SYSTEM-APPROACH FOR REALISTIC CONDITION ASSESSMENT OF HIGH- VOLTAGE GAS-INSULATED SUBSTATIONS

To ensure a solid basis for maintenance strategies a realistic condition assessment of the considered electrical equipment is crucial. With respect to their enclosure realistic assessing of gas-insulated substations is very difficult. Solely “soft facts” based on visual inspections cannot provide objective and credible data. Reliable “hard facts” emerged by measuring techniques are needed. The present paper deals with combining hard and soft facts in the context of non-invasive condition assessment of 123 kV high voltage gas-insulated substations. A system-approach, developed in cooperation of Westnetz GmbH and Wuppertal University, and its field application results are presented. The aggregation scheme for the various soft and hard facts is described, regarding specific uncertainty and probability numbers of hard and soft facts by the use of the theory of evidence.