Prepared by:
SHRIDHAR DAVE


Residual current circuit breaker
HISTORY
 World’s first protective system is developed in South Africa by Henri Rubin.
 High sensitive earth leakage protective system
 Name of that was MAGAMP.
 It was second harmonic magnetic amplifier core balance system.
 Operated at 525 V and 250 mA.
INTRODUCTION
 RCCB is the circuit breaker that senses the fault current and trips when there is a difference between amount of current in line and neutral.
 obje ....etc

[:=Read Full Message Here=:]

hi sir
i want to give seminar on rccb i choose this topic i donot get proper seminar report on this topic please help a humble request to you sir ....etc

[:=Read Full Message Here=:]

INTROUCTION



ESSENTIAL QUALITIES OF HV CIRCUIT BREAKER

High-voltage circuit breaker play an important role in transmission and distribution systems. They must clear faults and isolate faulted sections rapidly and reliably. In-short they must possess the following qualities.

In closed position they are good conductors.
In open position they are excellent insulators.
They can close a shorted circuit quickly and safely without unacceptable contact erosion.
They can interrupt a rated short-circuit current or lower current qui ....etc

[:=Read Full Message Here=:]

Hello,
I want information about topic digital testing of high voltage circuit breaker. Please give me information about this topic. I will be very thankful to you. ....etc

[:=Read Full Message Here=:]

1. Abstract
The second harmonic inrush restraint function of transformerdifferential relays maintains security of the differential protectionduring transformer inrush events. The typical setpoint for thesecond harmonic restraint is the relay manufacturer’s defaultor recommended setting of 20% of fundamental current, withsome adjustment based on operating experience. However,some operating situations may result in levels of secondharmonic current lower than 20% during inrush, and levels maybe as low as 5%. This lower level of second h ....etc

[:=Read Full Message Here=:]

plz send me pdf file for above subject ....etc

[:=Read Full Message Here=:]

hello,i m ASAD ali from i m electrical engineering final year student and i m intrusted in transformer so i want to go for some good project about trasnformer
so please send me information about measurement of inrush current in transformer and how can i use it for the protection of distribution transformer by designing some relay or some thing else please give me good idea and tell me how i should start my project i hope i ll get good and very usefull guide line from you sir.

....etc

[:=Read Full Message Here=:]

i need the basic ckt daigram of the prjct so that it can b easily implemented practically......also the theoritical knowledge of the project... ....etc

[:=Read Full Message Here=:]

INTROUCTION to Digital Testing of High Voltage Circuit Breaker

With the advancement of power system, the lines and other equipment operate at very high voltages and carry large currents. High-voltage circuit breakers play an important role in transmission and distribution systems. A circuit breaker can make or break a circuit, either manually or automatically under all conditions viz. no-load, full-load and short-circuit conditions. The American National Standard Institute (ANSI) defines circuit breaker as: A mechanical switching device cap ....etc

[:=Read Full Message Here=:]

pls send me ppt on digital testing of high voltage circuit breaker ....etc

[:=Read Full Message Here=:]