DEVELOPMENT AND TESTING OF 1100 KV GIS HOLAUS WALTER, RIECHERT UWE, SOLOGUREN DIEGO, KRUSI URS

摘要

Current switchgear projects are strengthening research, development and standardization in the ultra-high voltage (UHV) sector. Many years of experience at voltage levels of up to 800 kV are available as the basis for developing gas-insulated switchgear (GIS) for 1100 kV. Nevertheless, the individual components such as circuit breakers and disconnectors differ greatly from the known designs in some cases. As regards the circuit breaker, for instance, it emerges that a design with the closing resistorin a parallel tank is advantageous. The VFT (Very Fast Transient) overvoltages become more important as regards the disconnector design. However, major challenges for the development and testing of a UHV GIS are posed not only by the design but also bythe limited testing possibilities, in particular for the partial discharge level, disconnector circuits and power tests. The outlay for development and type approval tests increases substantially because the tests have to be carried out in different laboratories distributed across the world. The laboratories' limits are reached - and in some cases even exceeded - by many of the tests. This also results in new terms of reference for the standardization sector in order to accommodate the special requirements for the UHV level. The experience gained by the manufacturers and institutions participating in the UHV demonstration project may be helpful here.