基于ARM的电流互感器特性测试仪设计

基于ARM的电流互感器特性测试仪设计

文档编号:CK126 文档字数:13659,页数:51

摘要
本文介绍采用先进芯片技术（32位ARM微处理器、16位6通道同时采样AD转换器）和软件技巧（软件同步采样、数字校准）设计一种用于电力试验的电流互感器综合特性测试仪，该仪器能进行保护用电流互感器的伏安特性试验、变比极性试验、以及二次阻抗测试和10%误差曲线绘制。传统的电流互感器特性试验方法，尤其是伏安特性曲线的绘制，不但复杂费力，而且手动升压和人工读数都给试验带来较大误差。由此，研制一种全自动的电流互感器特性试验仪是非常必要的。实现全自动检测的试验仪，其用于励磁的工频升压器脱离了手动操作而由伺服电机驱动，而且为适应各种情况，还具有变速率驱动功能；试验仪能在波形严重畸变情况下准确测量试验电压和励磁电流；能显示、打印和保存试验数据和曲线。这种全自动的试验仪大大提高了保护用电流互感器特性试验的正确率和效率，降低了试验人员的劳动强度。

关键词：电流互感器测试仪伏安特性 10%误差曲线打印曲线

Abstract
This article describes a design of Current Transformer Comprehensive Character Tester for power test by using advanced chip technology(32-bit ARM microprocessor, 16-bit 6-channel AD converter sampling at the same time)and software skills( synchronous sampling, digital calibration).The instrument can perform volt-ampere characteristic experiment , transformation ratio and polarity experiment , secondary impedance test and 10% error curve drawing for protective current transformer. The traditional testing method for current transformer, especially when drawing the volt-ampere characteristic curve, is not only complex and laborious but also makes greater errors by manual boosting and reading. Thus, it is very necessary to develop a fully automatic Current Transformer Comprehensive Character Tester. To achieve automatic detection, the power frequency booster used for excitation in the test device detaches from manual operation, driven by servo motor, and what’s more, it has function of variable rate driving to adapt to various conditions. The test device can measure the testing voltage and excitation current accurately even if in the case of serious waveform distortion.It also can display, print and save test data as well as curves. This automatic tester greatly enhances the accuracy and efficiency of the characteristic testing for protective current transformer, reducing the labor intensity of the test personnel.

Keywords：current transformer; tester; volt-ampere characteristic; 10% error curve;
Print curve

目录

摘要……………………………………………………………………………. . .……………..Ⅱ
1 前言……………………………………………………………… …………………………..1
2 总体设计方案…………………………………………………………… …………………2
2.1 系统总体结构…………………………………………… … … ………………….…2
2.2 系统设计原理……………………………………… …………………………….......3
2.3 误差改进环节………… ………………………………………………………..…… 5
3 系统硬件部分…………………………………………………………… …………………6
3.1 主控制器………………………………………………………….... . ... ... .…………7
3.2 A/D转换器………………………………………………………......….........…….....7
3.3 液晶显示模块………………………………………………………......…....…….......9
3.4 键盘输入模块…………………………………………………………......…….........13
3.5 打印模块………………………………………………………….... ... ...…... ……. .14
4 系统软件部分…………………………………………………………… …………………16
4.1 系统集成开发环境………………………………………………………………....…16
4.2 显示程序编写……………………………………………………………………....…17
4.3 键盘操作程序编写………………………………………………………………....…19
4.4 打印程序编写……………………………………………………………………....…23
5 系统调试……………………………………………………………………………….….. 25
5.1 硬件调试……………………………………………………………………… ……...25
5.2 软件调试………………………………………………………………………………25
5.3 系统改进方向…………………………………..……………………………………..25
6 总结………………………………………………………………………………………….27
致谢……………………………………………………………………………… ……………...27
参考文献………………………………………………………………………………………...28
附录1 电路原理图…………………………………………………………… …………......30
附录2 液晶显示实物图……………………………………………….….……......30
附录3 打印子程序……………………………………………….………….…......31

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