高精度全自动变压器变比组别测试仪检定装置.docVIP

高精度全自动变压器变比组别测试仪检定装置 吴宏斌，李原，邓德勇，魏华 （国网电力科学研究院武汉南瑞有限责任公司，湖北 武汉 430074） 摘要：针对目前变压器变比组别测试仪的检定工作中存在的问题，如变比检测时，预置变比值数量少，且检测小变比值时精度达不到要求，同时存在操作复杂，工作效率低等诸多不足之处，本文介绍一种高精度全自动变压器变比组别测试仪检定装置。装置内部采用双级电压互感器，整体精度达到0.01%，在国内同类产品中处于领先水平；变比检测时的预置变比值为1～10000，满足JJG970-2002变压比电桥检定规程要求；控制部分采用C8051F023单片机+CPLD平台，操作显示部分采用当下流行的触摸屏设计，且电气回路通过继电器自动切换，大幅度提高了检测效率。与市场同类产品相比，本装置具有预置变比值数量多，精度高，操作简单等特点。 关键字：变比; 组别; 单片机；CPLD；触摸屏；双级电压互感器 中图分类号：TM938.4 文献标识码：B 文章编号： High accuracy automatic verification device for turn ratio and group transformer tester WU Hong-bin，LI Yuan(Wuhan Nari Limited Liability Company Of State Grid Electric Power Research Institute,Wuhan Hubei 430074，China) Abstract: A higher accuracy and automatic transformer’s turn ratio group tester verification equipment has introduced. It can solve the problems of little number variable ratio, the accuracy can not reach the requirements in turn ratio detection, complex operation and the low work efficiency. In this equipment a dual core structure internal voltage transformer is applied, the precision of measurement has achieved 0.01%, this is the leading level of similar products; the instrument can provide 1 to 10000 variable ratios in verification , meet JJG970-2002 Verification Regulation of Transformers Turn Ratio Test Sets; the control part use C8051F023 and CPLD as platform, a kind of popular touch screen design is also used in display , and the electrical circuit use relays for automatic switch over, which improve the efficiency of detection greatly. Compared with similar products in the market, this device have the more variable ratio, the higher accuracy, simpler operation, etc. Key words: turn ratio, group, MCU,CPLD, touch screen, dual core structure voltage transformer 0 引言 根据国家有关规定：变压器生产过程中的半成品和成品，以及新安装和检修后即将投入的变压器都必须进行变比测试。在《电力设备交接和预防性试验规程》中也要求对运行的变压器定期进行变比测量。通过对变压器的变比测试，就可以发现变压器的线圈短路、回路开路、连接错误、调压开关以及变压器中的内部故障或接触故障等，对高压大容量变压器乃至整个电网的安全稳定运行都具有重大意义。变压器变比组别测试仪用来检定变压器的变比及组别连接的正确性，其性能是否合格直接决定检定结果的正确性，因此对变压器变比组别测试仪的检定非常重