- 05
- May
Kulephera kusanthula ndi kuchiza ng’anjo yosungunula induction poyambira
Kulephera kusanthula ndi chithandizo cha chowotcha kutentha pa nthawi yoyambira
1. The chowotcha kutentha sichingayambike
Poyambira, ndi DC ammeter yokha yomwe ili ndi malangizo, ndipo palibe voltmeter ya DC kapena voltmeter yapakati pafupipafupi ili ndi malangizo. Ichi ndi chimodzi mwa zochitika zolephereka kwambiri, ndipo zifukwa zake ndi izi.
Pali kusowa kwa zochitika za pulse mu inverter trigger pulse. Gwiritsani ntchito oscilloscope kuti muwone kugunda kwa inverter (makamaka pa GK ya thyristor). Ngati pali kusowa kwa kugunda, fufuzani ngati kugwirizana kuli koipa kapena kotseguka, komanso ngati pali kutulutsa kwamphamvu mu gawo lapitalo.
Kuwonongeka kwa inverter thyristor. Gwiritsani ntchito multimeter kuti muyese kukana pakati pa A ndi K. Popanda madzi ozizira, mtengo pakati pa A ndi K uyenera kukhala waukulu kuposa 10kC, ndipo kukana kuli kofanana ndi 10kC. Nthawi yatha. Ngati awiri a iwo awonongeka panthawi ya muyeso, mukhoza kuchotsa chimodzi mwazitsulo zamkuwa zogwirizanitsa, ndikuweruza ngati chimodzi kapena ziwiri zawonongeka. Bwezerani thyristor ndikuyang’ana chifukwa cha kuwonongeka kwa thyristor (chifukwa cha kuwonongeka kwa thyristor, chonde tchulani kusanthula kotereku kwa chifukwa cha kuwonongeka kwa thyristor). Kuwonongeka kwa capacitor. Gwiritsani ntchito chipika cha RXlk cha multimeter kuti muyese ngati terminal iliyonse ya capacitor yalipitsidwa kapena kutulutsidwa ku terminal wamba. Ngati palibe chosonyeza kuti terminal yawonongeka, chotsani mtengo wowonongeka wa capacitor. Katunduyo ndi wamfupi wozungulira komanso wokhazikika. Mamita 1000V kukana kutchinjiriza (kugwedeza mita) angagwiritsidwe ntchito kuyeza kukana kwa koyilo pansi (popanda madzi ozizira), ndipo iyenera kukhala yayikulu kuposa 1MH, apo ayi malo ocheperako ndi malo oyambira sayenera kuphatikizidwa. . Dera lachitsanzo la siginecha yapakatikati imakhala ndi dera lotseguka kapena lalifupi. Gwiritsani ntchito oscilloscope kuti muwone mawonekedwe a mafunde a chizindikiro chilichonse, kapena gwiritsani ntchito ma multimeter kuti muyese kukana kwa chizindikiro chilichonse cha sampling loop pamene mphamvu yazimitsidwa, ndikupeza malo otseguka kapena achidule. Yang’anani poyang’ana chosinthira chapakatikati cha mayankho kuti muwone ngati mbali yoyambira ndi yotseguka (chifukwa cha kulumikizidwa kwenikweni kwa kutayikira).
2. Ndizovuta kuyamba
Pambuyo poyambira, voteji yapakati yapakati imakhala yoposa nthawi imodzi kuposa magetsi a DC, ndipo magetsi a DC ndi aakulu kwambiri. Zifukwa zolepherera izi ndi izi.
Thyristor imodzi mu inverter circuit yawonongeka. Pamene thyristor yawonongeka mu inverter circuit, the chowotcha kutentha Nthawi zina zimatha kuyambika, koma zomwe tatchulazi zidzachitika pambuyo poyambira. Bwezerani thyristor yowonongeka ndikuwona chomwe chimayambitsa kuwonongeka. Mmodzi wa inverter thyristors ndi osayendetsa, ndiko kuti, “miyendo itatu” ntchito. Zitha kukhala kuti chipata cha thyristor ndi chotseguka, kapena waya wolumikizidwa nawo ndi womasuka kapena wosalumikizana bwino. Pali chigawo chotseguka kapena polarity yolakwika mumayendedwe oyeserera a siginecha yapakati. Chifukwa chamtunduwu nthawi zambiri chimakhala pamzere womwe umatengera njira ya ngodya. Kuzungulira kotseguka kwa siginecha yapakati yamagetsi yamagetsi kapena kubweza polarity ya siginecha yamagetsi yapakati pakukonza zolakwika zina kungayambitse vuto ili. Mbali yakutsogolo yosinthira gawo la inverter yalephera. Katundu wapakati pafupipafupi mphamvu magetsi ndi capacitive, ndiko kuti, panopa amatsogolera voteji. Mu gawo lowongolera sampuli, gawo losinthira gawo limapangidwa. Ngati gawo losunthika lagawo likulephera, limayambitsanso vuto ili.
