Symmetrical Components and Fault Analysis for Desklib

This article explains the concept of Symmetrical Components and Fault Analysis with solved examples and calculations. It covers Single Line to Ground Fault, Line to Line Fault, and Double Line to Ground Fault. The article also provides study material, solved assignments, essays, and dissertations on Desklib.

SYMMETERICAL COMPONENTS AND FAULT
Positive sequence component consisting of three phasors equal in magnitude, displaced from each other by in phase, and
having the phase sequence as the original phasor.
Negative sequence component consisting of three three phasors equal in magnitude, displaced from each other by in phase,
and having the phase sequence opposite to original to that of the original phasors.
Zero sequence component consisting of have three phasors equaled in magnitude and with zero phasor displacement from each
other.
SINGLE LINE TO GROUND FAULT (L-G):
1. Most frequently occurring fault.
2. Usually assumed the fault on phase- R for analysis purposes, phase- Y and phase-B healthy.
As per given data in question, that fault occur in bus bar 4, we can determine the positive sequence, negative sequence and zero
sequence component by Thevenin equivalent reactance, as shown in figure-1.

Determine positvie sequence reactance.
As per given data in question, that fault occur in bus bar 4, we can determine the positive sequence, negative sequence and zero
sequence component by Thevenin equivalent reactance, as shown in figure-2.

Determine the negative sequence reactance.
The zero sequence Thevenin equivalent reactance, as shown in figure-3.

Determine the zero sequence reactance.
Determine the postive sequece or negative sequnce or zero sequence current.
Determine positive sequence voltage.
Determine negative sequence voltage.
Determine zero sequence voltage.
Determine R-phase, Y-phase and B-phase current.

Determine the R-PHASE ,Y-PHASE and B-PHASE voltage.

LINE TO LINE FAULT (L-L):
1. The connection of sequence current are connected in parallel.
2. The phasor difference between and for line to line fault should be .
Determine the positive sequence and negative sequence current.

Determine positive sequence voltage.
Determine negative sequence voltage.
Determine zero sequence voltage.
Determine R-phase, Y-phase and B-phase current.

Determine the R-PHASE ,Y-PHASE and B-PHASE voltage.
DOUBLE LINE TO GROUND FAULT (L-L-G):
Determine positive sequence current.
Determine negative sequence current.

Determine zero sequence current.
Determine positive sequence voltage.
Determine negative sequence voltage.
Determine zerosequence voltage.
Determine R-phase, Y-phase and B-phase current.

Determine the R-PHASE ,Y-PHASE and B-PHASE voltage.

(1)
SINGLE LINE TO GROUND FAULT (L-G):
1. Most frequently occurring fault.
2. Usually assumed the fault on phase- R for analysis purposes, phase- Y and phase-B healthy.
As per given data in question, that fault occur in bus bar 4, we can determine the positive sequence, negative sequence and zero
sequence component by Thevenin equivalent reactance, as shown in figure-1.
Determine positvie sequence reactance.

As per given data in question, that fault occur in bus bar 4, we can determine the positive sequence, negative sequence and zero
sequence component by Thevenin equivalent reactance, as shown in figure-2.

Determine negative sequence reactance.
The zero sequence Thevenin equivalent reactance, as shown in figure-3.

Determine zero sequence reactance.
Determine positive or negative or zero sequence current.
Determine positive sequence voltage.
Determine negative sequence voltage.
Determine zerosequence voltage.

Determine R-phase, Y-phase and B-phase current.

(2)
SINGLE LINE TO GROUND FAULT (L-G):
1. Most frequently occurring fault.
2. Usually assumed the fault on phase- R for analysis purposes, phase- Y and phase-B healthy.
As per given data in question, that fault occur in bus bar 4, we can determine the positive sequence, negative sequence and zero
sequence component by Thevenin equivalent reactance, as shown in figure-1.
Determine positvie sequence reactance.

As per given data in question, that fault occur in bus bar 4, we can determine the positive sequence, negative sequence and zero
sequence component by Thevenin equivalent reactance, as shown in figure-2.

Determine negative sequence reactance.
The zero sequence Thevenin equivalent reactance, as shown in figure-3.

Determine zero sequence reactance.
Determine positive or negative or zero sequence current.
Determine positive sequence voltage.
Determine negative sequence voltage.
Determine zerosequence voltage.

Determine R-phase, Y-phase and B-phase current.
(3)
SINGLE LINE TO GROUND FAULT (L-G):
1. Most frequently occurring fault.
2. Usually assumed the fault on phase- R for analysis purposes, phase- Y and phase-B healthy.

As per given data in question, that fault occur in bus bar 4, we can determine the positive sequence, negative sequence and zero
sequence component by Thevenin equivalent reactance, as shown in figure-1.
Determine positvie sequence reactance.

As per given data in question, that fault occur in bus bar 4, we can determine the positive sequence, negative sequence and zero
sequence component by Thevenin equivalent reactance, as shown in figure-2.

Determine negative sequence reactance.
The zero sequence Thevenin equivalent reactance, as shown in figure-3.

Determine zero sequence reactance.
Determine positive or negative or zero sequence current.
Determine positive sequence voltage.
Determine negative sequence voltage.
Determine zerosequence voltage.

Determine R-phase, Y-phase and B-phase current.

(4)
SINGLE LINE TO GROUND FAULT (L-G):
1. Most frequently occurring fault.
2. Usually assumed the fault on phase- R for analysis purposes, phase- Y and phase-B healthy.
As per given data in question, that fault occur in bus bar 4, we can determine the positive sequence, negative sequence and zero
sequence component by Thevenin equivalent reactance, as shown in figure-1.
Determine positvie sequence reactance.

As per given data in question, that fault occur in bus bar 4, we can determine the positive sequence, negative sequence and zero
sequence component by Thevenin equivalent reactance, as shown in figure-2.

Determine negative sequence reactance.
The zero sequence Thevenin equivalent reactance, as shown in figure-3.

Determine zero sequence reactance.
Determine positive or negative or zero sequence current.
Determine positive sequence voltage.
Determine negative sequence voltage.
Determine zerosequence voltage.

Determine R-phase, Y-phase and B-phase current.