Infinite Bus Reactive Power Click Now To Get Solution

Question: Describe about the Infinite Bus for Reactive Power? Answer: Infinite Bus: An infinite bus means a large system whose voltage and frequency remains constant independent of the power exchange between the synchronous machine and the bus, and independent of the excitation of the synchronous machine. A synchronous machine (generating or motoring) while operating at constant power supplies positive reactive power into the bus bar (or draws negative reactive power from the bus bar) when overexcited. An under excited machine, on the other hand, feeds negative reactive power into the bus bar(or draws positive reactive power from the bus bar). The existing radial network is represented with four bus bars on a 100 MVA, 50 Hz base. The supply is represented as an infinite bus, nominal voltage 132 kV, a fault level of 2000 MVA and X: R ratio of 20 (bus B1/INF and generator Inf Bus), which under certain worst-case supply conditions may fall to a voltage of 0.98 pu. A single 132/66 kV transformer (T1) and 66 kV feeder line (L1) supplies the load on B4 at 33 kV via a 66/33 kV step down two winding transformer (T2) between B3 and B4. The design load on B4 is rated at 30 MVA at 0.8 pf lag. Generally, for a load with a power factor of less than 0.95 more reactive powers is required. For a load with a power factor value higher than 0.95 is considered good as the power is being consumed more effectively and a load with a power factor of 1.0 or unity is considered perfect and does not use any reactive power. Thus the existing network and plant are in need of review so that additional load can be supplied at B4 without allowing the voltage at the 33 kV busbar B4, to fall below 1.0 pu. Three reinforcement methods have been considered: A 25 MVAr capacitor, B4Comp, on B4 for reactive compensation or shunt compensation. A second 33 kV line, L2, identical to L1 between buses B2 and B3 Both the above methods to control B4voltage Shunt Compensation: Reactive power can be leading or lagging. While it is the active power that contributes to the energy consumed, or transmitted, reactive power does not contribute to the energy. Reactive power is an inherent part of the total power. Reactive power is either generated or consumed in almost every component of the system, generation, transmission, and distribution and eventually by the loads. The impedance of a branch of a circuit in an AC system consists of two components, resistance and reactance. Reactance can be either inductive or capacitive, which contribute to reactive power in the circuit. Most of the loads are inductive, and must be supplied with lagging reactive power. It is economical to supply this reactive power closer to the load in the distribution system. Reactive power compensation in power systems can be either shunt or series. Shunt capacitors are employed at substation level for the following reasons: Voltage regulation - The main reason that shunt capacitors are installed at substations is to control the voltage within required levels. As the load varies, voltage at the substation bus and at the load bus varies. Since the load power factor is always lagging, a shunt connected capacitor bank at the substation can raise voltage when the load is high. The shunt capacitor banks can be permanently connected to the bus (fixed capacitor bank) or can be switched as needed. Switching can be based on time, if load variation is predictable, or can be based on voltage, power factor, or line current. Reducing power losses- Compensating the load lagging power factor with the bus connected shunt capacitor bank improves the power factor and reduces current flow through the transmission lines, transformers, generators, etc. This will reduce power losses (I2R losses) in this equipment. Increased utilization of equipment- Shunt compensation with capacitor banks reduces kVA loading of lines, transformers, and generators, which means with compensation they can be used for delivering more power without overloading the equipment. Thus as per the values calculated after having 25MVAr capacitor and B4 compensator the values of load/B4 voltage magnitude and of B3 and B2 is .998 to 1.00pu, which is the desired and basic requirement of the sample radial network. Thus the voltage at B4/load is not falling below 1.0pu. Series Compensation: Series compensation is defined as insertion of reactive power elements into transmission lines and provides the following benefits: Reduces line voltage drops Limits load-dependent voltage drops Influences load flow in parallel transmission lines Increases transfer capability Reduces transmission angle Increases system stability Series compensation aims to directly control the overall series line impedance of the transmission line. The AC power transmission is primarily limited by the series reactive impedance of the transmission line. A series-connected can add a voltage in opposition to the transmission line voltage drop, therefore reducing the series line impedance. It is easy to see that capacitor reduces the effective line reactance. Reactive voltage drops of a series reactance added in a line is I2X. It is positive if X is inductive and negative if X is capacitive. So a series capacitive reactance reduces the reactance voltage drop of the line. Thus voltage drop in a line gets reduces (gets compensated) i.e. minimization of end voltage variation and prevents voltage collapse. Thus from the above outputs we can see that the voltage at B4 is maintained at 1.0 pu. So the adding of a same KV line in parallel to the existing line, also minimize the voltage drop in the line. When both the reinforcements are used simultaneously i.e. B4 compensator and a 33KV addition line the load voltage is .996 pu which is nearly to 1.0 pu. But the better results are shown when these reinforcements opted individually. The existing network additional load can be supplied at B4 without allowing the voltage at the 33 kV bus bar B4, to fall below 1.0 pu by implying any of the above methods.

