Positive Sequence Voltage (LLF) Calculator

✖Fault Impedance is a measure of the resistance and reactance in an electrical circuit that is used to calculate the fault current that flows through the circuit in the event of a fault.ⓘ Fault Impedance [Z_f]			+10% -10%
✖Positive Sequence Current consists of balanced three-phase voltage and current phasors which are exactly at 120 degrees apart rotating counterclockwise in ABC rotation.ⓘ Positive Sequence Current [I₁]			+10% -10%
✖Negative Sequence Voltage consists of balanced three-phase voltage and current phasors which are exactly at 120 degrees apart rotating counterclockwise in ACB rotation.ⓘ Negative Sequence Voltage [V₂]			+10% -10%

✖Positive Sequence Voltage consists of balanced three-phase voltage and current phasors which are exactly at 120 degrees apart rotating counterclockwise in ABC rotation.ⓘ Positive Sequence Voltage (LLF) [V₁]

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Positive Sequence Voltage (LLF) Solution

STEP 0: Pre-Calculation Summary

Formula Used

Positive Sequence Voltage = (Fault Impedance*Positive Sequence Current)+Negative Sequence Voltage
V₁ = (Z_f*I₁)+V₂
This formula uses 4 Variables

Variables Used

Positive Sequence Voltage - (Measured in Volt) - Positive Sequence Voltage consists of balanced three-phase voltage and current phasors which are exactly at 120 degrees apart rotating counterclockwise in ABC rotation.
Fault Impedance - (Measured in Ohm) - Fault Impedance is a measure of the resistance and reactance in an electrical circuit that is used to calculate the fault current that flows through the circuit in the event of a fault.
Positive Sequence Current - (Measured in Ampere) - Positive Sequence Current consists of balanced three-phase voltage and current phasors which are exactly at 120 degrees apart rotating counterclockwise in ABC rotation.
Negative Sequence Voltage - (Measured in Volt) - Negative Sequence Voltage consists of balanced three-phase voltage and current phasors which are exactly at 120 degrees apart rotating counterclockwise in ACB rotation.

STEP 1: Convert Input(s) to Base Unit

Fault Impedance: 1.5 Ohm --> 1.5 Ohm No Conversion Required
Positive Sequence Current: 2.001 Ampere --> 2.001 Ampere No Conversion Required
Negative Sequence Voltage: 16.056 Volt --> 16.056 Volt No Conversion Required

STEP 2: Evaluate Formula

Substituting Input Values in Formula

V₁ = (Z_f*I₁)+V₂ --> (1.5*2.001)+16.056

Evaluating ... ...

V₁ = 19.0575

STEP 3: Convert Result to Output's Unit

19.0575 Volt --> No Conversion Required

FINAL ANSWER

19.0575 Volt <-- Positive Sequence Voltage

(Calculation completed in 00.038 seconds)

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Home » Engineering » Electrical » Power System » Fault » Shunt Faults » Unsymmetrical Faults » L L Fault » Voltage and EMF » Positive Sequence Voltage (LLF)

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Created by Urvi Rathod

Vishwakarma Government Engineering College (VGEC), Ahmedabad

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< Voltage and EMF Calculators

C-Phase Voltage using C-Phase Current (LLF)

LaTeX Go C Phase Voltage = B Phase Voltage+(Fault Impedance*C Phase Current)

B-Phase Voltage using C-Phase Current (LLF)

LaTeX Go B Phase Voltage = C Phase Voltage-(Fault Impedance*C Phase Current)

B-Phase Voltage (LLF)

LaTeX Go B Phase Voltage = (Fault Impedance*B Phase Current)+C Phase Voltage

C-Phase Voltage (LLF)

LaTeX Go C Phase Voltage = B Phase Voltage-(Fault Impedance*B Phase Current)

Positive Sequence Voltage (LLF) Formula

LaTeX Go

Positive Sequence Voltage = (Fault Impedance*Positive Sequence Current)+Negative Sequence Voltage
V₁ = (Z_f*I₁)+V₂

What is sequence voltage?

The positive sequence consists of balanced three-phase voltage and current phasors which are exactly at ₁₂₀ degrees apart rotating counterclockwise in ABC rotation. Remember voltages are line-neutral. This is the voltage that we can expect out of an ideal three-phase generator.

How to Calculate Positive Sequence Voltage (LLF)?

Positive Sequence Voltage (LLF) calculator uses Positive Sequence Voltage = (Fault Impedance*Positive Sequence Current)+Negative Sequence Voltage to calculate the Positive Sequence Voltage, The Positive Sequence Voltage (LLF) formula is consists of balanced three-phase voltage and current phasors which are exactly at ₁₂₀ degrees apart rotating counterclockwise in ABC rotation. Positive Sequence Voltage is denoted by V₁ symbol.

How to calculate Positive Sequence Voltage (LLF) using this online calculator? To use this online calculator for Positive Sequence Voltage (LLF), enter Fault Impedance (Z_f), Positive Sequence Current (I₁) & Negative Sequence Voltage (V₂) and hit the calculate button. Here is how the Positive Sequence Voltage (LLF) calculation can be explained with given input values -> 19.0575 = (1.5*2.001)+16.056.

FAQ

What is Positive Sequence Voltage (LLF)?

The Positive Sequence Voltage (LLF) formula is consists of balanced three-phase voltage and current phasors which are exactly at ₁₂₀ degrees apart rotating counterclockwise in ABC rotation and is represented as V₁ = (Z_f*I₁)+V₂ or Positive Sequence Voltage = (Fault Impedance*Positive Sequence Current)+Negative Sequence Voltage. Fault Impedance is a measure of the resistance and reactance in an electrical circuit that is used to calculate the fault current that flows through the circuit in the event of a fault, Positive Sequence Current consists of balanced three-phase voltage and current phasors which are exactly at 120 degrees apart rotating counterclockwise in ABC rotation & Negative Sequence Voltage consists of balanced three-phase voltage and current phasors which are exactly at 120 degrees apart rotating counterclockwise in ACB rotation.

How to calculate Positive Sequence Voltage (LLF)?

The Positive Sequence Voltage (LLF) formula is consists of balanced three-phase voltage and current phasors which are exactly at ₁₂₀ degrees apart rotating counterclockwise in ABC rotation is calculated using Positive Sequence Voltage = (Fault Impedance*Positive Sequence Current)+Negative Sequence Voltage. To calculate Positive Sequence Voltage (LLF), you need Fault Impedance (Z_f), Positive Sequence Current (I₁) & Negative Sequence Voltage (V₂). With our tool, you need to enter the respective value for Fault Impedance, Positive Sequence Current & Negative Sequence Voltage and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.

How many ways are there to calculate Positive Sequence Voltage?

In this formula, Positive Sequence Voltage uses Fault Impedance, Positive Sequence Current & Negative Sequence Voltage. We can use 2 other way(s) to calculate the same, which is/are as follows -

Positive Sequence Voltage = A Phase EMF-Positive Sequence Impedance*Positive Sequence Current
Positive Sequence Voltage = (A Phase EMF*Negative Sequence Impedance)/(Positive Sequence Impedance+Negative Sequence Impedance)

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