基于三相自搜寻比较法的电气设备过热故障识别方法

电力设备过热故障图谱识别是判断电力设备故障程度的重要手段。工程实际中通常是对变电设备热拍照并进行人工甄别。为提高设备热像图故障判定准确率和效率，本文针对电力三相设备的特点，提出了一种通过三相分区块自动搜寻及温度对比的过热区域判定方法，通过将三相设备热像图每相分离，调整为相似大小与姿态，将新图像分块进行对比，判定对应区块是否有异常温升，从而判定某相设备出现的热故障。试验结果表明，本文基于计算机自动搜寻和判定的设备热诊断方法能够更加高效准确地判定识别三相设备热故障，从而能够提高电力设备热故障检测的效率、准确性与自动化程度。

Overheat Fault Identification Method for Electrical Equipment Based on Three-phase Self-searching Comparison Method

Overheat fault atlas identification of power equipment is an important tool for judging the fault degree of power equipment. In engineering practice, thermal photography of substation equipment and manual screening are usually carried out. To improve the heat equipment's figure fault decision accuracy and efficiency according to the characteristics of the three-phase power, this study proposes an automatic search determination method; this method involves the use of the three-phase partition piece temperature contrast of overheating area to separate every figure of the three-phase equipment heat, adjustment of images of similar size and attitude, comparing the new image block, and determining whether there is a corresponding block of abnormal temperature rise to identify the thermal faults of certain phase equipment. The test results show that the equipment thermal diagnostic method based on computer automatic search and determination can identify the thermal fault of three-phase equipment more efficiently and accurately, which improves the efficiency, accuracy, and automation degree of thermal fault detection of power equipment.