Power Supply of High Current.

Why transformer is used in circuit?

Transformers are employed for widely varying purposes. For example, a transformer is often used to reduce the voltage of conventional power circuits to operate low-voltage devices and to raise the voltage from electric generators so that electric power can be transmitted over long distances.

Why SC test is performed on HV side?

SC test is conducted on HV side and the measuring instruments are also placed in the HV side & the LV side is shorted. The main reason for performing the SC test on the HV side is that the rated current will be low in HV side when compared to the rated current in LV side.

Why do we use the OC SC test?

The open circuit and short circuit test are performed for determining the parameter of the transformer like their efficiency, voltage regulation, circuit constant etc. These tests are performed without the actual loading and because of this reason the very less power is required for the test.

Which principle is used in transformer?

of electromagnetic induction
A transformer is basically an electromagnetic static equipment based on the principle of Faraday’s law of electromagnetic induction.

Does a transformer use AC or DC?

A transformer is a device which step-up or step-down the level of AC current or voltage without changing the primary (i.e. input source) frequency. Transformer only works on AC and can’t be operated on DC i.e. it has been designed to be operated only and only on alternating current and voltage.

What is the advantage of auto transformer?

The Autotransformer have many advantages over conventional double wound transformers. They are generally more efficient for the same VA rating, are smaller in size, and as they require less copper in their construction, their cost is less compared to double wound transformers of the same VA rating.

What is the difference between auto transformer and transformer?

Normal transformer consists of three pairs of winding used to transform a set of three-phase voltages from one voltage level to another while auto-transformer consists of a single electric winding, which can be used as a step-down or step-up device.

What is the voltage at the output of an auto transformer?

Auto transformer Theory and Design: However, the voltage at the output of the whole transformer is the sum of the voltage on the first winding and the voltage on the second winding. The first winding here is called the common winding, because its voltage appears on both sides of the transformer.

What is the use of open circuit test on transformer?

Therefore it is seen that the open circuit test on transformer is used to determine core losses in transformer and parameters of the shunt branch of the equivalent circuit of the transformer. The connection diagram for the short circuit test on the transformer is shown in the figure below.

What are the applications of an auto transformer?

Applications of Auto transformer. It is used as a starter to give upto 50 to 60\% of full voltage to the stator of a squirrel cage induction motor during starting. It is used to give a small boost to a distribution cable, to correct the voltage drop.

What are the different types of autotransformer?

Based on increasing & decreasing the voltage, autotransformer is divided into two types i.e. Step up transformer & step down transformer. Just like two winding transformers, a single autotransformer can be used in both configurations. Such kind of autotransformer’s output voltage exceeds its input voltage & vice versa for its current.