**Contents**show

## What is transformer bobbin?

At the heart of a transformer is the bobbin or **coil**. **former that serves as its winding and termination platform**. The bobbin or coil former supports the winding, aligns the cores, channels the winding and provides a termination and connection method.

## What is perimeter of bobbin?

Perimeter of bobbin = 1.75 x 4 = **7 inch**.

## What is the difference between a bobbin and a spool?

As nouns the difference between spool and bobbin

is that **spool is a device around which thread, wire or cable is wound**, especially a cylinder or spindle or spool can be a small swimming pool that can be used also as a spa while bobbin is a spool or cylinder around which wire is coiled.

## What are the losses in a transformer?

These power losses end up as heat that must be removed from the transformer. The four main types of loss are **resistive loss, eddy currents, hysteresis, and flux loss**.

## What is the basic principle of a transformer?

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

## What are the two main types of transformers?

There are two types of potential transformers; **the conventional wound type (or electromagnetic type) and the capacitor voltage (potential) transformer**. For voltages exceeding 100 kV (phase) the conventional type of potential transformer becomes extremely expensive owing to the insulation requirements.

## How do you calculate the number of turns in a transformer?

Windings and Wire

You now need to determine the number of turns that will be required for each secondary winding. The first step is to use **formula 3 (N(s) = V(s) / V(p) x N(p))** to determine the turns for a perfect transformer. This number then needs to be increased to account for the losses in the coils.

## How do you calculate the weight of a transformer?

Calculating Weight**The transformer’s capacity in kilovolt amperes (kVA) multiplied by the basic impulse insulation level (BIL)** gives the transformer’s weight estimation. Both known values are readily available for each transformer, making the calculation universal for all units.

## How do you determine the power rating of a transformer?

Use the formula: **P(KVA) = (V^2/R)/1000 where R is resistance in ohms**. For example, if V is 120 volts and R is 50 ohms, P(KVA) = V^2/R/1000 = (14400/50)/1000 = 288/1000 = 0.288 KVA. Calculate power rating in KVA when you know power in watts and the power factor.

## How do you find the primary turn of a transformer?

According to Faraday’s Law, you can calculate the voltage induced in the primary or secondary windings of the transformer by calculating **N x dΦ/dt**. This also explains why the transformer turns ratio of the voltage of one part of the transformer to the other is equal to the number of coils of one to the other.