P.U. Primary Resistance Drop Calculator

✖Primary Current is the current which is flow in the primary winding of the transformer. The primary current of the transformer is dictated by the load current.ⓘ Primary Current [I₁]			+10% -10%
✖The Equivalent Resistance from Primary side is the total resistance of the primary side.ⓘ Equivalent Resistance from Primary [R₀₁]			+10% -10%
✖EMF Induced in Primary Winding is the production of voltage in a coil because of the change in magnetic flux through a coil.ⓘ EMF Induced in Primary [E₁]			+10% -10%

✖P U Primary Resistance drop is defined as the resistance drop at rated current and frequency expressed at rated voltage.ⓘ P.U. Primary Resistance Drop [R_pu]

⎘ Copy

👎

Formula

✖

P.U. Primary Resistance Drop

Formula

`"R"_{"pu"} = ("I"_{"1"}*"R"_{"01"})/"E"_{"1"}`

Example

`"34.335"=("12.6A"*"35.97Ω")/"13.2V"`

Calculator

LaTeX

Reset

👍

Download Transformer Formula PDF PDF Image

P.U. Primary Resistance Drop Solution

STEP 0: Pre-Calculation Summary

Formula Used

P U Primary Resistance drop = (Primary Current*Equivalent Resistance from Primary)/EMF Induced in Primary
R_pu = (I₁*R₀₁)/E₁
This formula uses 4 Variables

Variables Used

P U Primary Resistance drop - P U Primary Resistance drop is defined as the resistance drop at rated current and frequency expressed at rated voltage.
Primary Current - (Measured in Ampere) - Primary Current is the current which is flow in the primary winding of the transformer. The primary current of the transformer is dictated by the load current.
Equivalent Resistance from Primary - (Measured in Ohm) - The Equivalent Resistance from Primary side is the total resistance of the primary side.
EMF Induced in Primary - (Measured in Volt) - EMF Induced in Primary Winding is the production of voltage in a coil because of the change in magnetic flux through a coil.

STEP 1: Convert Input(s) to Base Unit

Primary Current: 12.6 Ampere --> 12.6 Ampere No Conversion Required
Equivalent Resistance from Primary: 35.97 Ohm --> 35.97 Ohm No Conversion Required
EMF Induced in Primary: 13.2 Volt --> 13.2 Volt No Conversion Required

STEP 2: Evaluate Formula

Substituting Input Values in Formula

R_pu = (I₁*R₀₁)/E₁ --> (12.6*35.97)/13.2

Evaluating ... ...

R_pu = 34.335

STEP 3: Convert Result to Output's Unit

34.335 --> No Conversion Required

FINAL ANSWER

34.335 <-- P U Primary Resistance drop

(Calculation completed in 00.004 seconds)

You are here -

Home » Engineering » Electrical » Machine » AC Machines » Transformer » Resistance » P.U. Primary Resistance Drop

Credits

Created by Jaffer Ahmad Khan

College Of Engineering, Pune (COEP), Pune

Jaffer Ahmad Khan has created this Calculator and 10+ more calculators!

Verified by Parminder Singh

Chandigarh University (CU), Punjab

Parminder Singh has verified this Calculator and 500+ more calculators!

< 18 Resistance Calculators

Equivalent Resistance from Secondary Side using Equivalent Impedance from Secondary Side

Go Equivalent Resistance from Secondary = sqrt(Equivalent Impedance from Secondary^2-Equivalent Reactance from Secondary^2)

Equivalent Resistance from Primary Side using Equivalent Impedance from Primary Side

Go Equivalent Resistance from Primary = sqrt(Equivalent Impedance from Primary^2-Equivalent Reactance from Primary^2)

Primary Winding Resistance given Secondary Winding Resistance

Go Resistance of Primary = (Equivalent Resistance from Secondary-Resistance of Secondary)/(Transformation Ratio^2)

Secondary Winding Resistance given Equivalent Resistance from Primary Side

Go Resistance of Secondary = (Equivalent Resistance from Primary-Resistance of Primary)*Transformation Ratio^2

Secondary Winding Resistance given Primary Winding Resistance

Go Resistance of Secondary = Equivalent Resistance from Secondary-Resistance of Primary*Transformation Ratio^2

