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

✖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.ⓘ Zero Sequence Voltage [V₀]			+10% -10%
✖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%
✖Zero Sequence Current consists of a balanced three-phase current, phasors of which all have the same phase angles and rotate counterclockwise together.ⓘ Zero Sequence Current [I₀]			+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 using Sequence Voltages and Zero Sequence Current(LLGF) [Z_f]

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Formula

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

Formula

`"Z"_{"f"} = ("V"_{"0"}-"V"_{"1"})/(3*"I"_{"0"})`

Example

`"0.015152Ω"=("17.6V"-"17.5V")/(3*"2.20A")`

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

STEP 0: Pre-Calculation Summary

Formula Used

Fault Impedance = (Zero Sequence Voltage-Positive Sequence Voltage)/(3*Zero Sequence Current)
Z_f = (V₀-V₁)/(3*I₀)
This formula uses 4 Variables

Variables Used

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.
Zero Sequence Voltage - (Measured in Volt) - 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.
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.
Zero Sequence Current - (Measured in Ampere) - Zero Sequence Current consists of a balanced three-phase current, phasors of which all have the same phase angles and rotate counterclockwise together.

STEP 1: Convert Input(s) to Base Unit

Zero Sequence Voltage: 17.6 Volt --> 17.6 Volt No Conversion Required
Positive Sequence Voltage: 17.5 Volt --> 17.5 Volt No Conversion Required
Zero Sequence Current: 2.2 Ampere --> 2.2 Ampere No Conversion Required

STEP 2: Evaluate Formula

Substituting Input Values in Formula

Z_f = (V₀-V₁)/(3*I₀) --> (17.6-17.5)/(3*2.2)

Evaluating ... ...

Z_f = 0.0151515151515154

STEP 3: Convert Result to Output's Unit

0.0151515151515154 Ohm --> No Conversion Required

FINAL ANSWER

0.0151515151515154 ≈ 0.015152 Ohm <-- Fault Impedance

(Calculation completed in 00.004 seconds)

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Home » Engineering » Electrical » Power System » Fault » Shunt Faults » Unsymmetrical Faults » L-L-G Fault » Impedance » Fault Impedance using Sequence Voltages and Zero Sequence Current(LLGF)

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< 6 Impedance Calculators

Positive Sequence Impedance using A-Phase EMF(LLGF)

Go Positive Sequence Impedance = (A Phase EMF-Positive Sequence Voltage)/Positive Sequence Current

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

Go Fault Impedance = (Zero Sequence Voltage-Positive Sequence Voltage)/(3*Zero Sequence Current)

Negative Sequence Impedance(LLGF)

Go Negative Sequence Impedance = -Negative Sequence Voltage/Negative Sequence Current

Zero Sequence Impedance(LLGF)

Go Zero Sequence Impedance = -Zero Sequence Voltage/Zero Sequence Current

Fault Impedance using C-Phase Voltage (LLGF)

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

Fault Impedance using B-Phase Voltage (LLGF)

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

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

Fault Impedance = (Zero Sequence Voltage-Positive Sequence Voltage)/(3*Zero Sequence Current)
Z_f = (V₀-V₁)/(3*I₀)

What is a double line to ground fault?

A double line to ground fault is a type of fault that can occur in an electrical power system. It is characterized by two of the three conductors in a three-phase power system coming into contact with the ground or earth.

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

Fault Impedance using Sequence Voltages and Zero Sequence Current(LLGF) calculator uses Fault Impedance = (Zero Sequence Voltage-Positive Sequence Voltage)/(3*Zero Sequence Current) to calculate 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 calculate Fault Impedance using Sequence Voltages and Zero Sequence Current(LLGF) using this online calculator? To use this online calculator 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. Here is how the Fault Impedance using Sequence Voltages and Zero Sequence Current(LLGF) calculation can be explained with given input values -> 0.621212 = (17.6-17.5)/(3*2.2).

FAQ

What is Fault Impedance using Sequence Voltages and Zero Sequence Current(LLGF)?

The Fault Impedance using Sequence Voltages and Zero Sequence Current(LLGF) formula is defined as the impedance which is connected to the earth and is represented as Z_f = (V₀-V₁)/(3*I₀) or Fault Impedance = (Zero Sequence Voltage-Positive Sequence Voltage)/(3*Zero Sequence Current). 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, Positive Sequence Voltage consists of balanced three-phase voltage and current phasors which are exactly at 120 degrees apart rotating counterclockwise in ABC rotation & Zero Sequence Current consists of a balanced three-phase current, phasors of which all have the same phase angles and rotate counterclockwise together.

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

The Fault Impedance using Sequence Voltages and Zero Sequence Current(LLGF) formula is defined as the impedance which is connected to the earth is calculated using Fault Impedance = (Zero Sequence Voltage-Positive Sequence Voltage)/(3*Zero Sequence Current). To calculate Fault Impedance using Sequence Voltages and Zero Sequence Current(LLGF), you need Zero Sequence Voltage (V₀), Positive Sequence Voltage (V₁) & Zero Sequence Current (I₀). With our tool, you need to enter the respective value for Zero Sequence Voltage, Positive Sequence Voltage & Zero 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 Fault Impedance?

In this formula, Fault Impedance uses Zero Sequence Voltage, Positive Sequence Voltage & Zero Sequence Current. We can use 2 other way(s) to calculate the same, which is/are as follows -

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

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