电力变压器状态在线监测和故障诊断的新方法

Online monitoring and fault diagnosis of power transformer

介绍一种电力变压器绝缘在线监测和故障诊断的新思路,一方面通过在线油色谱分析仪检测6种故障特征气体含量和产气率,运用模糊理论及专家系统等人工智能技术对电力变压器的绝缘状态进行跟踪监测;另一方面尝试用参数辨识的方法进行变压器三相电气量的在线监测,依据变压器绕组结构及参数在故障前后会改变的原理,用参数辨识的方法,进行变压器绕组故障及其故障部位的识别,实现故障局部定位,提高变压器状态监测和故障诊断的准确性。

A method for on-line monitoring and diagnosing the power transformer is presented.An oil chromatograph analyzer is used to online monitor the volume and velocity of six fault characteristic gases,the insulation condition of power transformer is thus tracked by applying fuzzy technique and expert system.Furthermore,the three phase electrical parmeters of power transformer are online monitored,the fault and its location of transformer winding are thus detected by applying parameter identification according to the change of structure and parameters pre-and post-fault.It improves the accuracy of transformer fault diagnosis.