Negative Sequence Voltage (LLF) Calculator

✖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 [V₁]			+10% -10%
✖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 (LLF) [V₂]

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Formula

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Negative Sequence Voltage (LLF)

Formula

`"V"_{"2"} = "V"_{"1"}-("Z"_{"f"}*"I"_{"1"})`

Example

`"14.4985V"="17.5V"-("1.5Ω"*"2.001A")`

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Negative Sequence Voltage (LLF) Solution

STEP 0: Pre-Calculation Summary

Formula Used

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

Variables Used

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.
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.

STEP 1: Convert Input(s) to Base Unit

Positive Sequence Voltage: 17.5 Volt --> 17.5 Volt No Conversion Required
Fault Impedance: 1.5 Ohm --> 1.5 Ohm No Conversion Required
Positive Sequence Current: 2.001 Ampere --> 2.001 Ampere No Conversion Required

STEP 2: Evaluate Formula

Substituting Input Values in Formula

V₂ = V₁-(Z_f*I₁) --> 17.5-(1.5*2.001)

Evaluating ... ...

V₂ = 14.4985

STEP 3: Convert Result to Output's Unit

14.4985 Volt --> No Conversion Required

FINAL ANSWER

14.4985 Volt <-- Negative Sequence Voltage

(Calculation completed in 00.020 seconds)

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Home » Engineering » Electrical » Power System » Fault » Shunt Faults » Unsymmetrical Faults » L-L Fault » Voltage & EMF » Negative Sequence Voltage (LLF)

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Created by Urvi Rathod

Vishwakarma Government Engineering College (VGEC), Ahmedabad

Urvi Rathod has created this Calculator and 1500+ more calculators!

Verified by Payal Priya

Birsa Institute of Technology (BIT), Sindri

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< 13 Voltage & EMF Calculators

Positive Sequence Voltage using A-Phase EMF and Sequence Impedances(LLF)

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

Negative Sequence Voltage using A-Phase EMF and Sequence Impedances(LLF)

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

A-Phase EMF using Positive Sequence Voltage(LLF)

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

A-Phase EMF using Positive Sequence Current and Sequence Impedances(LLF)

Go A Phase EMF = Positive Sequence Current*(Positive Sequence Impedance+Negative Sequence Impedance+Fault Impedance)

A-Phase EMF using Fault Current(LLF)

Go A Phase EMF = (Fault Current*(Positive Sequence Impedance+Negative Sequence Impedance))/sqrt(3)

Positive Sequence Voltage (LLF)

Go Positive Sequence Voltage = (Fault Impedance*Positive Sequence Current)+Negative Sequence Voltage

Negative Sequence Voltage (LLF)

Go Negative Sequence Voltage = Positive Sequence Voltage-(Fault Impedance*Positive Sequence Current)

Positive Sequence Voltage using A-Phase EMF and Positive Sequence Current(LLF)

Go Positive Sequence Voltage = A Phase EMF-Positive Sequence Impedance*Positive Sequence Current

A-Phase EMF using Positive Sequence Current and Voltage(LLF)

Go A Phase EMF = Positive Sequence Voltage+Positive Sequence Impedance*Positive Sequence Current

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

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

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

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

B-Phase Voltage (LLF)

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

C-Phase Voltage (LLF)

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

Negative Sequence Voltage (LLF) Formula

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

What are sequence voltages?

The positive sequence consists of balanced three-phase voltage and current phasors which are exactly at ₁₂₀ degrees apart rotating counterclockwise in ABC rotation. The negative sequence consists of balanced three-phase voltage and current phasors which are exactly at ₁₂₀ degrees apart rotating counterclockwise in ACB rotation. Zero sequence consists of a balanced three-phase voltage and current, phasors of which all have the same phase angles and rotate counterclockwise together.

How to Calculate Negative Sequence Voltage (LLF)?

Negative Sequence Voltage (LLF) calculator uses Negative Sequence Voltage = Positive Sequence Voltage-(Fault Impedance*Positive Sequence Current) to calculate the Negative Sequence Voltage, The Negative Sequence Voltage (LLF) formula is defined as consists of balanced three-phase voltage and current phasors which are exactly at ₁₂₀ degrees apart rotating counterclockwise in ACB rotation. Negative Sequence Voltage is denoted by V₂ symbol.

How to calculate Negative Sequence Voltage (LLF) using this online calculator? To use this online calculator for Negative Sequence Voltage (LLF), enter Positive Sequence Voltage (V₁), Fault Impedance (Z_f) & Positive Sequence Current (I₁) and hit the calculate button. Here is how the Negative Sequence Voltage (LLF) calculation can be explained with given input values -> 10.4985 = 17.5-(1.5*2.001).

FAQ

What is Negative Sequence Voltage (LLF)?

The Negative Sequence Voltage (LLF) formula is defined as consists of balanced three-phase voltage and current phasors which are exactly at ₁₂₀ degrees apart rotating counterclockwise in ACB rotation and is represented as V₂ = V₁-(Z_f*I₁) or Negative Sequence Voltage = Positive Sequence Voltage-(Fault Impedance*Positive Sequence Current). 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 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.

How to calculate Negative Sequence Voltage (LLF)?

The Negative Sequence Voltage (LLF) formula is defined as consists of balanced three-phase voltage and current phasors which are exactly at ₁₂₀ degrees apart rotating counterclockwise in ACB rotation is calculated using Negative Sequence Voltage = Positive Sequence Voltage-(Fault Impedance*Positive Sequence Current). To calculate Negative Sequence Voltage (LLF), you need Positive Sequence Voltage (V₁), Fault Impedance (Z_f) & Positive Sequence Current (I₁). With our tool, you need to enter the respective value for Positive Sequence Voltage, Fault Impedance & Positive Sequence Current 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 Negative Sequence Voltage?

In this formula, Negative Sequence Voltage uses Positive Sequence Voltage, Fault Impedance & Positive Sequence Current. We can use 1 other way(s) to calculate the same, which is/are as follows -

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

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