equipment against temperature build-up‚ caused by an unbalanced power supply‚ phase inversion or loss of phase‚ and against phase current unbalance ANSI 49RMS – THERMAL OVERLOAD Protection against thermal damage caused by overloads on machines (transformers‚ motors or generators). The thermal capacity used is calculated according to a mathematical model which takes into account: Current RMS values Ambient temperature Negative sequence current‚ a cause of motor rotor temperature rise RECLOSER
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Chapter 1 Introduction 1.1 Introduction: Wireless communication has announced its arrival on big stage and the world is going mobile. We want to control everything and without moving an inch. This remote control of appliances is possible through Embedded Systems. The use of “Embedded System in Communication” has given rise to many interesting applications that ensures comfort and safety to human life. The project mainly focuses on transmission of textual data through air interface by the use
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visits an herbal medicine store with his mom‚ sits in the waiting room‚ and begins talking with an old lady. This old lady asks Jin‚ what he wants to be when he grows up? To which Jin replied‚ that he wants to be a transformer‚ but his mom believes that it is silly for him to become a transformer. Then on page 29‚ the herbal medicine lady says‚ "It is easy to become anything you wish… So long as you’re willing to forfeit your soul." This
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potential 14.) In a circuit with 5 volts and 2 ampers ohms the voltage would be _______. A.) 10 15.) In a circuit with 12 volts and 5 ampers the restiance would be ________ ohms. A.) 2.4 16.) Soft iron used in the laminations of a coil or transformer has_____________. A.) a 17.) What happens when a coil of wire is passed through a magnetic field? A.) Magnetic field is cut by the wire and current will flow. 18.) What happens when electric current is passed through a coil or
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CHAPTER TWO 2.0. LITERATURE REVIEW In a commercial transaction system‚ a system user uses a card device to interact with sales or transaction terminals to conduct cashless transactions. Each terminal processes data including a balance stored on the card device and updates the stored data at the end of the transaction. The system is specially designed for purchases of items or transactions of relatively small monetary value‚ where purchases are generated unattended by salespersons. In this manner
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Remarks 1050kVp 680kV 520kV 610kV 630kV 460kV 460kV 530kV 460kV (Line-ground) (open terminals) Substation Bird’s view 400kV Circuit Breaker 400kV Isolator 400kV Current Transformer 400kV CVT 400kV Surge Arrester Shunt Reactor & NGR 400/220 kV Auto Transformer 400kV Bus Post Insulator Wave Trap Functions of substation equipments
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Question 2 a) Rotary Variable Differential Transformer (RVDT) Construction of RVDT RVDT is almost identical in the construction with LVDT. The ferrite core in LVDT is replaced by heart or cardioids shaped core. This rotational movement of the shaft creates the imbalance in the external circuit and this imbalance signal is used to measure the angular displacement of the shaft. RVDT give linear output up to displacement of +-40 degree. Then output starts becoming nonlinear. Operation of
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ELECTRICITY - A Secondary Energy Source A Secondary Source The Science of Electricity How Electricity is Generated/Made The Transformer - Moving Electricity Measuring Electricity energy calculator links page recent statistics A SECONDARY SOURCE Electricity is the flow of electrical power or charge. It is a secondary energy source which means that we get it from the conversion of other sources of energy‚ like coal‚ natural gas‚ oil‚ nuclear power and other natural sources‚ which are called primary
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Electrical installation handbook Volume 2 3rd edition Electrical devices 1SDC010001D0203 ABB SACE Electrical installation handbook Volume 2 Electrical devices 3nd edition June 2005 Index Introduction ............................................................................................................... 2 1 Standards 1.1 General aspects ............................................................................................. 3 1.2 IEC Standards for electrical
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DSE BASED ZONE PROTECTION: The dynamic state estimation based protection (also known as setting-less protection) has been inspired from the differential protection function and can be considered as an extension and generalization as illustrated in Figure 1. In current differential protection the electric currents at all terminals of a protection zone are measured and their weighted sum must be equal to zero (generalized Kirchhoff’s current law). Thus the current differential protection function consists
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