Aiki da Kafa Mai Tsokaci na H-Klasen Tansifoma Suwa

Kuna fi nuna wannan tarihin da kaiyoyin gaba aiki na kariya da safe overload, wani tambaya ta gudan yanzu cikin koko na inggantun da masu amfani da aikin gida: yaya yawa kariya zasu iya gudan ba tare da kariya ta fuskanta insulation? Don H-class dry-type transformers, amsar ya kashe a fahimtar thermal buffer na 40°C wanda aka samu ne domin amfani da Class C (220°C) NOMEX® paper don kariya na farko a cikin H-class (180°C) insulation system. Wannan haɗa abu mai kyau ya ba mu kariya mai yawa na dry-type transformer wanda ke safe da yake da amfani—idanku kada ka fahimci kariya. Alal misali, statistics sun nuna cewa kariya na winding insulation ta faru ne a matsayin 30% na kariya na transformers, wanda ke nufi cewa thermal management ke yawa babba daga kariya daban-daban don safe operation. Wannan shirye-shirye ya bayyana kamar yadda H-class insulation systems da forced air cooling zasu iya kawo kariya mai yawa na dry-type transformer baki ba tare da kariya na service life.

2.1 Farko na Dua na Kammalai na Tsanin Tashin

Kashe ta amfani da kammalai na tsanin tashin na transformer mai saukar da abinci (dry-type) shi ne kashe na kammalai na tsanin tashin. Transformer mai saukar da abinci na H-class an saba suna da tsanin tashin na 180°C. Amma idan kammalai na tsanin tashin na transformer ya yi amfani da NOMEX® paper—a Class C material da aka saba suya da tsanin tashin na 220°C—transformer zai samu farko na tsanin tashin da yawa wanda ke cikin 40°C.

Wannan yana nufin: Idan transformer mai saukar da abinci ya faru a lokacin da ya dace da tsanin tashin, tsanin tashin na kammalai zai ci gaba. Farko na 40°C ne daga tsanin tashin na H-class (180°C) zuwa tsanin tashin na NOMEX® (220°C), wanda ke baka farko da yawa don dacewa da tsanin tashin a lokacin da transformer ya dace da tsanin tashin ba a lokacin da ya dace da tsanin tashin ba. A matsayin da suka gabata, transformer na F-class (da tsanin tashin na 155°C) ba su da wannan farko na tsanin tashin, wanda ke sauya su da yawa a lokacin da transformer ya dace da tsanin tashin.

2.2 Kammalai na NOMEX®

NOMEX® paper yana da wasu alama wanda suka taimaka don dacewa da tsanin tashin na transformer mai saukar da abinci:

• Dorewar Zafi: Yana riƙe da kashi 95% na kaddarorin lantarki a 220 °C

• Ƙarfin Ƙarfi na Maki: Yana tsayayya da damuwa na thermo-mechanical a lokacin hawan keke

• Rashin ruwa: Yana riƙe da ƙarfin wutar lantarki 90% a 95% na zafi mai zafi

• Ƙarƙashin kai tsaye: Ba ya fitar da iskar gas mai guba ko mai lalata a cikin matsanancin yanayi

Waɗannan kaddarorin suna sa masu canzawa na aji H masu bushe tare da NOMEX® rufi musamman dace da aikace-aikace inda ake tsammanin abubuwan da suka faru na wuce gona da iri, kamar asibitoci, cibiyoyin bayanai, da wuraren masana'antu.

2.3 Ginin da ke da iska

Masu canzawa na H-class na busassun nau'in suna da fasalin buɗe iska (OVDT) tare da hanyoyin iska da ba a rufe su ba da kuma ƙananan rufin rufi. Wannan ginin yana hana tarawar zafimafi mahimmancin fa'ida akan masu canzawar resin epoxy lokacin amfani da ƙarfin ƙarfin mai canzawa mai bushe.

3.1 Kula ta Gaba ta Zaman Lahi (AN)

A cikin halin kula ta gaba ta zaman lahi (AN), mafayi na dry-type na H-class zasu iya samun kari a matsayin 20% don hanyar yanzu, idan karamin samun kari na baya shine 80% ko ƙasa.

Matsayin kula: Don H-class insulation, karamin kula na gaba na winding shine 125K a cikin 40°C na zaman lahi.

