Design considerations for modern 400 kV AC substation in coastal area: what is missing in IEC/CIGRE requirements

摘要

This paper presents the results of a pre-study for refurbishment of a 400 kV AC substation located at the West coast of Sweden, i.e. in polluted environment. The existing insulation design is based on porcelain insulation for both apparatus and support insulators supported by automatic washing system, which is applied on energized insulators. Careful statistical dimensioning of different new modern types of insulators included all options, i.e. porcelain, composite, Room Temperature Vulcanized (RTV) silicone rubber coated porcelain and hybrid porcelain/composite. Each possible insulation option was investigated in detail taking into account: 1. Estimated service experience; 2. Estimated service life in Swedish West coast environment; 3. Level of standardization in IEC/CIGRE. A number of missing IEC/CIGRE requirements was identified and is discussed in the paper.