Fault Impedance using Positive Sequence Current (LLF) Calculator

✖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%
✖Negative Sequence Voltage consists of balanced three-phase voltage and current phasors which are exactly at 120 degrees apart rotating counterclockwise in ACB rotation.ⓘ Negative Sequence Voltage [V₂]			+10% -10%
✖Positive Sequence Current consists of balanced three-phase voltage and current phasors which are exactly at 120 degrees apart rotating counterclockwise in ABC rotation.ⓘ Positive Sequence Current [I₁]			+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 Positive Sequence Current (LLF) [Z_f]

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Fault Impedance using Positive Sequence Current (LLF)

Formula

`"Z"_{"f"} = ("V"_{"1"}-"V"_{"2"})/"I"_{"1"}`

Example

`"0.721639Ω"=("17.5V"-"16.056V")/"2.001A"`

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Fault Impedance using Positive Sequence Current (LLF) Solution

STEP 0: Pre-Calculation Summary

Formula Used

Fault Impedance = (Positive Sequence Voltage-Negative Sequence Voltage)/Positive Sequence Current
Z_f = (V₁-V₂)/I₁
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.
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.
Negative Sequence Voltage - (Measured in Volt) - Negative Sequence Voltage consists of balanced three-phase voltage and current phasors which are exactly at 120 degrees apart rotating counterclockwise in ACB rotation.
Positive Sequence Current - (Measured in Ampere) - Positive Sequence Current consists of balanced three-phase voltage and current phasors which are exactly at 120 degrees apart rotating counterclockwise in ABC rotation.

STEP 1: Convert Input(s) to Base Unit

Positive Sequence Voltage: 17.5 Volt --> 17.5 Volt No Conversion Required
Negative Sequence Voltage: 16.056 Volt --> 16.056 Volt No Conversion Required
Positive Sequence Current: 2.001 Ampere --> 2.001 Ampere No Conversion Required

STEP 2: Evaluate Formula

Substituting Input Values in Formula

Z_f = (V₁-V₂)/I₁ --> (17.5-16.056)/2.001

Evaluating ... ...

Z_f = 0.721639180409795

STEP 3: Convert Result to Output's Unit

0.721639180409795 Ohm --> No Conversion Required

FINAL ANSWER

0.721639180409795 ≈ 0.721639 Ohm <-- Fault Impedance

(Calculation completed in 00.004 seconds)

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< 4 Impedance Calculators

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

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

Fault Impedance using A-Phase EMF(LLF)

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

Fault Impedance using Positive Sequence Current (LLF)

Go Fault Impedance = (Positive Sequence Voltage-Negative Sequence Voltage)/Positive Sequence Current

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

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

Fault Impedance using Positive Sequence Current (LLF) Formula

Fault Impedance = (Positive Sequence Voltage-Negative Sequence Voltage)/Positive Sequence Current
Z_f = (V₁-V₂)/I₁

What are sequence currents?

The unbalanced current flows in the circuit during the earth fault is known as the zero-sequence current or the DC component of the fault current. The zero phase sequence means the magnitude of three phases has zero phase displacement.

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

Fault Impedance using Positive Sequence Current (LLF) calculator uses Fault Impedance = (Positive Sequence Voltage-Negative Sequence Voltage)/Positive Sequence Current to calculate 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 calculate Fault Impedance using Positive Sequence Current (LLF) using this online calculator? To use this online calculator 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. Here is how the Fault Impedance using Positive Sequence Current (LLF) calculation can be explained with given input values -> -1.277361 = (17.5-16.056)/2.001.

FAQ

What is Fault Impedance using Positive Sequence Current (LLF)?

The Fault Impedance using Positive Sequence Current (LLF) formula is defined as the impedance that is connected to the ground or earth and is represented as Z_f = (V₁-V₂)/I₁ or Fault Impedance = (Positive Sequence Voltage-Negative Sequence Voltage)/Positive Sequence Current. Positive Sequence Voltage consists of balanced three-phase voltage and current phasors which are exactly at 120 degrees apart rotating counterclockwise in ABC rotation, Negative Sequence Voltage consists of balanced three-phase voltage and current phasors which are exactly at 120 degrees apart rotating counterclockwise in ACB rotation & Positive Sequence Current consists of balanced three-phase voltage and current phasors which are exactly at 120 degrees apart rotating counterclockwise in ABC rotation.

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

The Fault Impedance using Positive Sequence Current (LLF) formula is defined as the impedance that is connected to the ground or earth is calculated using Fault Impedance = (Positive Sequence Voltage-Negative Sequence Voltage)/Positive Sequence Current. To calculate Fault Impedance using Positive Sequence Current (LLF), you need Positive Sequence Voltage (V₁), Negative Sequence Voltage (V₂) & Positive Sequence Current (I₁). With our tool, you need to enter the respective value for Positive Sequence Voltage, Negative Sequence Voltage & Positive 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 Positive Sequence Voltage, Negative Sequence Voltage & Positive Sequence Current. We can use 1 other way(s) to calculate the same, which is/are as follows -

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

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