Tuesday, October 8, 2019
Dream job Essay Example | Topics and Well Written Essays - 1000 words
Dream job - Essay Example I therefore, must admit how privileged I am to have passion for something. This is electrical engineering. I love everything about electrical engineering, and I believe that my future in electrical engineering is promising. I am driven by passion in my studies, and I believe my love for electrical engineering will continue to benefit me in many different ways, now and in future (Anderson 33). I remember my childhood period when I grew up as a curious child, wanting to know everything I had no idea of. I would watch my father repair electronics, including light bulbs, and I would get interested in knowing why the appliances had stopped working, and how they were fixed. I am thankful that my father was patient with the stubborn me, and always took delight in offering me detailed explanations of how he had fixed the appliances. This was instrumental, as almost every day; I would learn a new thing. I grew up with this curiosity and inquisitiveness, and I am glad this helped me get a lot of information about new things and concepts. When I was of considerable age, I learnt that my passion for electrical engineering was real. I remember telling my parents one evening that I would study electrical engineering when I grow up. My father did not object, he patted me on the back and affirmed that that was my thing. From that moment, I became focused on electrical engineering. ... he world, and that each day I will be looking forward to learning something new, increases the urge in me to know more, to comprehend an extra concept, and excel in electrical engineering. Therefore, my hard work, dedication, and passion for this course will ultimately take the world and me to the engineering standards that we aspire in future. All study courses are important in the world today. However, I believe that electrical engineering plays a special role and holds a special place in the global economy today. This is why I admire the prominent dedicated electrical engineers in this country. I have always stopped to think and imagine how the world would be, if electrical engineers never existed, or if they suddenly gave up their roles. Afterwards, I figure out that if all electrical engineers were to vanish from the world one day, many of the things people depend on would become non-existent or would suddenly stop working. This has always given me the pride to be an electrical engineer in the making. Thus, I am a motivated person, knowing that I am on the right track to my profession, and to a fulfilling future. Electrical engineering is responsible for shaping talented individuals to become successful electrical engineers. The electrical engineers hold a special place in society today. For instance, these influence the work of mechanics and electricians, by ensuring everything, including things such as circuits, is in place, before the mechanics and electricians start working gadgets, vehicles, among other electrical appliances. In addition, many homes, offices, malls, hospitals, schools, among others need an electrical engineer to ensure that everything runs as intended. Electrical engineers generally provide important services in society, which ensure that all
Monday, October 7, 2019
The circulation Coursework Example | Topics and Well Written Essays - 250 words
The circulation - Coursework Example The aorta is separated from the aorta by the aortic semilunar valve that allows blood to only flow from the ventricles and not back. Many arteries then branch from the aorta to circulate rich oxygenated blood to all parts of the body. This pathway of blood through blood vessels, body parts, and body organs except the lungs is referred to as systemic circulation. Systemic circulation is responsible for carrying blood to the neck, head, and other organs in the body. It exchanges oxygen in it with carbon dioxide from the body tissues. Blood then flows via atria system and then to the capillaries. Blood flows in a series of veins and eventually flows to the right side of the heart. Two large veins; superior vena cava (drains the upper surface) and inferior vena cava (drains the lower body) collect blood from systemic circulation and dump the deoxygenated blood to the right atrium (Zamir 2006). Blood then passes through the right atrium to the right ventricle through tricuspid valve then out of the right contracting ventricle via pulmonary semilunar valve to a pulmonary artery. The pulmonary artery branches into arteries that carry blood with deficient oxygen to the lungs. Blood with plenty oxygen and reduced carbon dioxide then returns to the left atrium of the heart repeating the
Saturday, October 5, 2019
Business law assignment Example | Topics and Well Written Essays - 750 words
