• 20年专注海外留学生essay代写

  • 50000+留学生essay代写首选品牌

  • 正规教育机构教你怎么写essay范文

当前位置: essay代写网 > 论文格式 >

时间:2021-09-11 07:00 来源: Essay代写

摘要:本文将简要介绍如何变压器的阻抗降低至3%,以保证短路测试脉冲电流的要求。......

1Introduction 介绍
 

20MVA的变压器通常用于ITER交流电流测试平台到晶闸管的转换器提供实验功率。然而,由于ITER测试平台的大的系统阻抗,从而降低变压器阻抗的要求通常在实际变压器行业满足。本文将简要介绍如何变压器的阻抗降低至3%,以保证短路测试脉冲电流的要求。如何确保符合用户的测定值变压器阻抗要求,以确保基本平衡的关键是变压器设计的三相阻抗。The transformer of 20MVA is commonly used to ITER AC current testing platform to provide experimental power for thyristor converters. However, due to large system impedance of ITER testing platform, the requirement of reducing transformer impedance is commonly met in actual transformer industry. This paper will give a brief introduction of how to reduce transformer impedance to 3%, in order to ensure short-circuit test pulse current requirements. How to ensure compliance with the measured value transformer impedance requirements of users and to ensure basic balance is the key to the three-phase impedance of the transformer design.
 

2The main technical parameters and load conditions of transformers变压器的主要技术参数和负载条件
 

2.1The main technical parameters

与20MVA的额定容量,能够1000MVA下工作0.5秒,10kV的/0.4kV的额定电压,为50Hz,3%,与该三相阻抗不平衡率不超过10%的短路电阻的额定频率,加入群Yd11,并一一绝缘等级水平。

 

With rated capacity of 20MVA, able to work under 1000MVA for 0.5s, rated voltage of 10kV/0.4kV, rated frequency of 50Hz, short circuit resistance of 3 percent, with which the three-phase impedance unbalance rate does not exceed 10%, join group of Yd11, and insulation rating level of eleven. 
 

2.2Load conditions

提供交流电源至可控硅变换器,转换器的负载是感应性负载。验证短路故障条件下,直流侧的负载转换器的动态稳定的特点。变压器必须能够提供所需的短路电流,最大短路电流冲击,以350KA的冲击,短路试验时间为0.5s,不小于4h两个短电路测试时间间隔。Provide AC power to thyristor converters, converter load is an inductive load. Verify that the DC side load converter dynamic stability characteristics under short-circuit fault conditions. Transformer must be able to provide the required short-circuit the impact of current, the maximum short circuit current impact to 350kA, short circuit test time is 0.5s, two short circuit test intervals of not less than 4h.
 

3Transformer impedance design calculations变压器阻抗设计计算
 

Due to the low short-circuit of the pulse transformer is with low voltage, and large electric current, so the key is of the transformer impedance design is to calculate transformer impedance and to estimate impedance of copper wire under low voltage.
 

3.1Transformer impedance design calculations

Considering the cost of transformer is highly influenced by the level of transformers impedance, the key is to design reasonable structure of low impedance transformer. There are three majormethods to reduce the two-winding transformer impedance as following. The first is to increase the core diameter was reduced a small number of turns increases the potential of winding turns. The second is to increase the electrical winding resistance that increases the height of the core high window. The third is split high and low voltage windings of the transformer impedance requirements of this article is only 3%, well below the normal capacity is 20MVA transformer impedance, not less than 8%. After considering the above three methods adopted by the special electromagnetic design optimization software to calculate and determine the impedance transformer body is 1.9%.
 

3.2Impedance transformer low estimate of copper wire

The low voltage transformer rated current up 28,867.5A, but this article requires closed delta connection. According to industry experience manufacturing low voltage high current transformer special "take the lead copper Low impedance transformer body impedance of 55%, that is 1.9 * 55% = 1.045%.
 

3.3Calculation of the overall impedance transformer

Whole body impedance transformer impedance and low-impedance copper wire, namely 1.9% + 1.045% = 2.95%.
 

4Structural design of the transformer winding and lead变压器绕组和引线的结构设计
 

To meet the convenience transformer wiring and ensure that the transformer has a high mechanical strength and good resistance to shock pulse short circuit capacity, low-voltage wire winding and structural design of the transformer to take appropriate measures, as follows.


4.1Transformer high voltage winding of the structural design

The transformer high and low voltage windings were split into equal volume of two windings disposed axially down, similar to the structure of the axial double split, and through external leads connected in parallel as figure 1. Segmented cylindrical of high voltage winding, two parts winding around the system as a whole, the whole cast. Low uses foil winding, winding two parts were cast; using a special technology of suit does not make the top and bottom halves displacement between the windings.