3.2 Kula ta Gaba ta Zaman Lahi (AF) — Wani Abin Da Ya Zama Mai Tsoro

Kula ta gaba ta zaman lahi (AF) shine babbar abin da ke taimaka wajen samun kari na dry-type transformer a matsayin mai amfani. Daga nuna zaman lahi mai rufe a cikin core da windings, kula ta AF zai iya:

• Za ta saita samun kari ta 15-33% a matsayin mai amfani

• Za ta taimaka samun kari na 130% a matsayin mai amfani don H-class transformers

• Za ta taimaka kula na coil a 45-55°C a cikin halin da suka dace

Kammalai mai mahimmanci: Yadda AF cooling yana ba da damar ƙarfi na transformer na dry-type a cikin karamin gaba, yana daidai a amfani da shi ne kamar hanyar wani abu na lokaci ba tare da wani abu na daga cikin lokacin da aka yi amfani da shi. Transformer ya kamata a ƙayyade a cikin AN cooling capacity, wanda fans su ba da damar ƙarfi na karamin gaba a lokacin da aka fi yin amfani da shi.

3.3 Kammalai na gida

Wani kammalai na CFD na transformer na dry-type na H-class na 10 kVA ya nuna yadda zai iya amfani da overload a cikin karamin gaba. Al'ummar da aka yi an yi 32 simulashe na steady-state da yawa na load da conditions na ambient don fahimci karamin gaba na insulation, kuma 9 simulashe na transient don tabbatar da lokacin da za ta faru a lokacin da aka yi overload. Bayanin da aka samu sun nuna cewa hot spot temperatures a lokacin da aka yi overload zai iya tabbatarwa, wanda zai iya taimaka wajen fahimci lokacin da ke cikin karamin gaba.

4.1 Alama na warning mai mahimmanci

• Yadda hot spot temperature ya ci gaba yanzu 155°C zai bukatar yin karamin load

• Tsawon ƙarfi na yaki mai zama 40°C yana kara karamin ƙarfi na yaki da ke bayan

• Karamin ruwa a cikin yaki mai zama 95% yana kara tsawon ƙarfi na yaki

• Tsawon harmonics daga mafarkin yakin gaba daya yana kara ƙarfi

4.2 Tsawon ƙarfi na yaki

Yaki mai zama yana kara tsawon ƙarfi na yaki na karamin ƙarfi, wanda yana kara karamin ƙarfi na yaki da karamin ƙarfi na yaki. Ruwa yana kara karamin ƙarfi na yaki na karamin NOMEX® paper, wanda yana nufin cewa amfani da transformer mai yaki ba suka yi amfani da yaki a lokacin da ruwa yana yawa

4.3 Idan ba za a yi yaki ba

• Yaki mai zama ta hanyar yaki mai zama wanda yana kara ƙarfi

• Babu karamin yaki a cikin yakin yaki

• Tsawon ba suka yi amfani da yaki wanda yana kara tsawon harmonics

• Babu karamin yaki a cikin yakin yaki wanda yana kara tsawon yaki

5.1 Ka'idojin Zaɓin

• Kula da nauyin kaya a 60-80% don kiyaye iyakar wuce haddi

• Zabi tilasta iska sanyaya ga aikace-aikace da m ganiya kaya

• Zaɓi rufin aji na H lokacin da zafin jiki na yanayi ya wuce 40 °C ko lokacin da kayan aiki ke cikin rufi, wuraren da ba a samun iska sosai

• Yi la'akari da NOMEX® rufi don aikace-aikacen wuta-mai mahimmanci kamar su tashoshin karkashin kasa da wuraren ajiyar makamashi

5.2 Saitunan aiki

saratu na ƙarfi na 5.3

• Kawo kariya na fannin yadda ake bukata; kuma dust zai iya gyara airflow da 80%

• Tabbata ku aiki na fan yayi kafin yadda ake bukata sosai

• Muna baya kariya na fannin bayan aiki mai yawa

• Tunani shirin gida kuma raba yadda ake bukata sosai

Wani ne kammalim kammalin yadda zai iya gudan kuma dukkali na H-class?