Business law - Assignment Example ties can consider various alternatives without arriving at the final agreement while litigation is contentious and costly and getting back to courts will require a change of circumstances of the case. Mediation is cheaper since the parties hire a neutral mediation expert as opposed to litigation which entails two opposing attorneys and numerous court proceedings. An indictable offence is an offence that can only be tried on an indictment after preliminary hearing to determine whether the accused has a prima facie case to answer. They are the most serious offences under the criminal code and carry serious punishments such as life in correctional centres. Some facts of indictable offences include the lack of limitation on when charges can be laid with exception of treason where the limitation for trial is three years. The trials are held in Provincial courts. The police can arrest a person without a warrant of arrest. The convicted persons can only apply for pardon after ten years since conviction. Examples of such offences in Canada include murder, treason, and aggravated sexual assault (Baudouin and Linden 45). Section s16 (2) of the Act outlines the official languages and provides equality of the two languages since New Brunswick is dominated by English speaking and French speaking citizens. In this case, the government institutions and legislative organs must use the two languages. Section 28 of the Act safeguards gender equality by outlining that both males and females are guaranteed equal rights and freedoms. The section is important since it prohibits discrimination on the basis of gender. c) The plaintiff claimed both general and special damages. General damages are not assessed directly and include non-monetary losses suffered from the injuries. In this case, general damages include depression, loss of future income due to injuries, pain, disfigurement and loss of lifestyle. The special damages are directly linked to the injuries and quantifiable in
Friday, October 4, 2019
Public Relation(Marketing) Essay Example | Topics and Well Written Essays - 1000 words
Public Relation(Marketing) - Essay Example The ever diminishing turn-out in elections for the European Parliament - it fell in all but three member-states during the recent Euro elections - is just one eloquent expression of popular disaffection and indifference towards the EU" (Clegg, 2003, p.5). The focus of the present essay is the perception of British citizens of 50 of European Union and related institutions. The nationwide EU research, conducted in summer 2006, comprised 1,347 persons of British citizenship, 45% of whom were people over 50 (Eurobarometer 65). As the report holds, the British are known for their typical answers 'I don't care' and 'I don't know', but citizens over 50 have specific position. For instance, when asked about their opinion concerning the EU membership, 50 per cent of respondents answered 'It is a good idea', 16 per cent found it unacceptable, whereas there were 34 per cent, who were just unaware of current political issues. As for seniors, the huge percentage of people over 50 (30 per cent) view EU membership as problem and don't support it, and only 23 per cent found the idea sound and reasonable. Still, there are 47% of indifferent (or poorly-informed) citizens, the majority of who are aged over 65 and who are currently not able of following all news broadcasts. Nevertheless, the survey suggests that the situation has improved comparing to 46-per-cent unawareness in summer 2005 (Eurobarometer 63). On the other hand, the related dynamics among seniors is slower - whereas in 2005, the percentage of indifferent or unaware citizens aged over 50 was 49%, the recent research shows only 2-per cent decrease. This fact is clear and explainable: the survey was participated by various age groups and social classes - from students to businesspeople, and the natural increase of education level is exactly what the investigation has measured. On the other hand, citizens over 50 are less motivated in terms of political inquiries, so they are likely to remain either uninformed or uninterested. The exact percentage of uninformed citizens is 12 per cent: "What is also encouraging to note is that only 125 of the UK poll say that they know nothing at all about the European Union compared with 18 per cent a year ago. There is a welcome decline in the negative aspect of the UK data. A year ago, 28% of UK citizens said they never looked for information on the EU. It has now reduced slightly, but significantly, to 23%" (Eurobarometer 65, p.3). On the other hand, White et al highlights that this positive step forward is being done by the population under 45, whereas the development of consciousness in citizens over 50 has been in state of stagnation for five years. For instance, only 8 per cent of British seniors made attempts to find more extensive information about the EU (White, 2006), and their number has enjoyed only 1,5 per cent increase over the last year. Earlier research (Lafferty, 2004) introduces certain target audience for cognitive influence, and categorized the UK population by age and gender. Female students from 23 to 28 turned out the most perceptive and sensitive in terms of recent information campaigns, run by the EU. People over 50 are considered neither influential (i.e. they are not able and not motivated to persuade their surroundings) not sensitive to new information. Lafferty indicates that the typical profile of a UK citizen over 50 is following: a person interested in domestic news and concerned about governmental
