75kV/126kV Gas-insulated Metal-enclosed Switchgear

Features: 1) Epoch-making compact: volume contracted GIS is merely 40% of common deflection phase type GIS 2) Minimum volume, light weight and earthquake resistant: it is the product of minimum volume among similar domestic GIS compartment units, standard compartment width is only 1.2 to 1.5m; casing and conductor adopt aluminum alloy material, which features corrosion resistant, light weight and good earthquake resistant performance, standard compartment weight is about 2 to 4MT 3) Strong breaking capacity: circuit breaker adopts self-energy arc extinction principle, has very high short circuit breaking and closing capacity, charging current of breaking and closing circuit has no re-strike and re-arcing phenomena, electric life reaches 16 times; isolating switch could meet the requirement of closing bus transfer current and bus charging current; earth switch could meet the requirement of closing short circuit current and closing induction current 4) No dangerous switching over voltage: due to special performance of SF6 gas to small current arc, switching over voltage may be suppressed to the minimum; when cut off charging current of overhead line or cable, neither re-acing nor dissociation will be generated; when cut off excitation current of transformer, observed max. over voltage multiple will not exceed 2.5pu 5) High insulation level: the product has rationally designed insulation structure, all insulating parts used have passed strict quality inspection; overall withstand voltage level exceeds international and IEC standard requirement; insulation is stable and reliable; repair cycle of current carrying main circuit is relatively long;6) High safety and reliability, easy maintenance and repair, low noise, short installation period and safe without fire. Rated voltage 126kV Rated frequency 50Hz Rated current 1250,1600,2000A Rated short time withstand current/duration 40kA/4s Rated peak withstand current 100kA Rated short time power frequency withstand voltage To earth:230kV Between fractures: 230+73kV Phase to phase: 230+115kV Rated lightning impulse withstand voltage To earth: 550kV Between fractures: 550+103kV SF6 gas pressure (20) rated value /alarm value/locking value Circuit breaker compartment: 0.6/0.55/0.5MPa SF6 gas pressure (20) rated value/ alarm value Other compartment: 0.5/0.4MPa SF6 gas water content (volume ratio) Control value/ permissible value Circuit breaker compartment: 150/300ppm Other compartment: <250/500ppm Yearly leakage rate of SF6 gas ≤1% Control circuit and auxiliary circuit voltage DC110 or 220V, Ac220 or 380V