The big leakage magnetic field of dry-type air-core reactor in operation will cause influence on the surround ferromagnetic material and the closed metal loop and

when serious

will endanger safe operation of the whole system.In this paper

the abnormal heating of the earthing bar of one 110 kV dry type air core reactor at one UHV substation is taken as an example so analyze the principle of heating sue to eddy current and circulation

check one by one and get the reason that the heat is due to lop circuit within the leakage magnetic of the reactor.The counter measure to solve the abnormal heating of the earthing is proposed

the suggestion is given from such four aspects as installation process

material selection

acceptance and operation & maintenance of the dry-type air-core reactor are given

which can provide a definite reference in avoiding the similar fault.