PARTIAL DISCHARGE DETERMINATION DEVICE AND METHOD

An object of the present invention is to propose a partial discharge determination device and method that can reliably determine the amount of partial discharge occurring in an underground power transmission cable. A distribution pattern of a set of the charge amount and the occurrence phase angle of each partial discharge occurring in a period of one or more cycles of an applied voltage of a power transmission cable is sequentially generated, a first classification process in which the distribution pattern is classified into any one of classes on the basis of a standard distribution pattern for each class, each class representing a state of degradation of the underground power transmission cable based on the amount of partial discharge, and a second classification process in which the distribution pattern is classified by clustering, a classification result by the first classification process is evaluated on the basis of a classification result by the second classification process, and the amount of partial discharge is determined based on the evaluation result.