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Positive Sequence Current using Fault Impedance(LLF) Formula

GoPositive Sequence Current (LLF) Formula

GoPositive Sequence Current using A-Phase EMF(LLF) Formula

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

I 1 = \frac{V 1 - V 2}{Z f}

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

Positive Sequence Current using Fault Impedance(LLF) Example

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Here is how the Positive Sequence Current using Fault Impedance(LLF) equation looks like with Values.

Here is how the Positive Sequence Current using Fault Impedance(LLF) equation looks like with Units.

Here is how the Positive Sequence Current using Fault Impedance(LLF) equation looks like.

0.9627 = \frac{17.5 - 16.056}{1.5}

0.9627A = \frac{17.5V - 16.056V}{1.5Ω}

0.9627 = \frac{17.5 - 16.056}{1.5}

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Positive Sequence Current using Fault Impedance(LLF) Solution

Follow our step by step solution on how to calculate Positive Sequence Current using Fault Impedance(LLF)?

FIRST Step Consider the formula

I 1 = \frac{V 1 - V 2}{Z f}

Next Step Substitute values of Variables

∴

I 1 = \frac{17.5V - 16.056V}{1.5Ω}

Next Step Prepare to Evaluate

∴

I 1 = \frac{17.5 - 16.056}{1.5}

Next Step Evaluate

∴

I 1 = 0.962666666666666A

LAST Step Rounding Answer

∴

I 1 = 0.9627A

Positive Sequence Current using Fault Impedance(LLF) Formula Elements

Variables

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

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

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

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

Other Formulas to find Positive Sequence Current

Go Positive Sequence Current (LLF)

I 1 = (- 1) \cdot I 2

Go Positive Sequence Current using A-Phase EMF(LLF)

I 1 = \frac{E a}{Z 1 + Z 2 + Z f}

Other formulas in Current category

Go B-Phase Current (LLF)

I b = (- 1) \cdot I c

Go C-Phase Current(LLF)

I c = (- 1) \cdot I b

Go Negative Sequence Current(LLF)

I 2 = (- 1) \cdot I 1

Go Fault Current(LLF)

I f = \frac{\sqrt{3} \cdot E a}{Z 1 + Z 2}

How to Evaluate Positive Sequence Current using Fault Impedance(LLF)?

Positive Sequence Current using Fault Impedance(LLF) evaluator uses Positive Sequence Current = (Positive Sequence Voltage-Negative Sequence Voltage)/Fault Impedance to evaluate the Positive Sequence Current, The Positive Sequence Current using Fault Impedance(LLF) formula consists of balanced three-phase voltage and current phasors which are exactly at ₁₂₀ degrees apart rotating counterclockwise in ACB rotation. Positive Sequence Current is denoted by I₁ symbol.

How to evaluate Positive Sequence Current using Fault Impedance(LLF) using this online evaluator? To use this online evaluator for Positive Sequence Current using Fault Impedance(LLF), enter Positive Sequence Voltage (V₁), Negative Sequence Voltage (V₂) & Fault Impedance (Z_f) and hit the calculate button.

FAQs on Positive Sequence Current using Fault Impedance(LLF)

What is the formula to find Positive Sequence Current using Fault Impedance(LLF)?

The formula of Positive Sequence Current using Fault Impedance(LLF) is expressed as Positive Sequence Current = (Positive Sequence Voltage-Negative Sequence Voltage)/Fault Impedance. Here is an example- -1.704 = (17.5-16.056)/1.5.

How to calculate Positive Sequence Current using Fault Impedance(LLF)?

With Positive Sequence Voltage (V₁), Negative Sequence Voltage (V₂) & Fault Impedance (Z_f) we can find Positive Sequence Current using Fault Impedance(LLF) using the formula - Positive Sequence Current = (Positive Sequence Voltage-Negative Sequence Voltage)/Fault Impedance.

What are the other ways to Calculate Positive Sequence Current?

Here are the different ways to Calculate Positive Sequence Current-

Positive Sequence Current=(-1)*Negative Sequence Current
Positive Sequence Current=A Phase EMF/(Positive Sequence Impedance+Negative Sequence Impedance+Fault Impedance)

Can the Positive Sequence Current using Fault Impedance(LLF) be negative?

Yes, the Positive Sequence Current using Fault Impedance(LLF), measured in Electric Current can be negative.

Which unit is used to measure Positive Sequence Current using Fault Impedance(LLF)?

Positive Sequence Current using Fault Impedance(LLF) is usually measured using the Ampere[A] for Electric Current. Milliampere[A], Microampere[A], Centiampere[A] are the few other units in which Positive Sequence Current using Fault Impedance(LLF) can be measured.

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