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Negative Sequence Voltage (LLF) Formula

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

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Negative Sequence Voltage consists of balanced three-phase voltage and current phasors which are exactly at 120 degrees apart rotating counterclockwise in ACB rotation. Check FAQs

V 2 = V 1 - (Z f \cdot I 1)

V₂ - Negative Sequence Voltage?V₁ - Positive Sequence Voltage?Z_f - Fault Impedance?I₁ - Positive Sequence Current?

Negative Sequence Voltage (LLF) Example

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Here is how the Negative Sequence Voltage (LLF) equation looks like with Values.

Here is how the Negative Sequence Voltage (LLF) equation looks like with Units.

Here is how the Negative Sequence Voltage (LLF) equation looks like.

14.4985 = 17.5 - (1.5 \cdot 2.001)

14.4985V = 17.5V - (1.5Ω \cdot 2.001A)

14.4985 = 17.5 - (1.5 \cdot 2.001)

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Negative Sequence Voltage (LLF) Solution

Follow our step by step solution on how to calculate Negative Sequence Voltage (LLF)?

FIRST Step Consider the formula

V 2 = V 1 - (Z f \cdot I 1)

Next Step Substitute values of Variables

∴

V 2 = 17.5V - (1.5Ω \cdot 2.001A)

Next Step Prepare to Evaluate

∴

V 2 = 17.5 - (1.5 \cdot 2.001)

LAST Step Evaluate

∴

V 2 = 14.4985V

Negative Sequence Voltage (LLF) Formula Elements

Variables

Negative Sequence Voltage

Negative Sequence Voltage consists of balanced three-phase voltage and current phasors which are exactly at 120 degrees apart rotating counterclockwise in ACB rotation.

Symbol: V₂

Measurement: Electric PotentialUnit: V

Note: Value can be positive or negative.

Formulas to find Negative Sequence Voltage

Positive Sequence Voltage

Positive Sequence Voltage consists of balanced three-phase voltage and current phasors which are exactly at 120 degrees apart rotating counterclockwise in ABC rotation.

Symbol: V₁

Measurement: Electric PotentialUnit: V

Note: Value should be greater than 0.

Formulas to find Positive Sequence Voltage

Fault Impedance

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.

Symbol: Z_f

Measurement: Electric ResistanceUnit: Ω

Note: Value should be greater than 0.

Formulas to find Fault Impedance

Positive Sequence Current

Positive Sequence Current consists of balanced three-phase voltage and current phasors which are exactly at 120 degrees apart rotating counterclockwise in ABC rotation.

Symbol: I₁

Measurement: Electric CurrentUnit: A

Note: Value can be positive or negative.

Formulas to find Positive Sequence Current

Other Formulas to find Negative Sequence Voltage

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

V 2 = \frac{E a \cdot Z 2}{Z 1 + Z 2}

Other formulas in Voltage and EMF category

Go B-Phase Voltage (LLF)

V b = (Z f \cdot I b) + V c

Go C-Phase Voltage (LLF)

V c = V b - (Z f \cdot I b)

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

V c = V b + (Z f \cdot I c)

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

V b = V c - (Z f \cdot I c)

How to Evaluate Negative Sequence Voltage (LLF)?

Negative Sequence Voltage (LLF) evaluator uses Negative Sequence Voltage = Positive Sequence Voltage-(Fault Impedance*Positive Sequence Current) to evaluate 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 evaluate Negative Sequence Voltage (LLF) using this online evaluator? To use this online evaluator for Negative Sequence Voltage (LLF), enter Positive Sequence Voltage (V₁), Fault Impedance (Z_f) & Positive Sequence Current (I₁) and hit the calculate button.

FAQs on Negative Sequence Voltage (LLF)

What is the formula to find Negative Sequence Voltage (LLF)?

The formula of Negative Sequence Voltage (LLF) is expressed as Negative Sequence Voltage = Positive Sequence Voltage-(Fault Impedance*Positive Sequence Current). Here is an example- 10.4985 = 17.5-(1.5*2.001).

How to calculate Negative Sequence Voltage (LLF)?

With Positive Sequence Voltage (V₁), Fault Impedance (Z_f) & Positive Sequence Current (I₁) we can find Negative Sequence Voltage (LLF) using the formula - Negative Sequence Voltage = Positive Sequence Voltage-(Fault Impedance*Positive Sequence Current).

What are the other ways to Calculate Negative Sequence Voltage?

Here are the different ways to Calculate Negative Sequence Voltage-

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

Can the Negative Sequence Voltage (LLF) be negative?

Yes, the Negative Sequence Voltage (LLF), measured in Electric Potential can be negative.

Which unit is used to measure Negative Sequence Voltage (LLF)?

Negative Sequence Voltage (LLF) is usually measured using the Volt[V] for Electric Potential. Millivolt[V], Microvolt[V], Nanovolt[V] are the few other units in which Negative Sequence Voltage (LLF) can be measured.

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