transmission line fault

1. GREEN UNIVERSITY
OF BANGLADESH
Department: EEE (Eve)
Prepared By:
ID# 143010003
Course Title: Power System I
Prepared For:
Professor Dr. Md. Quamrul Ahsan
Professor, GUB

2. UNSYMMETRIC
AL FAULT

3. Introduction
Generator, transformer , and transmission line
The fault which gives rise to unsymmetrical fault
current are known as unsymmetrical fault.
It makes system unbalanced.

4. Types
Single line to ground fault
Line to line fault
Double line to ground fault

5.  Single line to Ground
fault
Zf

6.  Line to Line fault
Zf

7.  Double Line to Ground
fault
Zf

8. How can fault occur
Falling of tree on line
Wind and ice loading on transmission line
Vehicle colliding with supporting structures
Birds shorting on lines
Insulation failure