论文1.1.doc

毕业设计(论文) 题目：功率及功率因数测量 学生姓名：张晋瑜2012010101074 12通信工程A班 学生姓名：罗嘉煜2012010101042 12通信工程A班 所在学院：电子信息学院 指导老师：刘根据 完成时间：2016年5月  功率及功率因数测量 摘 要 功率是形容物体在单位时间内做功快慢的物理量。功率因数是一个物体的有效功率和视在功率的比值。随着现代科技的日益成熟与大范围的普及，人们对用电器的要求越发提高，旧式高损耗的产品已经不符合现代科技，从而大面积的被新型低损耗科技取代。测量一个用电器的功率及其功率因数是让人们更好的了解该用电器的可用性，测量功率及功率因数是提高功率因数的基础，提高功率因数得到更加合理实用的用电器。 在实验中测量一个物体的功率及功率因数也是极其必要的，功率及功率因数的测量能够挑选较好的元件使用。在生活中，为了提高电网的功率因数也必须要对电力负载进行测量。本实验是在规定电压的电路中测量该用电器的电流与电压得到功率和通过电压电流的相位差得到功率因数。 关键词：功率、功率因数、相位差、测量  Power and Power Factor Measurement Power is to describe physical body to do work in unit time speed. Power factor is the ratio of the active power and the apparent power of an object. With the increasing maturity of modern science and technology and the popularization of large scale, people on the requirements of electrical appliances more and more improved, old high loss of product is not in line with the modern science and technology. Thus being replaced by a new type of low loss Technology. Measuring an electrical power and power factor is make people better understand the availability of electrical appliances, the measurement of power and power factor is to improve the power factor, improve the power factor is more reasonable and practical appliance. Power and power factor measurement of an object in the experiment is extremely necessary, the measurement of power and power factor can choose better components. In life, in order to improve the power factor of the grid must measure the power load. The present experiment is to measure the current and voltage of the electric appliance in a specified voltage circuit to obtain the power, and the power factor is obtained by the phase difference between the voltage and current. Keywords：Power; Power Factor; Phase Different; Measurement  引言 功率是指物体单位时间内所做功的多少，是用来描述物体做功的快慢。功率的值越大代表该物体完成相等的功所需要的时间越短。功率的大小表征了做功快慢程度的物理量。单位时间内所做的功称为功率，用P表示。故功率等于作用力与物体受力点速度的标量积。 功率因数是衡量电气设备效率高低的一个系数。功率因数低，说明电路用于交变磁场转换的无功功率大，从而降低了设备的利用率，增加了线路供电的损耗。功率因数的大小与电荷负载性有