wm5120309265 夏子瑜 电机学实验 三相变压器极性与联接组标号.doc

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1、Last week, our economic work Conference held today, held the Countys rural areas for work and five water treatment, three to split Conference, which this year was a matter of Thirteen-Five important meeting of our Countys economic and social development. The main task of the meeting was, on rural wo

2、rk and conscientiously implement the Central, provincial and municipal five water treatment, three to split series of important conferences, learn from the past, study deployment priority tasks this year. Just now, the XXX Deputy head and Deputy County magistrate, respectively, on the work of the XX

3、 was fully deployed, and put forward specific measures and requirements about is in place. County Environmental Protection Bureau, the XX town, town of XX 3 units for a position statement, resounding, demonstrated determination and confidence. Conference also recognition has advanced representative,

4、 this, I also representative County, and County Government, to by recognition of advanced said warm of congratulated! to rural, and water and three modified a split front General cadres workers extend sincere of greeting! following, I again told five points views: a, and deepening awareness, further

5、 enhanced work of sense and urgency since party of 18 session v plenary proposed has innovation, and coordination, and green, and open, and shared five big development concept Hou, rural and environment governance work can said was upgrade to has more high of strategy level, is Thirteen-Five build w

6、ell-off a top priority task. XX, County besides lingxi, Longgang, jinxiang, the Treasury, the hills, several industrial town outside the city centre, is basically belong to other rural areas, area, the vast rural population. Same time, the current and coming period, is the County into a crucial peri

7、od of the South Gate of XX beautiful, environmental regulation directly affects the effectiveness of the strategic objectives can not be achieved. Therefore, the focus on rural work and five water treatment, three to split, the XX economic and social development has an important role. Last year, thr

8、ough the joint efforts of the County, reform of the agricultural and rural development has made great progress in our County, environmental remediation and achieved initial results. Three agriculture agricultural modernization level continues to increase, new 4-level modern agriculture Park, release

9、d 20 agricultural leading enterprises above the county level, the County area of 200 acres of land more than eco-leisure, investments of more than 5 million Yuan reached more than more than 100 agricultural projects. Rural development has improved continuously, boutique line 1 completed the beautifu

10、l countryside, fine village 17, beautiful rural development conference was held in lingxi peach Lake in the city. Promote comprehensive rural reform, included in the provinces building three in one system of farmers cooperative economic organization first promoting the County. Improvement of farmers

11、living standards, poor farmers in less than complete elimination of 4600 Yuan, 8949, 19008. Five waters rule: the County invested 2.169 billion yuan, similar counties line the citys first complete the 42 km of sewage pipe network construction, completion rate ranked first in the city, won the provin

12、cial rural sewage treatment work better; key pollution sources such as electroplating, papermaking, chemical industry management through verification and acceptance of the municipal government, the County removed Black and odorous River, River waste, beginning of river ecological restoration effects

13、. Three modified a split aspects: County total demolition illegal area up 2.759 million square meters, completed City issued annual task of 153%, split against area ranking city second; completed three modified area 4.846 million square meters, completed City issued annual task of 403%, ranking city

14、 third, which village in the a target completed total city ranking first; County Government was named city level three modified a split work advanced. These achievements are hard won and should be appreciated. However, we are fully aware, the new period, and work in the countryside and the environme

15、nt facing higher standards and requirements, provincial party Committee offered to high level build a comprehensive well-off society goal requires no filth, dirty environment illegal buildings, into a well-off; municipal party Committee also proposes to build into the well-off benchmark goals of the

16、 city. Compared with the superior claim, South Gate of XX beautiful goal, my County San Nong and environment there are a number of weaknesses and gaps, highlighted in the following five aspects: first, agriculture remained low pattern. Low is reflected in the quality and low; short, value added of t

17、he industry chain is low; 123 fusion yield low employee age, low quality. Small is reflected in smaller, specialized cooperatives throughout the County there were 3,396, but on the scale of too little. San is reflected in production, management, services, decentralized, centralized, standardized, br

18、and, information and organizational level is not high. Second, the countryside is still in dirty phase. Dirty is dirty of rural sanitation situation has not changed. Chaos is a village in rural housing construction planning, construction of disorder, no drawings, no construction, no vetting four no

19、phenomenon, heap lying there. Bad is the weak rural base, village governance is poor. Thirdly, farmers continued to be persistent look. Old is aging, rural labor force accounted for 70% over the age of 50. Big is that the reform measures ground resistance, such as the transactions of property rights

