Power Plant Guruji

  1.What deals power-system protection ? Ans. Power-system protection is a branch of electrical power engineering that deals  with the protection of electrical power systems. 2.A good electric power system should ensure that ? Ans. A good electric power system should ensure the availability of electrical power  without any interruption to every load connected to it. 3.Power protection systems limit ? Ans. Power protection systems limit the damage at the fault location and prevents  the effects of the fault spreading into the system. 4.What are the nature of faults ? Ans. The nature of fault simply implies any abnormal condition which causes a  reduction in the basic insulation strength between phase conductors, between  phase conductor and earth or any earth screen surrounding the conductors. 5.Voltage breakdown due to ? Ans. Voltage breakdown could be due to normal voltage or abnomal voltage. 6.Causes of faults could be due to ? Ans. Causes of faults could be due to pollution, ageing

  Circuit Breaker A circuit breaker is a switching device that interrupts the abnormal or fault current. It is a mechanical device that disturbs the flow of high magnitude (fault) current and in addition performs the function of a switch. The circuit breaker is mainly designed for closing or opening of an electrical circuit, thus protects the electrical system from damage. Tripping and Auxiliary Supplies Trip Circuit A relay provides a potential free contact, which is shown in the figure as Trip Contact', at the time of fault sensed by the relay. The auxiliary supply goes through this contact to the Trip Coil of the circuit breaker. circuit breaker trip circuit Auxiliary Supply All the circuit breakers are DC (Direct Current) operated. Because DC power can be stored in battery and at the time of total failure of incoming power Occurs, still the circuit breakers can be operated for restoring the situation by this battery. Hence, the battery is another essential item of the power sys