Kufufuza Mfundo za Oteteza Odwala?
Ndimamvabe fungo la vanishi woyaka kuchokera ku mayeso omwe tidayesa chaka chatha—kugunda kamodzi kwa 6 kV ndipo bolodi losayerekezeka linasanduka lakuda pakatha theka la sekondi.
Choteteza mafunde chimagwira ntchito potenga mphamvu yowonjezera ndikuyikankhira pansi, kenako chimatseka mphamvu yamagetsi yomwe ingawononge makina anu. Ndimamanga mayunitsi awa tsiku lililonse ku Wenzhou ndikuyesa motsatira IEC 61643-11.
Ngati mukudziwa momwe chinyengochi chimachitikira, mutha kusankha gawo loyenera ndikusiya kulipira pazinthu zomwe simugwiritsa ntchito. Pitirizani kuwerenga ndipo ndikuwonetsani luso la chipangizochi.
Zolinga zazikulu: kusamutsa mphamvu ndi kukakamiza magetsi?
Ndinaonapo nthawi ina pamene mphamvu ya 40 kA inalephera kuyendetsa galimoto ndi micro-sekondi imodzi chifukwa MOV inadina nthawi—disiki yaying'ono imeneyo inapulumutsa inverter ya $12,000.
Zolinga ziwiri zazikulu ndi izi: (1) kusuntha mphamvu ya mafunde kupita pansi mofulumira, ndi (2) kusunga mphamvu yamagetsi yomwe imafika pa katundu pansi pa malire otetezeka olembedwa pa pepala la deta.
Momwe Mphamvu Zimayendera Mkati mwa Bokosi
Kukwera kwa mphamvu kufika pa mzere. Mphepete ya MOV imatsika kuchokera ku mega-ohms kupita ku ohms mu masekondi a nano. Mphamvu yamagetsi imatenga njira yosavuta kudzera mu chipangizocho, kenako imatsika pansi pa waya wobiriwira-wachikasu. Waya ikatentha, mpepetente wake umachepa, kotero timagwiritsa ntchito 6 mm² Cu ndikusunga lead pansi pa 50 cm. Kutalika kulikonse kowonjezera kumawonjezera 1 µH ya inductance ndipo izi zimawonjezera 1 kV ku voltage yolowetsa. Makasitomala amaiwala tsatanetsatane uwu ndikuimba mlandu gawolo pamene bolodi likadali kufa.
Kutseka Voltage vs Let-Through Voltage
Anthu amasakaniza manambala awiriwa. Voltage yotsekereza ndi yomwe MOV imawona. Voltage yolowetsa ndi yomwe katundu amawona chingwe chikatsika. Nthawi zonse ndimalemba zonse ziwiri pa pepala langa loyesera. Gawo lomwe limatsekereza pa 700 V lingathe kulola 1,200 V kufika pa VFD ngati mchira wa dziko lapansi uli 80 cm. Dulani mchira, dulani ululu.
Deta Yeniyeni Yochokera ku Lab Yathu
| Mulingo Wokwera | Kukula kwa MOV | Mtsogoleri wa Dziko Lapansi | Letsani-Kudutsa | Zotsatira |
| 20 kA 8/20 µs | Disiki ya 32 mm | 25 cm | 980 V | PASI |
| 20 kA 8/20 µs | Disiki ya 32 mm | 80 cm | 1.450V | KULEPHERA |
| 40 kA 8/20 µs | Chimbale cha 40 mm | 25 cm | 1.050V | PASI |
Tebulo likuwonetsa kuti kutalika kwa chingwe kumaposa kukula kwa MOV. Ndikuuza wogula aliyense kuti: gwiritsani ntchito ndalama imodzi yowonjezera pa ma lead afupi musanagwiritse ntchito asanu pa gawo lalikulu.
Chifukwa Chake Timawonjezera Chitoliro Chotulutsa Gasi mu Mapangidwe Osakanikirana
MOV imatopa ikatha mphamvu zambiri. GDT imatha kutenga zithunzi zambiri koma imachedwa. Timaziyika pamodzi. MOV imayamba kaye ndipo imatseka ma ns 100 oyamba. Kenako GDT imayatsa moto ndikutenga mphamvu yamagetsi. MOV imapuma ndikukhala ndi moyo wautali. Hybrid tsopano ndiyo yogulitsidwa kwambiri ku mafamu a dzuwa aku Germany chifukwa ogwira ntchito pamalopo akufuna moyo wa zaka 20, osati zaka zisanu.
Zigawo zazikulu ndi njira zodzitetezera zotsatizana?
