Unsa ang kasamtangan nga status sa aplikasyon ug yutang sa pag-ukoy sa medium-voltage switchgear?
Tungod sa pagpasabot sa automatikong proseso sa mga gamit sa kuryente, adunay daghan na nagsilabing mga switchgear sa medium-voltage nga nagpakita sa merkado. Hinumdumi an insulasyon media, sila gigrupahan sa air-insulated, SF₆ gas-insulated ug solid-insulated, bawgad may personal nga mga advantage ug disadvantage: ang solid insulation may maayo nga performance apan dili eco-friendly, ang SF₆ may maayo nga capability sa pagpahinabang sa arc apan usa ka greenhouse gas, ug ang air insulation may mataas nga cost-performance apan mas dako ang volume. Ang mga kompanya gikinahanglan og comprehensive selection aron mapataas ang application efficiency.
Development Characteristics
Human sa usa ka siglo sa development, ang medium-voltage switchgear may matam-is nga technical standard system. Ang demand sa mga user mibag-o gikan sa basic functions/parameters hangtod sa high reliability ug low operation cost; ang standard-setting mas focus sa continuity ug safety sa operation; ang primary/secondary equipment may clear division of labor ug diversified product structures; ang digital ug online detection technologies mopromote sa intelligence, pababaha sa operation costs.
Current Development Status
Air-insulated Switchgear
Ginagamit ang hangin isip insulasyon media, kasama ang ring main units ug metal-clad withdrawable switchgear, safe ug eco-friendly. Ang metal-clad equipment may large capacity suitable sa high-power supply scenarios, samantalang ang ring main units compact, low-cost ug easy to install, mainly applied in medium-voltage terminals. Equipped with integrated protection devices and transformers, sila makaporma og complete distribution automation system.
SF₆ Gas-insulated Switchgear
Ang SF₆ gas may excel sa arc extinguishing ug insulasyon, suitable sa medium-high voltage applications, pero regulated tungod sa iyang greenhouse effect. Ang vacuum circuit breakers (VCBs) limited sa ≤35kV tungod sa insulation constraints, kini ang SF₆ equipment remains essential para sa mas taas nga voltages. Solutions include using gas mixtures para makabawas sa SF₆ consumption ug improving leakage prevention/recycling technologies.
Solid-insulated Switchgear
Fully-sealed epoxy resin casting, pollution-proof ug altitude-independent, applicable sa ≤35kV systems. Apan, ang high cost, heat dissipation challenges ug difficult epoxy degradation hinuon wide adoption. Design optimization needed para balanced sealing ug heat dissipation.
Key Technical Advances
Interruption Technology
VCBs with CuCr contacts ug longitudinal magnetic field structure enhance interruption capability. Ceramic enclosures enable miniaturization ug low-cost mass production.
Insulation Technology
Gas-insulated switchgear uses N₂/air instead of SF₆, while solid-insulated switchgear improves environmental resistance via epoxy encapsulation. Both adopt electric field simulation for reliability.
Intelligent Upgrades
Integrated sensors ug communication modules enable online condition monitoring. Digital protection devices ug electronic transformers are replacing traditional components.
Development Trends
Miniaturization ug intelligence are mainstream: miniaturized equipment reduces substation footprint by >30%, lowering land costs; intelligence improves maintenance efficiency via digital twin ug 5G technologies. Future efforts should phase out non-essential SF₆ equipment, promote vacuum/solid insulation, ug support smart grid development.
Conclusion
Vacuum switchgear currently dominates the market, while SF₆ ug solid-insulated products have low penetration. Accelerating intelligent vacuum switch applications ug solving solid insulation environmental issues will better meet the green ug intelligent needs of power systems.
