High Voltage Electrical Switchgear

Type: Gas-Insulated Metal-Enclosed Ring Main Unit (RMU) Model: XGN15-24 Params: I. Rated Electrical Parameters Rated Voltage: 24kV Rated Frequency: 50Hz Rated Current: 630A, 1250A Rated Short-time Withstand Current (4s): 20kA, 25kA Rated Peak Withstand Current: 50kA, 63kA Rated Short-circuit Breaking Current: 20kA, 25kA Rated Short-circuit Making Current: 50kA, 63kA Short-time Withstand Current of Earthing Switch: 20kA/4s II. Insulation & Gas Parameters Insulating Medium: Sulfur Hexafluoride (SF₆) gas Rated Filling Pressure (20℃): 0.04～0.06MPa (gauge pressure) Minimum Operating Pressure: 0.02MPa Annual Gas Leakage Rate: ≤0.5% Power Frequency Withstand Voltage (Phase-to-Earth / Phase-to-Phase): 65kV/1min Lightning Impulse Withstand Voltage (Peak Value): 125kV III. Mechanical Parameters Mechanical Operating Life Load Switch: ≥5,000 operations Earthing Switch: ≥2,000 operations Operating Mode: Manual spring operation, electric operation (optional) Protection Degree Inside Gas Tank: IP67 Outside Cabinet: IP34D IV. Service Environmental Conditions Ambient Temperature: -25℃ ～ +40℃ Altitude: ≤2000m (Customized version required for higher altitude) Relative Humidity: Daily average ≤95%, monthly average ≤90% Installation Location: Indoor installation, free of flammable, explosive and corrosive gases Material: Cabinet frame and outer enclosure: Galvalume steel sheet or hot-dip galvanized steel sheet. Sealed gas tank: Fully welded 304 stainless steel plate for storing SF6 insulating gas. Conductive busbars and contacts: T2 pure copper with silver or tin plating on contact surfaces. Insulating supports and bushings: Epoxy resin and SMC unsaturated polyester composite. Sealing elements: Nitrile rubber and silicone rubber sealing rings to avoid gas leakage. Fasteners: Stainless steel bolts, spring washers and flat washers. Arc-extinguishing and insulating medium: Sulfur Hexafluoride (SF₆) gas. Applicable Industry: The product is widely used in urban power grid construction and renovation projects. It is suitable for ring main power supply and terminal distribution systems, and can also be installed in prefabricated substations and switching stations. It features a fully enclosed, maintenance-free design with compact structure and high reliability.