Dry-type air-core reactors are widely used in China thanks to its advantages as simple structure

low price and basic maintenance-free. However

the fault of burning is frequently occurred after a long term operation. In this paper

take the recent one reactor burning fault in a 500 k V substation in China South Power Grid as an example

the basic fault situation is introduced

the operation action and fault oscillogram are analyzed

the reason for the fault is found and corresponding measures and suggestions are proposed.