Equivalent Resistance from Secondary Side

Go Equivalent Resistance from Secondary = Resistance of Secondary+Resistance of Primary*Transformation Ratio^2

Equivalent Resistance from Primary Side

Go Equivalent Resistance from Primary = Resistance of Primary+Resistance of Secondary/Transformation Ratio^2

P.U. Primary Resistance Drop

Go P U Primary Resistance drop = (Primary Current*Equivalent Resistance from Primary)/EMF Induced in Primary

Secondary Winding Resistance given Impedance of Secondary Winding

Go Resistance of Secondary = sqrt(Impedance of Secondary^2-Secondary Leakage Reactance^2)

Primary Winding Resistance given Impedance of Primary Winding

Go Resistance of Primary = sqrt(Impedance of Primary^2-Primary Leakage Reactance^2)

Resistance of Primary in Secondary using Equivalent Resistance from Secondary Side

Go Resistance of Primary in Secondary = Equivalent Resistance from Secondary-Resistance of Secondary in Primary

Equivalent Resistance of Transformer from Secondary Side

Go Equivalent Resistance from Secondary = Resistance of Primary in Secondary+Resistance of Secondary

Resistance of Secondary in Primary using Equivalent Resistance from Primary Side

Go Resistance of Secondary in Primary = Equivalent Resistance from Primary-Resistance of Primary

Equivalent Resistance of Transformer from Primary Side

Go Equivalent Resistance from Primary = Resistance of Secondary in Primary+Resistance of Primary

Resistance of Secondary Winding in Primary

Go Resistance of Secondary in Primary = Resistance of Secondary/Transformation Ratio^2

Secondary Winding Resistance

Go Resistance of Secondary = Resistance of Secondary in Primary*Transformation Ratio^2

Primary Winding Resistance

Go Resistance of Primary = Resistance of Primary in Secondary/(Transformation Ratio^2)

Resistance of Primary Winding in Secondary

Go Resistance of Primary in Secondary = Resistance of Primary*Transformation Ratio^2

< 25 Transformer Circuit Calculators

EMF Induced in Secondary Winding

Go EMF Induced in Secondary = 4.44*Number of Turns in Secondary*Supply Frequency*Area of Core*Maximum Flux Density

EMF Induced in Primary Winding

Go EMF Induced in Primary = 4.44*Number of Turns in Primary*Supply Frequency*Area of Core*Maximum Flux Density

Equivalent Impedance of Transformer from Secondary Side

Go Equivalent Impedance from Secondary = sqrt(Equivalent Resistance from Secondary^2+Equivalent Reactance from Secondary^2)

Equivalent Impedance of Transformer from Primary Side

Go Equivalent Impedance from Primary = sqrt(Equivalent Resistance from Primary^2+Equivalent Reactance from Primary^2)

Equivalent Resistance from Secondary Side

Go Equivalent Resistance from Secondary = Resistance of Secondary+Resistance of Primary*Transformation Ratio^2

Equivalent Resistance from Primary Side

Go Equivalent Resistance from Primary = Resistance of Primary+Resistance of Secondary/Transformation Ratio^2

P.U. Primary Resistance Drop

Go P U Primary Resistance drop = (Primary Current*Equivalent Resistance from Primary)/EMF Induced in Primary

Terminal Voltage during No Load

Go No Load Terminal Voltage = (Primary Voltage*Number of Turns in Secondary)/Number of Turns in Primary

Transformation Ratio given Secondary Leakage Reactance

Go Transformation Ratio = sqrt(Secondary Leakage Reactance/Reactance of Secondary in Primary)

Transformation Ratio given Primary Leakage Reactance

Go Transformation Ratio = sqrt(Reactance of Primary in Secondary/Primary Leakage Reactance)

Equivalent Reactance of Transformer from Secondary Side

Go Equivalent Reactance from Secondary = Secondary Leakage Reactance+Reactance of Primary in Secondary

Equivalent Reactance of Transformer from Primary Side

Go Equivalent Reactance from Primary = Primary Leakage Reactance+Reactance of Secondary in Primary

