感性负载直流电阻测试仪___说明书.doc

摘要
在现实生活中直流电阻的测试具有很重要,例如,电力变压器绕组直流电阻测量是变压器出厂及预防性试验的主要项目之一,电力变压器绕组具有大电感、小电阻的特点,其固有的时间常数较大,测量所需时间很长,因此研究缩短电力变压器直流电阻测量时间具有重要意义。
本设计结合目前较常用的各种快速测量方法,根据现场的实用性, 针对绕组直流电阻测量工作中存在的问题,介绍一种利用恒流源实现感性绕组直流电阻快速测量的方法。利用恒压源对绕组进行充电,解决因电感而影响测量时间,充电结束利用恒流源进行供电,保证被测绕组电流恒定,利用A/D转换器将被测绕组的电压值输送到单片机中,由单片机进行数据处理,将电压值转换成电阻的实际值,由LED出来。实现直流电阻的快速、智能化测量。
关键词:恒流源感性绕组单片机 A/D转换器
Abstract
Accordance with the existing problems in measuring the DC Resistances of windings,the author introduces a method by means of constant voltage source to achieve fast measurement for the DC resistances of inductive coils. It is fast,reading stability,strong resistance to interference and acts well in practical test of dc resistance is of great significance for the practical instance, Transformer’s DC resistance measurement is one of the primary prevent test before transformer leaving factory and precautionary,and the DC resistance must be measured in the course of manufacture,heavy repair ,connective test,testing average temperature rise and fault diagnoses,SO it is quite vital to measure DC resistance of windings power transformers usually have big inductance but small resistance,they have big inherent time of measuring DC resistance is very time gose by,the temperature rise ,which causes the mistakes in the it is very important to study to shorten measuring this new rapid measuring method is bining the constant voltage source and constant-current source,make the control of microcontrolle,in order to fast measure transformer’S DC resistance.
Key words: constant current source; inductive coils; microcontroller; A/ Dconverter;
目录
第1章设计任务

、功能及技术指标



第2章设计说明





第3章硬件设计

恒流源的设计