KEV SIB XYUAS KEV UA HAUJ LWM NTAWM SF6 COV KHOOM SIV UA KE THIAB CIRCUIT BREAKER

Kev Sib Piv Kev Ua Haujlwm ntawm SF6 Combination Appliance thiab Circuit Breaker

Kev ua haujlwm tsis muaj load transformer tawg

Feem ntau ntawm cov khoom thauj ntawm lub nplhaib tseem ceeb hauv lub kaw lus faib hluav taws xob yog kev faib thiab kaw ntawm lub tshuab hloov pauv faib. Lub peev xwm dav dav yog 315-1250 kVA, thiab tam sim no tsis muaj thauj khoom ntawm lub tshuab hloov pauv faib yog li 2% ntawm qhov tam sim no ntsuas. Thaum rhuav lub tshuab hloov pauv tsis muaj thauj khoom, yog tias lub tshuab hluav taws xob muaj peev xwm tua hluav taws xob arc muaj zog, thiab txoj kev tua hluav taws xob arc yog hom zog sab nraud, qhov xwm txheej ntawm kev yuam arc tua hluav taws xob txiav tawm ua ntej xoom yuav tshwm sim, ua rau muaj kev txiav tawm overvoltage. Yog tias lub tshuab hluav taws xob siv, vim nws muaj peev xwm tua hluav taws xob arc, nws yog tsim los rhuav tshem tam sim no luv luv loj. Thaum rhuav tshem tam sim no me me ntawm lub tshuab hloov pauv tsis muaj thauj khoom, kev yuam arc tua hluav taws xob yuav tshwm sim, ua rau muaj kev txiav tawm overvoltage. Hauv qhov no, nws tsis yog qhov xav tau siv cov tshuab hluav taws xob nrog lub peev xwm tua hluav taws xob arc muaj zog. Thiab SF6 load switch, vim yog cov yam ntxwv hluav taws xob ntawm SF6 roj, thaum lub arc txias hauv SF6 roj, nws tseem ua hluav taws xob kom txog thaum qhov kub qis heev, thiab qhov txiav tam sim no ua ntej qhov tam sim no xoom hla yog me me, yog li zam kev overvoltage siab. Yog li ntawd, kev ua tau zoo ntawm kev siv SF6 load switch los rhuav tshem lub transformer tsis muaj load zoo dua li ntawm SF6 circuit breaker, thiab SF6 circuit breaker zoo dua li lub tshuab nqus tsev circuit breaker.

Tiv thaiv kev ua tau zoo ntawm cov hloov pauv faib khoom

Rau kev tiv thaiv cov transformers faib tawm, kev siv SF6 load switch + fuse ua ke zoo dua li cov circuit breakers, thiab qee zaum qhov kawg tsis tuaj yeem ua lub luag haujlwm tiv thaiv zoo. Kev sim luv luv qhia tau tias thaum lub transformer roj-immersed luv luv, txhawm rau tiv thaiv lub tank roj los ntawm kev tawg, qhov txhaum yuav tsum tau tshem tawm hauv 20 milliseconds. Kev txwv qhov luv luv tam sim no tus nqi tuaj yeem tiv thaiv lub transformer tau zoo. Lub sijhawm tawg tag nrho ntawm lub circuit breaker muaj peb ntu, lub sijhawm tiv thaiv relay + lub sijhawm ua haujlwm ntawm lub circuit breaker + lub sijhawm arcing, uas feem ntau xav tau peb lub voj voog (60 milliseconds), yog li nws tsis tuaj yeem tiv thaiv lub transformer tau zoo. Txawm tias cov transformers qhuav-hom zoo dua li siv cov circuit breakers vim yog kev tiv thaiv ceev ntawm fuses.

Kev ua haujlwm sib koom tes tiv thaiv relay

Kev tiv thaiv ntawm lub circuit breaker ntawm lub taub hau kawg ntawm lub nplhaib network faib network (lub 10kV pub-tawm circuit breaker ntawm lub substation) feem ntau yog teem rau 0 vib nas this rau kev tawg sai, 0.5 vib nas this rau overcurrent, thiab 0.5 vib nas this rau xoom sequence. Yog tias lub circuit breaker siv hauv lub nplhaib tseem ceeb, txawm tias nws tau teem rau 0.5 vib nas this, nws nyuaj rau xyuas kom meej tias thawj-kawg circuit breaker tsis ua haujlwm ua ntej vim yog qhov kev sib cais ntawm lub sijhawm ua haujlwm ntawm lub circuit breaker. Lub fuse txwv tam sim no tsis cuam tshuam los ntawm qhov poob voltage los ntawm lub luv luv circuit, thiab tuaj yeem tshem tawm qhov txhaum hauv lub sijhawm luv luv yam tsis ua rau muaj kev dhia dhia.