Thursday, October 3, 2019
Psychological Testing Article Analysis Essay Example for Free
Psychological Testing Article Analysis Essay Psychological testing is a tool to properly assess behaviors and characteristics of individuals. Results of psychological testing are often presented through statistical tables that allow evaluation and comparison of the different variables tested against set norms. This paper will review an article lifted from the Health Psychology journal and determine the appropriateness of the psychological testing instruments used in the study. For this purpose, the article chosen is ââ¬Å"Evolution of Biopsychosocial Model: Prospects and Challenges for Health Psychologyâ⬠written by Jerry Suls and Alex Rothman in 2004. Article Summary The Biopsychosocial Model has enabled health psychologists in the search for a multi-level, multi-system approach to human functioning (Suls Rothman, 2004). This idea is based on the premise that there is an intrinsic relationship between what is physical, psychological and social. However according to the research of Suls and Rothman, there are marked challenges that the model faces that have essentially impeded the progress of its full potential as a research, intervention and practice tool. The articleââ¬â¢s ultimate goal was to determine what can be done to ensure the continuous refinement and evolution of the biopsychosocial model (Suls Rothman, 2004). As a means to determine the viability of the biopsychosocial model as a multi-faceted instrument to help explain an individualââ¬â¢s health psychology, Suls and Rothman resorted to the use of statistical tests in psychology. By conducting frequency tests and factor analysis, the team of Suls and Rothman came up with a list of recommendations in the modelââ¬â¢s areas of research, training, policy and funding, and practice. These recommendations are to further utilization of the links between biological, psychological, social, and even macro-cultural variables, with the ultimate aim of enhancing health (2004). Through the tests five issues were also identified to be crucial in the progress of the biopsychosocial model as a legitimate approach to health assessment. The article concluded by highlighting the various advancements in health psychology, particularly with the biopsychosocial model. However, Suls and Rothman stressed that the full potential of the model in terms of the ability to advance the theory and practice remain untapped (2004). Only a strong commitment to the model and it implications would establish long-term success of its involvement in health psychology (Suls Rothman, 2004). Psychological Testing Instruments Used The article of Suls and Rothman did not explicitly discuss the test they used to assess the biopsychosocial model. In spite of this, it can be deduced from the tables they presented and the discussion of their findings that they relied on statistical tests in psychology in data-gathering. Statistical tests are commonly used to analyze results of a psychological research (Green Dââ¬â¢Oliveria, 1982). In fact many social sciences, particularly psychology, necessitate the use of statistical inference to explain findings (Meehl, 1967). In this particular article where the bulk of the fact-finding are based on peer research, two statistical tests in psychology were used. Suls and Rothman conducted frequency tests two times in their research study. Frequency tests are the most helpful tool when comparing data against each other (Lane, 2004). Through frequency tests, marked differences in independent variables are clearly distinguished. To measure the progression of the biopsychosocial model as a accepted concept in health psychology, Suls and Rothman conducted a frequency test on the use of the term ââ¬Å"biopsychosocialâ⬠in journals and articles of Medline from 1974 to 2001, totals of which were group into a 3-year period interval (2004). Suls and Rothman likewise applied a frequency test to measure the integration of behavioral approaches to medical science in the study (2004). They reviewed articles in 4 major medical journals namely New England Journal of Medicine, Lancet, Journal of the American Medical Association, and the Annals of Internal Medicine between the years of 1974 and 2001 (Suls and Rothman, 2004). Once again, they grouped the results into 3-year period intervals. From the raw frequency scores collected, they were able to produce a frequency polygon. A frequency polygon is the best way to present data gathered from frequency tests because it shows the shape of distribution of measured variables (Lane, 2004). Apart from frequency tests, Suls and Rothman also used factor analysis test. Factor analysis is one of the most commonly used statistical tests in various disciplines. It is used to determine patterns of relationships between variables (Gorsuch, 1983). In the area of psychology, factor analysis is commonly applied in intelligence research but it can also be used in other areas, like personality, behavior, belief, and even theory