3. Kuvuta kuyamba
Pambuyo poyambira, mphamvu yayikulu kwambiri ya DC imatha kukwezedwa mpaka 400V, ndipo chowongoleracho chimagwedezeka kwambiri ndipo phokoso limakhala lopanda phokoso. Kulephera kwamtunduwu ndikulephera kwa mlatho wowongolera magawo atatu, ndipo zifukwa zazikulu ndi izi.
The rectifier thyristor ili ndi dera lotseguka, kuwonongeka, kuwonongeka kofewa kapena kuwonongeka kwa magawo amagetsi. Gwiritsani ntchito oscilloscope kuwona mawonekedwe a chubu voteji dontho la thyristor iliyonse yokonzanso, pezani thyristor yowonongeka ndikuyisintha. Pamene thyristor yowonongeka ikuphwanyidwa, chubu yake voteji dontho waveform ndi mzere wolunjika; mu kuwonongeka kofewa, pamene voteji ikukwera pamtengo wina, imakhala mzere wowongoka. Mphamvu yamagetsi ikatsika, mawonekedwe a waveform amasintha pamene voteji ikukwera kumtengo wina. Ngati zomwe zili pamwambazi zichitika, magetsi a DC adzadulidwa, zomwe zimapangitsa kuti riyakitala igwedezeke. Seti ya ziwopsezo zowongoleredwa palibe. Gwiritsani ntchito oscilloscope kuti muwone kugunda kwamtundu uliwonse padera (ndi bwino kuyang’ana pa thyristor). Poyang’ana dera popanda kugunda, gwiritsani ntchito njira yokankhira kumbuyo kuti mudziwe malo olakwika ndikusintha gawo lowonongeka. Izi zikachitika, mutu wamagetsi a DC umakhala wopanda mutu, zomwe zimapangitsa kuti magetsi adulidwe, zomwe zimapangitsa kuti izi zitheke. Chipata cha rectifier thyristor ndi chotseguka kapena chofupikitsa, zomwe zimapangitsa kuti thyristor isayambe. Nthawi zambiri, mtengo wokana pakati pa GK ndi pafupifupi 10 ~ 30Q.
4. Imani mwamsanga mutangoyamba
Itha kuyambika, koma imasiya itangoyamba, ndipo ng’anjo yosungunula induction ili mumayendedwe obwerezabwereza. Kulephera uku ndikulephera kwa ng’anjo yosungunula induction yokhala ndi sweep-frequency start mode, ndipo zifukwa zake ndi izi.
Mbali yotsogolera ndi yaying’ono kwambiri, ndipo kuyamba mobwerezabwereza kumayambitsidwa ndi kulephera kwa kusintha pambuyo poyambira. Poyang’ana mawonekedwe apakati amagetsi amagetsi okhala ndi oscilloscope, onjezani inverter lead angle moyenera.
Chizindikiro cha ma frequency oscillation chili pamphepete mwa mtundu wa ma frequency osangalatsa akunja. Sinthaninso masanjidwe amitundu ina yosangalatsa yojambulira.
5. Ulendo wodutsa pambuyo poyambira
Pambuyo poyambitsa ng’anjo yosungunuka, mphamvu ikakwera kufika pamtengo wina, ng’anjo yosungunuka yotsekemera imakonda kutetezedwa mopitirira muyeso, ndipo nthawi zina thyristor idzawotchedwa ndikuyambiranso, chodabwitsacho chimakhala chofanana. Kulephera kumeneku kumachitika kawirikawiri chifukwa cha zifukwa zotsatirazi.
Ngati overcurrent mwina zimachitika pansi voteji otsika atangoyamba kumene, amayamba chifukwa mbali ya kutsogolo kwa inverter ndi yaing’ono kwambiri ndi inverter thyristor sangathe modalirika anazimitsa.