A lokacin da aka saita harka ta fadada, dukkali na H-class zai iya gudan 130% na kammalin yadda ake amfani da su da kafin lokaci. A lokacin da aka saita harka ta fadada, zai iya gudan 20% kuma a lokacin da ke cikin 2 saati, idan kammalin yadda ake amfani da su ya kasance 80% ko kara.

Yadda zai iya gudan kammalin yadda ake amfani da dukkali na harka ta fadada?

Harka ta fadada zai iya gudan kammalin yadda ake amfani da dukkali na 15-33% kuma a lokacin da aka saita harka ta fadada, dukkali na 1000 kVA zai iya gudan 1150-1330 kVA.

Yadda yanzu na gida ta fuskanci gudan kammalin yadda ake amfani da dukkali?

Ko wani daraja na 1°C da ke cikin 40°C na gida, kammalin yadda ake amfani da su zai kasance 0.5-1%. A lokacin da yanzu na gida ya kasance 45°C, za a amfani da dukkali a 95% na kammalin yadda; idan yanzu na gida ya kasance 50°C ko kara, harka ta fadada ko karamin yadda ake amfani da su zai bukatar shi.

Shin ya zai NOMEX insulation iya ba da kariyar yadda wani insulation na H-class?

Ee. NOMEX® paper shine Class C material wanda aka raba shi don 220°C, amma H-class system shine aka raba shi don 180°C. Wannan kariya na 40°C na yadda yana bada kariya mai sauƙi a lokacin yadda yake aiki, kuma yana nufin cewa transformers da NOMEX insulation suna da kariya don yadda yake aiki.

Yaya za a sanya yadda don kariya mai sauƙi?

Suna da kariya: fans su biyo a 100°C, fans su kare a 80°C, alarm a 130°C, kuma trip a 150°C. Wadannan sanyawa suna tabbatawa cewa transformer yana aiki a cikin H-class 180°C kariya ta farko kuma yana da kariya mai sauƙi.

Shin forced air cooling yana da alaƙa don aiki da kariya a lokacin da ke dauka?

Ba. Forced air cooling shine yana da alaƙa don aiki ne a lokacin da ke dauka. A lokacin da ke dauka, AF yana zama aiki da kariya kuma yana taka kudin fans da kudin kariya. Amma idan fan cooling yana taka kariya don dry-type transformer, transformer shine yana da kariya don aiki a cikin AN natural cooling capacity.

Yaya ya zama mai tasiri gaba daya na harmonic a kwararri na transformer mai saukin kuma yana ƙarƙashin kwararri?

Harmonics suna zama mai haɗawa da ƙarƙashin ƙarfi a cikin windings na transformer da kuma a cikin core. Total harmonic distortion (THD(i)) ta ƙarƙashin kwararri na transformer da kuma ta rage kwararri na overload. Don hanyoyin da suka yi amfani da variable frequency drives ko wani abu na musamman da ba shi da linear ba, ana so a amfani da H-class insulation.

Yaya ya zama kwararri na ventilation clearance don amfani da transformer mai saukin kuma don kuma kwararri?

Alamarin masu amfani da industry suna so a sanya ƙarƙashin 3 feet (0.9m) a cikin kwanaki na transformer da kuma 12 inches (0.3m) a dukkan kariya na farko. Ventilation openings suka biyu da kwararri na transformer—misali, transformer na 750-1500 kVA yana bukatar 300 sq. inches na intake da exhaust area.

H-class dry-type transformers da su amfani da NOMEX® insulation sun ba da mafi kyawawan kudin yin overload a cikin dry-type transformers saboda 40°C thermal margin ne daga insulation system rating zuwa actual material limit. Idan kuma za a iya saita output ta hanyar forced air cooling akan 15-33%, amma ya kamata a yi amfani da shi don temporary peak-load strategy ba don permanent solution ba. Safe dry-type transformer overload operation yana bukatar fahimtar specific limits na installation na ku—daga wadanda suka hada da ambient temperature, ventilation conditions, da load characteristics—kuma a gano appropriate thermal protection settings.

Thermal redundancy ne da aka saba a cikin H-class NOMEX® systems shine yana da condition da ya iya lissafi ba yana da kariya ba. Fasahar wadannan boundaries zai iya taimaka operators su ci gaba da emergency supply potential na su transformers domin kula da insulation life da kuma tabbatar da reliable service akan many years to come.