550kV HGIS

550KV HGIS As the domestic economy develops, the national power grid and substation development requires extremely high demand for the types and quantity of the high voltage apparatus. Currently the 550kV HGIS can be divided into two types: GIS and AIS. GIS requires much smaller occupied land and high reliability. Comparatively speaking, the AIS is much cheaper in terms of cost but occupying much more land. Therefore, many customers need an inter-mediate type combining both advantages of GIS and AIS. 1,High reliability High reliability can be ensured based on the conventional 252kV GIS, which requires less site work and fulfilling the switchyard requirement. 2,More usability Proven standard modular design, which has advantages such as simple structure, less installation work and cost etc. 3,Economically cost for HGIS is around 80% of that of the GIS and 45% of AIS, which is more economical. Item 550 GIS technical data Unit Installation Indoor or outdoor Ambient air temperature -35 40 °C Altitude 1000; 2000; 3000 m Seismic resistance capability Horizontal acceleration 0.3 g Vertical acceleration 0.15 g Degree of Contamination III Ice coating thinkness ≤10 mm Wind ≤ 34 m/s Rated voltage 550 kV Rated current 3150, 4000 A Rated frequency 50 Hz Rated lightning impulse withstand voltage kV For CB (to earth/between breaks ) 1550/1550+450 kV For DS (to earth/between breaks ) 1550/1550+450 kV Rated switching impulse withstand voltage kV For CB (to earth/between breaks ) 1175/1100+450 kV For DS (to earth/between breaks ) 1175/1100+450 kV Rated 1 min. power frequency withstand voltage kV For CB (to earth/between breaks ) 680/680+318 kV For DS (to earth/between breaks ) 680/680+318 kV Rated short-time withstand current 50; 63 (3s) kA Rated peak withstand current 125; 160 kA