Yadda Tattalin Tech Take Mika SF6 a Ring Main Units na Yanzu

Anfani na ring main (RMU) suna amfani da su a tattalin arziki na takardun gaba, tun daga haka za su kofin zuwa masu amfani kamar jama'a, makarantun kayan adawa, gwamnati, hanyoyi, da sauransu.

A cikin substation na jama'a, RMU yana bayyana shugaban 12 kV, wanda ya zama 380 V ne a kan transformers. Anfani na low-voltage switchgear ke tattara energy mai tsawon kasa zuwa masu amfani. Don transformer na 1250 kVA a cikin jama'a, RMU na medium-voltage yana da muhimmanci ga konfigurashin na biyu na incoming feeders da kuma one outgoing feeder, ko biyu na incoming feeders da multiple outgoing feeders, har zuwa transformer. Don transformer na 1250 kVA, current na 12 kV ring main unit side shine 60 A. Ana amfani da fused switchgear combination unit (FR unit), wanda ya samu load break switch da fuse. Ana amfani da 100 A fuse, inda load break switch yake kontrola energizing ko de-energizing ta transformer, kuma fuse na short-circuit protection don transformer. Transformer na 1250 kVA yana bayyana 380 V low-voltage current na 2500 A, wanda an tattara ta a kan standardized low-voltage switchgear daga State Grid.

RMU na SF6 gas-insulated suna da sassan kudin, kuma common-tank design ce shine mafi kyau da take da abubuwan ruwa. Tabbataccen insulation da arc-quenching properties na SF6 gas, load break switches a cikin switchgear suna amfani da SF6 gas don arc extinction, wanda suke iya kawo isolation da active load currents karkashin 630 A.

Don RMU na environmentally friendly gas-insulated, saboda ba a bannace alternative eco-friendly gas wanda ya fi shi da SF6 a matsayin insulation da arc-quenching performance, kuma saboda disconnectors ba su iya kawo load current, ana amfani da disconnector da vacuum load break switch don ci gaba da abin da aka bukaci don fadada switch.

Safin na farko a cikin wannan figure ya nuna primary circuit scheme na conventional SF6 RMU, kuma safin na na'ura ya nuna primary circuit scheme na environmentally friendly gas-insulated RMU.

Yana iya samun cewa don F-type cabinet na ring-in da ring-out load break switches, isolation plus vacuum switch ita ce da ke bukaci; don FR cabinet na transformer outgoing, isolation plus vacuum switch plus fuse ita ce da ke bukaci, wanda ya yi switching configuration to be more complex.

Electrical parameters na ring main unit load break switch shine:
• Rated current: 630 A
• Rated short-time withstand current: 20/4 (25/4*) kA/4 s
• Rated short-circuit closing current: 50 (63*) kA
• Mechanical endurance of load break switch: Class M1, 5000 operations
• Mechanical endurance of earthing switch: Class M1, 3000 operations
• Electrical endurance of load break switch: Class E3, 200 operations

Saboda haka, Schneider ta fito parallel vacuum arc-extinguishing method, wanda ya mean installing a vacuum interrupter in parallel within the switch. A cikin opening process, moving contact linkage na vacuum interrupter yana da synchronous drive, wanda ya kawo arc into the vacuum interrupter where it is extinguished.

Ba a bangaren arc extinction, contacts na vacuum interrupter yana zo zuwa closed position, kuma a cikin subsequent closing operation na switch, vacuum interrupter ba suka actuate.

Wannan design ya bukaci da operating mechanism mafi so, kuma saboda two separate structures na disconnector da vacuum switch, wanda ya haɗa da sassan kudin da cost. Amma, kuma saboda two independent switches, parallel switching mechanism yana buƙatar muhimmanci ga design, manufacturing process, da reliability don ensure accurate switch operation.

Wannan type na parallel vacuum interrupter load break switch yana da structural forms mafi so, amma underlying principle ce ta daidai.

Miniaturized vacuum interrupter yana da integration with the main switch contacts, wanda yana da muhimmanci don interrupt small currents karkashin 630 A.

A cikin "Dual Carbon" goals, environmentally friendly gas-insulated switchgear shine trend da ya fi shi da. Saboda ba a bannace technological advancement, simply piling components yana haɗa da material da resource consumption mafi yawa, losses mafi yawa, kuma yana haɓaka sustainable development. A cikin research na new alternative gases da arc-quenching methods, pursuing solutions that simplify mechanisms, enable easier operation, and improve reliability shine viable path forward for advanced equipment manufacturers and products. Customers suke da shawarar zaɓe technologically advanced alternative products don help achieve the Dual Carbon goals sooner.