Yuav ua li cas ntsuas ct polarity nrog multimeter
Yuav ua li cas ntsuas ct polarity nrog multimeter
Tam sim no transformer, CT: Electromagnetic tam sim no transformer yog dav siv nyob rau hauv lub hwj chim system, thiab nws txoj kev ua hauj lwm zoo ib yam li cov transformer.
Cov yam ntxwv ntawm tam sim no transformer yog raws li nram no: (1) Thawj kauj yog txuas nyob rau hauv series nyob rau hauv lub Circuit Court nrog ob peb lem, yog li tam sim no nyob rau hauv lub thawj kauj yog nyob ntawm tag nrho cov load tam sim no ntawm Circuit Court yuav tsum tau kuaj, tab sis tsis muaj dab tsi rau. ua nrog rau theem nrab tam sim no; (2) Lub impedance ntawm lub kauj tam sim no ntawm lub twj paj nruag thiab relay txuas nrog lub kauj thib ob ntawm lub transformer tam sim no yog me me, yog li nyob rau hauv ib txwm muaj xwm txheej, tam sim no transformer khiav nyob rau hauv lub luv luv-circuit xeev.
Qhov piv ntawm thawj thiab theem nrab ntsuas tam sim no ntawm tam sim no transformer yog hu ua qhov sib nrig sib inductance piv ntawm tam sim no transformer: kn=I1n/I2n.
Vim tias qhov ntsuas tam sim no I1n ntawm lub hauv paus kauj tau raug tus qauv thiab qhov ntsuas tam sim no I2n ntawm lub kauj thib ob yog sib koom ua ke rau 5 (1 lossis 0.5) A, qhov ntsuas kev sib nrig sib inductance ntawm lub tam sim no transformer kuj tau. txheem. Kn tseem tuaj yeem hais kwv yees li qhov sib piv ntawm thawj thiab theem nrab windings ntawm lub transformer, uas yog, qhov twg kn≈kN=N1/N2 yog tus naj npawb ntawm cov lem ntawm thawj thiab theem nrab windings.
Lub luag haujlwm ntawm tam sim no transformer yog ntsuas qhov tam sim no loj.
Feem ntau hais lus, yog tias koj xav ntsuas qhov tam sim no ntawm 400A, koj yuav ua li cas yam tsis muaj 400A watt-teev meter? Yog li ntawd, koj yuav tsum siv lub tam sim no transformer los hloov lub tam sim no loj rau hauv ib tug me me tam sim no thiab muab tso rau hauv lub watt-teev meter. Lub transformer muaj qhov sib txawv, piv txwv li, 200/5 yog 40 npaug ntawm watt-teev meter, uas txhais tau hais tias koj lub watt-teev meter tau raug them ib zaug. Qhov tseeb, koj tau siv 40 degrees ntawm hluav taws xob, thiab muaj ntau theem ntawm transformers, nrog 15/5.
Rau thaj chaw, txoj hauv kev zoo tshaj plaws los txiav txim siab qhov polarity ntawm lub transformer yog siv lub roj teeb qhuav thiab ib daim ntawm pointer multimeter MF47. Nrog cov xov hlau, nws yog qhov ncaj tshaj plaws thiab pom tau yooj yim, thiab qhov tseeb tuaj yeem ncav cuag ntau dua 90 feem pua. Txoj kev no yooj yim heev. Tus txheej txheem theem nrab transformer nrog P1 P2 nyob rau hauv thawj sab yog S1S2 K1K2, thiab lwm yam. Txuas lub zoo electrode nyob rau theem nrab ntawm P1 mus rau qhov tsis zoo electrode ntawm S1, thiab cov theem nrab yog txuas ncaj qha. Tom qab ntawd ncaj qha luv luv ntawm DC tam sim no mus rau thawj sab ntawm lub transformer nrog lub roj teeb. Nyob rau lub sijhawm no, koj yuav pom tias yog lub pointer viav vias ntawm lub multimeter yog qhov zoo tshaj clockwise, nws yog qhov tsis zoo counterclockwise, qhia tau hais tias lub sab hauv winding yog tsis ncaj ncees lawm. Lub sijhawm no, koj yuav tsum saib xyuas nws kom meej. Vim tias qhov taw tes lub viav vias tsis loj, nws raug nquahu kom siv ob lub roj teeb 1 # tib yam, vim tias nws yog qhov txaus ntshai heev uas muaj roj teeb ntau dhau lawm, thiab nres rau ib nrab teev lossis hloov cov roj teeb tom qab kwv yees li 10 qhov kev sim. Vim tias lub roj teeb kub heev thaum lub sijhawm kuaj, nws tau qhia tias koj yuav tsum tsis txhob tub nkeeg siv 126V hloov pauv los ntawm kev hloov tam sim no vim tias koj txuag lub roj teeb, tab sis qhov yuam kev nce ntxiv thiab kev nyab xeeb txo.
