Kuv yuav ua li cas yog tias lub transformer luv luv -circuited dheev?

Txhawm rau cuam tshuam nrog transformer luv luv-circuit xwm txheej hauv kev ua haujlwm txhua hnub, nws yog ib qho tsim nyog yuav tsum paub txog qhov tseem ceeb ntawm qhov teeb meem los ntawm kev tshuaj xyuas thiab kev sim. Thaum lub transformer raug kev txom nyem tam sim ntawd, ob lub siab thiab qis voltage sab yuav raug rau ib tug loj luv luv tam sim no. Nyob rau hauv ib lub sij hawm luv luv thaum lub Circuit Court breaker lig dhau los qhib, lub luv luv Circuit Court tam sim no yuav tsim ib tug electromotive quab yuam proportional rau lub square ntawm tam sim no, uas yuav ua rau lub windings ntawm lub transformer. Electrodynamic quab yuam yuav muab faib ua radial quab yuam thiab axial quab yuam.

Thaum lub sij hawm luv luv Circuit Court, lub radial quab yuam ua rau lub winding yuav ua rau lub high voltage winding nyob rau hauv nruj nro thiab tsis tshua muaj voltage winding nyob rau hauv siab. Vim hais tias cov windings yog ncig, cov khoom ncig yog yooj yim deformed los ntawm lub siab dua los ntawm kev nro, yog li qis -voltage windings yog yooj yim deformed. Lub axial quab yuam generated thaum lub sij hawm luv luv Circuit Court compresses lub winding thiab ua rau lub axial txav ntawm lub siab thiab tsis tshua muaj voltage windings, thiab lub axial quab yuam kuj ua rau cov hlau core thiab clamp. Yog li ntawd, thaum lub transformer raug kev txom nyem los ntawm ib tug tam sim ntawd luv luv Circuit Court, qhov tsawg -voltage windings thiab tshuav windings feem ntau yuav deformed, raws li los ntawm high- thiab nruab nrab-voltage windings, hlau cores thiab clips. Ntxiv rau kev kuaj xyuas lub ntsiab windings, hlau cores, clamps thiab lwm qhov chaw tom qab lub transformer luv luv -circuit kev huam yuaj, ib tug series ntawm cov teeb meem yuav tsum tau them sai sai mus rau hauv tus txheej txheem:

■ Inspection and testing of windings

Thaum lub transformer luv luv -circuited, nyob rau hauv qhov kev txiav txim ntawm hluav taws xob fais fab, cov windings yog ib txhij raug rau ntau yam zog xws li compression, nro, dabtsi yog khoov, thiab lwm yam. Qhov txhaum tshwm sim los ntawm lawv yog heev zais thiab tsis yooj yim rau tshuaj xyuas thiab kho. winding mob.

■ Measurement of transformer DC resistance

Raws li qhov ntsuas tus nqi ntawm DC tsis kam ntawm lub tshuab hloov pauv, txhawm rau txheeb xyuas qhov tsis sib haum ntawm DC qhov tsis sib npaug ntawm cov winding thiab sib piv nrog cov nqi ntsuas yav dhau los, nws tuaj yeem tshawb xyuas qhov kev puas tsuaj ntawm lub transformer winding. Piv txwv li, tom qab luv luv - Circuit Court kev huam yuaj ntawm lub transformer, DC tsis kam ntawm qhov qis -voltage sab C nce li ntawm 10 feem pua. Los ntawm qhov no, nws tau txiav txim siab tias cov winding yuav muaj cov strands tshiab. Thaum kawg, lub winding tau raug tshem tawm mus kuaj, thiab pom tias ib txoj hlua ntawm C-theem winding tau tawg.

■ Measurement of Transformer Winding Capacity

Lub capacitance ntawm winding yog tsim los ntawm winding inter-tig, inter- txheej thiab inter- ncuav mog qab zib capacitance thiab winding generating capacitance. Lub capacitor no muaj feem xyuam rau qhov sib txawv ntawm cov winding thiab cov tub ntxhais hlau thiab hauv av, qhov sib txawv ntawm cov winding thiab cov tub ntxhais hlau, qhov sib txawv ntawm cov lem ntawm winding, qhov sib txawv ntawm cov khaubncaws sab nraud povtseg thiab qhov sib txawv ntawm cov khoom qab zib. Thaum lub winding yog deformed, nws feem ntau yog khoov rau hauv ib qho duab, uas ua rau qhov sib txawv me me ntawm cov winding thiab cov tub ntxhais hlau, thiab lub capacitance ntawm winding rau hauv av yuav loj dua, thiab qhov sib txawv me me, qhov loj dua. lub capacitance hloov, yog li lub winding Lub capacitance tuaj yeem cuam tshuam qhov cuam tshuam ntawm deformation ntawm winding.

