Fault Current (LLGF) Calculator

✖B phase Current is defined as the current flowing through the b-phase in open conductor fault.ⓘ B Phase Current [I_b]			+10% -10%
✖C phase current is the current that flows into the c-phase in open conductor fault.ⓘ C Phase Current [I_c]			+10% -10%

✖The fault current is the electrical current which flows through a circuit during an electrical fault condition.ⓘ Fault Current (LLGF) [I_f]

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Formula

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Fault Current (LLGF)

Formula

`"I"_{"f"} = "I"_{"b"}+"I"_{"c"}`

Example

`"6.6A"="2.7A"+"3.9A"`

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Fault Current (LLGF) Solution

STEP 0: Pre-Calculation Summary

Formula Used

Fault Current = B Phase Current+C Phase Current
I_f = I_b+I_c
This formula uses 3 Variables

Variables Used

Fault Current - (Measured in Ampere) - The fault current is the electrical current which flows through a circuit during an electrical fault condition.
B Phase Current - (Measured in Ampere) - B phase Current is defined as the current flowing through the b-phase in open conductor fault.
C Phase Current - (Measured in Ampere) - C phase current is the current that flows into the c-phase in open conductor fault.

STEP 1: Convert Input(s) to Base Unit

B Phase Current: 2.7 Ampere --> 2.7 Ampere No Conversion Required
C Phase Current: 3.9 Ampere --> 3.9 Ampere No Conversion Required

STEP 2: Evaluate Formula

Substituting Input Values in Formula

I_f = I_b+I_c --> 2.7+3.9

Evaluating ... ...

I_f = 6.6

STEP 3: Convert Result to Output's Unit

6.6 Ampere --> No Conversion Required

FINAL ANSWER

6.6 Ampere <-- Fault Current

(Calculation completed in 00.004 seconds)

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Home » Engineering » Electrical » Power System » Fault » Shunt Faults » Unsymmetrical Faults » L-L-G Fault » Current » Fault Current (LLGF)

Credits

Created by Urvi Rathod

Vishwakarma Government Engineering College (VGEC), Ahmedabad

Urvi Rathod has created this Calculator and 1500+ more calculators!

Verified by Payal Priya

Birsa Institute of Technology (BIT), Sindri

Payal Priya has verified this Calculator and 1900+ more calculators!

< 16 Current Calculators

Positive Sequence Current using A-Phase EMF and Sequence Impedances(LLGF)

Go Positive Sequence Current = A Phase EMF/(Positive Sequence Impedance+(Negative Sequence Impedance*(Zero Sequence Impedance+3*Fault Impedance))/(Zero Sequence Impedance+Negative Sequence Impedance+3*Fault Impedance))

Negative Sequence Current using Positive Sequence Current and Sequence Impedances(LLGF)

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

Zero Sequence Current using Positive Sequence Current and Sequence Impedances(LLGF)

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

Positive Sequence Current using Positive Sequence Voltage (LLGF)

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

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

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

B-Phase Current using B-Phase Voltage(LLGF)

Go B Phase Current = B Phase Voltage/Fault Impedance-C Phase Current

C-Phase Current using C-Phase Voltage(LLGF)

Go C Phase Current = C Phase Voltage/Fault Impedance-B Phase Current

Negative Sequence Current using Negative Sequence Voltage (LLGF)

Go Negative Sequence Current = (-1)*Negative Sequence Voltage/Negative Sequence Impedance

Zero Sequence Current using Zero Sequence Voltage (LLGF)

Go Zero Sequence Current = (-1)*Zero Sequence Voltage/Zero Sequence Impedance

Zero Sequence Current using B-Phase Voltage (LLGF)

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

Zero Sequence Current using C-Phase Voltage (LLGF)

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

Fault Current using B-Phase Voltage (LLGF)

Go Fault Current = B Phase Voltage/Fault Impedance

Fault Current using C-Phase Voltage (LLGF)

Go Fault Current = C Phase Voltage/Fault Impedance

B-Phase Current (LLGF)

Go B Phase Current = Fault Current-C Phase Current

C-Phase Current (LLGF)

Go C Phase Current = Fault Current-B Phase Current

Fault Current (LLGF)

Go Fault Current = B Phase Current+C Phase Current

Fault Current (LLGF) Formula

Fault Current = B Phase Current+C Phase Current
I_f = I_b+I_c

What is fault impedance and current?

Fault Current for the double line to ground fault(LLGF) is defined as the current that flows into the fault Impedance and fault impedance is defined as the impedance which is connected to the earth.

How to Calculate Fault Current (LLGF)?

Fault Current (LLGF) calculator uses Fault Current = B Phase Current+C Phase Current to calculate the Fault Current, The Fault current (LLGF) formula is defined as the current that flows into the fault Impedance. the fault current is the addition of the b-phase current and c-phase current. Fault Current is denoted by I_f symbol.

How to calculate Fault Current (LLGF) using this online calculator? To use this online calculator for Fault Current (LLGF), enter B Phase Current (I_b) & C Phase Current (I_c) and hit the calculate button. Here is how the Fault Current (LLGF) calculation can be explained with given input values -> 6.6 = 2.7+3.9.

FAQ

What is Fault Current (LLGF)?

The Fault current (LLGF) formula is defined as the current that flows into the fault Impedance. the fault current is the addition of the b-phase current and c-phase current and is represented as I_f = I_b+I_c or Fault Current = B Phase Current+C Phase Current. B phase Current is defined as the current flowing through the b-phase in open conductor fault & C phase current is the current that flows into the c-phase in open conductor fault.

How to calculate Fault Current (LLGF)?

The Fault current (LLGF) formula is defined as the current that flows into the fault Impedance. the fault current is the addition of the b-phase current and c-phase current is calculated using Fault Current = B Phase Current+C Phase Current. To calculate Fault Current (LLGF), you need B Phase Current (I_b) & C Phase Current (I_c). With our tool, you need to enter the respective value for B Phase Current & C Phase 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 Current?

In this formula, Fault Current uses B Phase Current & C Phase Current. We can use 2 other way(s) to calculate the same, which is/are as follows -

Fault Current = B Phase Voltage/Fault Impedance
Fault Current = C Phase Voltage/Fault Impedance

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