This article describes the Voltage swell and overvoltage compensation problems in a diode-bridge rectifier supported transformerless-coupled
dynamic voltage restorer (DVR). applying conventional in-phase or phase-invariant boosting method in case of condition of swell or overvoltage, may cause a a rapid rise in dc-link voltage which may ultimately lead to the damage of the storage capacitors and switching devices, and increase the switching loss. The minimum energy injection scheme is unable to solve these problems. Here, a novel unidirectio ....etc

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sir/madam can u please help me in simulink model of voltage sag ....etc

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i would like to see these ppt to analyze my documet ....etc

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ZIGBEE and GSM-SMS Based Conductor Temperature and Sag Monitoring
Presented By
ANEESH P
Roll No. 203
Electrical and electronics engg.
College of engineering, Trivandrum


contents

Introduction
Study on Relative Models
Preambles of Conductor Capacity Ratings
Dynamic Thermal Line Ratings (DTLR)
Traditional Methods for DTLR
The Structure of the Monitoring System
The Topology of System
Structure and Design of Monitoring Unit
The structure of temperature monitoring device
The structure of tem ....etc

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Abstract
This paper deals with the design, construction, instrumentation and testing of a GSM and ZIGBEE based monitoring system for the measurement of Overhead High Voltage (HV) Conductor Temperature and Sag. The main advantage of this concept is the real time direct measurement of the parameters (i.e., conductor sag and temperature) needed for the operation of the transmission system without intermediate measurement of conductor tension and ambient weather conditions, by which the temperature controlling of transmission lines conductors is ....etc

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Application System Modeling Data Modeling through ER Model
Context Level Diagram
Data Flow Diagram
1. It is a graphical tool for designing systems ,input ,process and output.
2. It represents flow of data through system.
3. It shows the processes ,data stores ,sources & destination entities .
4. The transformation of data from input to output through process is described logically.
5. The top level diagram is called context diagram. It contains single process .It gives a broad overview of the system under ....etc

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EFFECTS OF VOLTAGE SAGS, SWELL AND OTHER DISTURBANCES ON
ELECTRICAL EQUIPMENT AND THEIR ECONOMIC IMPLICATIONS



ABSTRACT

Poor power quality has come to stay in most parts of the
world. In most part of Africa, especially in Nigeria, it is
almost normal not to have good clean power free from
disturbances. If power equipment and loads could talk or
express feelings, I am sure they would have made a big
protest against the great injustices imposed on them. A
survey was carried out amongst 15 multi-nation ....etc

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voltage, usually caused by a fault in A voltage sag is a momentary decrease in the rms the utility transmission line or distribution system within customer facility.

It is a temporary voltage drop below 90% of the nominal voltage level. Voltage sags and momentary power interruptions are probably the most important power quality problems affecting industrial and large commercial customers.

This paper describes the causes of voltage sags, their impacts on equipment operations and possible solutions. This paper focuses on system faults ....etc

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Sag and stress on transmission line analysis. ....etc

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ppt file of overhead transmission line sag ....etc

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