變電(dian)(dian)站(zhan)，改變電(dian)(dian)壓的場所。為了把(ba)(ba)發電(dian)(dian)廠(chang)發出(chu)來(lai)的電(dian)(dian)能輸送(song)到(dao)較(jiao)遠(yuan)的地方，必須把(ba)(ba)電(dian)(dian)壓升高，變為高壓電(dian)(dian)，到(dao)用戶(hu)附近再按需要把(ba)(ba)電(dian)(dian)壓降低，這種升降電(dian)(dian)壓的工(gong)作靠變電(dian)(dian)站(zhan)來(lai)完(wan)成。變電(dian)(dian)站(zhan)的主要設(she)備是開關(guan)和變壓器(qi)。