What is NP and NS in transformer?

In a transformer Np / Ns is called the voltage ratio. If Ns is less than Np then Vs is less than Vp. This is called a step-down transformer as the voltage is reduced. If Ns is greater than Np then Vs is greater than Vp. The voltage from primary to secondary increases and this is called a step-up transformer.

How do you calculate NS NP?

For Vs Vp the ratio of the turns is from equation (1) tells us that Ns Np. (2) Ip Is = Ns Np So the current is inversely proportional to the number of turns. r So for example, if Vp=120 volts the equation (4) tells us that Vs=120/2=60 volts.

What is EP and ES in transformer?

Transformer Turn Numbers

Es = Secondary Voltage, Ep = Primary Voltage, Ns = Number of secondary turns, Np = Number of Primary turns.

What is the ratio of EP to ES in a transformer?

ES/Ep = Ns/Np =K ——–(7)

If the secondary turns are more than the primary turns, the secondary voltage will be higher than the primary voltage and the turns ratio (K) is greater than 1. The transformer having voltage transformation ratio more than 1 is called step up transformer.

What is N1 and N2 in transformer?

In Step-Down Transformer, The number of turns (N1) in the primary coil is greater than the number of turns (N2) in the secondary coil. In Step-Up Transformer, the number of turns (N2) in the secondary coil is greater than the number of turns (N1) in the primary coil.

The transformer equation VpVs=NpNs

What is VA burden of PT?

The burden is the total external volt-amp load on the secondary at rated secondary voltage. The rated burden of a PT is a VA burden which must not be exceeded if the transformer is to operate with its rated accuracy. The rated burden is indicated on the nameplate.

What is stepup and stepdown transformer?

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 turn ratio?

Definition of turn ratio

: the ratio of the number of turns in one of two inductively coupled circuits to the number in the other.

What is ratio of transformer?

The turns ratio of a transformer is defined as the number of turns on its secondary divided by the number of turns on its primary.

How are winding turns calculated?

Calculate the inductance associated with the winding using the formula L = (u0 * A * N^2)/l where u0 is the permeability of free space at 12.56 x 10^-7. If N is 100 turns, l is 6 meters and A is 7.069 square meters.

What is a step down transformer?

A Step Down Transformer is designed to reduce the voltage from the primary winding to secondary winding. We use a Step Down Transformer as it converts a high voltage & low current alternating source to a low voltage & high current alternating supply.

What is NP in a transformer?

3. In a transformer Np / Ns is called the voltage ratio. If Ns is less than Np then Vs is less than Vp. This is called a step-down transformer as the voltage is reduced. If Ns is greater than Np then Vs is greater than Vp.

What is primary voltage in a transformer?

The primary voltage is the input voltage, normally 120, 208, 240 or 460 volts. The secondary voltage or the output voltage will normally be between 24 and 30 volts. The actual output voltage will depend on the actual primary voltage. The transformer power is rated by VA capability.

What is K in transformer?

K-factor is a weighting of the harmonic load currents according to their effects on transformer heating, as derived from ANSI/IEEE C57. 110. The higher the K-factor, the greater the harmonic heating effects. There are many different loads such as computers, solid state devices and motors which cause a non linear load.

What is TTR test of transformer?

Transformer Turns Ratio (TTR) testing is one of the most common ways of assessing the condition of a transformer's windings and core. Throughout the life of a transformer, TTR results are compared against the nameplate ratings to reveal insulation deterioration, shorted turns, core heating or other abnormalities.

What is EMF equation of transformer?

Therefore, in general, the EMF equation of the transformer is represented as, ?=4.44?φ??…( 3)

What is the use of breather?

The breather is used in the transformer to filter out the moisture from the air. Breather consists of silica gel which absorbs moisture from the air. Conservator tank present at the top of the transformer which allows adequate space for expansion of oil.

What is the difference between primary winding and secondary winding?

Generally, the primary winding of a transformer is connected to the input voltage supply and converts or transforms the electrical power into a magnetic field. While the job of the secondary winding is to convert this alternating magnetic field into electrical power producing the required output voltage as shown.

Why step down transformer is used?

While the use of the type of transformer in a rectifier depends on the voltage requirement or to meet desired operating conditions, a step-down transformer is used mainly to reduce the voltage. It is used to bring the high AC voltage level to a reasonable value or the desired output voltage.

What are 4 types of transformers?

What are the 3 types of transformers?

Depending on the Power rating and specification, Power transformers can further be classified into three categories: Small power transformer, Medium Power transformers, and the Large power transformers.

How do I calculate kVA?