Analysis Of Thermal Radiation And Temperature Response On Insulator Surface

During the long-term operation of power system equipment, ambient temperature, current heat, and external heat sources all contribute to the thermal equilibrium state of suspension type insulator. Thermodynamic theory classifies heat transfer into three basic mechanisms: conduction, convection, and radiation. Radiation is a process of energy transfer through electromagnetic waves; it does not require a physical medium for heat exchange, and radiative heat transfer exhibits a non-linear relationship with temperature.

composite tension insulator, located inside overhead lines or GIS (Gas Insulation System), has a measurable thermal radiation distribution between its surface and the surrounding environment. The Joule heat generated during the operation of the conductor and the energy generated by the polarization of the dielectric under the high voltage electric field are emitted into the surrounding space through radiation. As a result, thermal radiation occurs on the surface of high voltage transmission line insulators. This radiation is determined by the thermal radiation characteristics of the overhead power line insulators material and is also affected by the surface temperature field.

When detecting the thermal state of tension insulator, the industry uses infrared thermography to receive the infrared energy radiated by dead end insulators and convert it into a thermal image to analyze its surface temperature distribution. Based on the results of infrared thermography analysis, a temperature field model of dead end suspension insulators can be constructed to identify normal and abnormal temperature change curves, thereby reflecting the internal heat flow and material thermal response characteristics.