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Fault Impedance using Positive Sequence Current (LLF) Formula

GoFault Impedance using A-Phase EMF(LLF) Formula

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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. Check FAQs

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

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

Fault Impedance using Positive Sequence Current (LLF) Example

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

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

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

0.7216 = \frac{17.5 - 16.056}{2.001}

0.7216Ω = \frac{17.5V - 16.056V}{2.001A}

0.7216 = \frac{17.5 - 16.056}{2.001}

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Fault Impedance using Positive Sequence Current (LLF) Solution

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

FIRST Step Consider the formula

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

Next Step Substitute values of Variables

∴

Z f = \frac{17.5V - 16.056V}{2.001A}

Next Step Prepare to Evaluate

∴

Z f = \frac{17.5 - 16.056}{2.001}

Next Step Evaluate

∴

Z f = 0.721639180409795Ω

LAST Step Rounding Answer

∴

Z f = 0.7216Ω

Fault Impedance using Positive Sequence Current (LLF) Formula Elements

Variables

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 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

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 Fault Impedance

Go Fault Impedance using A-Phase EMF(LLF)

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

Other formulas in Impedance category

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

Z 1 = \frac{E a - V 1}{I 1}

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

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

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

Fault Impedance using Positive Sequence Current (LLF) evaluator uses Fault Impedance = (Positive Sequence Voltage-Negative Sequence Voltage)/Positive Sequence Current to evaluate the Fault Impedance, The Fault Impedance using Positive Sequence Current (LLF) formula is defined as the impedance that is connected to the ground or earth. Fault Impedance is denoted by Z_f symbol.

How to evaluate Fault Impedance using Positive Sequence Current (LLF) using this online evaluator? To use this online evaluator for Fault Impedance using Positive Sequence Current (LLF), enter Positive Sequence Voltage (V₁), Negative Sequence Voltage (V₂) & Positive Sequence Current (I₁) and hit the calculate button.

FAQs on Fault Impedance using Positive Sequence Current (LLF)

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

The formula of Fault Impedance using Positive Sequence Current (LLF) is expressed as Fault Impedance = (Positive Sequence Voltage-Negative Sequence Voltage)/Positive Sequence Current. Here is an example- -1.277361 = (17.5-16.056)/2.001.

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

With Positive Sequence Voltage (V₁), Negative Sequence Voltage (V₂) & Positive Sequence Current (I₁) we can find Fault Impedance using Positive Sequence Current (LLF) using the formula - Fault Impedance = (Positive Sequence Voltage-Negative Sequence Voltage)/Positive Sequence Current.

What are the other ways to Calculate Fault Impedance?

Here are the different ways to Calculate Fault Impedance-

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

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

No, the Fault Impedance using Positive Sequence Current (LLF), measured in Electric Resistance cannot be negative.

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

Fault Impedance using Positive Sequence Current (LLF) is usually measured using the Ohm[Ω] for Electric Resistance. Megohm[Ω], Microhm[Ω], Volt per Ampere[Ω] are the few other units in which Fault Impedance using Positive Sequence Current (LLF) can be measured.

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