assessment. In this instance, factor analysis was used to assess the attitude of health psychologists towards the biopsychosocial model. The biopsychosocial model is dependent on the interaction between the biological, psychological, and social factors within an individual (Suls and Rothman, 2004). Suls and Rothman theorized that health psychologists are more likely to focus heavily on the psychological factor alone in the biopsychosocial model (2004). Therefore they used factor analysis to measure the presence of all the factors in articles written within a 12-month period, November 2001-September 2002 in Health Psychology. This particular application is called confirmatory factor analysis. It is used when the concern is to determine the number of variables that conform to a pre-determined theory set (Gorsuch, 1983). The value of this test is to assess the validity of preconceived ideas. In the case of Suls and Rothmanââ¬â¢s study, it is the leaning of health psychologists towards psychological factors to assess an individualââ¬â¢s health. The article of Suls and Rothman did not make use of any standardized psychological testing instruments. The reason may be due to the fact that it is a study aimed at determining the advancement of a framework of health assessment. However, they still integrated valuable statistical testing in psychology to explain clearly the findings they have gathered. Effectiveness of the Psychological Testing Instruments Used The main premise of Suls and Rothmanââ¬â¢s article is that the biopsychosocial model has proven remarkably successful in shaping the way health psychologists view an individualââ¬â¢s overall functioning (Suls and Rothman, 2004). To prove this point, the team proceeded to measure the familiarity of the concept among health psychologists by reviewing published journals in Medline, and four other notable medical journals. The raw data collected was then subjected to different statistical tests commonly applied in the field of psychology. From there Suls and Rothman were able to formulate recommendations vital to the advancement of the biopsychosocial model as a valid instrument in health assessment. The effectiveness of psychological testing is based mainly on two factors, validity and reliability. Validity measures the soundness of a test against its set objectives. On the other hand reliability measures the accuracy of the test in terms of producing consistent results. To determine whether the result of psychological testing is effective, researchers usually turn to statistical tests. In this case where no standardized psychological testing instruments were used, the effectiveness of the study may be directly correlated with the quality of the results produced by the statistical tests used by Suls and Rothman. Suls and Rothman resorted to frequency test to explain their findings on the use of ââ¬Å"biopsychosocialâ⬠as a term in medical journals. The test confirmed their initial assumption that the biopsychosocial model has helped in advancing health psychology in the last 25 years. The frequency test showed a consistent rise in the use of ââ¬Å"biopsychosocialâ⬠as a term in medical journals. However, Suls and Rothman are quick to stress that this may also be due to the increase of the number of articles published that deal with behavior in recent years (2004). They also used frequency test to assess the integration of behavioral approach to medical science (Suls Rothman, 2004). The results attested as well to the increased integration of behavioral approaches to medical science in the last 30 years (Suls Rothman, 2004). Finally a factor analysis test was conducted to determine the reliance of health psychologists on the variables essential to the biopsychosocial model. The factor analysis test clearly showed that health psychologists are still biased in considering psychological issues over biological, and even social. This correctly proved the initial postulation of Suls and Rothman. Considering that the statistical tests in psychology used in the research of Suls and Rothman ably supported their theory, it can be said that they were effective. However, since the study is mostly a review of journals it is not enough to completely determine the actual advancement of the biopsychosocial model as a tool for health assessment. George Schwartz in his book suggested that the biopsychosocial model faces a challenge with the use of empirical testing (1982). Empirical testing is a vital component to any psychological research. Another is that the model remains a concept in research. It has yet to transcend from research to practice, then back to research (Keefe, Buffington, Studts Rumble, 2002). This is when the recommendations of Suls and Rothman become important. They were able to identify important areas that are tangible and measurable that will help in the transition of the model from a mere conceptual framework to a fully working tool in health assessment. As a stand-alone article, Suls and Rothman presented a thorough exposition of their chosen subject. However, based on the criteria of the article review, it did not meet the standards required. The fundamental