油田电网短路故障测距算法

Distance location algorithm used to diagnose short circuit malfunction of electric net in oilfield

利用加信诊断原理,在通过端口比值法完成故障分支定位的基础上,利用传输线的输入阻抗特性推导出短路故障测距公式.该测距公式利用端口的测量值,既可对分支故障点距始端进行测距,也可对主支故障点距始端进行测距.采用最小二乘拟合技术对理论测距公式进行修正后,理论距离与实际距离的相对误差小于3.00%,能够满足油田电网故障测距的要求.

The formula for determining the measurement distance of the malfunction point from lines is derived with the principle of adding signal online and impedance in the lines. This formula not only gives the distance from malfunction point of the branched circuit to the initial point but also gives the distance from the malfunction point in the main circuit to the initial point. After the theoretical formula for calculating the malfunction, distance is modified with the least square method, the relative error between the calculated distance and the real distance is less than 3%, which is in the permissible range of measured distance in short circuit malfunction diagnosis of oilfield electric net.