突发短路试验中变压器振动监测系统的设计

突发短路试验能够对变压器的抗短路能力进行评估,而绕组在试验中是否发生形变是重要的判断标准。基于振动分析法的绕组状态检测技术具有灵敏度高、工作效率高等优点,但现有的变压器振动采集系统不能满足短路试验中对采集精度和防护标准的要求,文中设计了分布式变压器振动采集系统,在试验间内安装高防护等级、高精度的采集单元,将采样得到的振动信号就地转换为数字信号发送至控制室内的主控单元,避免短路试验中恶劣的电磁环境对采样信息产生干扰。后期可通过计算机对振动信号进行处理来分析绕组健康状态,目前系统已成功投入应用。

Design of a vibration monitoring system for power transformer in short-circuit test

The burst short-circuit test can evaluate the short-circuit resistance of the transformer,and whether the winding is deformed during the test is an important criterion.The winding state detection technology based on vibration analysis has the advantages of high sensitivity and high working efficiency,while the existing transformer vibration acquisition system cannot meet the requirements of acquisition accuracy and protection standards in the short circuit test.A distributed transformer vibration acquisition system is designed in this paper.A high-protection level and high-precision local unit is installed in the test room.The collected vibration signal is converted into a digital signal and sent to the main control unit in the control room to avoid the harsh electromagnetic environment to interfere with the sampling information during the shortcircuit test.In the later stage,the vibration signal can be processed by computer to analyze the health status of the winding.At present,the system has been successfully put into use.