Download - Symmetrical and un-symmetrical fault
Symmetrical & Unsymmetrical Fault In
Three Phase Transmission Line
Prepared By:Siddiqui Arshad hussain
Contents
1. Introduction
2. Types of Fault
3. Symmetrical Fault
4. Unsymmetrical Fault
5. Transient in RL series circuit
6. Selection of C.B.
7. Types of C.B.
• Under normal conditions, a power system operates under balanced conditions with all equipments carrying normal load currents and the bus voltages within the prescribed limits.
• This condition can be disrupted due to a fault in the system.
Types of Fault1. Symmetrical fault
1. LLL fault2. LLLG fault
2. Unsymmetrical fault1. LG2. LL3. LLG
Selection of C.B.• Voltage Rating• Frequency• Maximum interrupting capacity• Continues current rating• Types of operating mechanism used• Operating condition• Maintenance and testing• Cost
Types of C.B.
• Oil Circuit breaker• Air blast Circuit breaker• Vacuum Circuit breaker• Sf6 Circuit breaker
Reference• http://www.electrical-installation.org/enwiki/Select
ion_of_a_circuit-breaker• http://www.electrical-installation.org/enwiki/Select
ion_of_a_circuit-breaker• Electric circuit (by: R.P. Ajwalia),Pub: Atul
Prakashan• http://www.electrical4u.com/electrical-power-tran
smission-system-and-network/• http://www.skm-eleksys.com/2011/03/transmissio
n-line-parameters.html• https://en.wikipedia.org
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