component needed in the review is psychological testing in which the article did not have. On the other hand, the statistical tests were very helpful in understanding the basis of Sulsââ¬â¢ and Rothmanââ¬â¢s conclusion. Considering the statistical tests were properly chosen and used, it can be concluded that in the end the article of Suls and Rothman was a success. References Gorsuch, R. (1983). Factor analysis. Hillsdale, NJ: Erlbaum Green, J. Dââ¬â¢Oliveria, M. (1982). Learning to use statistical tests in psychology 3rd edition. NY: Open University. Keefe, F. , Buffington, A. , Studts, J. , Rumble, M. (2002). Behavioral medicine: 2002 and beyond. Journal of Consulting and Clinical Psychology, 70, 852-856. Lane, D. (2004, Augus 10). Frequency polygons. Connections. Retrieved August 25, 2010,
The Importance Of Data Collection
The Importance Of Data Collection In this chapter, data collection will be carrying out to meet its aim and objectives. Data collection is a way to describe a process of preparing and collection data. Furthermore data collection can defined as an important aspect of any type of research study. Any inaccurate data collection may lead to invalid result and affect result of study. In other word, this chapter will review method applies in data collection that determine the level of knowledge of the all site workers awareness to hazardous work and safety and health training. A research study can gain information with two sources which are primary sources and secondary sources. The information that obtains by internet, book, journals and magazines are secondary sources. However interview and questionnaire are classify as primary sources which these two method can obtains information and get a real picture of the study. There are three methods can be carried out to collect data. These three methods can define as case study, interview and questionnaire. In this chapter, researcher decides to use interview to collect data. To make the research more clearly and fully interpreted for achieving three objectives. Researcher will discuss rationale of the research interview and revise the statement of the research aim. In this chapter, researcher will be explaining the way of conducting the interview questionnaire. However, rationale of the questionnaire design will be included in this research which to enable interviewees understand the questions that stated in questionnaire. Last parts of this chapter will be determining the method of analysis that selected to evaluate and analysis the data. 3.1 Data Collection Technique After review to method of data collection, the method to be use in collecting data is qualitative data collection method. The reason of select qualitative data collection method; it is because qualitative data collection method is more suitable in this research study. 3.2 Interview Interview can defined as a conversation between two or more people, purpose of interviewer questioning is to obtain information from the interviewee. Beside that, interview can be flexible or inflexible which it is depending on the freedom of formulate the questions and issue being investigated. According to Dr S. G. Naoum, the interview can be classified in two forms which are structure interview and unstructured interview as Fig 3.1 Flexible interview structure Flexible interview contents Flexibility in interview questions Rigid interview structure Rigid interview contents Rigidity in interview questions and their wording 3.2.1 Advantages of Interview Interview is more applicable and useful for a complex situations compare to the other method. If interviewee encountered difficulty in answering questions or unable to understand the questions, the interviewer can direct clarify doubt to interviewee and ensure the interviewee is properly understood. In this case interview can obtain a higher understanding. Furthermore, interview will help in collecting depth data and information. The researcher can gain more detailed and accurate data through probe deep in interview situation. Face to face interview can produce a higher response rate which interviewee provides the answer through communication as interviewee may not require reading and writing the answer. Beside that, interviewing has a wider application, especially suitable for those who are week and lacks reading skills. 3.2.2Disadvantages of Interview Interview is more time-consuming and expensive compare to other method of research. Interview will spend a lot of time and may not be cost efficient if particular of research have number of tasks to study. On the other hand, the quality of data is depending on the ability of the interviewer. Quality of data collected might affected by experience and skill of communication of the interviewer. Interviewee may provide inaccurate information if interviewer being faulty in ambiguous questions to interviewee. Furthermore the other disadvantage is interviewer bias in leading. Leading is the way that interviewer guide the interviewee in answering the questions. Verbally may affect the leading by the actual word used, other than that non-verbally which is body language might effected the leading during the interview. Any faulty of leading will cause inaccurate data collected. In additional, quality of interaction might affect the quality of data collected. The interaction between interviewer and interviewee might vary from different interview, in the result the quality of data collected may dramatically lower and lack of credibility. 