Infrared Technology In Non-destructive Testing Of Power Fittings: State Sensing Method

In the field of power equipment maintenance, understanding the operational status directly impacts maintenance decisions and asset management strategies. For the critical transmission device electrical transmission line hardware fittings, temperature anomalies and changes in contact conditions may occur during long-term service. Traditional visual or tool-based contact inspection methods are insufficient to obtain internal thermal field information. In recent years, infrared technology, as a mature thermal imaging inspection method, has been incorporated into the transmission line condition assessment system. Under field conditions, it can acquire surface thermal distribution data of equipment, assisting in the analysis of local thermal characteristics of connection nodes and fittings, and has practical value for understanding the internal operational status.

Thermal Image Data Acquisition and Processing Flow

Infrared detection is based on imaging the infrared radiation of the target surface. An infrared thermal imager acquires temperature field images and converts them into analyzable thermal maps. When performing hardware fittings for transmission lines testing, the instrument is typically deployed non-contactly, aligned with the connection points and fastener areas at an appropriate distance to form a continuous frame sequence:

• Field deployment: Select representative test points and arrange infrared thermal imagers to cover common load paths of power fittings.

• Data Acquisition: The thermal imager captures multi-angle thermal images, reflecting the surface temperature gradient of each fitting location.

• Image Processing: Software analysis of temperature distribution and trends in thermal images identifies areas of temperature anomalies.

• Condition Assessment: Combining electrical load parameters and environmental conditions, potential thermal anomalies are classified and assessed.

This process ensures the continuity of the detection data over time and facilitates subsequent data comparison and long-term archiving of monitoring results.

Field Application and Data Utilization

• Image Classification and Interpretation: The generated thermal images reveal the thermal response of each connection point of the power fittings, allowing for analysis of thermal field differences under different load levels.

• Temperature Trend Analysis: Analyzing temperature trends in continuous thermal image sequences helps identify operational fluctuations and potential anomalies.

• Report Generation: Standardized output templates are used to organize the detection results, providing a basis for subsequent maintenance plans and technical discussions.

The above process and analytical framework provide a structured reference for the deployment of infrared technology in power fitting condition monitoring, helping maintenance personnel to deeply understand the relationship between thermal field response and field data performance.