20、, land replacement; public service supply gap, rural education, health care, pensions and other services can not meet the demand still difficult for poverty alleviation, with emphasis on poverty alleviation and 191. Hard is a peasants, peasants. Four water effects still lacks电机学实验报告班级： F1203008 姓名：夏

21、子瑜 学号： 5120309265 同组者姓名： 孙丞 李政实验时间： 2014年10月 22日 实验地点：电气工程实验中心 实验桌号：7成绩（指导教师写）：实验二三相变压器极性与联接组标号一、实验目的1. 掌握测定三相变压器极性的方法。2. 通过实验和作图的方法确定三相变压器的联接标号。二、实验项目1. 测定三相变压器的相间极性。2. 测定三相变压器高压侧与低压侧的同名端(极性)。3. 用时钟表示法确定三相变压器的联接标号。三、实验设备及仪器1. T 三相感应调压器 额定容量 10kVA，额定输入电压 380V，额定输出电压 0430V，额定输出电流 13.4A2. T1 三相变压器 3kV

22、A 380V/220V 4.54A/7.87A3. 交流电压表 500V4. 交流电流表 10A5. 万用表6过渡插座四、实验过程1. 三相变压器相间极性、高压侧和低压侧极性的测定(1)测定高压侧相间极性7/40首先将三相变压器 T1 的 12 个出线端随机接到过渡插座的 12 个接头上，用万用表电阻档测出三相变压器 T1 高压侧和低压侧属于同一绕组的出线端子，对 12 个出线端子暂定标记为 A、B、C、X、Y、Z 和 a、b、c、x、y、z。按图 2-1 连线，将三相调压器 T 输出电压调至零位。闭合电源开关，调节三相调压器使其端电压逐渐升高到 UAB=100V，读取 UCZ 电压值，若 U

23、CZ0，表明 A、X、B、Y 标记正确。若 UCZ100V，表明 B、Y 标记错误，应将 B、Y 标记互换。同样方法确定 C、Z 标记。T三相AXT1xa交流VBYyb电源CZzcV图 2-1 测定三相变压器相间极性接线图(2)测定低压侧相间极性将调压器输出端接到变压器低压侧 a、b 端，x、y 端用导线短接。闭合电源开关，调节三相调压器使其端电压逐渐升 Uab=100V，读取 Ucz 电压值，若 Ucz0，表明 a、x、b、y 标记正确。若 Ucz100V，表明 b、y 标记错误，应将 b、y 标记互换。同样方法确定 c、z 标记。(3)测定属于同一铁芯柱的绕组实验线路图如图 2-2 所示，

24、将变压器高压与低压绕组均接成 Y 接法，同时中性点用导线连接。将三相调压器 T 输出电压调至零位。闭合电源开关，调节三相调压器使其端电压逐渐升 U=100V，测量 UAa、UAb、UAc 电压值，其中二个电压值相等，另外一个就是同一铁芯柱。同样方法确定另外二个铁芯柱。T三相AXT1xa交流BYyb电源CZzc8/40AaoboAccbCBCBaA与a端点极性相同A与a端点极性相反图 2-2 测定三相变压器初、次级极性接线图及相量图(4) 测定初、次级极性实验线路图如图 2-2 所示，将三相调压器 T 输出电压调至零位。闭合电源开关，调节三相调压器使其端电压逐渐升高到 U=100V，测量 UAX

25、、UAa、Uax 电压值，若所测电压值为UAa =UAX-Uax 表明 UAX 与 UAa 是同相位，说明初、次标号正确。若所测电压值为 UAa =UAX+Uax表明 UAX 与 UAa 是反相位，应将次级标记互换。2. 确定三相变压器的联接组标号(1)确定 Yy0 联接组标号实验线路图如图 2-3 所示，将三相调压器 T 输出电压调至零位。闭合电源开关，调节三相调压器使其端电压逐渐升高到 U=100V，测量 UAB、Uab、UBb、UCc、UBc 电压值。将所测数据记入表 2-1 中。根据 Yy0 联接组的电压相量图可知UBb =UCc= (K-1)UabUBc= Uab式中 K=UAB/U