3.3 Statement of Research Aim In this research will carried out based on one aim and three objectives. To make the research more credibility, one aim and three objectives will apply in design of the interview and conduct the questionnaire. The aim of this study is to determine roles of safety officer to implement safety training programs, in order to create a safe workplace. In achieving this aim, there objectives stated as following: To highlight the hazard and accidents that most commonly found at construction sites, To identify the scopes and characteristics of safety officer to create a safe workplace To determine effectiveness safety training programs for site workers in Malaysia construction sites. These three objectives are generated, after the researcher critically reviews the book, articles and journal. Three objectives might apply in interview through face to face interview to local construction site personnel. 3.4 Rationale of Questionnaire Design This dissertation title is à ¢Ã¢â ¬Ã
âSafety Plan in Construction Site: Safety Officer Perspectiveà ¢Ã¢â ¬Ã . Safety and Health Officer is playing a very important in create a safe workplace. The accident occurs in construction site are usually affect the objective of the project. Questionnaire design may touch on background and organization of interviewee. Questionnaire will identify causes and effect of accident occurs in construction site. The interviewees are request to elaborate the hazard and risk in construction site which to achieve the first objective set out by researcher. Furthermore, roles of Safety and Health Officer will be included in the questionnaire, it is to understand task and job done by Safety and Health Officer which related to the second objective of this dissertation. Other than that, questionnaire might investigate the process of hazard assessment. The third objective will achieved that the questionnaire will determine the training element which ca rry out by Safety and Health Officer. The interviewee is requiring to explain the contents of the safety training. 3.5 Research Sample The interviewees were selected based on certain characteristics required to meet the research objective. In this chapter, the site personnel with experience in safety and health issue and training will be selected. In this case, with experience and knowledge of the interviewee, the data collected from them will become more credibility and accurate. Furthermore, project manager, site supervisor and safety and health officer will be the target population for this study. This survey target on different construction position level of interviewees, it is because every position of work may have their own opinion and knowledge in safety and health issues. The sampling area will focus in peninsular Malaysia and Sabah construction sites. It is more easier to gather the accurate information and answer. 3.6 Method of Analysis In this element, the analysis will do based on data that collected from the interviewees. The method of analysis used is trend approach that require to analysis the interactions provided by interviewees. In the analysis part, researcher will describe the out come of interview with ten site personnel in a conversation from. Every question will provided with three answers that collected from the selected interviewees. In the other hand a discussion will be included to analyze and compare the information obtained from the interviewees. 3.7 Reason of choose interview In this research, interview will carry out to gather data and information. By using this matter, data collected from interviewees will more accurate compare to other matter. If used questionnaire method, the respondents may simply answer the questions, due to respondent might not understand the questions asked. But used interview method, if interviewees not understand the questions asked, the interviewer can explain to them. In the other hand, if interviewees understand the questions asked, the answer provided by them will become credibility. 3.7 Potential Problem and Contingency plan Quality of data collected The problem might encountered during the interview are the quality of information and data that collected from the different interviewees. All interviewees are from different background, furthermore they have different experience and opinion in safety and health issues, so the data that obtained by them may vary. To over come this problem, interviewer might select the interviewees who have number of years experience in construction firm. Beside that, interviewer may interview the site personnel who currently on position project manager or site supervisor or safety and health officer. Low respond rate During the interview, the interviewer may encountered hard to make appointment with the interviewees, because not many people are willing to interview. In interviewees opinion, interview are not part of job for them, the interviewees might think spend time to accept interview and answer the questionnaire is wasting time. Therefore, the interviewer have responsibility to minimize the problem that ensure have enough people to accept interview. The method can be use to solve this problem is interviewer should list out the company to be interview. Companies selected for this interview should more than 20 companies to avoid some of the people refuse to accept interview. 