Q&A

What is the relation between primary voltage and secondary voltage?

What is the relation between primary voltage and secondary voltage?

Thus, when a transformer steps-up a voltage, it steps-down the current and vice-versa, so that the output power is always at the same value as the input power. Then we can say that primary power equals secondary power, ( PP = PS ).

What are the two types of transformer depending upon the position of the primary and secondary coils on the core?

Depends upon the voltage ratios from primary to secondary windings, the transformers are classified as step-up and step-down transformers.

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Which side of a transformer has a higher resistance?

The high voltage winding will have more turns using a smaller cross section wire. This makes it the longest of the windings and the one with the highest resistance. The HV winding will have higher resistance, irrespective of whether it is used as a step up or step down transformer.

What is step up and step down?

A transformer that increases the voltage from primary to secondary (more secondary winding turns than primary winding turns) is called a step-up transformer. Conversely, a transformer designed to do just the opposite is called a step-down transformer.

What is the difference between step up transformer and step down?

A transformer designed to increase the voltage from primary to secondary is called a step-up transformer. A transformer designed to reduce the voltage from primary to secondary is called a step-down transformer.

What is the significance of primary resistance of transformer?

The main purpose of this test is to check for gross differences between windings and for opens in the connections. Measuring the resistance of transformer windings assures that each circuit is wired properly and that all connections are tight.

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How to draw equivalent circuit of transformer referred to primary side?

For drawing equivalent circuit of transformer referred to primary, first we have to establish general equivalent circuit of transformer then, we will modify it for referring from primary side. For doing this, first we need to recall the complete vector diagram of a transformer which is shown in the figure below.

What is secondary voltage drop in a transformer?

The voltage drop occurring in the secondary winding of a transformer when the transformer is loaded fully. In your case, there will be a voltage drop of 12.4\% from no-load secondary winding terminal voltage when the transformer supplies 55MVA.

What is the total primary current of a transformer?

From the vector diagram above, it is found that the total primary current I 1 has two components, one is no – load component I o and the other is load component I 2 ′. As this primary current has two components or branches, so there must be a parallel path with primary winding of transformer.

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What are the factors affecting the performance of a transformer?

The percentage of primary voltage when applied to the primary winding of the transformer will result in full load secondary winding current with the secondary winding terminals short-circuited. The short circuit capacity of the transformer.