Abstract
In adjustable speed drive applications, the switching of the inverter semiconductors generates common
mode currents as well as harmful overvoltages on the motor terminals when long cables are used.
Consequently, bulky and expensive input and output filters must be used. This work aims at reducing
these disturbances from their origin by using a three-level neutral-point-clamped (NPC) inverter
controlled with a new pulse-width-modulation (PWM) strategy. Whereas previous common mode
noise-reducing strate ....etc

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Testing Numerical Transformer Differential Relays



INTRODUCTION

Commissioning versus Maintenance Testing
Types of Transformer Differential Protection:
Restrained Phase Differential
High Set Phase Differential
Ground Differential

Commissioning

Common Practice:
Test all numerical relay settings –
verify settings properly entered
Easily facilitated using computer –
automate test set & store results
Hundreds of tests are possible –
numerical relays have many s ....etc

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Am rema,want to know about an efficient common mode hybrid filter used in SMPS for my seminar work.


Abstract obtained from IEEE is After the study of electromagnetic interference (EMI)
mechanisms in switching mode power system (SMPS) and the soft
switch, this paper proposes a novel hybrid filter (HEF) to suppress
commend mode EMI in SMPS. The HEF consists of a passive filter
and an active filter. Matching network, which can reduce
impedance mismatching effects, is introduced in passive part. A
....etc

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i want coordinated master control project i.e.,boiler follow mode and turbine follow mode
i have doubt this project o help me ..........................
....etc

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th sem)Hai my name is Manu, i am studying B.E. (EEE , 8th sem). I know the concept of fuzzy logics, bt hoe to do it for FUZZY LOGIC BASED DIFFERENTIAL RELAY FOR POWER TRANSFORMER PROTECTION.? This i chosen as my B.E project. send me the details about this project.?


This is my mail id:[email protected]
....etc

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kindly furnished me with what this topic is about i.e steps to achieve the project up to P.hD level ....etc

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Linearly Variable Differential Transformer - LVDT


History


1831: Michael Faraday discovered current could be induced in a conductor by a magnetic field
U.S. Patent of G.B. Hoadley (1940)
First noted that the LVDT output amplitude varies linear with core displacement

....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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Common Base Amplifiers
Uses the same stabilised bias scheme as CE configuration.
Uses the same stabilised bias scheme as CE configuration.
The base is grounded for a.c. signals using a large capacitor.
Signal input at the emitter (between the emitter and the common base)
Signal output at the collector (between the collector and the common base)
....etc

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Am Nnachi Gideon a final year student of electrical engineering from University Of Nigeria (UNIZIK).
Am presenting a seminar on Differential Protection of Power transformer.
Am here in search of material for the said seminar topic achievement.
Please help me ....etc

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