Symmetrical and un-symmetrical fault

Symmetrical and nu-symmetrical fault in three phase overhead line, circuit breaker, balanced and unbalanced fault, Transient in RL series circuit.

1. Symmetrical & Unsymmetrical Fault In Three Phase Transmission Line Prepared By: Siddiqui Arshad hussain [email protected]

2. GOVERNMENT ENGINEERING COLLAGE DAHOD [email protected]

3. Contents Introduction Types of Fault Symmetrical Fault Unsymmetrical Fault Transient in RL series circuit Selection of C.B. Types of C.B. [email protected]

4. Introduction [email protected]

5. 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. [email protected]

6. Types of Fault Symmetrical fault LLL fault LLLG fault Unsymmetrical fault LG LL LLG [email protected]

7. LLL fault [email protected]

8. LLLG fault [email protected]

9. LG,LL,LLG fault [email protected]

10. Transient in RL series circuit [email protected]

11. [email protected]

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 [email protected]

13. Types of C.B. Oil Circuit breaker Air blast Circuit breaker Vacuum Circuit breaker Sf6 Circuit breaker [email protected]

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 [email protected]

15. [email protected]