Madzi amadulidwa kapena kutentha kwa kutentha kumachepetsedwa mu jekete lamadzi lozizira la inverter thyristor. Bwezerani madzi ozizira jekete. Nthawi zina kumakhala kokwanira kuwona kutulutsa kwamadzi ndi kukakamiza kwa jekete yoziziritsa madzi, koma nthawi zambiri chifukwa cha zovuta zamtundu wamadzi, gawo la sikelo limamangiriridwa pakhoma la jekete yoziziritsa madzi. Chifukwa sikelo ndi chinthu chosauka kwambiri matenthedwe matenthedwe madutsidwe, ngakhale pali otaya madzi okwanira Komabe, kutentha dissipation zotsatira kwambiri yafupika chifukwa kudzipatula lonse. Njira yachiweruzo ndi: kuthamanga mphamvu pa mphamvu yotsika kuposa mtengo wamakono kwa mphindi pafupifupi 10, ndipo mwamsanga mutseke, ndipo mwamsanga mugwire pachimake cha thyristor ndi dzanja lanu mutatha kutseka. Ngati mukumva kutentha, vuto limayamba chifukwa cha izi.
Mawaya olumikizira a dera la tanki amalumikizana movutikira komanso amalumikizidwa. Yang’anani mawaya olumikizira a dera la tanki ndikuthana nawo molingana ndi momwe zilili. Pamene waya wolumikiza dera la thanki ili ndi kukhudzana kosauka kapena kutsekedwa, mphamvu idzakwera kufika pamtengo wina, imayambitsa kuyatsa, zomwe zidzakhudza kugwira ntchito kwa ng’anjo yosungunuka, zomwe zidzateteza kusungunuka kwa induction kusungunula. ng’anjo. Nthawi zina chifukwa cha kuwomba, kuwonjezereka kwadzidzidzi kumapangidwa kumapeto kwa thyristor. Ngati chitetezo cha overvoltage chachedwa kwambiri, zigawo za thyristor zidzawotchedwa. Chodabwitsa ichi nthawi zambiri chimayambitsa zochita za munthawi yomweyo za overvoltage ndi overcurrent.
6. Palibe yankho poyambitsa
Pamene ng’anjo yosungunula induction ikuyamba, palibe yankho. Pambuyo poyang’ana, kusowa kwa kuwala kwa gawo pa bolodi loyang’anira dera kumayatsidwa. Kulephera uku kumachitika chifukwa chazifukwa zotsatirazi: fuse yofulumira imawombedwa. Nthawi zambiri fusesi yothamanga imakhala ndi chithunzi chosakanikirana, mutha kuweruza ngati fuseyi yatenthedwa poyang’ana zomwe zikuwonetsedwera, koma nthawi zina chifukwa chakugwiritsa ntchito nthawi yayitali ya fuse kapena zifukwa zabwino, zomwe zikuwonetsa sizikuwonekera bwino kapena chizindikiritso sichikuwonekera bwino. muyenera kudula mphamvu kapena kugwiritsa ntchito multimeter kuyeza. Njira yothandizira ndi: m’malo mwa fusesi yofulumira ndikusanthula chomwe chimayambitsa kuwomba. Zifukwa zazikulu zowomba fuse mwachangu ndi izi. The chowotcha kutentha imayenda pansi pa mphamvu yamphamvu komanso yamphamvu kwambiri kwa nthawi yayitali, zomwe zimapangitsa kuti fusesi yofulumira ipangitse kutentha, zomwe zimapangitsa kuti fuseyi ikhale yosungunuka. Chowonjezera kapena kuchuluka kwa ma frequency apakati kumakhala kozungulira pang’ono, zomwe zimapangitsa kuti pakhale kugunda kwanthawi yomweyo ndikuwotcha fusesi yothamanga. Dera la katundu liyenera kufufuzidwa. Kulephera kwa kayendedwe ka rectifier kumapangitsa kuti pakhale kukhudzidwa kwakukulu komwe kumachitika nthawi yomweyo. Dera lokonzanso liyenera kufufuzidwa.
Kulumikizana kwa chosinthira chachikulu kumatenthedwa kapena makina opangira magetsi akutsogolo ali ndi kulephera kwa gawo. Gwiritsani ntchito AC voltage block ya multimeter kuyeza voteji pamzere uliwonse kuti mudziwe komwe cholakwikacho.