26、ab 为变压器线电压比。若实测电压 UBb、UCc 及 UBc 与按上两式计算值相同，则表明该变压器的联接组标号为Y/y0。9/40图 2-3 测定 Yy0 联接组标号接线图及相量图(2)确定 Yy6 联接组标号实验线路图如图 2-4 所示，将三相调压器 T 输出电压调至零位。闭合电源开关，调节三相调压器使其端电压逐渐升 U=100V，测量 UAB、Uab、UBb、UCc、UBc 电压值。将所测数据记入表 2-1 中。根据 Yy6 联接组的电压相量图可知UBb =UCc= (K+1)UabUBc= Uab式中 K=UAB/Uab 为变压器线电压比。若实测电压 UBb、UCc、及 UBc 与按上

27、两式计算值相同，则表明该变压器的联接组标号为 Yy6。10/40图 2-4 测定 Yy6 联接组标号接线图及相量图(3)确定 Yd11 联接组标号实验线路图如图 2-5 所示，将三相调压器 T 输出电压调至零位。闭合电源开关，调节三相调压器使其端电压逐渐升高到 U=100V，测量 UAB、Uab、UBb、UCc、UBc 电压值。将所测数据记入表 2-1 中。为避免低压绕组连接错误而造成短路，在低压绕组三角形内串一电流表，高压侧由零逐渐调高，观察电流表读数，若连接方法正确，则电流表读数应为零或接近零。根据 Yd11 联接组的电压相量图可知UBb =UCc= UBc= Uab式中 K=UAB/Ua

28、b 为变压器线电压比。若实测电压 UBb、UCc、及 UBc 与按上两式计算值相同，则表明该变压器的联接组标号为 Yd11。11/40图 2-5 测定 Yd11 联接组标号接线图及相量图(4)确定 Yd5 联接组标号实验线路图如图 2-6 所示，将三相调压器 T 输出电压调至零位。闭合电源开关，调节三相调压器使其端电压逐渐升 U=100V，测量 UAB、Uab、UBb、UCc、UBc 电压值。将所测数据记入表 2-1 中。为避免低压绕组连接错误而造成短路，在低压绕组三角形内串一电流表，高压侧由零逐渐调高，观察电流表读数，若连接方法正确，则电流表读数应为零或接近零。根据 Yd5 联接组的电压相量

29、图可知UBb =UCc= UBc= Uab式中 K=UAB/Uab 为变压器线电压比。若实测电压 UBb、UCc、及 UBc 与按上两式计算值相同，则表明该变压器的联接组标号为 Yd5。图 2-6 测定 Yd5 联接组标号接线图及相量图12/4 五、实验数据及参数分析实验数据计算数据UABUabUBbUCcUBcKUBbUCcUBcYy0102.060.4141.2441.2087.101.67540.540.587.6Yy6100.560.01160.51159.01141.021.677159.8159.8140.3Yd11100.034.0872.4571.3571.722.93572.

30、572.572.5Yd5100.234.07130.72130.85131.702.940130.7130.7130.7表 2-1 三相变压器联接组实验数据1. 将不同联接组电压UBb、UCc、UBc值与计算值进行比较，分析误差原因。答：三相电源没有达到绝对对称仪表示数有误差2. 画出测定低压侧相间极性的接线图。六、思考题1. 测定三相变压器联接组标号时为什么将高压、低压绕组的A、a两端子用导线连接？答：A,a两端用导线连接后，相量图的A，a两点重合，以便根据几何关系得出某联接组的校核计算式。2. 为什么同类(Yy或Dd)联接组的标号是偶数，而不同类(Yd或Dy)联接组标号为奇数？答：因为在同

31、类联接组的相量图中，EAB与Eab的相位差始终为30的2n倍，所以标号为偶数；在不同类联接组的相量图中，EAB与Eab的相位差始终为30的2n+1倍，所以标号为奇数。七、心得体会这次实验操作过程并不复杂，按照指导书上的操作步骤一步步测出三相变压器的接线端，然后分别测4种接法下的电压特性，麻烦一点的也就是测接线端了，我们做实验的时候只是按照指导书上的操作来进行，这样是能测出结果，可是我们并不知道为什么是这样的现象。在写实验报告时，我们分析了三相变压器的原理，理解了测量接线端每个步骤的目的，这样才算是真正把这个实验弄懂了。我觉得做实验需要多思考，不仅仅停留在指导书上的内容，按步骤做完了事，而是应该理解整个实验过程，这样才能学到有用的东西。