# Transformer

The weight of conductor for any winding depends upon two parameters:Current carried by the windingNumber of turns required in the windingThus we can say that weight of conductor in a winding is directly proportional to its Ampere Turns i.e. MMF.Now, we will focus our attention on the weight of conductor ...
All Day Efficiency is defined as the ratio of total energy output for 24 hrs i.e. for the whole day to the total energy input for the same day. All Day Efficiency is basically Energy Efficiency of Transformer calculated for a period of 24 hrs. Mathematically we can write, All ...
A Transformer, in which a part of the winding is common to both the Primary and Secondary circuit is called an Auto Transformer. It shall be noted that in Two Winding Transformer, Primary and Secondary windings are electrically isolated but in Auto Transformer, the two windings are not electrically isolated.A ...
BDV test means Breakdown Voltage Test. It is done for checking the dielectric strength of the oil of the Transformer. Dielectric strength means the maximum capacity to withstand voltage of insulating oil. This test shows the dielectric strength of Transformer oil.In transformer oil has mainly two purposes, first for insulation, ...
Buchholz relay is a gas actuated protection relay which is generally used in large oil immersed transformers of rating more than 500 kVA. It is used for the protection of a Transformer from the faults occurring inside the transformer. A typical Buchhloz Relay is shown below.The gas actuated protective relay ...
The modern loads are designed to operate at satisfactorily at one voltage level. It is therefore of great importance to keep the consumers terminal voltage within a prescribed limits. The Transformers output voltage and hence the terminal voltage of the consumer can be controlled by using tap either on primary ...
Faraday’s Law of Electromagnetic Induction states that whenever there is a change in the flux linking through a coil, an emf is developed in the coil. Thus for production of emf, flux linking through the coil must change but for the flow of current through the coil, the circuit must ...
Transformer Phasor Diagram ...
Isolation Transformer:An isolation transformer is a Transformer used to transfer electrical power from a source of alternating current (AC) power to some equipment or device while isolating the powered device from the power source, usually for safety reasons. Isolation Transformers provide galvanic isolation and are used to protect against electric ...
The main and basic difference between a Power transformer and a Distribution Transformer is that Power transformers are used in transmission network of higher voltages for step-up and step down application like 400 kV, 200 kV, 110 kV, 66 kV, 33kV and are generally rated above 200 MVA.Distribution transformers are ...