Kaplan Universitys Online MBA Program Without GMAT Essay Example

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Georgetown University provides a nationally recognized graduate nursing program online and on campus at our student centered research  facility  with a global presence. Using highly interactive Web 2.0 technology, Georgetown engages our   faculty and  students in a personalized, seminar style learning environment that uses one on one interaction to promote fellowship and collaboration. The online coursework is combined with and carefully selected for clinical experience in close proximity to where our students reside, making this program and learning platform available to nursing professionals from across America. Click the Banner below for the Official: Georgetown University School of Nursing Online MBA Program no GMAT Vermont Law School  Online MBA Program no GMAT  is truly committed to making a very significant impact in the community and the world. 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Supply Chain Management Example

Supply Chain Management Example Supply Chain Management – Coursework Example Supply Chain Management (SCM) Supply Chain Management (SCM) Definition Supply chain management relates to interconnected businesses network management with the ultimate goal of providing services and products packages according to customers’ requirements (Cetinkaya et al., 2011). In essence, supply chain management entails all the fundamental process involved in storage and movement of raw materials, inventory work-in-processes, and finished goods from origin to consumption. SCM ensures that consumers get the appropriate quantity of products and services at the right time. Effective SCM focuses on forecasting, planning, assembly of products, purchasing, and storage. In addition, SCM entails distribution and sale of products and services to customers according to their preferences. It is imperative to note that SCM remains integral in the inherent success of a business within the market. An effectively planned system of supply chain management would ensure retention of loyal cu stomers through provision of standard products and services. Role of SCM in a company’s ability to compete effectively within the marketInvolvement of SCM principles in business process is fundamental to attainment of sustainable competitive advantage within the consumer market. SCM has the significant role of ensuring creation and delivery of affordable, convenient, and better products and services to consumers. For an organization to compete efficiently in the market, its SCM system must properly meet market demands through quality research and production of preferred products and services. In addition, the SCM system must commit itself to providing products and services at appropriate periods. Therefore, SCM has the fundamental role of establishing organizations’ logistics, product development, purchasing, and quality management. Moreover, SCM has to meet market pressures through establishment of competitive global procurement and sourcing, supplier relationship man agement, and inventory control. The inherent dynamism in market trends requires creativity and innovative skills of SCM professionals to enable a company compete effectively within the market. ReferenceCetinkaya, B., Cuthbertson, R., Ewer, G., Klaas-Wissing, T., Piotrowicz, W., & Tyssen, C. (2011). Sustainable Supply Chain Management: Practical Ideas for Moving Towards Best Practice. London: Springer Science & Business Media.

Easy To Make Glitter Slime

Easy To Make Glitter Slime Why make ordinary slime, when you can make sparkly glitter slime!  Try this easy recipe to make the slime in any color of the rainbow. Glitter Slime Materials glitter glueboraxwater The recipe works with either clear or white school glue, but white glue makes opaque slime. For clear or translucent colored slime that glitters, choose a clear or translucent glue. If you cant find glitter glue, add glitter as an ingredient. Borax is sold as a detergent booster with laundry supplies, or you can purchase it online. Let's Make Glitter Slime! Slime is a polymer that forms when you mix two solutions: glue and dissolved borax. The first step is to make these solutions. Dissolve 1 teaspoon borax in 1/2 cup warm water. Its okay if the borax doesnt completely dissolve. You only need the liquid part, not any solid that stays at the bottom of the cup.In a separate container, mix 1/2 cup glue (4-oz bottle of glue) and 1 cup of water. If you dont like the color of the slime, you can add a few drops of food coloring to the mixture.When you are ready to make glitter slime, dump the two mixtures into a bowl. Use your hands to mix the slime (thats part of the fun). If you have any leftover liquid after the slime polymerizes, you can discard it. When you are finished playing with the glitter slime, you can store it in a sealed plastic bag. The borax is a natural disinfectant, but the slime will keep fresh even longer if you refrigerate it. Clean-up is easy using warm water. Other Ways To Make Glitter Slime If you dont have the materials for this glitter slime recipe, you can add glitter to any  other slime recipes, or you can add glitter to slime from the store.

Journal Assignment Example | Topics and Well Written Essays - 500 words - 12

Journal - Assignment Example nducted by three institutions jointly, namely New Buildings Institute, Skanska-Sweden and International Living Future Institute is intended at acting as an eye opener to the District taking into consideration its findings and recommendations. Largely, the District’s official perceives the report as essential in the sense that it would greatly enable them to achieve their policy goals based on the study’s presented framework; thus, attain the slashing of the rate of energy used by the District to half of its 2010 consumption in 2032. Subsequently, the study’s report is targeted at enabling the District to obtain data that it can use to back up its green technology projects, starting with the reduction of energy use. According to Bill Updike, who is a specialist in green building in the District Department of the Environment, the District’s history in relation to the uptake of progressive policies in green building has been outstanding and with the new report, the District’s efforts will be aided further in the advancement of the building industry to curtail more invigorating and irrepressible structures. This takes into consideration the key findings of the study that are as described herein. First, the District can be able to make energy consumption savings in new developments it has by about 60% based on the added initial cost of construction by about 1 to 3 percent. Second, there is an increase in the percentage of energy’s efficiency return on investment from about 6% to 12%. This figure may be deemed to rise further to between 33% - 36% should the net-zero energy be modeled through the use of solar power. Third, the study suggests the adoption of advanced measures in the conservation of water with the aim of reducing the consumption of the same and the amount that is lost in storm water runoffs from buildings in the District by about 1% to 3%. Subsequently, the study seeks at enhancing a return on investment rate by 5% to 10% through a further

