Tsib yam khoom ntawm kev tiv thaiv kev co (SPD)

Cov khoom siv tiv thaiv kev kub ntxhov (SPD) yog cov khoom tseem ceeb hauv cov tshuab hluav taws xob niaj hnub no, muab kev tiv thaiv tiv thaiv kev nce thiab nqis ntawm lub zog hluav taws xob ib ntus. Nws qhov tseem ceeb tsis tuaj yeem hais ntau dhau, thiab kev nkag siab txog cov khoom ntawm SPD yog qhov tseem ceeb rau kev xaiv cov khoom siv kom raug rau koj cov kev xav tau tshwj xeeb. SPDs yog tsim los ntawm tsib yam khoom tseem ceeb: qhov sib txawv ntawm qhov tso tawm, lub raj tso tawm roj, lub diode suppressor, varistor thiab choke, txhua yam uas ua lub luag haujlwm tseem ceeb hauv kev tiv thaiv koj cov khoom siv hluav taws xob.

Qhov chaw tso tawm yog qhov tseem ceeb ntawm SPD thiab muaj ob lub pas hlau sib cais los ntawm qhov chaw tshwj xeeb. Ib qho ntawm cov pas hlau txuas nrog lub xov hluav taws xob L1 lossis lub xov nruab nrab (N) ntawm cov khoom siv tiv thaiv, thiab lwm lub pas hlau txuas nrog lub xov av (PE). Thaum muaj qhov xwm txheej overvoltage transient, qhov chaw tso tawm tawg, tso cai rau ib feem ntawm qhov them overvoltage raug xa mus rau hauv av, tiv thaiv lub zog hluav taws xob kom tsis txhob nce rau ntawm cov khoom siv tiv thaiv. Txawm hais tias cov qauv yooj yim, nws qhov kev ua haujlwm tsis zoo ntawm arc-extinguishing tau ua rau muaj kev txhim kho, xws li qhov chaw angular, uas muab cov peev xwm zoo dua ntawm arc-extinguishing.

Ib qho tseem ceeb ntxiv yog lub raj xa roj, uas muaj ob lub phaj cathode txias uas kaw rau hauv lub raj iav lossis lub raj ceramic uas muaj cov roj inert. Cov khoom no ua rau muaj feem ntau ntawm lub raj xa roj ua haujlwm thiab ua lub luag haujlwm tseem ceeb hauv kev hloov cov hluav taws xob ntau dhau ntawm cov khoom siv rhiab heev. Tsis tas li ntawd, cov neeg sawv cev ua haujlwm feem ntau suav nrog los ua kom zoo dua qhov ua tau zoo ntawm lub raj xa roj.

Cov diodes tiv thaiv yog cov khoom tseem ceeb nrog clamping thiab voltage limiting functions. Nws ua haujlwm hauv thaj chaw tawg rov qab, muaj clamping voltage qis thiab teb sai, thiab tsim nyog siv ua qhov kawg tiv thaiv hauv ntau theem tiv thaiv circuits. Nws cov yam ntxwv volt-ampere yog sawv cev los ntawm cov mis I = CUα, qhia txog nws cov coefficients nonlinear, ntxiv qhov tseem ceeb ntawm nws cov txiaj ntsig hauv kev tswj hwm voltage spikes thiab surges.

Nyob rau hauv lub sijhawm niaj hnub no uas thev naus laus zis ceev ceev, qhov xav tau cov khoom siv tiv thaiv hluav taws xob tsis tau siab dua li no. Los ntawm kev sib cuam tshuam ntawm tsib lub ntsiab lus tseem ceeb no, SPDs muab kev tiv thaiv zoo tiv thaiv cov hluav taws xob hloov pauv, ua kom ntseeg tau tias cov khoom siv hluav taws xob muaj kev ruaj khov thiab ntev. Thaum cov kab ke hluav taws xob nyuaj zuj zus, qhov xav tau cov kev daws teeb meem tiv thaiv hluav taws xob ua tiav, ua rau kev nkag siab txog cov khoom SPD tseem ceeb rau kev ua kom muaj kev nyab xeeb thiab kev ua haujlwm zoo ntawm cov khoom siv hluav taws xob niaj hnub.