3.8 Rationale of Questions The below questions were designed based on Objective 1. Question 1: Do you think apply Personal Protective Equipment can reduce the number of accident? Why? This question is to identify use of the PPE and purposes apply PPE when site workers carried out the hazardous work in construction site. Interviewees require to explain how their apply PPE when carried out the hazardous works. Question 2: In your opinion, what are the causes of accident happened in construction site? This question attempts to find out the factors and causes of accidents happened in construction site. Question 3: In point of view, what are the effects of accident occurs in the site? Please elaborate. This question attempts to request the interviewees to mentioned the effect that generated by accidents occur on site. Question 4: How does the first-aid unit locate in construction site? This question attempts to determine how interviewees locate the first-aid unit in their construction site. The below questions were designed based on Objective 2 Question 5: In practical standard, what are the roles of a Safety and Health Officer? This question attempts to identify the tasks and works should carry out by a Safety and Health Officer. Furthermore interviewees are requiring to elaborate what are the scopes of work of a Safety and Health. Question 6: Who is responsible for risk assessment and hazard control? This question attempts to find out who is responsible for risk assessment and hazard control. Question 7: What are the procedures for risk assessments? This question attempts to determine process of risk assessment to be carried out before and during the life of project. The below questions were designed based on Objective 3. Question 8: Who is responsible for safety and health training? This question attempts to find out who responsible for safety and health training. Question 9 Based on your experience, what are the elements needed to cover during the safety and health training? This question attempts to determine the contains of safety and health training. Beside that, interviewees have to explain what to be trained during the safety and health training. Question 10: In your organization, did the site personnel receive the refresher Safety and Health training? If yes, please explain how frequent the training held and how long of the training period. This question attempts to find out does every construction company have provide refresher Safety and Health training to their workers.
Wednesday, October 2, 2019
Steel Plant EAF Electrical System :: essays research papers
The modern steel plant receives low current, high voltage power from the generators of the electrical utility company. The purpose of the steel plant primary transformer is to step-down this voltage. The transformer thus provides high current, low voltage power for the EAF furnace. Large furnaces with transformers rated at 100MVA or higher is not uncommon. There are usually two stages to this process. The transformer first steps-down the voltage from high to medium levels. There are different standards for a ââ¬Å"medium-level voltageâ⬠in different countries; usually between 30 to 33 kV for Europe and Japan, but for the USA it is usually 34.5 kV. Finally, a heavy duty furnace transformer powers the EAF. This special furnace transformer is designed to allow the electric arc to operate within the desired current and voltage range. To safeguard the EAF electrical system from the primary power supply are two types of switches: a vacuum switch and a motorized disconnect switch. These two switches are designed to isolate the EAF electrical system from the primary transformer in case of an emergency. Other electrical systems around the EAF are the delta closure, the power cables, the current conduction arm, and the electrode holders. The power cables provide a connection between the delta closure and the current conducting arm. It is usually made of copper wires, with a rubber water jacket around the outside for water-cooling the cables. The power cable is connected with the current conducting arm, usually made of copper clad steel or aluminum alloys. This system weighs a lot less than the old bus-bar design that a lot of the older furnaces used. The current conducting arm conducts current directly from the power cable to the electrode holders. The electrode holders must withstand thermal cycling (not so much for our furnace, since our furnace should have a continuous feed) and severe mechanical loading and wear due to vibrations, torsion forces and such.
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