Fault Analysis thiab Diagnosis ntawm Low Voltage Distribution Lines
(1) Ib-theem hluav taws xob tsis ua haujlwm. Ib-theem tsis tuaj yeem siv hluav taws xob, thiab qhov hluav taws xob tsis tuaj yeem ntsuas nrog lub ntsuas ntsuas, thiab ob lub xov hlau ntawm theem tsis tau teeb lossis ob qho tib si tau teeb nrog lub ntsuas ntsuas: yog tias theem tawg, lub ntsuas ntsuas tsis teeb, yog Cov kab nruab nrab yog tawg, tom qab dhau los ntawm kev thauj khoom Circuit Court, 2 xov hlau Cov kab yog tag nrho cov ci. Siv tus cwj mem ntsuas hluav taws xob los ntsuas cov theem kab lossis kab nruab nrab mus rau qhov chaw kaj thiab tsaus, uas yog qhov txhaum ntawm qhov tawg.
(2) Ib qho ntawm peb theem tawg. Siv multimeter los ntsuas qhov voltage ntawm ob theem kab mus rau cov kab nruab nrab yog qhov qub, ib theem kab tsis muaj qhov hluav taws xob rau cov kab nruab nrab, qhov voltage ntawm ob kab ntawm peb theem kab yog 0. 4kV, thiab ib kab tsis muaj hluav taws xob rau lwm tus. Thaum cov xaum ntsuas ntsuas cov xaim tawg, cov xaum ntsuas theem yuav tsis teeb. Siv tus cwj mem ntsuas hluav taws xob los ntsuas cov theem tuag mus rau qhov ci ntsa iab thiab tsis muaj teeb pom kev pom qhov ua txhaum.
(3) Cov kab ib-theem theem yog grounded. Txij li thaum cov hluav taws xob qis qis tam sim no tag nrho cov tiv thaiv ntawm ntau lub tshuab hluav taws xob tsis ua haujlwm rau ntau yam laj thawj, cov kev ua txhaum no tsis tuaj yeem tshwm sim. Nws tsis yog qhov hnyav heev ib-theem grounding, nws yog ib txwm ntsuas nrog lub ntsuas ntsuas, thiab qhov voltage ntawm txoj kab txhaum yog tsawg thaum ntsuas nrog lub multimeter, thaum lub voltage ntawm ob theem siab. Nws tseem ceeb heev uas tam sim no ntws tawm ntawm lub transformer yuav tsum rov qab mus rau lub transformer. Tom qab grounding, yuav muaj tam sim no nruab nrab ntawm qhov nruab nrab ntawm lub transformer thiab grounding wire ntawm transformer, thiab yuav muaj ib tug voltage rau hauv av rau hauv av ntawm lub transformer. tuag. Txoj kev tshawb nrhiav yog txiav cov ceg kab kom cov hauv av tam sim no ploj mus txiav txim qhov txhaum ceg, thiab siv lub clamp ammeter los ntsuas cov ceg kab ntau dua lossis sib npaug rau hauv av tam sim no mus rau qhov chaw uas tam sim no ploj mus nrhiav qhov txhaum. taw tes.
(4) Kev sib cuag tsis zoo ntawm cov xov hlau. Thaum tsis muaj kev thauj khoom lossis lub teeb, nws yog ib txwm siv lub ntsuas hluav taws xob ntsuas hluav taws xob thiab lub tshuab hluav taws xob, thiab qhov hluav taws xob tsis yog lossis qis tom qab siv lub load. Nws yog qhov zoo tshaj plaws los siv txoj kev disconnection los nrhiav qhov yuam kev nrog ib theem load.
(5) Peb-theem plaub-xaim system rhuav tshem cov xaim nruab nrab. Vim tias cov tails thauj khoom ntawm txhua theem txuas nrog ua ke, tam sim no ntawm ib theem tuaj yeem ntws los ntawm ob theem. Lub sijhawm no, yog tias qhov kev tiv thaiv lossis kev thauj khoom ntawm peb theem yog tib yam, ces qhov voltage ntawm txhua theem yog tib yam. Yog hais tias lawv txawv, qhov voltage ntawm theem nrog rau qhov loj tsis kam yog siab dua, uas yog ua dab tsi peb feem ntau hu ua qhov nruab nrab point displacement. Nws yog ib txwm ib txwm ntsuas nrog tus cwj mem hluav taws xob, thiab qhov hluav taws xob ntawm cov kab theem kuj yog ib txwm nrog lub multimeter. Qhov voltage ntawm theem kab mus rau cov kab nruab nrab yog qhov sib txawv thiab ib theem siab dhau lawm. Siv lub clamp multimeter los ntsuas qhov muaj lossis tsis muaj qhov hluav taws xob ntawm cov kab nruab nrab kom pom qhov cuam tshuam ntawm cov kab nruab nrab.
(6) High voltage lov ib theem kab. Txij li thaum lub dav 10kV transformer siv peb-xaim fais fab mov, lub transformer core yog peb-kem hom, ib theem tsis kaj los yog tsis heev ci thaum ntsuas nrog ib tug xeem cwj mem, thiab ob lub xov hlau yog ib txwm thaum ntsuas nrog ib tug multimeter, thaum lub voltage ntawm lwm ob yog tsawg. Nws yog qhov zoo tshaj plaws los txiav cov kab hluav taws xob siab tsis muaj qhov hluav taws xob tsawg, thiab tom qab tshem tawm lub capacitor ntawm cov nyiaj hloov pauv, saib xyuas cov kab hluav taws xob siab kom pom qhov txhaum.
