短路冲击下变压器绕组状态在线诊断  

On-line diagnosis for a transformer winding's stateunder short-circuit shock

作　　者：邵宇鹰[1,2] 徐剑[3] 饶柱石[1] 金之俭[3] 姜益民[4] 傅坚[5] 

机构地区：[1]上海交通大学机械系统与振动国家重点实验室,上海200240 [2]上海市电力公司技术与管理学院,上海200025 [3]上海交通大学电气工程系,上海200240 [4]华东电网有限公司,上海200122 [5]上海市电力公司,上海200122

出　　处：《振动与冲击》2011年第2期173-176,共4页Journal of Vibration and Shock

摘　　要：在线实时检测变压器绕组状态,对保障变压器正常运行尤为重要。绕组的振动信号能反映出绕组的状态,而这些信号能通过布置在变压器箱体上的加速度传感器测量到。通过对某大型变压器短路冲击实验的在线实时检测,利用振动烈度和基于时频分析的方法对变压器绕组的振动信号进行分析。研究表明,与常规电抗法检测相比较,用时频分析方法能更明确反映出变压器绕组的故障特征。In order to keep safe operation of a power transformer,it is important to monitor the state of the transformer winding on real-time basis.The winding＇s state is reflected by its vibration signal measured with accelerometers located on the transformer＇s tank.In a short-circuit shock test for one large power transformer,the state of every phase of the winding was initially detected with the change of the transformer＇s vibration intensity.The method of time-frequency analysis was then used to analyze the vibration response signal in order to confirm the winding＇s state.Compared with the traditional method based on short-circuit reactance measurement,the time-frequency analysis could exactly reveal the fault characteristics of the winding.

关 键 词：变压器绕组 振动 振动烈度 时频分析 在线诊断 

分 类 号：TP206.3[自动化与计算机技术—检测技术与自动化装置]