The recent growth of power circuit capacities has caused fault currents to increase. Since the protection of power systems from the fault currents is very important, it is needed to develop a fault current limiter.

A fault current limiter is required to assure (1) rapid reaction to fault currents, (2) how impedance in normal operation and (3) large impedance during fault conditions. A super conducting fault current limiter (SCFCL) can meet these requirements superconductors, because of their sharp transition from zero resistance at normal cu ....etc

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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.

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Abstract
This paper presents an analytic current model for capacitively coupled Single-Electron Tunneling Transistors (SETTs) that is based on a modified M-state steady-state master equation. Based on this current model we also derive a current noise model for SETT. To validate the proposed models we calculate their characteristics at different device parameters and different operation temperatures and compare them with the corresponding characteristics calculated by the full master equation method. The results indicate that the propo ....etc

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¢ HTS Fault Current Limiters
By: Leanne Naidoo & Pranesh Sarjoodei
¢ Introduction
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Fault Current ,Circuit Breakers
¢ Fault currents are unanticipated power disturbances in the utility grid caused by lightning etc
¢ This causes circuit breakers to open and close. Circuit breaker will remain open in wait for repair crew.
¢ Until the power is restored, an outage occurs.
¢ In today™s electricity dependant economy, significant hardships and economic losses o ....etc

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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

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Definition

An accurate electric current transducer is a key component of any power system instrumentation. To measure currents power stations and substations conventionally employ inductive type current transformers with core and windings. For high voltage applications, porcelain insulators and oil-impregnated materials have to be used to produce insulation between the primary bus and the secondary windings. The insulation structure has to be designed carefully to avoid electric field stresses, which could eventually cause insulation breakdo ....etc

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

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Submitted by:
Amitabha Saha


cAnd Issues in PRACTICAL APPLICATION
IntroductionFault Current ,Circuit Breakers
Fault currents are unanticipated power disturbances in the utility grid caused by lightning etc
This causes circuit breakers to open and close. Circuit breaker will remain open in wait for repair crew.
Until the power is restored, an outage occurs.
In today’s electricity dependant economy, significant hardships and economic losses occur during the outages
What is a FCL?
When l ....etc

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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

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Superconducting fault-current limiters:New tools in the box for handling
high short-circuit power
Power grids of the future
An increasingly decentralised supply of
power, higher power flows and the present
backlog of investment in equipment will
require stronger adaptations to the power
network in the coming years. In this context,
high short-circuit currents play an essential
role. For example, in power networks short
circuits can arise due to lightning strikes or
failures of system components and of power
lines, resulting ....etc

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