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

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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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Abstract
The current differential protection scheme isone of the most sensitive method for protection of transmissionlines. However, its sensitivity can be compromisedby distributed shunt capacitance of the line, presence of seriescapacitor, current transformer inaccuracies and communicationlatency as well as asymmetries in communication.This paper proposes a novel sensitive current differentialprotection scheme for transmission line protection. Ituses Global Positioning System (GPS) for time synchronizedmeasurements while fibre optic ....etc

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APPLICATION OF CURRENT DIFFERENTIAL PROTECTION TO TAPPED TRANSMISSION LINES
1. Introduction
Microprocessor-based current differential relays offer superior protection for power transmission lines. The key advantages over distance relays include better sensitivity for high resistance faults, 100% line protection, and better performance in the single-pole-tripping mode, particularly during evolving and cross-country faults. Besides the well-known requirements of high-speed communication and sampling synchronization, a microp ....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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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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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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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]
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ppt for industrial high voltage transformer protection against overheating of transformer using microcontroller
please help me ....etc

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