METHOD AND EQUIPMENT FOR MEASURING CRACK IN INSULATION COATING

PURPOSE:To provide a method and equipment for measuring crack in the coating of an insulated wire nondestructively and easily grasping crack in the insulation coating of a line under service. CONSTITUTION:The equipment for measuring crack in an insulation coating comprises means 1, 2, 3, 4, 8 for me...

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Bibliographische Detailangaben
Hauptverfasser:	YOSHIDA HIROTAKA, SAKIDA EIICHI, NAKAMURA TOMOHIKO, MASUDA JUNICHI, SHINDO HIROAKI
Format:	Patent
Sprache:	eng
Schlagworte:	INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES MEASURING PHYSICS TESTING
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Beschreibung
Zusammenfassung:	PURPOSE:To provide a method and equipment for measuring crack in the coating of an insulated wire nondestructively and easily grasping crack in the insulation coating of a line under service. CONSTITUTION:The equipment for measuring crack in an insulation coating comprises means 1, 2, 3, 4, 8 for measuring the insulation resistance of a wire material 11 to be measured, a memory 5 for storing outputs from the measuring means 1, 2, 3, 4, 8, an operating section 6 for comparing the differentiation results thereof with a predetermined variation value of insulation resistance, and an output unit 7. The probe electrodes 1, 2 in the measuring means 1, 2, 3, 4, 8 are shifted by a predetermined distance in the longitudinal direction of the wire material 1 and the operating section 6 measures a crack based on the number of times when the predetermined variation value of insulation resistance is exceeded.