The Application Situation of the Non-contact On-line Detection Technology on Overhead Equipment in Distribution Network

The application of non-contact on-line detection technology on outdoor overhead equipment monitoring in distribution network is useful to find the equipment defects and avoid the insulating breakdown. The infrared thermal imaging method, ultrasonic based discharge detection method, ultraviolet imaging discharge detection method and UHF based discharge detection method are commonly applied. However, according to the feedback from the field operation, these methods are not enough to meet the requirements of the equipment condition monitoring, limited by the characteristics of the detection technology or the device. For example, the infrared thermal imaging detection has been widely used in the detection of abnormal temperature rise of equipment, but it also needs to combine with reasonable inspection plan to improve the detection efficiency; ultrasonic based discharge detection can quickly diagnose the existence of defects, it is now on trial in the distribution equipment defect detection, but still need quantitative detection characteristics, to provide the effective basis for the defective equipment condition assessment; ultraviolet imaging discharge detection is mainly limited by the device cost and detection efficiency, it can be used to detect the important or the focused equipment; UHF based discharge detection can diagnose the discharge defects quickly, the UHF antenna array based technology can also be further studied for the automatic, accurate and efficient detection on distribution equipment. Therefore, in order to improve the power supply reliability of distribution system, it still need to continue to optimize the detection technology and improve the distribution equipment inspection strategy to further enhance detection accuracy and efficiency.