Study on Life Estimation System of Substation Dry-Type Reactor

Based on the theory of electromagnetics and heat transfer, this paper theoretically analyzes the heat generation principle and heat dissipation methods of dry-type reactors. The heat generated of dry-type reactor mainly comes from their eddy current loss caused by proximity effect and DC resistance loss. The eddy current loss caused by skin effect can be neglected. The dry-type reactor is cooled by heat conduction, heat radiation and thermal convection. And the thermal convection coefficient h is simplified by temperature boundary layer model in this paper. Secondly, the theoretical model of temperature field in dry-type reactor is established and theoretically derived. The results show that the upper third of the dry-type reactor has the highest temperature. Thirdly, based on the temperature field distribution, this paper uses the Arrhenius equation to study the life evaluation algorithm of dry-type reactor. Finally, a monitoring system for life assessment of dry-type reactors was developed.