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

GoA-Phase EMF using Positive Sequence Current and Voltage(LLF) Formula

GoA-Phase EMF using Positive Sequence Voltage(LLF) Formula

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A phase EMF is defined as the electromagnetic force of the a-phase in open conductor fault. Check FAQs

E a = I 1 \cdot (Z 1 + Z 2 + Z f)

E_a - A Phase EMF?I₁ - Positive Sequence Current?Z₁ - Positive Sequence Impedance?Z₂ - Negative Sequence Impedance?Z_f - Fault Impedance?

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

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Here is how the A-Phase EMF using Positive Sequence Current and Sequence Impedances(LLF) equation looks like with Values.

Here is how the A-Phase EMF using Positive Sequence Current and Sequence Impedances(LLF) equation looks like with Units.

Here is how the A-Phase EMF using Positive Sequence Current and Sequence Impedances(LLF) equation looks like.

-70.3552 = 2.001 \cdot (7.94 + -44.6 + 1.5)

-70.3552V = 2.001A \cdot (7.94Ω + -44.6Ω + 1.5Ω)

-70.3552 = 2.001 \cdot (7.94 + -44.6 + 1.5)

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

Follow our step by step solution on how to calculate A-Phase EMF using Positive Sequence Current and Sequence Impedances(LLF)?

FIRST Step Consider the formula

E a = I 1 \cdot (Z 1 + Z 2 + Z f)

Next Step Substitute values of Variables

∴

E a = 2.001A \cdot (7.94Ω + -44.6Ω + 1.5Ω)

Next Step Prepare to Evaluate

∴

E a = 2.001 \cdot (7.94 + -44.6 + 1.5)

Next Step Evaluate

∴

E a = -70.35516V

LAST Step Rounding Answer

∴

E a = -70.3552V

A-Phase EMF using Positive Sequence Current and Sequence Impedances(LLF) Formula Elements

Variables

A Phase EMF

A phase EMF is defined as the electromagnetic force of the a-phase in open conductor fault.

Symbol: E_a

Measurement: Electric PotentialUnit: V

Note: Value can be positive or negative.

Formulas to find A Phase EMF

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

Positive Sequence Impedance

Positive Sequence Impedance consists of balanced three-phase voltage and current phasors which are exactly at 120 degrees apart rotating counterclockwise in ABC rotation.

Symbol: Z₁

Measurement: Electric ResistanceUnit: Ω

Note: Value should be greater than 0.

Formulas to find Positive Sequence Impedance

Negative Sequence Impedance

Negative Sequence Impedance consists of balanced three-phase impedance phasors which are exactly at 120 degrees apart rotating counterclockwise in ACB rotation.

Symbol: Z₂

Measurement: Electric ResistanceUnit: Ω

Note: Value can be positive or negative.

Formulas to find Negative Sequence Impedance

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

Other Formulas to find A Phase EMF

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

E a = V 1 + Z 1 \cdot I 1

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

E a = \frac{V 1 \cdot (Z 1 + Z 2)}{Z 2}

Go A-Phase EMF using Fault Current(LLF)

E a = \frac{I f \cdot (Z 1 + Z 2)}{\sqrt{3}}

Other formulas in Voltage and EMF category

Go B-Phase Voltage (LLF)

V b = (Z f \cdot I b) + V c

Go C-Phase Voltage (LLF)

V c = V b - (Z f \cdot I b)

Go C-Phase Voltage using C-Phase Current (LLF)

V c = V b + (Z f \cdot I c)

Go B-Phase Voltage using C-Phase Current (LLF)

V b = V c - (Z f \cdot I c)

How to Evaluate A-Phase EMF using Positive Sequence Current and Sequence Impedances(LLF)?

A-Phase EMF using Positive Sequence Current and Sequence Impedances(LLF) evaluator uses A Phase EMF = Positive Sequence Current*(Positive Sequence Impedance+Negative Sequence Impedance+Fault Impedance) to evaluate the A Phase EMF, The A-phase EMF using Positive Sequence Current and Sequence Impedances(LLF) formula is defined as the electrical potential difference that is present in one phase of a three-phase electrical power system during a fault condition. A Phase EMF is denoted by E_a symbol.

How to evaluate A-Phase EMF using Positive Sequence Current and Sequence Impedances(LLF) using this online evaluator? To use this online evaluator for A-Phase EMF using Positive Sequence Current and Sequence Impedances(LLF), enter Positive Sequence Current (I₁), Positive Sequence Impedance (Z₁), Negative Sequence Impedance (Z₂) & Fault Impedance (Z_f) and hit the calculate button.

FAQs on A-Phase EMF using Positive Sequence Current and Sequence Impedances(LLF)

What is the formula to find A-Phase EMF using Positive Sequence Current and Sequence Impedances(LLF)?

The formula of A-Phase EMF using Positive Sequence Current and Sequence Impedances(LLF) is expressed as A Phase EMF = Positive Sequence Current*(Positive Sequence Impedance+Negative Sequence Impedance+Fault Impedance). Here is an example- 108.134 = 2.001*(7.94+(-44.6)+1.5).

How to calculate A-Phase EMF using Positive Sequence Current and Sequence Impedances(LLF)?

With Positive Sequence Current (I₁), Positive Sequence Impedance (Z₁), Negative Sequence Impedance (Z₂) & Fault Impedance (Z_f) we can find A-Phase EMF using Positive Sequence Current and Sequence Impedances(LLF) using the formula - A Phase EMF = Positive Sequence Current*(Positive Sequence Impedance+Negative Sequence Impedance+Fault Impedance).

What are the other ways to Calculate A Phase EMF?

Here are the different ways to Calculate A Phase EMF-

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

Can the A-Phase EMF using Positive Sequence Current and Sequence Impedances(LLF) be negative?

Yes, the A-Phase EMF using Positive Sequence Current and Sequence Impedances(LLF), measured in Electric Potential can be negative.

Which unit is used to measure A-Phase EMF using Positive Sequence Current and Sequence Impedances(LLF)?

A-Phase EMF using Positive Sequence Current and Sequence Impedances(LLF) is usually measured using the Volt[V] for Electric Potential. Millivolt[V], Microvolt[V], Nanovolt[V] are the few other units in which A-Phase EMF using Positive Sequence Current and Sequence Impedances(LLF) can be measured.

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

​GoA-Phase EMF using Positive Sequence Current and Voltage(LLF) Formula

​GoA-Phase EMF using Positive Sequence Voltage(LLF) Formula

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

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

A-Phase EMF using Positive Sequence Current and Sequence Impedances(LLF) Formula Elements

Other Formulas to find A Phase EMF

Other formulas in Voltage and EMF category

How to Evaluate A-Phase EMF using Positive Sequence Current and Sequence Impedances(LLF)?

FAQs on A-Phase EMF using Positive Sequence Current and Sequence Impedances(LLF)

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GoA-Phase EMF using Positive Sequence Current and Voltage(LLF) Formula

GoA-Phase EMF using Positive Sequence Voltage(LLF) Formula