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Fault Impedance using Sequence Voltages and Zero Sequence Current(LLGF) Formula

GoFault Impedance using C-Phase Voltage (LLGF) Formula

GoFault Impedance using B-Phase Voltage (LLGF) 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 0 - V 1}{3 \cdot I 0}

Z_f - Fault Impedance?V₀ - Zero Sequence Voltage?V₁ - Positive Sequence Voltage?I₀ - Zero Sequence Current?

Fault Impedance using Sequence Voltages and Zero Sequence Current(LLGF) Example

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Here is how the Fault Impedance using Sequence Voltages and Zero Sequence Current(LLGF) equation looks like with Values.

Here is how the Fault Impedance using Sequence Voltages and Zero Sequence Current(LLGF) equation looks like with Units.

Here is how the Fault Impedance using Sequence Voltages and Zero Sequence Current(LLGF) equation looks like.

0.0152 = \frac{17.6 - 17.5}{3 \cdot 2.2}

0.0152Ω = \frac{17.6V - 17.5V}{3 \cdot 2.2A}

0.0152 = \frac{17.6 - 17.5}{3 \cdot 2.2}

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Fault Impedance using Sequence Voltages and Zero Sequence Current(LLGF) Solution

Follow our step by step solution on how to calculate Fault Impedance using Sequence Voltages and Zero Sequence Current(LLGF)?

FIRST Step Consider the formula

Z f = \frac{V 0 - V 1}{3 \cdot I 0}

Next Step Substitute values of Variables

∴

Z f = \frac{17.6V - 17.5V}{3 \cdot 2.2A}

Next Step Prepare to Evaluate

∴

Z f = \frac{17.6 - 17.5}{3 \cdot 2.2}

Next Step Evaluate

∴

Z f = 0.0151515151515154Ω

LAST Step Rounding Answer

∴

Z f = 0.0152Ω

Fault Impedance using Sequence Voltages and Zero Sequence Current(LLGF) 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

Zero Sequence Voltage

Zero Sequence Voltage consists of a balanced three-phase voltage and current, phasors of which all have the same phase angles and rotate counterclockwise together.

Symbol: V₀

Measurement: Electric PotentialUnit: V

Note: Value can be positive or negative.

Formulas to find Zero 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

Zero Sequence Current

Zero Sequence Current consists of a balanced three-phase current, phasors of which all have the same phase angles and rotate counterclockwise together.

Symbol: I₀

Measurement: Electric CurrentUnit: A

Note: Value can be positive or negative.

Formulas to find Zero Sequence Current

Other Formulas to find Fault Impedance

Go Fault Impedance using C-Phase Voltage (LLGF)

Z f = \frac{V c}{3 \cdot I 0}

Go Fault Impedance using B-Phase Voltage (LLGF)

Z f = \frac{V b}{3 \cdot I 0}

Other formulas in Impedance category

Go Positive Sequence Impedance using A-Phase EMF(LLGF)

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

Go Zero Sequence Impedance(LLGF)

Z 0 = - \frac{V 0}{I 0}

Go Negative Sequence Impedance(LLGF)

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

How to Evaluate Fault Impedance using Sequence Voltages and Zero Sequence Current(LLGF)?

Fault Impedance using Sequence Voltages and Zero Sequence Current(LLGF) evaluator uses Fault Impedance = (Zero Sequence Voltage-Positive Sequence Voltage)/(3*Zero Sequence Current) to evaluate the Fault Impedance, The Fault Impedance using Sequence Voltages and Zero Sequence Current(LLGF) formula is defined as the impedance which is connected to the earth. Fault Impedance is denoted by Z_f symbol.

How to evaluate Fault Impedance using Sequence Voltages and Zero Sequence Current(LLGF) using this online evaluator? To use this online evaluator for Fault Impedance using Sequence Voltages and Zero Sequence Current(LLGF), enter Zero Sequence Voltage (V₀), Positive Sequence Voltage (V₁) & Zero Sequence Current (I₀) and hit the calculate button.

FAQs on Fault Impedance using Sequence Voltages and Zero Sequence Current(LLGF)

What is the formula to find Fault Impedance using Sequence Voltages and Zero Sequence Current(LLGF)?

The formula of Fault Impedance using Sequence Voltages and Zero Sequence Current(LLGF) is expressed as Fault Impedance = (Zero Sequence Voltage-Positive Sequence Voltage)/(3*Zero Sequence Current). Here is an example- 0.621212 = (17.6-17.5)/(3*2.2).

How to calculate Fault Impedance using Sequence Voltages and Zero Sequence Current(LLGF)?

With Zero Sequence Voltage (V₀), Positive Sequence Voltage (V₁) & Zero Sequence Current (I₀) we can find Fault Impedance using Sequence Voltages and Zero Sequence Current(LLGF) using the formula - Fault Impedance = (Zero Sequence Voltage-Positive Sequence Voltage)/(3*Zero Sequence Current).

What are the other ways to Calculate Fault Impedance?

Here are the different ways to Calculate Fault Impedance-

Fault Impedance=C Phase Voltage/(3*Zero Sequence Current)
Fault Impedance=B Phase Voltage/(3*Zero Sequence Current)

Can the Fault Impedance using Sequence Voltages and Zero Sequence Current(LLGF) be negative?

No, the Fault Impedance using Sequence Voltages and Zero Sequence Current(LLGF), measured in Electric Resistance cannot be negative.

Which unit is used to measure Fault Impedance using Sequence Voltages and Zero Sequence Current(LLGF)?

Fault Impedance using Sequence Voltages and Zero Sequence Current(LLGF) 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 Sequence Voltages and Zero Sequence Current(LLGF) can be measured.

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