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# Transformer

## Transformer Phasing: The Dot Notation and Dot Convention

Transformer Phasing: The Dot Notation and Dot Convention The Dot Notation Generally, when we study about Transformers, we assume that the primary and secondary voltage and currents are in phase. But, such is not always the case. In Transformer, The phase relation between primary and secondary currents and voltages depends on how each winding is wrapped around the core. Refer …

## Transformer Efficiency, All day Efficiency & Condition for Maximum Efficiency

Transformer Efficiency, All day Efficiency & Condition for maximum Efficiency Efficiency of Transformer Transformer efficiency may be defined as the ratio between Output and Input. Efficiency = Output/Input On specified Power factor and load, the Transformer efficiency can be found by dividing its output on Input (Similar to other Electrical Machines i.e. motors, generators etc). But the values of both …

## Transformer Library

Transformer Library Transformer Working principle of a transformer Ideal Transformer Induction law ( For Transformer) Ideal power equation of the Transformer E.M.F Equation of the Transformer Energy Losses in Transformer Why Transformer Rating In kVA, Not in KW? Transformer Regulation With Example.  Transformer Efficiency, All day Efficiency & Condition for Maximum Efficiency Advantages and Disadvantages of Three Phase Transformer over …

## How to Calculate/Find the Rating of Transformer in kVA (Single Phase and Three Phase)?

Calculate & Find the Rating of Single Phase & Three Phase Transformers in kVA We know that, Transformer always rated in kVA.  Below are the two simple formulas to find the rating of Single phase and Three phase Transformers. Find Rating of Single Phase Transformer Rating of Single Phase Transformer: P = V x I. Rating of a single phase …

## Transformers MCQs With Explanatory Answers

Transformers (MCQs With Explanatory Answers) 1. A Transformer is designed to be operated on both 50 & 60 Hz frequency.For the Same rating, which one will give more out put; when,  Operates on 50 Hz  Operates on 60 Hz 2. In a Transformer , The primary flux is always _________ the secondary ( flux). Greater then Smaller then Equal Equal …

## In inductive circuit, Why Current increases, when frequency Decreases?

In inductive circuit, Why frequency increases, when Current Decreases? OR Explain that “In inductive circuit, when frequency increases,The circuit Current Decreases” Explanatory Answer: Click images to enlarge dir=”ltr” style=”text-align: left;”>

## What is the normal or average life expectancy of a Transformer ?

When a Transformer is operated under ANSI / IEEE basic loading conditions (ANSI C57.96), its normal lifeexpectancy is about 20 years. The ANSI / IEEE basic loading conditions for Transformer are: i. The Transformer is continuously loaded at rated kVA (kilo Volt Ampere) and rated Voltages (Transformer must be operated at the rated Voltage and kVA) ii. The average temperature of the …

## Why Flux in Primary and Secondary Winding of the Transformer is Same? With a Simple Explanation and Example.

Is Flux in Primary Winding always greater than the Secondary winding in Transformer? Ans: Flux in Primary and Secondary Winding is always equal. In ideal case, the flux produced in Primary winding will pass through the secondary winding, so generated flux in primary winding will be same as in secondary winding. Here is a very simple example to explain …