 

4.2Structural design of low voltage copper wire

Structure and low voltage transformer connection copper wire using the up and down two sets of low voltage windings connected to each triangle separately, then the corresponding phase by vertical copper connected in parallel to achieve "in the middle row of vertical copper leads to a three-phase outlet. This makes it easy lead copper solid and reliable support and positioning. Copper wire structure and connections, see figure 2.

 

5Transformer impedance measured data and analysis变压器阻抗测量数据及分析
 

After the completion of the transformer assembly of transformer impedance test, in the middle of a three-phase short vertical copper bars, the transformer is assembled as figure 3. Transformer impedance values measured figures are tested as Table 1.

 

 

From table 1 the measured data, the measured impedance transformer value far exceeded the design value, up 4.8 percent, the average of the three-phase impedance serious imbalance, the maximum phase of 6.1%, 4.2% minimum phase. For this purpose, after preliminary analysis, that the main reason may be the following five aspects. The first is a three-phase transformer body impedance and impedance imbalance is too large. the second is a low voltage transformer winding two parts each implemented delta connection, and arranged in the upper and lower ends of the transformer leakage between nearby magnetic zone, copper windings and electromagnetic coupling, copper mutual inductance between the larger, increasing the fillet impedance copper itself. the third is a three-phase transformer copper fillet length and be relatively inconsistent ay short, while cx longer, resulting in a three-phase copper impedance imbalance. Fourth, low voltage transformer for each phase two vertical copper is actually the line current of each phase is divided into two branches, the two branch current of the same size, the same direction, alternating magnetic flux generated mutually reinforcing, while the two branches of the mutual inductance is large copper, increasing the vertical copper per phase impedance. Fifth is an impedance transformer short circuit test points Select the possible unreasonable.

The above analysis has decided to carry out targeted impedance test trials, in order to find the product of serious impedance measured value is too large and the three-phase impedance based on the real reason for the serious imbalance.

6Field trials using the method of discovery, analyze problems场试验采用发现法,分析问题

6.1Impedance test transformer body

Its purpose is the measured impedance transformer body is too large and the three-phase impedance is balanced! Specific operating angle $ remove two parts connected to the low voltage winding of copper and three-phase vertical copper, head directly to the upper and lower part of the low voltage transformer windings Department shorted, see figure 4, the measured impedance values transformer body see table 2.  

本文标签: 变压器纽卡斯

[essay 美国大学入学]英国纽卡斯尔大学留学生literature review范文https://www.0592w.com/lunwengs/15110.html

essay辅导替代essay代写-正规代写机构教你怎么写essays范文-Essay写作格式网官方推荐

99.99%的用户同时也查看了:

[英国大学essay怎么写]留学...... 2021-09-11

本文是留学生论文写作指导,主要内容是针对留学生毕业论文中的开题报告,也就是proposal的具体写作方法进行讲解。......

标签:开题报告 proposal 

[essay的list怎么写]assignme...... 2021-09-09

assignment代写案例-Immediate Distribution of Information 本文就当代互联网科技崛起改变世界的利弊进行论述,作者通过介绍......

标签:信息即时分配 

[申请昆士兰需要essay么]海...... 2021-09-09

留学申请研究生RP(Research Proposal)创作经验浅析 很多留学生朋友其实并不是很了解RP,RP全称(Research Proposal) ,是留学......

标签:Research Proposal 

[英国考试写essay]留学生在...... 2021-09-09

留学生在英文论文写作中要注意六种例如的表达应用 留学生朋友们在英文论文写作中肯定会遇到一些需要举例举证的......

标签:

[oc和essay怎么写]留学生r...... 2021-09-09

出国留学的大学生由于自小就被教育成自动寻找答案习惯,国外本土的学生是在启发式的教育环境下成长的,在写论......

标签:留学生report 论文报告 

[放假essay代写]大学英文文...... 2021-09-09

summary writing是一种控制性的作文形式,它能使学生通过阅读原文,吸收原文的文章结构与语言方面的长处,一般不会......

标签:大学英文 文章Summary Summary摘要 

[essay一般多少页]英国留学...... 2021-09-09

组织变革的最大挑战是所采取的时间。如果计划是不正确的,目标是不明确的,那么整个变化过程可能需要更多的时......

标签:执行摘要范文 Executive Su 

[加拿大代写essay被发现了...... 2021-09-09

本文是留学生国际商务专业(International Business)essay写作范文,主要内容是讲述国际商务的具体定义,以及基于当代......

标签:国际商务 es 

[考生essay代写]留学生论文...... 2021-09-09

本文主要介绍了泥浆挖掘机的历史。本文是一篇论文summary ,可以让无从下笔的同学们学习下summary如何写作。......

标签:泥浆挖掘机 summary范文 mud diggers 

[澳洲essay修改机构]美国...... 2021-09-09

本文以通用电气公司作为案例研究的研究对象,以赛事理论为理论基础,分析其薪酬管理中的潜在问题。......

