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Symmetrical and un-symmetrical fault
The document discusses symmetrical and unsymmetrical faults in three-phase transmission lines, including types of faults and their characteristics. It outlines the need for circuit breakers, their selection criteria, and types available. Additionally, it provides references for further reading on the topic.
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Symmetrical and un-symmetrical fault
- 1. Symmetrical & Unsymmetrical FaultIn Three Phase Transmission Line Prepared By: Siddiqui Arshad hussain hars10203@gmail.com
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- 3. Contents 1. Introduction 2. Typesof Fault 3. Symmetrical Fault 4. Unsymmetrical Fault 5. Transient in RL series circuit 6. Selection of C.B. 7. Types of C.B. hars10203@gmail.com
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- 5. • Under normalconditions, 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. hars10203@gmail.com
- 6. Types of Fault 1.Symmetrical fault 1. LLL fault 2. LLLG fault 2. Unsymmetrical fault 1. LG 2. LL 3. LLG hars10203@gmail.com
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- 10. Transient in RLseries circuit hars10203@gmail.com
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- 12. Selection of C.B. •Voltage Rating • Frequency • Maximum interrupting capacity • Continues current rating • Types of operating mechanism used • Operating condition • Maintenance and testing • Cost hars10203@gmail.com
- 13. Types of C.B. •Oil Circuit breaker • Air blast Circuit breaker • Vacuum Circuit breaker • Sf6 Circuit breaker hars10203@gmail.com
- 14. Reference • http://www.electrical- installation.org/enwiki/Selection_of_a_circuit- breaker • http://www.electrical- installation.org/enwiki/Selection_of_a_circuit- breaker •Electric circuit (by: R.P. Ajwalia),Pub: Atul Prakashan • http://www.electrical4u.com/electrical-power- transmission-system-and-network/ • http://www.skm-eleksys.com/2011/03/transmission- line-parameters.html • https://en.wikipedia.org hars10203@gmail.com