This is a new technique for the protection of transmission systems by using the global positioning system (GPS) and fault generated transients. In this scheme the relay contains a fault transient detection system together with a communication unit, which is connected to the power line through the high voltage coupling capacitors of the CVT.

Relays are installed at each bus bar in a transmission network. These detect the fault generated high frequency voltage transient signals and record the time instant corresponding to when the initial ....etc

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Voltage surges are unpredictable, momentary increases in voltage. Typically, lightning, inductive switching, or power switching cause surges, which can damage the insulation in building wiring, electrical appliances, or electronic equipment.

Power surges, which can create havoc with today's highly sensitive electrical and electronic equipment, are an unavoidable fact of life. Power surges, both voltage and current, are occurring continually in today?s power systems.

Whether they occur naturally, such as from lightning and static electri ....etc

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satish das

CONTENTS

What is a bus bar?
Causes of fault
Suitable protection
Selection of CT ratios
Behaviour of protective CT (saturated CT)
Types of faults
Overcoming the faults
Stability Ratio
Conclusion
References

What is a bus bar?

Bus derived from Latin word
omnibus
(common for all)
Nerve centre of the power system

Causes of fault

Breakdown of insulation because of over voltages
Weakening of insulation because ....etc

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The Digital Transmission Content Protection (DTCP) defines a cryptographic protocol for protecting audio /video entertainment content from illegal copying, intercepting and tampering as it traverses high performance digital buses, such as the IEEE 1394 standard. DTCP ensures that the copy protection mechanism is built into Digital Audio/Video devices themselves (in addition to Traditional Encryption). This seminar will outline the basic principles of cryptography; and tells us about the cryptographic functions used in it. It will briefly look a ....etc

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DNSSEC : A Protocol towards securing

Abstract: Unlike spam, worms, viruses, and phishing”all of which confront end users directly” infrastructure attacks occur outside their normal frame of reference and control. But attacks on the Domain Name System (DNS), an engine of the Internet infrastructure, appear to be increasing in length and severity, affecting DNS information associated with financial services institutions, Internet service providers, and major corporations in the travel, health, technology, and media/ entertainment ....etc

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Lithium ion cells packaged in aluminium cans continue to be the highest performing cells in the market. Circuit protection for rechargeable lithium-based battery cells and packs in a critical design consideration.

overcurrent and overtemperature conduction that can result from accidental shorting or abusive/runaway charging can raise temperature high enough to damage components and cause substantial damage.

This paper presents the use of PPTC devices for short-circuit ....etc

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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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i need matlab circuit diagram for a new wavelet transform based busbar protection ....etc

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Respected Sir/ madam
I need the Ppt on the topic Synchronise alternator with infinite bus bar ....etc

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Introduction

A new simple, effective and inexpensive method for lightning protection of medium voltage overhead distribution line is using long flashover arresters (LFA). A new long flashover arrester model has been developed. It is designated as LFA-M. It offers great number of technical and economical advantages.

The important feature of this modular long flashover arrester (LFA-M) is that it can be applied for lightning protection of overhead distribution line against both induced overvoltages and direct lightning strokes. The induce ....etc

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