标签:通用电气 薪酬管理 赛事理论 收入差距 

[哈佛录取的50篇essay]英国...... 2021-09-09

本报告是英国市场学作业,report的主要内容是介绍healthfare餐厅,包括其创新理念和核心价值等内容。......

标签:report格式 英国report 餐厅报告 

[essay出国申请写的不好]...... 2021-09-08

本文旨在探讨使用一种营销组合工具,并以丰田为研究案例,以评估其有效性。它由2个部分组成。......

标签:丰田营销组合 案例研究 Toyota 

[美国common essay]斯巴达赌场...... 2021-09-08

发生资产或负债参与(如果有的话)的特殊性质,对其他风险和被套期预期交易套期预期交易量应充足的具体说明,......

标签:斯巴达赌场 资产 

[essay结论怎么写]提高盈利...... 2021-09-08

在大学里国际财务报告准则(IFRS)和学习财务报表分析技术在你的财务会计和财务报表分析的课程里,你不知道如何......

标签:盈利报告 财务报表分析 财务报告准则 

[英国硕士essay怎么写]中国...... 2021-09-08

绩效考核体系是人力资源管理的一个重要的核心组成部分。一个有效的绩效考核体系,对其他人力资源管理活动有积......

标签:中国联想集团 绩效评估 Performance  

[优秀essay范文140词]卡拉威...... 2021-09-08

根据所选择的部分的卡拉威出价显示在展览5,七个条件,上市时应考虑的卡拉威公司进行评估时,其供应商。......

标签:案例研究分析 产品质量 

[sat essay怎么写]高端Marke...... 2021-09-08

这是一篇关于该公司市场营销项目的Essay,高端分析高水平代写获得高分的案例,不论其格式还是内容都是达到优质水......

标签:Marketing Essay格式范文 

[英国申请学校需要essay吗...... 2021-09-08

英国留学生商科assignment代写中的report案例-BT三种策略走向世界成功之道 本篇为留学生作业网提供的assignment代写中的......

标签:

[essay的outline]教你做好pr...... 2021-09-08

这篇文章介绍了presentation如何进行收尾,在结束语中应该在对presentation的内容和观点做出总结。这篇文章还举出了两......

标签:presentation 结束语 总结 

[老外怎么写essay]Literatur...... 2021-09-08

Literature review可以定义为一种广泛的文献综述,通过文献综述,研究者可以从二次数据中获得研究者特别感兴趣的领域......

标签:Literature R 留学生作业 

[奥本大学申请essay要求]...... 2021-09-08

主要内容是作者针对自己攻读MBA学位总结学习反思与分析,包括未来的目标,实际问题,解决方法,以及列出个人发......

标签:Report格式范文 report范文 report怎么写 

[澳洲essay抄袭率40%]report格...... 2021-09-07

report格式一般由执行摘要,目录介绍,主题,结论/建议,参考文献。......

标签:report格式 report report格式范文 

[1000字essay多少钱]留学生毕...... 2021-09-07

毕业论文对留学生们来说无疑是一座大山压在肩膀上,时刻都能感到重重的压力。毕竟毕业论文是对留学生们留学所......

标签:哈佛文献 格式规范 

[哥伦比亚大学essay]英国...... 2021-09-07

本文叙述了英国留学生在写作essay的时候通常往往都会忽视文献这块内容,告诉大家需要注意的几点内容有助于大家更......

标签:英国essay essay作业参考 essay文献 

[并列关系的essay怎么写]...... 2021-09-07

社会影响:由于缺乏信任管理,会有员工流失。这反过来又会对管理层和员工的福利、工作满意度和承诺的绩效产生......

标签:工作满意度 承诺 案例研究 

[美国留学生essay范文]留学...... 2021-09-07

Coursework因老师教授课式,所以是不用写论文和答辩, 当在学校修满学分就可以毕业。国外硕士入学方式有以下为两种:......

标签:留学生Coursewor research硕士课程 硕士入 

Get in Touch

微信在线咨询

微信在线咨询

添加微信:
支持语音、图文实时沟通

Email实时沟通

Email实时沟通

您也可以通过Email联系我们
邮箱:

自助提交订单

自助提交订单

登陆ESSAY写作官网
在线自助提交订单

essay代写网专注【海外留学生essay代写20年】essay辅导代写正规品牌【留学生代写essay靠谱机构】提供英文essay代写、英国代写essay、美国代写Assignment、澳洲report代写、加拿大代写paper、essay范文格式讲解、Assignment代写、代写report、paper代写、essay代写一般多少钱、essay代写招聘、essay代写靠谱吗、英国研究生essay代写、留学生代写平台等辅导代写服务