基于变压器振动的分布式绕组状态检测装置的开发与应用

Development and application of a distributed winding state detection system based on transformer vibration

振动法是一种通过采集变压器箱壁振动信息来判断内部绕组健康状态的方法,具有检测效率高、检测精度高等特点。理论研究表明稳态振动信号较为微弱,受到绕组健康状态、变压器运行时电流电压值、环境信息等多重因素影响。传统的振动采集装置多为一体式结构,在采集精度及抗干扰能力上存在缺陷,且由于振动信号源与电流电压信号源异地分布无法完成同时采集,影响振动信息的判断。文中设计了分布式振动检测装置,在变压器旁安装高精度、抗干扰能力强的振动采集单元就地采集振动信号,在变压器二次端子处安装电流、电压采集单元,将得到的信号利用光纤统一发送至主控室内的上位机进行分析,采集单元间通过光纤对时实现同步采样。系统已在变电站内实现稳定运行。

The vibration method is a method for judging the health state of the internal winding by collecting the vibration information of the transformer tank wall,and has the characteristics of high detection efficiency and high detection precision.Theoretical research shows that the vibration signal is weak at steady state,and is affected by multiple factors such as the health of the winding,the current and voltage values of the transformer during operation,and environmental information.The traditional vibration acquisition device is mostly integrated structure,which has defects in acquisition accuracy and anti-interference ability.Because the vibration signal source and the voltage and current signal source are distributed in different places,they cannot be collected at the same time,which affects the judgment of vibration information.In this paper,a distributed vibration detection device is designed.The vibration collecting unit with high precision and strong anti-interference ability is installed next to the transformer to collect the vibration signal.The current and voltage collecting unit is installed at the secondary side terminal of the transformer,and the obtained signal is unified by optical fiber.It is sent to the host computer in the main control room for analysis,and the sampling unit realizes synchronous sampling through the optical fiber.The system has achieved stable operation in the Zhou Jiazui substation in Shanghai.