Musiyano uripo pakati peSurge Protective Device neOvervoltage Protector

Zvidziviriro zvekudzivirira mafungu nezvinodzivirira mafungu zvinoshandisa magetsi akawanda (overvoltage protectors) zvinhu zviviri zvinoshandiswa zvakanyanya pakudzivirira magetsi. Zvinogona kuderedza kana kuburitsa mafungu anodarika mumagetsi uye kudzivirira kuti magetsi asakuvadzwe nemheni kana zvimwe zvikonzero. Zvisinei, misimboti yavo yekushanda, zviratidzo zvekushanda, mamiriro ekushandiswa uye mwero wenyika zvakasiyana. Chinyorwa chino chichaenzanisa nekuongorora zvinodzivirira mafungu nezvinodzivirira mafungu kubva muzvinhu izvi zvina kuitira kuti vaverengi vagone kusarudza nekushandisa michina iyi miviri yekudzivirira nemazvo.

Chishandiso Chinodzivirira Kukwira (SPD) mudziyo wemagetsi une voltage shoma unoshandiswa mumasisitimu ekugovera magetsi ane voltage shoma kuderedza overvoltage instantaneous uye discharge surge current. Chikamu chayo chikuru i zinc oxide varistor (Metal Oxide Varistor, MOV), ine nonlinear voltage-current characteristics, kureva kuti, kana voltage inoshandiswa yakaderera pane threshold yayo, resistance yayo yakanyanya uye hapana current inopfuura; Kana voltage inoshandiswa iri pamusoro pe threshold yayo, resistance yayo inoderera nekukurumidza, ichipfuura current yakawanda. Nenzira iyi, kana overvoltage ikaitika instantaneous mu power grid, surge protector inokurumidza kuvhura uye ichiburitsa overvoltage kune ground line, nokudaro ichidzivirira michina yemagetsi inotevera.

Overvoltage Protector (OVP) mudziyo unogona kudzima magetsi otomatiki uye nekukurumidza. Chikamu chayo chikuru ivoltage sensor (Voltage Sensor), iyo inogona kuona shanduko dzevoltage mu power grid uye yakabatana necontrol circuit. Kana voltage iri mu power grid ikapfuura nzvimbo yakatarwa, control circuit ichaita kuti switch idimbure magetsi, nokudaro ichidzivirira michina yemagetsi inotevera.