Secondary switchgear EVI-12

insulatedmedium-voltagehigh-voltage

Overview The newly developed EVI Air Insulated Switchgear is designed upon newly introduced technologies and computer-aided simulation. The modular design gives the flexibility. It fulfills technical reqiurements of both network nodes and terminal users, and the needs about flexibility concerning all secondary substations. Description All live parts and mechanisms are sealed in a stainless steel enclosure filled with dry air, thus makes it not easily being affected by external conditions,  the operation reliability and safety can be ensured. The dielectric material is eco-friendly, and has a good environmental adaptability. Common-cased structure is used. Complete primary programs can fully meet a variety of wiring requirements. • Development Background  Greenhouse Effect and Gas Emission Cost  SF6 gas as one of the six greenhouse gasses is 23,000 times stronger than CO2. The emissions of SF6 are unavoidable during the whole handling processes of MV switchgears from production till the final disposal. It has caused public attention to environment due to the increased use of SF6 gas in MV switchgears. Users from industries and utility companies may also face increased cost as some policies launched to include SF6 into greenhouse gas emissions category. China National Development and Reform Commission has already published the calculation formula for emissions of SF6 together with CO2 consumption for power grid companies. The formula is E=ESF6+E lost. Price will be charged for emitted volumes during repairing and switchgear disposal.