■ Inspection behind the hood

Tom qab lub transformer raug tshem tawm, yog hais tias muaj molten tooj liab slag, txhuas slag los yog fragments ntawm high - ceev cable daim ntawv nyob rau hauv lub transformer, nws muaj peev xwm txiav txim hais tias lub winding tau deformed mus rau ib tug loj npaum li cas thiab tawg strands, thiab lwm yam. . Tsis tas li ntawd, qhov kev tshem tawm los ntawm winding spacer block, ntog tawm, siab phaj sib npaug, siab ntsia hlau hloov chaw, thiab lwm yam kuj tuaj yeem txiav txim siab qhov kev puas tsuaj rau lub winding.

■ Inspection of iron cores and clamps

Cov tub ntxhais hlau ntawm lub transformer yuav tsum muaj lub zog txhua yam txaus. Lub zog txhua yam ntawm cov tub ntxhais hlau yog lav los ntawm lub zog ntawm txhua qhov clamping ntawm cov tub ntxhais hlau thiab lawv cov khoom sib txuas. Thaum lub winding tsim hluav taws xob, lub zog axial ntawm winding yuav raug offset los ntawm cov tshuaj tiv thaiv quab yuam ntawm cov clip. Yog hais tias lub zog ntawm cov clip thiab rub phaj yog tsawg dua lub zog axial, qhov clip, rub phaj thiab winding yuav puas. Yog li ntawd, qhov xwm txheej ntawm cov tub ntxhais hlau, clips, rub daim hlau thiab lawv qhov txuas yuav tsum tau ua tib zoo xyuas, thiab cov xwm txheej yuav tsum tau kuaj xyuas:

① Check whether the iron yoke chip on the iron core moves up and down.

② The insulation resistance of the grommet screw and the iron core should be measured, check whether the jacket of the grommet screw is damaged, and check whether the pull plate and the connecting parts of the pull plate are damaged.

③ When the transformer is short-circuited, displacement may occur between the pressure plate and the clamp, causing the ground connection piece of the iron yoke on the pressure plate and the pressure nail to be broken or burnt due to overcurrent. Therefore, for the winding pressure plate, in addition to checking the damage of the pressure nail and the pressure plate, it is also necessary to check whether the ground connection between the winding, the pressure nail and the upper iron yoke is reliable.

■ Analysis of transformer oil and gas

Tom qab lub transformer raug ntaus los ntawm ib tug luv luv Circuit Court, ib tug loj npaum li cas ntawm cov roj yuav sau nyob rau hauv cov roj relay. Yog li ntawd, tom qab ib qho kev sib tsoo transformer, cov pa roj hauv cov roj relay thiab cov roj hauv transformer tuaj yeem raug kuaj thiab tshuaj xyuas los txiav txim qhov xwm txheej ntawm qhov xwm txheej.

■ Matters needing attention in transformer short-circuit fault handling

(1) Thaum hloov cov insulating qhov chaw, qhov kev ua tau zoo ntawm cov khoom insulating yuav tsum tau lav

Ntsuam xyuas qhov ua tau zoo ntawm qhov hloov insulating qhov chaw thaum lub sijhawm ua haujlwm, thiab siv lawv tsuas yog tias lawv ua tau raws li qhov yuav tsum tau ua. Hauv particular, yuav tsum tau them nyiaj rau rwb thaiv tsev ntawm cov hlau lead bracket ntoo thaiv, thiab cov ntoo thaiv yuav tsum tau muab tso rau hauv ib lub thermal transformer roj ntawm txog 80 degree C rau ib lub sij hawm ntawm lub sij hawm ua ntej installation los xyuas kom meej lub rwb thaiv tsev ntawm cov ntoo thaiv.

(2) Kev ntsuas hluav taws xob hluav taws xob yuav tsum tau ua thaum lub tshuab hluav taws xob tseem roj rau 24 teev

Since some damp insulating parts are soaked in hot oil for a long time, the water will diffuse to the surface of the insulation, so the test after oil injection often cannot detect insulation defects. For example, the low-voltage side of a 31.5MVA 110kV transformer was replaced with a wooden support block of 10 kV copper bar during treatment. After the transformer was filled with oil, everything was normal, and the insulation resistance of the 10kV low-voltage side to the iron core, clamps and ground was reduced to about 1 MΩ. After inspection of the hood, it was found that the insulation of the wooden block of the support of the 10 kV copper bar was very low. Therefore, the insulation test should be performed more reliably after the transformer has been oiled for 24 hours.

