Analyze Unbalance with Symmetrical Components
// From Phases to Sequences

An interactive tool for analyzing three-phase power systems

Understanding Symmetrical Components

A mathematical technique that transforms complex three-phase power systems into simple, balanced components for easier analysis and system design.

1

Positive Sequence

Three equal magnitude phasors, separated by 120° intervals, rotating in the normal phase sequence (A-B-C). Represents the balanced portion of the system that generates useful torque.

2

Negative Sequence

Three equal magnitude phasors, separated by 120° intervals, rotating in the reverse phase sequence (A-C-B). Creates opposing torque and indicates system imbalance.

0

Zero Sequence

Three equal magnitude phasors aligned in phase (0° separation). Indicates ground faults and would not exist in a perfectly balanced three-phase system.

Applications

Fault Analysis

Enables precise diagnosis of different fault types in power systems.

Protective Relays

Allows for designing relay systems that respond appropriately to faults.

System Imbalance

Quantifies the degree of asymmetry in power systems for correction.

System Modeling

Simulates behavior under various unbalanced conditions.

Use the calculator below to transform three-phase quantities into their symmetrical components.

Phase A

V
°

Phase B

V
°

Phase C

V
°

Symmetrical Components

Positive Sequence

0 V

Negative Sequence

0 V

Zero Sequence

0 V

Phasor Diagram