基于百分比的水平匝间故障检测算法研究

Research on Horizontal Interturn Fault Detection Algorithm Based on Percentage

变压器绕组匝间故障检测对于保证电力系统稳定运行有重要意义。变压器保护及时检测匝间故障(TTF)的早期发生对于系统的稳定运行至关重要。文章提出了一种基于百分比的匝间故障相关增量电流检测方法(PFRIC),用于精确检测1%绕组TTF的早期发生。利用增量电流的正负分量进行探测,通过引入工作电流和抑制电流,采用双斜率特性,将所提方法与TTF领域的先进检测方法进行比较,在2kVA的三相变压器上进行实验,检测时间仅为25ms,所提方法在重外部故障情况下的安全性得到提高,能够保护从两侧馈电的变压器以及多绕组变压器。

The detection of inter turn faults in transformer windings is of great significance for ensuring the stable operation of the power system.The timely detection of interturn faults(TTF)by transformer protection relays is crucial for the stable operation of the system.This article proposes a percentage based inter turn fault related incremental current detection method(PFRIC)for accurately detecting the early occurrence of 1%winding TTF.Using the positive and negative components of the incremental current for detection,the proposed method is compared with advanced detection methods in the TTF field by introducing working current and suppressing current,and using a dual slope characteristic.The experiment is conducted on a 2 kVA three-phase transformer,with a detection time of only 25 ms.The safety of the proposed method is improved in the case of severe external faults,and it can protect transformers fed from both sides and multi winding transformers.