Chapter 1: Introduction 1.1 Background of study Induction Motors are widely used in industrial applications. It has been reported that they have a motor market share of approximately 80 percent. Their popularity stems from robust construction, low cost and ease of maintenance. As induction motors operate at a constant speed, they provide efficient operation in industrial applications if the loads that they drive remain fairly constant. However, the loads vary when the process conditions change during
electromagnetic geophysical methods have been used extensively and with great success to delineate conductive zones at depths. The aim of EM method responds to high conductivities rather than to contrasts in conductivity as is the case with the classical direct current (DC) method. This means that EM methods can detect small changes in conductivity in a conductive terrain by the correct selection of technique and array and secondly that resistive layers became transparent in contrast to the DC resistivity method
energy, providing good power output as well as being able to be charged and discharged rapidly without deterioration of any type. A typical power storage device can be characterized by its power density and its energy density, noting that with our current technology, none which can achieve the best of both. A relatively new technology, electrochemical double-layer capacitors or also known as supercapacitors, ultracapacitors
Ever since my days in middle school in China, I have dreamed of being an electrical engineer. My father nurtured my copious ideas such as transformer and inductor. Even though I didn’t have too much idea about electrical engineering, I found abundant happiness though work activities that included practical and hand-on problems. During the past three years, I learned a lot concept including semiconductor, electromagnetic and signal at University of Illinois. I have explored ECE widely and eventually
My life has been heavily freckled with a sense of adventure and research; a life that seeks to find the meaning of anything and will not stop till it gets to the depth of everything. This, perhaps, was responsible for damaging several electrical appliances when, as a boy, I was trying to discover what made everything that was not made in Nigeria work. It was this desire to discover things and break new grounds that spurred me into pursuing a career in the field I knew would best satisfy my curiosity
Photonic Semiconductor Abstract- Photonic semiconductor is deeply integrated in electronic circuit designs and widely used in many sorts of applications, they act as electrical to optical or optical to electrical transducers. This paper aims to discuss various optoelectronic devices; their structure, materials, theory of operation, merit properties and characteristics that recommends them for various applications. I. Introduction Optoelectronics is a branch of Photonics Science concerns with devices
Saeeid Tahmasbi Oskuii [et al.[1]] titled “Comparative study on low-power high-performance flip-flops” - factors to evaluate the overall performance of the flip flop viz., High speed, low power consumption, robustness and noise stability, small area and less number of transistors, supply voltage scalability, low glitch probability, large internal race immunity, insensitivity to clock edge, insensitivity to process variables, less internal activity when data activity is low.Latches and flip flops
that is that solar power cannot ever run out as long as it is installed properly. Solar power cells is a source of electrical energy that converts a powerful source of energy such as the sun into electricity, using it’s energy to create electrical currents within the solar panel. Solar panels produce electricity using technology called “Solar Photovoltaic (PV)”. Diagram of how solar panels generally work in a household. URL: http://www.energyfarm.com.au/why-solar-energy-perth/how-does-it-work-solar-power/
Voltage stability is defined as the ability of a system to restore steady voltages at all buses in the power system after being exposed by any disturbance from a given initial operating conditions. Voltage stability purely depends on the capability to maintain equilibrium between load supply and load demand from the consumer end. When there will be any progressive fall or rise of voltages of some buses that can cause instability. Power system stability is expressed by the capability of a power system
Analyse the need for selecting the different voltages used for different parts of the generation, transmission and distribution of electricity. Three Phase Systems Assignment 1 D1 Sean Smith JLR Electricity is the most used source of power in the modern world. We something that is connected too electricity practically all of the time in the modern era from mobile phones to the lighting in our homes. Thinking about where our electricity comes from is something that we never really think about but
interest developed in inventions and transformations. Technological innovations have led enormous changes in world and lifestyles. Recent developments in the world have changed the way of generating and using electrical power. I am satisfied with the current opportunities and with my profession. I am looking forward to work in a successful organization and play a significant role in taking it to higher rankings in the world. My interest started developing in the early stage of my life, when I studied
Control and Conversion of Electrical Power by Power Semiconductor Devices Power electronics refers to control and conversion of electrical power by power semiconductor devices wherein these devices operate as switches. Advent of silicon-controlled rectifiers, abbreviated as SCRs, led to the development of a new area of application called the power electronics. Prior to the introduction of SCRs, mercury-arc rectifiers were used for controlling electrical power, but such rectifier circuits were
solar cells are moved closer the light source the higher the power they will produce. As light moves away from the source it spreads out at all angles the further you are from the source the less intense the light will be. P = I V Power = current x volts P = FA Power = flux x area Flux = P/A Area of 4 solar cells that I will use is 0.0077m2 This means that the higher the flux the higher the power as we are not changing the area of the solar cells as this remains is constant
rectifier is an electrical device that can converts alternating current into direct current. The process is known as rectification. Rectifiers have many uses, but mostly used as components of DC power supplies and high-voltage direct current power transmission system. Because of the alternating nature of the input AC sine wave, the process of rectification alone produces a DC current that, though unidirectional, consists of pulses of current. Rectifiers have many applications such as power supplies for
inverter, is an electronic device or circuitry that changes direct current (DC) to alternating current (AC).[1] The function of an Inverter is to change the Dc input to a symmetrical AC voltage of desired magnitude and frequency. The output voltage could be fixed or variable at a fixed or variable frequency. A variable output can be obtained by varying the DC input voltage and maintaining the gain of the inverter constant.[2] Voltage and current waveforms produced by inverters are never perfect sinusoids
faulted region of the winding. Therefore, this generated heat will cause the fault to step rapidly to more critical forms, such as phase-to-phase and phase-to-ground faults [59] [60]. The internal short circuit currents of transformer may be larger than its terminal short circuit currents [61]. These faults will result in downtime and financial losses. There are many reasons that lead to internal winding faults such as [62]: a) Failure of winding due to short circuits (turn-turn faults and open
hits your roof's solar panels with photons (sunlight particles). These photons are converted by solar panel into electrons of direct current (DC) electricity. The electrons flow out of the solar panel into an inverter and other electrical safety devices. The function of an inverter is to convert the "DC" power (which commonly used in batteries) into an alternating current or "AC" power. AC is a kind of electrical power that computer, television and toasters use when plugged into wall outlet. The
windings . In any electric motor, operation is based on simple electromagnetism. A current-carrying conductor generates a magnetic field; when this is then placed in an external magnetic field, it will experience a force proportional to the current in the conductor, and to the strength of the external magnetic field. The internal configuration of a DC motor is designed to harness the magnetic interaction between a current-carrying conductor and an external magnetic field to generate rotational motion
desired output voltage or current and frequency. A static semiconductor inverter circuit does this electrical energy inverting transformation. The terms voltage-fed and current-fed are used in relation with the output from inverter circuits. Conventionally, inverters are classified into two broad categories – voltage source inverter (VSI) and current source inverter (CSI). A VSI is one in which the dc input voltage would have to keep constant and independent of the load current drawn. The inverter dictates
basic converter types (Pavelka and Čeřovský, 2002). Rectifiers convert an input AC voltage and current to an output DC voltage and current, choppers convert an input DC voltage and current to an output DC voltage and current of different values, inverters convert an input DC voltage and current to an output AC voltage, current, frequency and count of phases, AC converters convert an input voltage, current, count of phases and frequency to an AC energy with different parameters. The frequency converters