Nditatsegula imodzi mwa mayunitsi athu a Type 1+2 ndinaona ma MOV, ma GDT, ma fuse, ndi switch yaying'ono yotenthetsera yomwe imadina ngati ketulo ikatopa.
Zigawo zazikulu ndi izi: (A) ma varistors kapena ma GDT omwe amadya mphamvu, (B) kutsekedwa kwa kutentha komwe kumayimitsa moto, ndi (C) ma fuse osungira omwe amachotsa ma short circuits. Timayika izi m'magawo atatu kuti zigwirizane ndi makina olumikizira magetsi mufakitale.
Gawo Loyamba: Mtundu 1 Pakhomo la Utumiki
Gawo ili likuwona mphezi yolunjika. Timagwiritsa ntchito chubu cha impulse cha 25 kA 10/350 µs kuphatikiza block ya MOV ya 50 kA. Cholinga chake ndikuchotsa mphamvu ya strike kuchoka pa 1,000 kV kufika pansi pa 4 kV isanalowe mu switchboard. Timayiyika pa rail ya 35 mm DIN ndikuyilumikiza ndi 16 mm² Cu ku bar yayikulu ya earth. Bowo limodzi la bolt pamalo olakwika limawonjezera 2 µH ndi 2 kV yowonjezera. Ndimayang'ana chithunzicho kawiri; wogula amasunga transformer yokazinga.
Gawo Lachiwiri: Mtundu Wachiwiri pa Ma Sub-Panels
Chigawochi chimaletsa kukwera kwa magetsi komwe kumachitika chifukwa cha ma strike apafupi kapena switch yayikulu ya mota. Timasankha ma MOV a 40 kA 8/20 µs okhala ndi kutsekedwa kwa kutentha. Chigawocho chimalumikizidwa kuti wogwiritsa ntchito athe kuchisintha popanda kuwononga mphamvu. Timawonjezera LED yobiriwira yomwe imazima gawo likafa. Woyang'anira malo ku Milan anandiuza kuti akhoza kuyang'ana mapanelo 50 mumphindi khumi pongoyenda m'njira ndikuwerenga madontho obiriwira.
Gawo Lachitatu: Mtundu 3 pa Katundu
Ma drive, ma PLC ndi ma PC amafunika chitetezo chapafupi. Timagwiritsa ntchito ma unit a 10 kA 8/20 µs okhala ndi mphamvu yotsika pansi pa 900 V. Chigawocho chimalowa m'bokosi la khoma kapena mkati mwa socket strip. Chingwe kuchokera ku Type 2 kupita ku katundu chiyenera kukhala pansi pa 10 m. Ngati kuthamanga kuli kotalika, timawonjezera Mtundu wina wa 3. Ndinasungapo servo ya $4,000 powonjezera SPD ya socket ya $9 chifukwa gululo linali pa mtunda wa 30 m.
Momwe Magulu Amalankhulirana
Mphamvu zili ngati madzi. Ngati damu loyamba ladzaza, damu lachiwiri liyenera kukhala lokonzeka. Timayika ma voltage milingo m'magawo awa: Ma clamp amtundu 1 pa 1.8 kV, Mtundu 2 pa 1.4 kV, Mtundu 3 pa 0.9 kV. Gawo lotsika siliyamba gawo lapamwamba lisanayambe, kotero gawo lililonse limagawana katundu. Timayesa unyolo wonse mu labu yathu ndi mayunitsi atatu motsatizana ndi 100 kA strike. Let-through kumapeto kwa socket ndi 720 V, yotetezeka pa 230 V drive iliyonse.
Mndandanda wa Zigawo zomwe Timagwiritsa Ntchito Tsiku Lililonse
| Gawo | Udindo | Zofunikira | Mayendedwe a Moyo |
| 40 mm MOV | Chotsekera | 40 kA 8/20 µs | Nyimbo 20 zazikulu |
| Chosinthira kutentha | Malo oimika moto | 120 °C | Kujambula kamodzi |
| Fuse ya 6 A gG | Kumveka mwachidule | Kusweka kwa 50 kA | Kujambula kamodzi |
| Chubu cha GDT | Kusunga zobwezeretsera | Mphamvu ya 600 V | Kugunda 100 |
| Chotsukira cha LED + | Udindo | 2 mA ngalande | zaka 10 |
Kugwirizana ndi chitetezo?
Ndimakumbukirabe tsiku limene fuse ya kutentha inaphulika ndipo mbendera yofiira inauza akatswiri kuti asinthe chipangizocho—palibe vuto, palibe moto, mphindi zisanu zokha.