Reactance of Secondary Winding in Primary

Go Reactance of Secondary in Primary = Secondary Leakage Reactance/(Transformation Ratio^2)

Primary Leakage Reactance

Go Primary Leakage Reactance = Reactance of Primary in Secondary/(Transformation Ratio^2)

Reactance of Primary Winding in Secondary

Go Reactance of Primary in Secondary = Primary Leakage Reactance*Transformation Ratio^2

Resistance of Secondary Winding in Primary

Go Resistance of Secondary in Primary = Resistance of Secondary/Transformation Ratio^2

Secondary Winding Resistance

Go Resistance of Secondary = Resistance of Secondary in Primary*Transformation Ratio^2

Primary Winding Resistance

Go Resistance of Primary = Resistance of Primary in Secondary/(Transformation Ratio^2)

Resistance of Primary Winding in Secondary

Go Resistance of Primary in Secondary = Resistance of Primary*Transformation Ratio^2

Transformation Ratio given Primary and Secondary Number of Turns

Go Transformation Ratio = Number of Turns in Secondary/Number of Turns in Primary

Secondary Leakage Reactance

Go Secondary Leakage Reactance = Self Induced EMF in Secondary/Secondary Current

Transformation Ratio given Primary and Secondary Current

Go Transformation Ratio = Primary Current/Secondary Current

Transformation Ratio given Primary and Secondary Voltage

Go Transformation Ratio = Secondary Voltage/Primary Voltage

Secondary Voltage given Voltage Transformation Ratio

Go Secondary Voltage = Primary Voltage*Transformation Ratio

Primary Voltage given Voltage Transformation Ratio

Go Primary Voltage = Secondary Voltage/Transformation Ratio

P.U. Primary Resistance Drop Formula

P U Primary Resistance drop = (Primary Current*Equivalent Resistance from Primary)/EMF Induced in Primary
R_pu = (I₁*R₀₁)/E₁

What is per-unit resistance of transformer?

The per-unit impedance describes that percentage of the rated voltage required to produce full load current while the transformer output is shorted. The lower the impedance, the lower the voltage required to produce full load current.

How to Calculate P.U. Primary Resistance Drop?

P.U. Primary Resistance Drop calculator uses P U Primary Resistance drop = (Primary Current*Equivalent Resistance from Primary)/EMF Induced in Primary to calculate the P U Primary Resistance drop, P.U. Primary Resistance drop is defined as the resistance drop at rated current and frequency expressed at rated voltage. P U Primary Resistance drop is denoted by R_pu symbol.

How to calculate P.U. Primary Resistance Drop using this online calculator? To use this online calculator for P.U. Primary Resistance Drop, enter Primary Current (I₁), Equivalent Resistance from Primary (R₀₁) & EMF Induced in Primary (E₁) and hit the calculate button. Here is how the P.U. Primary Resistance Drop calculation can be explained with given input values -> 34.335 = (12.6*35.97)/13.2.

FAQ

What is P.U. Primary Resistance Drop?

P.U. Primary Resistance drop is defined as the resistance drop at rated current and frequency expressed at rated voltage and is represented as R_pu = (I₁*R₀₁)/E₁ or P U Primary Resistance drop = (Primary Current*Equivalent Resistance from Primary)/EMF Induced in Primary. Primary Current is the current which is flow in the primary winding of the transformer. The primary current of the transformer is dictated by the load current, The Equivalent Resistance from Primary side is the total resistance of the primary side & EMF Induced in Primary Winding is the production of voltage in a coil because of the change in magnetic flux through a coil.

How to calculate P.U. Primary Resistance Drop?

P.U. Primary Resistance drop is defined as the resistance drop at rated current and frequency expressed at rated voltage is calculated using P U Primary Resistance drop = (Primary Current*Equivalent Resistance from Primary)/EMF Induced in Primary. To calculate P.U. Primary Resistance Drop, you need Primary Current (I₁), Equivalent Resistance from Primary (R₀₁) & EMF Induced in Primary (E₁). With our tool, you need to enter the respective value for Primary Current, Equivalent Resistance from Primary & EMF Induced in Primary and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.

Home

FREE PDFs

🔍 Search