SPD(Chida Choteteza Kuthamanga, choteteza kugwedezeka) chimagwiritsidwa ntchito makamaka popewa kugwedezeka kwamagetsi kosakhalitsa komwe kumachitika chifukwa cha kugunda kwa mphezi kapena ntchito zosinthira ma gridi kuchokera ku zida zowononga. Mitengo ndi malo oyenera a SPDS opangidwa ndi zipangizo ndi mapangidwe osiyanasiyana amasiyana.

Gawo lodziwika bwino la SPD ndi zinc oxide varistor (MOV), yomwe ndi yotsika mtengo ndipo imayankha mwachangu. Imagwiritsidwa ntchito kwambiri poteteza nyumba zogona, nyumba zamalonda, makabati ogawa ndi zida zamafakitale. Mtengo wa MOV type SPD wa kugawa kwamagetsi otsika nthawi zambiri umachokera pa makumi mpaka mazana a yuan.

SPD pogwiritsa ntchito machubu otulutsa mpweya (GDT) ili ndi mphamvu yayikulu yonyamula mafunde amphamvu komanso mphamvu yoteteza mafunde amphamvu, ndipo ndi yoyenera kuteteza mafunde ofooka a mafunde amphamvu m'malo olumikizirana, malo osungira deta, machitidwe achitetezo, ndi zina zotero. Mtengo wake nthawi zambiri umakhala wokwera kuposa wa zinthu wamba za MOV.

Zogulitsa zapamwamba za SPD zidzakhala ndi kapangidwe kophatikizana ka MOV+GDT. Zogulitsa zina zilinso ndi zida zoyendera kutentha, zowonetsa zolakwika ndi ntchito za alamu yakutali, zomwe zimapereka chitetezo chapamwamba komanso kudalirika. Ndizoyenera malo ofunikira monga zipatala, makina amagetsi, mayendedwe a sitima, malo opangira magetsi a photovoltaic ndi makina owongolera ma automation amafakitale, ndi mitengo kuyambira ma yuan mazana angapo mpaka zikwi zingapo.

Pa nyumba zaofesi wamba, nyumba zogona ndi masitolo, SPDS yamtundu wa MOV yokhazikika ikhoza kusankhidwa. Pa madera omwe mphezi zimachitika pafupipafupi, zipinda zolumikizirana, malo osungira deta ndi mapulojekiti ofunikira amafakitale, ndikulimbikitsidwa kusankha SPDS yokhala ndi mphamvu yophatikizana kapena yapamwamba kuti iwonjezere chitetezo cha mphezi ndi mphamvu zoteteza mphamvu zamagetsi ambiri ndikuwonetsetsa kuti zida zikugwira ntchito bwino kwa nthawi yayitali.

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