The safe operation of dry-type air-core reactor

as a key element in power system

is of great importance to the power transmission reliability.In this paper

the structure characteristics of dry-type air-core reactor and thermal endurance properties of insulation material are described

the material and structure factor affecting the endurance of reactor

the influence of thermal and mechanical load to the structure and insulation coordination are analyzed.The temperature rise limit specifications of China National Standard for different reactors are introduced;the influence of processing methods and design to its safe operation are presented;the operation maintenance and daily inspection for assuring safety of the reactor are put forward.