Oil paper insulation aging state evaluation method and system based on interface charge decay time

• Main Authors: YAO JIE, CHEN RONGJIA, MA YUNTONG, LYU ZEPENG, WU KAI
• Format: Patent
• Language: Chinese; English
• Published: 23.12.2022
• Subjects: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; PHYSICS; TESTING

The invention discloses an oil paper insulation aging state evaluation method and system based on interface charge decay time. The method comprises the following steps: acquiring space charge distribution of a paper insulation sample; calculating a decay time constant and an interface potential barrier of the interface charge, and increasing the decay time constant of the interface charge in the depolarization process along with the deepening of the oil paper insulation aging degree; measuring the polarization current and the depolarization current of the oil-paper insulation sample, calculating the depolarization current with declined index, and obtaining the change of the decay time constant of the interface charge in the depolarization process; fitting a time constant of the interface charge attenuation characteristic acting on the depolarization current; and evaluating the oil paper insulation aging state. The oil-paper insulation aging and the trap level of the oil-paper material are related to the condu