基于ARM的電流互感器特性測試儀設計

測控論文編號:CK126   論文字數:13659,頁數:51

 目 錄
版權使用授權書………………………………………………………………..……………..Ⅰ
摘要……………………………………………………………………………. . .……………..Ⅱ
1 前言……………………………………………………………… …………………………..1
2 總體設計方案…………………………………………………………… …………………2
 2.1  系統總體結構…………………………………………… … … ………………….…2
 2.2  系統設計原理……………………………………… …………………………….......3
 2.3  誤差改進環節………… ………………………………………………………..…… 5
3 系統硬件部分…………………………………………………………… …………………6
 3.1  主控制器………………………………………………………….... . ... ... .…………7
 3.2  A/D轉換器………………………………………………………......….........…….....7
 3.3  液晶顯示模塊………………………………………………………......…....…….......9
 3.4  鍵盤輸入模塊…………………………………………………………......…….........13
 3.5  打印模塊………………………………………………………….... ... ...…... ……. .14
4 系統軟件部分…………………………………………………………… …………………16
 4.1  系統集成開發環境………………………………………………………………....…16
 4.2  顯示程序編寫……………………………………………………………………....…17
 4.3  鍵盤操作程序編寫………………………………………………………………....…19
 4.4  打印程序編寫……………………………………………………………………....…23
5  系統調試……………………………………………………………………………….….. 25
 5.1  硬件調試……………………………………………………………………… ……...25
 5.2  軟件調試………………………………………………………………………………25
 5.3  系統改進方向…………………………………..……………………………………..25
6  總結………………………………………………………………………………………….27
致謝……………………………………………………………………………… ……………...27
參考文獻………………………………………………………………………………………...28
附錄1 電路原理圖…………………………………………………………… …………......30
附錄2 液晶顯示實物圖……………………………………………….….……......30
附錄3 打印子程序……………………………………………….………….…......31

摘  要
 本文介紹采用先進芯片技術（32位ARM微處理器、16位6通道同時采樣AD轉換器）和軟件技巧（軟件同步采樣、數字校準）設計一種用于電力試驗的電流互感器綜合特性測試儀，該儀器能進行保護用電流互感器的伏安特性試驗、變比極性試驗、以及二次阻抗測試和10%誤差曲線繪制。傳統的電流互感器特性試驗方法，尤其是伏安特性曲線的繪制，不但復雜費力，而且手動升壓和人工讀數都給試驗帶來較大誤差。 由此，研制一種全自動的電流互感器特性試驗儀是非常必要的。實現全自動檢測的試驗儀，其用于勵磁的工頻升壓器脫離了手動操作而由伺服電機驅動，而且為適應各種情況，還具有變速率驅動功能；試驗儀能在波形嚴重畸變情況下準確測量試驗電壓和勵磁電流；能顯示 、打印和保存試驗數據和曲線。這種全自動的試驗儀大大提高了保護用電流互感器特性試驗的正確率和效率，降低了試驗人員的勞動強度。
關鍵詞：電流互感器 測試儀 伏安特性 10%誤差曲線  打印曲線

 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