Nuclear-grade power cable aging degree diagnosis method

• Main Authors: WANG LEI, LIN SIYAN, ZHANG YIZHOU, GUI CHUN, WANG LIANG, ZHOU KAI, YUN HAO
• Format: Patent
• Language: Chinese; English
• Published: 22.09.2020
• Subjects: MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; PHYSICS; TESTING

The invention relates to the technical field of power cable aging evaluation, and particularly discloses a nuclear-grade power cable aging degree diagnosis method. The method specifically comprises the following steps: 1, carrying out a polarization-depolarization current test on a to-be-diagnosed cable to obtain a polarization current and a depolarization current of the to-be-diagnosed cable; 2,acquiring the interfacial polarization charge quantity of the cable to be diagnosed; and 3, obtaining an aging degree diagnosis result of the cable according to the interface polarization charge quantity. According to the method, the characteristic that the more serious the aging is, the more obvious the interfacial polarization phenomenon is can be utilized, so that the overall aging condition ofcable insulation is judged, meanwhile, no damage is caused to the insulation due to lower test voltage, the degree of influence of irradiation aging factors on the state of XLPE insulation is evaluated, and the aging degree o