三相变压器短路电抗在线检测方法研究

A novel on-line detection method to monitor the short-circuit reactance of three-phase transformer

为了能及时发现变压器的事故隐患、延长变压器的使用寿命及保证整个电力系统的安全稳定运行,需要对变压器绕组变形的检测方法进行研究。变压器的短路电抗值是由绕组的几何尺寸、空间位置等因素所决定,当其绕组发生变形时,短路电抗值发生变化,测量短路电抗变化情况可判断变压器绕组是否变形。文章提出了一种三相变压器短路电抗在线检测新方法,可在线计算变压器短路电抗,对变压器进行绕组变形进行在线检测,仿真和试验表明本方法的可行性和有效性。

The online diagnose on the condition of the transformer is of great importance to find the hidden peril of faults about transformer as soon as possible,as well as prolong the working life of transformer and keep the safe and reliable operation of the power system. The transformer short-circuit reactance is affected by winding geometry,spatial location and so on. When winding deformation of transformer happening,the short-circuit reactance will be changed accordingly. In this paper,a new way of calculating the short-circuit reactance of three-phase transformer during its operating state is proposed directly,meanwhile,it also can conduct online detection for the winding deformation of transformer. The simulation and experimental results verify the effectiveness and feasibility of the proposed method.