(3) Kev ceev faj yuav tsum tau them rau cov kaum ntse ntse ntawm cov tub ntxhais hlau thaum nws rov ua dua

Thaum cov tub ntxhais hlau muab rov qab rau ntawm tus quab hlau, kev saib xyuas yuav tsum tau them nyiaj rau lub kaum ntse ntse ntawm cov hlau core chips, thiab cov rwb thaiv tsev ntawm cov roj yuav tsum tau ntsuas lub sijhawm, tshwj xeeb tshaj yog cov kaum ntse ntse ntawm cov chips ntawm cov roj. , txhawm rau tiv thaiv cov tub ntxhais hlau los ntawm kev ua hauv av ntawm ntau lub ntsiab lus vim qhov sib tshooj ntawm cov chips. Piv txwv li, rau 120MVA 220kV transformer, thaum lub winding yog hloov nyob rau hauv qis-voltage sab thiab tus quab ntawm hlau yog ntsia, vim hais tias lub ntse ces kaum ntawm lub nti tsis tau them sai sai mus rau lub sij hawm. lub reassembly, thiab rwb thaiv tsev ntawm cov roj passages tsis tau ntsuas nyob rau hauv lub sij hawm, lub rwb thaiv tsev ntawm cov roj passages yog ntsuas tom qab installation li 0, nws siv sij hawm ntev los nrhiav nws vim hais tias lub kaum ntse ntse ntawm cov hlau core nti shorted cov roj passage. .

(4) Hloov cov khoom siv winding nrog lub zog luv luv - Circuit Court tsis kam

Lub zog txhua yam ntawm kev txhim kho cov qauv transformer winding yog txiav txim siab los ntawm ob yam hauv qab no:

① One is the mechanical strength of the winding, which is determined by the structure of the winding itself;

② The second is the mechanical strength determined by the support on the inner diameter side of the winding, the axial compression structure of the winding, and the manufacturing process of the pull plate and the clip. At present, most transformer manufacturers use semi-hard copper wire or self-adhesive transposed wire to improve the short-circuit resistance of the winding, and use a better quality cardboard tube or increase the number of struts to improve the radial force of the winding. And the use of pull plates or spring pressure nails to improve the ability of the winding to receive axial force.

Raws li lub tuam txhab kev lag luam ntawm lub chaw tsim hluav taws xob hloov hluav taws xob, thaum kev ua qauv qhia ua ntej kos npe rau daim ntawv cog lus muag khoom transformer thiab thaum hloov pauv winding, luv luv -circuit resistance ntawm winding yuav tsum tau soj ntsuam tag nrho thiab txaus siab.

(5) Qhuav ntawm transformers

Txij li thaum lub transformer raug cuam tshuam los ntawm luv luv Circuit Court, nws feem ntau siv sij hawm ntev rau kev kho. Txhawm rau tiv thaiv lub transformer los ntawm damp, ob qho kev ntsuas yuav tsum tau ua:

① One is to buckle the transformer cover and use a vacuum pump to evacuate the transformer to remove the free water on the surface of the transformer body. When starting work the next day, use dry nitrogen or dry air to release the vacuum. After the maintenance, the hot oil can be directly put into operation after 24 hours of circulation.

② The second is to take rain-proof measures for the transformer after finishing work every day. After the work is completed, use the hot oil spray method to dry the transformer. This method generally takes 7 to 10 days.

(6) Lwm yam teeb meem xav tau kev saib xyuas

Tom qab luv luv -circuit kev huam yuaj tshwm sim nyob rau hauv ib tug transformer, nyob rau hauv tas li ntawd mus kuaj lub transformer raws li cov khoom siv pa, cov kev ntsuam xyuas ntawm transformer roj, roj nyob rau hauv cov roj relay, winding DC tsis kam, winding capacitance, thiab winding deformation yuav tsum siv los txiav txim thiab txheeb xyuas qhov kev ua txhaum, thiab tshawb xyuas qhov deformation ntawm winding, kev hloov pauv thiab xoob ntawm cov tub ntxhais hlau thiab cov clamp, thiab tom qab ntawd txiav txim siab txog kev kho mob rau lub transformer thiab kev tiv thaiv kev tiv thaiv. Thaum lub winding yog deformed loj heev vim lub luv luv - Circuit Court kev huam yuaj ntawm lub transformer thiab winding yuav tsum tau hloov, yuav tsum tau them nyiaj mloog mus rau lub reassembly ntawm cov hlau core nti, ziab ntawm tag nrho cov insulating qhov chaw, kev kho mob. ntawm cov roj transformer thiab tag nrho ziab ntawm lub transformer.