格式:pdf
大小:1.8MB
頁數(shù): 3頁
不少地方由于電網(wǎng)供電不穩(wěn)(包括雷電引起的電網(wǎng)電壓瞬間增大)或錯(cuò)相(220V照明電壓變成380V動力電壓),造成家用電器過壓燒毀的事故屢有發(fā)生。為此,筆者巧用一只壓敏電阻器將普通單相漏電斷路器改造成了過壓、漏電雙功能斷路器。為了避免家里或機(jī)關(guān)單位、學(xué)校等處的交流用電設(shè)備不因電網(wǎng)過電壓而損壞,何不趕快動手一試!
格式:pdf
大小:830KB
頁數(shù): 12頁
& ? & ? '= /(7 ? & ? '= /(7 ? & ? 3 3 3 1 3'= /(71 & '= /(71 & '= /(71 & '= /(71 & '= /(71 & '= /(71 & '= /(70 & '= /(70 & '= /(71 & '= /(71 & '= /(71 & '= /(71 & '= /(71 & '= /(71 & '= /(71 & '= /(70 & '= /(70 & '= /(71 & '= /(71 & '= /(71 & '= /(71 & '= /(71 & '= /(71 & '= /(71 & '= /(70 & '= /(70 & '= /(71 & '= /(71 & '= /(71 & '= /(71 & '= /(71 & '= /(71 & '= /(71 & '= /(70 & '= /(70 & '=