FLASHOVER DETECTOR FOR FAULT POINT ORIENTATION DEVICE

摘要

PURPOSE:To prevent malfunction due to the invasion of electric noise, by a method wherein decision whether phosphorescence and flashover light have existed simultaneously or not is decided when the flashover light has disappeared. CONSTITUTION:Flashover light 1C, generated in a sealed vessel 1, is introduced into a light branching device 4 through a fiber cable 3 to branch it into two lights. One of the lights is inputted into a flashover light detecting means to output the electric signal of a predetermined waveform while the other light is inputted into a phosphorescence generating means 30 to generate phosphorescence and the phosphorescence is converted into another electric signal by a phosphorescence detecting means 50 to output a predetermined waveform. The output signal is continued for several seconds after the flashover light has disappeared. The output signals of the flashover light detecting means 40 and the phosphorescence detecting means 50 are inputted into a decision device 14 to compare these two input signals and output an electric signal when both of the signals are not zero whereby the existence of the flashover light 1C is indicated. According to this method, the malfunction of an electronic circuit due to electric noise, which caused the emission of the flashover light, will never caused and mistaken decision will never be effected.