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Corona discharge often occurs in high voltage equipment and transmission lines with the elevating of the electrical network capacity and voltage level, which can lead to noise, loss of power and interference with TV and radio. Worse, the insulation of power equipment might be badly destroyed. Therefore, corona discharges in power system get more attention. In this paper, a non-line monitoring system of double channel ultraviolet is introduced for detecting the UV spectrum in ultraviolet sun-blind band (240~280 nm) of the corona discharge in the high voltage equipment. And also, the IHS space image fusion algorithm is proposed to locate where corona discharge occurs.