Menene amfanin masu canji tare da ƙungiyoyin haɗin D/Y?

A cikin wani transformer mai kashi uku, daya gefen farko ko na biyu na winding koyaushe ana haɗa shi a cikin tsarin delta. Wannan don guje wa kasancewar abubuwa na uku na harmonic a cikin babban magnetic flux, don haka rage eddy currents da dumama gida, da kuma inganta aikin transformer da amincinsa. Don fahimtar ka’idar, muna buƙatar fara fahimtar tushen tushen transformers masu kashi uku.

1. Akwai nau’ikan transformers masu kashi uku guda biyu:

Ɗayan shine nau’in rukuni na transformer mai kashi uku (Hoto 1):

Ɗayan kuma shine nau’in core na transformer mai kashi uku (Hoto 2):

Nau’in rukuni na transformer mai kashi uku ya ƙunshi transformers guda uku masu kashi ɗaya da aka haɗa ta hanyar windings don samar da transformer mai kashi uku. Halinsa shine cewa da’irori na lantarki na kashi uku suna da ‘yanci, kuma flux na uku harmonic na iya gudana. Manyan transformers masu kashi uku ba safai suke amfani da wannan nau’in rukuni ba, don haka ba za a ƙara tattauna shi ba.

Manyan transformers na wuta yawanci nau’in core na transformer mai kashi uku ne. Halinsu shine cewa da’irori na magnetic na kashi uku suna haɗuwa. Ga da’irar magnetic na iron core mai kashi uku, babu wata hanya kai tsaye don flux na uku harmonic. Don haka, flux na uku harmonic yana iya yin madauki ne kawai ta hanyar da’irar magnetic na zubarwa, kamar akwatin transformer. Akwatin transformer yawanci ana yin shi da faranti na karfe, kuma kasancewar flux na uku harmonic zai haifar da dumama mai tsanani.

Hanyar da’irar magnetic na uku harmonic a cikin nau’in core na transformer mai kashi uku (Hoto 3)

2. Siffofin igiyoyin wutar lantarki (potenshiyal), halin yanzu na motsawa, da magnetic flux a ƙarƙashin tsarin da’irar magnetic da da’irar lantarki daban-daban.

2.1 Halin yanzu na motsawa na sinusoidal yana haifar da magnetic flux mai lebur (Hoto 4).

Lokacin da core ya cika: lokacin da magnetic flux ya kasance igiyar lebur, halin yanzu na magnetizing shine igiyar sine.

2.2 Halin yanzu na motsawa mai tsayi yana haifar da magnetic flux na sinusoidal (Hoto 5).

Siffar halin yanzu na motsawa ba tare da kaya ba.

2.3 Dukansu igiyoyin lebur da tsayi ana iya rarraba su zuwa igiyar asali da na uku harmonic (Hoto 6).

Siffar ƙarfin lantarki na motsawa ba tare da kaya ba na transformer mai kashi uku. Lokacin da da’irar magnetic ta cika, don samun magnetic flux na sinusoidal, halin yanzu na motsawa ya kamata ya zama igiyar tsayi.

Lokacin da da’irar magnetic ta cika, idan halin yanzu na motsawa shine igiyar sine, babban magnetic flux shine igiyar lebur.

3. Bayan fahimtar ilimin asali na sama, yanzu za mu ci gaba da bincike. Idan duka bangarorin farko da na biyu suna haɗe da Y, babu wata hanya don na uku harmonic na halin yanzu. Don haka, a cikin haɗin Y/Y, halin yanzu na motsawa zai iya zama halin yanzu na sinusoidal kawai. Wannan halin yanzu na motsawa na sinusoidal zai iya haifar da magnetic flux na lebur kawai, wanda za a iya rarraba shi zuwa flux na asali da flux na uku harmonic.

Waɗannan fluxes na uku harmonic a cikin babban filin magnetic suna daidai da girma da lokaci. Ba za su iya rufewa ta cikin core ba kuma suna iya yin madauki ne kawai a cikin da’irar magnetic na zubarwa, kamar a cikin mai, bangon tanki, da yoke, suna haifar da eddy currents, suna haifar da dumama gida, da rage aikin transformer.

Don haka, manyan transformers masu kashi uku masu ƙarfi da babban ƙarfin lantarki ba su dace da haɗin Y/Y ba.

Sabanin haka, lokacin da windings aka haɗa a cikin tsarin delta/Y ko Y/Δ, ana samar da hanyar madauki don na uku harmonic na halin yanzu na motsawa a cikin haɗin delta a gefen farko ko na biyu. Don haka, halin yanzu na motsawa a cikin winding mai haɗin delta shine igiyar tsayi. Halin yanzu mai tsayi yana kiyaye babban magnetic flux na sinusoidal ba tare da wani na uku harmonic ba.

Musamman lokacin da windings aka haɗa a cikin tsarin Y/Δ, ko da yake na uku harmonic a cikin halin yanzu na motsawa na gefen farko ba zai iya wucewa ba, ana samar da halin yanzu na zagaye na uku harmonic a cikin haɗin delta na gefen biyu. Wannan halin yanzu na zagaye, tare da halin yanzu na motsawa na sinusoidal a gefen farko, yana tabbatar da cewa babban magnetic flux na sinusoidal ne, don haka yana guje wa dumama gida da ke haifar da eddy currents na uku harmonic.

A taƙaice, windings na farko ko na biyu na transformer mai kashi uku ana haɗa su a cikin tsarin delta don tabbatar da cewa babban magnetic flux ya kasance kusa da igiyar sinusoidal gwargwadon yiwuwa, yana guje wa eddy currents da matsalolin dumama da ke haifar da na uku harmonics, don haka inganta aikin transformer da amincinsa.