SPD iyenera kugwira ntchito ndi ma breaker, earthing ndi cable routing. Timawonjezera ma thermal fuse, micro-switch ndi ma remote signals kuti gulu la siteshoni lidziwe ngati gawolo latopa ndipo chitetezo chosunga deta chimayamba kugwira ntchito.
Chifukwa Chake SPD Imafunikira Woswa Monga Bwenzi
MOV imatha kufupikitsa magetsi ikafa. Fuse yosungira iyenera kuchotsa vutolo isanapse. Timalumikiza fuse curve ndi MOV fault current. MOV ya 40 kA imalephera pa 1 kA short. Timasankha fuse ya 6 A gG yomwe imatuluka mu 0.1 s pa 1 kA. Fuse simatuluka pa normal surge current chifukwa imatenga masekondi ochepa. Masamu ndi ochepa, koma amagwira ntchito. Ndimapatsa ogula tchati cha fuse kuti katswiri wawo wamagetsi asaganizire.
Kutumiza Zizindikiro Zakutali kwa Masamba Aakulu
Kasitomala m'modzi amayendetsa ziwiya zamagalasi maola 24 pa tsiku, masiku 7 pa sabata. Sangathe kuyenda pafakitale sabata iliyonse. Timayika chosinthira chaching'ono mkati mwa SPD chomwe chimatembenuka pamene thermal disc ikutsegulidwa. Chosinthiracho chimapatsa mphamvu ya 24 V PLC. Nyali yofiira pa HMI imanena kuti "SPD yafa." Wogwira ntchitoyo amatiyimbira foni, timatumiza katiriji yotsala, ndipo amaisintha pakusintha kwa shift yotsatira. Palibe chomwe chimayima mosakonzekera patatha zaka ziwiri.
Kugwirizana ndi RCD ndi Arc Detectors
Mainjiniya ena amaopa kuti kutayikira kwa SPD kungagwetse RCD. Timasunga kutayikira pansi pa 0.3 mA pa 230 V. RCD ya 30 mA siiona. Ngati tsambalo likugwiritsa ntchito zida zoyesera arc, timawonjezera fyuluta ya EMI patsogolo pa SPD kuti kukanikiza kwapamwamba kusapusitse chida choyesera. Tinayesa kusakaniza kumeneku ku TÜV Rheinland ndipo tinapambana.
Zizindikiro Zofunikira Zogwirira Ntchito?
Ndimatsatira manambala atatu pa kutumiza kulikonse: mphamvu yolowera, kuchuluka kwa kulephera pa ma PC 1,000, ndi nthawi yosinthira pamalopo. Ngati pali vuto lililonse, ndimayimitsa mzerewo.
Ma KPI apamwamba ndi awa: (1) mulingo woteteza magetsi (Kukwera) womwe umayesedwa mu labu, (2) kuchuluka kwa moyo wamagetsi asanawonongeke, ndi (3) nthawi yapakati yosinthira (MTTR) pamakina amoyo. Ndimalemba izi pa gulu lililonse lomwe timagulitsa.
Chifukwa Chake Let-Through Ndi Mfumu
Kutsika kwa 200 V mu Up kungapangitse kuti diski iliyonse ya MOV ikhale ndi moyo wowirikiza kawiri. Timayesa diski iliyonse ya MOV pa 100% current ndikulemba voltage. Ma disc omwe amawerenga kwambiri amapita ku solar farm line komwe clamping sikofunikira kwenikweni. Ma disc omwe amawerenga otsika amapita ku German PLC line. Mtundu uwu umawonjezera ola limodzi pakupanga koma umachepetsa zolakwika zamunda ndi 40%. Ndimalipira ola, ndimasunga kuyimba kwausiku.
Mayeso Owerengera Moyo Omwe Timachita
Timagunda gawo lomwelo ndi 20 kA mphindi zisanu zilizonse mpaka chosinthira kutentha chituluke. Chosungira mbiri chidatenga ma shoti 27. Timasindikiza curve pa pepala la data. Ogula akuwona kuti gawolo likugwirabe ntchito patatha zaka khumi za kukwera kwabwinobwino. Chithunzi chimodzi chimenecho chimatseka mapangano ambiri kuposa kutsika kwanga kwamtengo wabwino kwambiri.
Mapeto
Kusamutsa mphamvu, kukakamiza, zigawo, zosungira ndi ma KPI omveka bwino—ndi nkhani yonse. Sankhani SPD yomwe imapeza zotsatira zochepa pa let-through ndi return rate yotsika, ndipo mumagula tulo.