Internal abnormal diagnostic method of the oil-immersed electrical machinery and apparatus which uses the gas density in the oil, the internal abnormal diagnostic system, decision tree compilation method for internal abnormal diagnosis

摘要

Internal abnormal diagnostic method of the oil-immersed electrical machinery and apparatus which uses the gas density in the oil which possesses the diagnostic precision above equality to the diagnostic specialist who reaches to fixed level, the internal abnormal diagnostic system and that decision tree compilation method for internal abnormal diagnosis is offered are designated as purpose. As for this invention, with the computer, to decide the type of internal abnormality of oil-immersed electrical machinery and apparatus of drawing up the decision tree in order being the method, the computer, The standardization data constellation which converts density of the plural gas kinds which melt in every each abnormal case in the insulating oil of the oil-immersed electrical machinery and apparatus to ratio is drawn up, The digitizing data constellation which is converted to the attribute which plural it disperses converts density ratio of each gas kind which forms the said standardization data constellation, with the specified threshold which is set every gas kind is drawn up, It is the decision tree compilation method of abnormality inside the oil-immersed electrical machinery and apparatus which draws up the decision tree in order to decide the type of internal abnormality of oil-immersed electrical machinery and apparatus on the basis of the said digitizing data constellation, with the analysis which uses the formula of specification. Selective figure Figure 1