I will post it down 13 question to be answerd in 5 pages Essay

I will post it down 13 question to be answerd in 5 pages - Essay Example These views represent a mixed bag just as advocated for by Marshall and Smith. As such, values differ in range and manner depending on the user and the needs (Marron 94). 2. Likewise, how are wages and profits determined in your economic theory? By subsistence level like Malthus and are they mutually exclusive as they are for Ricardo? Or by social/historical determinants like Marx or by supply and demand in the market, like NC theorists? The market forces of demand and supply are what determine wages and profits in an economic theory. These forces determine the costs of operations within the industry, thereby setting costs such as the cost of living, the costs of operations in the company, as well as determine the level of efficiency and effectiveness in the company. As such, a company sets the wages according to market levels, since very low wages will dismiss good and experienced workers, whilst on the other hand, very high wages will drain the company’s profits. The main goal under these conditions is to keep the level of costs at controllable measures in order to maintain high profits. 3. What is your theory of human behavior? i.e., do you see humans as profit-maximizing individualists, or as community-minded workers who get great satisfaction from their work (like Veblen’s idea of â€Å"workmanship†) or something else? Human beings are profit-maximizing individualists who work hard to make them rich and comfortable. This is because most people think about satisfying their own needs and desires first before they look out for the welfare of others and of the community. For instance, an individual will go to school study hard to get the best grades, and then seek employment in the biggest corporation within his or her neighborhood. However, the first thing he or she will do with their paycheck is to buy a new car, or

Liver Transplant Essay Example for Free

Liver Transplant Essay Organ transplants are some of the hardest surgeries that doctors can do. They require many trained personnel, time, and complicated procedures. Liver transplants are among the most difficult organ transplants that can be done. There are also many risks involved with the surgery and patients must face all of them in order to come out with a new and working liver. According to the American Liver Foundation patients that undergo a liver transplant have a 75% chance of survival after five years. In other words, one in four patients will die in five years due to their new liver. Even for organ transplants, that is a very low chance of survival. Organ transplants tend to be very complex in nature. Since livers have so many functions they are among the hardest to transplant safely. The surgeon must first make a cut in the upper abdomen. Then they must remove the old liver by cutting it off from the blood vessels and bile ducts. The surgeon must then place the new liver into the patient’s body and connect it to the old blood vessels and bile ducts. Most operations usually take around 12 hours and since there is so much blood lost new blood must be continually added through a transfusion for the whole of the operation. There are many problems with this surgery and the first one is the act of moving the donated liver to the patient that will receive it. The liver can only stay functioning for a short period of time outside of the body. That means that as soon as a liver is taken from a donor it must be immediately transported to the recipient. This requires that many people work together as one to set up an appointment for the patient and the donor, to remove the liver from the donor, ship the donor’s liver to the recipient, put the liver into the recipient, close them up, and manage the finances of the whole operation. All of this requiring much time, effort, and money. There is yet an even larger risk that the new liver might be seen as an invader of the body by the immune system. This would mean that the body would start to break apart the new liver and attack it with cells that were made to fight off disease. The immune system would essentially be fighting off the thing trying to help it. Unfortunately all transplant patients also become dependent on immunosuppressive drugs that keeps the immune system from attacking the liver. While these drug may be helpful they also keep patients from fighting off infections, so all patients have a harder time fighting off disease. The patients must also use these drugs for as long as they live, adding up to thousands of dollars over the patient’s life. Luckily there are many new procedures that will make the chance of survival even higher. For instance, doctors can now take a small piece of a living donor’s liver and graft it onto the recipient’s liver. This can be done since the body only needs a small part of the a liver to carry out its normal functions, things like transporting the bile from the gallbladder to the intestines and detoxifying the blood. The procedure usually has to be done with donors and patients that have the same blood type and other major body factors. This means that a surgery is usually done with members of the same family. Another great thing for liver transplant patients is a new liquid that organs can be placed in for transportation. It keeps the organ as fresh as if it were inside the body. This allows the organ to be moved much farther than it would have otherwise. Instead of it being moved just 30 minutes away it can be moved across the country. But even this is not perfect, even in this liquid organs can still break down and fail to work inside of the new body. In the end, the benefits of liver transplantations far outweigh the risks for only one reason. Every patient will die if they do not receive a new liver.