**What are Sequence Voltages?**

The positive sequence is made up of three-phase voltage & current phasors that are balanced and rotate in an ABC rotation; these phasors are exactly 120 degrees apart from one another.

The negative sequence is made up of 3-phase voltage & current phasors that are balanced and rotate counterclockwise in ACB rotation. These phasors are exactly 120^{0} apart from one another.

A balanced three-phase voltage and current is what makes up zero sequence. The phasors of zero sequence all have the same phase angles & rotate together in a counterclockwise direction.

**How do you find the Negative Sequence Voltage?**

The Negative Sequence Voltage (LLF) formula is defined as consisting of balanced three-phase voltage and current phasors that are exactly 120 degrees apart and rotate counterclockwise in ACB rotation.

The sign V2 denotes negative sequence voltage.

**Negative Sequence Voltage (LLF) Formula**

The Negative Sequence Voltage (LLF) calculator calculates Negative Sequence Voltage as

**Negative Sequence Voltage = Positive Sequence Voltage – (Fault Impedance X Positive Sequence Current)**

**V2 = V1 – (Zf X I1)**

Where,

V2 – Negative Sequence Voltage (Measured in Volt) represents balanced three-phase voltage & current phasors that are 120° apart revolving counterclockwise in ACB rotation.

V1 – Positive Sequence Voltage (Measured in Volt) – Balanced three-phase voltage & current phasors are 120° apart and rotate counterclockwise in ABC.

Zf – Fault impedance (measured in Ohm) – In case of a fault, fault impedance (measured in Ω) is used to determine fault current.

I1 – Positive Sequence Current (Measured in Ampere) – Balanced three-phase voltage & current phasors are 120° apart and rotate counterclockwise in ABC.

**How to use this online calculator to calculate the Negative Sequence Voltage (LLF)? **

To utilize this online calculator for Negative Sequence Voltage (LLF),

enter

- Positive Sequence Voltage (V1),
- Fault Impedance (Zf), and
- Positive Sequence Current (I1) and
- Output Value is derived.

Here is how the Negative Sequence Voltage (LLF) calculation might be explained using the provided input values.

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