Three Phase Transformers

Three Phase Transformers For Generation of electrical power three-phase alternators are employed at the power generating station. Usually large power is generated at high voltage. Transmission is generally accomplished at higher voltage of 132KV, 220KV, 400KV, and 765KV. For which purpose 3-phase transformers are necessary to step up the generated voltage to that of the […]

EMF Equation for Transformer

EMF Equation for Transformer For drive an emf equation for transformer we will consider the case of an ideal transformer. An ideal transformer one which have no copper loss(I2R losses) and magnetic leakage flux. In other words, we can say that an ideal transformer consists of windings which have zero ohmic resistance and loss-free core. […]

Transformer on Load

Transformer on Load When some load is connected across the secondary of the transformer, then it is said to be transformer on load. The current I2 flows through load and secondary winding. The magnitude of current I2 depends upon the terminal voltage V2 and impedance of load. The angle between current I2 and voltage V2 […]

Transformer Tests

Transformer Tests Transformer tests ( such as Open circuit and short circuit test ) are performed to determine the transformer circuit parameter (RO and XO), efficiency and voltage regulation. Without actually loading the transformer, there tests are very convenient and economical. Open Circuit Test Open circuit test is conduct to determine the core loss, Pi […]


Transformer The Transformer is a static device that transfers electrical energy from one electrical circuit to another electrical circuit without change in the frequency but voltage level is usually changed. It may be stepup or step down transformer. The transformer has two winding one is called primary winding and other is called secondary winding. The […]

Cooling of Transformers

Cooling of Transformers When transformer is connected to the supply, some heat is always produced due copper losses (or I2 R losses) and core losses (iron losses). The output of the transformer limited by the rise in temperature. So, there becomes a necessity to cool down the transformer for their normal operation. The cooling of […]

Autotransformer | Construction Advantage and Application

Working or Operating Principle and Construction of Autotransformer The operating principle of autotransformer is same as two winding transformer. It  is one winding transformer i.e. the primary and secondary windings are inter-related.The construction of autotransformer is totally differ from conventional two winding transformer. It is a single winding transformer which is common for primary and […]