Gwamnati da Sunan Yadda a Zama na Ƙididdiga masu SF₆ Ring Main Units
1 Ga abụọ SF₆ Ring Main Units
1.1 Ọdịnala Ring Main Units
Ring main units (RMUs) nwere obere gas, obere ike ọrụ, obere cable, ma ọ bụ obere busbar connection (e nwere ni ọtụtụ).
Obere gas na-echekwa site n'akụkụ ma ọ bụ isi n'otu dị ka ọ bụla nwere ike ịkpata onye. Obere ike ọrụ, cable, ma ọ bụ busbar connection na-echekwa site n'akụkụ, enyere ọrụ switch, installation cable, ma ọ bụ wall mounting n'ụzọ zuru oke, e sihụrụ ọrụ ma ọ bụ maintenance space.
1.2 Obere Gas ma Ụlọ Ihe Nke Isi
Obere gas nwere ike ịbụ epoxy resin ma ọ bụ stainless steel. Epoxy-resin cast chambers na-enye airtightness kwesịrị na production ma ọ na-akpali IP67 protection, mgbe stainless steel chambers na-egosi airtightness dị elu maka welding variations site n'etiti ma ọ bụ batches.
Load switch disconnectors na-eme ihe n'ụzọ dị iche iche: RM6 ma ọ bụ M24 RMUs na-eme double-break disconnectors, na-enweghị arc extinguishing demands per break ma ọ na-enyere voltage withstand capability. GA, GE, ma ọ bụ GAE RMUs na-eme single-break disconnectors na contact gaps kachasị (50mm) ma ọ na-eme two specialized rivets site n'ụlọ ihe nke isi ịgbakwunye ịkwara during arc suppression ma ọ bụ short-circuit conditions, na-enye stable contact resistance gburugburu their service life.
Busbar designs na-eme ihe n'ụzọ dị iche iche maka cabinet structure ma ọ bụ connection methods, mgbe managing electric/magnetic field effects site n'feeder units na-enwe ọtụtụ.
1.3 Product Lineup
Manufacturers na-ekwu functional units maka ịnye ọtụtụ user needs: dual-power transfer cabinets, busbar section cabinets, cable incoming cabinets, etc., na-eme ihe n'ụzọ outdoor ring networks ma ọ bụ indoor substations.
2 Existing Issues
(1) Nsogbu ọhụrụ imported SF₆ RMUs na-enye ọtụtụ user acceptance.
(2) Compact design na-enye busbar spacing ma ọ bụ contact gaps versus air-insulated switches. Standby feeder circuits nwere ike ịnwe voltage maka fields site n'live busbars; grounding dị mkpa. Ọtụtụ users na-enye switches open maka standby cable installation, ma manuals na-enweghị ịghọta this risk, na-enye accident potential.
(3) Poor environmental adaptability insulated/sealed RMUs na-egosi heaters maka ịkwalite moisture/condensation.
(4) Overly complex mechanisms; simplification dị mkpa maka reliability (e.g., switch-fuse units).
(5) Cumbersome installation/reconfiguration: Complex cabinet/cable setup ma ọ bụ retrofitting na-enye error risks maka utility/user technicians.
(6) Persistent use of two-position switches.
(7) Nsogbu ọhụrụ maka voltage signal/control power extraction site n'incoming cabinets.
3 Improvement Measures
3.1 Localizing Imported Products
3.1.1 Full Localization
Ọtụtụ suppliers na-enye entire cabinets domestically (gas chambers to sheet metal) maka local processes/parts.
3.1.2 Partial Localization
Ọtụtụ importers na-ewepụta gas chambers/core parts abroad ma ọ na-localize sheet metal/accessories. Ọ na-enye quality (imported chambers, HRC fuses, voltage indicators, self-powered protection devices) maka cutting costs via local auxiliary parts. Schneider ma ọ bụ F&G na-enye cost-performance balance.
3.2 Enhanced Technical Support
Strong technical support na-enye user trust. Expertise na-enwe ịmata maka power systems/engineering beyond product knowledge. Effective solutions (e.g., custom development, troubleshooting) na-enye ọtụtụ users economically.
