傳(chuan)輸(shu)：電(dian)(dian)(dian)能(neng)(neng)(neng)的(de)(de)(de)傳(chuan)輸(shu)，它和(he)變電(dian)(dian)(dian)、配電(dian)(dian)(dian)、用電(dian)(dian)(dian)一起(qi)，構成電(dian)(dian)(dian)力系統(tong)的(de)(de)(de)整體(ti)功能(neng)(neng)(neng)。通過(guo)輸(shu)電(dian)(dian)(dian)，把相(xiang)距甚遠(yuan)的(de)(de)(de)(可(ke)達數(shu)千千米(mi))發電(dian)(dian)(dian)廠和(he)負(fu)荷(he) 中(zhong)(zhong)心起(qi)來，使(shi)電(dian)(dian)(dian)能(neng)(neng)(neng)的(de)(de)(de)開(kai)發和(he)利(li)用超越地(di)域的(de)(de)(de)限制。和(he)其(qi)他能(neng)(neng)(neng)源(yuan)的(de)(de)(de)傳(chuan)輸(shu)(如輸(shu)煤、輸(shu)油等)相(xiang)比，輸(shu)電(dian)(dian)(dian)的(de)(de)(de)損耗(hao)小、效益高、靈活方便、易(yi)于(yu)調(diao)控、環境污(wu)染(ran)少;輸(shu) 電(dian)(dian)(dian)還可(ke)以將(jiang)不同地(di)點的(de)(de)(de)發電(dian)(dian)(dian)廠連接起(qi)來，實(shi)行峰(feng)谷(gu)調(diao)節。輸(shu)電(dian)(dian)(dian)是(shi)電(dian)(dian)(dian)能(neng)(neng)(neng)利(li)用*性的(de)(de)(de)重(zhong)要(yao)體(ti)現，在現代化社會(hui)中(zhong)(zhong)，它是(shi)重(zhong)要(yao)的(de)(de)(de)能(neng)(neng)(neng)源(yuan)動脈。

  輸(shu)(shu)(shu)電(dian)(dian)(dian)(dian)(dian)線(xian)路按結構 形(xing)式可(ke)分(fen)為架空輸(shu)(shu)(shu)電(dian)(dian)(dian)(dian)(dian)線(xian)路和地(di)下輸(shu)(shu)(shu)電(dian)(dian)(dian)(dian)(dian)線(xian)路。前者(zhe)由(you)線(xian)路桿塔、導線(xian)、絕緣子等構成(cheng)(cheng)(cheng)(cheng)，架設在地(di)面(mian)上;后者(zhe)主要(yao)用(yong)電(dian)(dian)(dian)(dian)(dian)纜，敷設在地(di)下(或水下)。輸(shu)(shu)(shu)電(dian)(dian)(dian)(dian)(dian)按所(suo)送電(dian)(dian)(dian)(dian)(dian)流(liu)性(xing)質 可(ke)分(fen)為直(zhi)流(liu)輸(shu)(shu)(shu)電(dian)(dian)(dian)(dian)(dian)和交(jiao)(jiao)流(liu)輸(shu)(shu)(shu)電(dian)(dian)(dian)(dian)(dian)。19世紀80年代首先成(cheng)(cheng)(cheng)(cheng)功地(di)實(shi)現了(le)直(zhi)流(liu)輸(shu)(shu)(shu)電(dian)(dian)(dian)(dian)(dian)，后因受(shou)電(dian)(dian)(dian)(dian)(dian)壓(ya)提不高的(de)限(xian)制(輸(shu)(shu)(shu)電(dian)(dian)(dian)(dian)(dian)容量大體與輸(shu)(shu)(shu)電(dian)(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)(dian)壓(ya)的(de)平方(fang)成(cheng)(cheng)(cheng)(cheng)比(bi)例(li))19世紀末為交(jiao)(jiao)流(liu) 輸(shu)(shu)(shu)電(dian)(dian)(dian)(dian)(dian)所(suo)取代。交(jiao)(jiao)流(liu)輸(shu)(shu)(shu)電(dian)(dian)(dian)(dian)(dian)的(de)成(cheng)(cheng)(cheng)(cheng)功，迎(ying)來了(le)20世紀電(dian)(dian)(dian)(dian)(dian)氣化時代。20世紀60年代以來，由(you)于(yu)電(dian)(dian)(dian)(dian)(dian)力電(dian)(dian)(dian)(dian)(dian)子技(ji)術的(de)發展，直(zhi)流(liu)輸(shu)(shu)(shu)電(dian)(dian)(dian)(dian)(dian)又有(you)新發展，與交(jiao)(jiao)流(liu)輸(shu)(shu)(shu)電(dian)(dian)(dian)(dian)(dian)相配合，形(xing)成(cheng)(cheng)(cheng)(cheng)交(jiao)(jiao) 直(zhi)流(liu)混合的(de)電(dian)(dian)(dian)(dian)(dian)力系統。

  輸(shu)(shu)(shu)電電壓的高低是輸(shu)(shu)(shu)電技術(shu)發展(zhan)水平的主要標志。到20世(shi)紀90年代，世(shi)界各國常用輸(shu)(shu)(shu)電電壓有(you)220千伏及(ji)以上(shang)的高壓輸(shu)(shu)(shu)電330～765千伏的超高壓輸(shu)(shu)(shu)電，1000千伏及(ji)以上(shang)的特高壓輸(shu)(shu)(shu)電。

  變(bian)電(dian)(dian)(dian)(dian)(dian)：電(dian)(dian)(dian)(dian)(dian)力(li)系(xi)統(tong)中，發電(dian)(dian)(dian)(dian)(dian)廠將(jiang)天然的(de)(de)一次能(neng)(neng)(neng)源轉變(bian)成電(dian)(dian)(dian)(dian)(dian)能(neng)(neng)(neng)，向遠方(fang)的(de)(de)電(dian)(dian)(dian)(dian)(dian)力(li)用戶送(song)電(dian)(dian)(dian)(dian)(dian)，為(wei)了(le)減小輸電(dian)(dian)(dian)(dian)(dian)線路(lu)上的(de)(de)電(dian)(dian)(dian)(dian)(dian)能(neng)(neng)(neng)損耗及線路(lu)阻抗壓(ya)(ya)(ya)降，需要將(jiang)電(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)升(sheng)高(gao)(gao);為(wei)了(le)滿(man)足電(dian)(dian)(dian)(dian)(dian)力(li)用 戶安全的(de)(de)需要，又要將(jiang)電(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)降低(di)(di)，并分(fen)(fen)配(pei)(pei)給各(ge)個用戶，這就(jiu)需要能(neng)(neng)(neng)升(sheng)高(gao)(gao)和降低(di)(di)電(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)，并能(neng)(neng)(neng)分(fen)(fen)配(pei)(pei)電(dian)(dian)(dian)(dian)(dian)能(neng)(neng)(neng)的(de)(de)變(bian)電(dian)(dian)(dian)(dian)(dian)所。所以變(bian)電(dian)(dian)(dian)(dian)(dian)所是電(dian)(dian)(dian)(dian)(dian)力(li)系(xi)統(tong)中通過其變(bian)換電(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)、接受和分(fen)(fen)配(pei)(pei) 電(dian)(dian)(dian)(dian)(dian)能(neng)(neng)(neng)的(de)(de)電(dian)(dian)(dian)(dian)(dian)工裝置，它是發電(dian)(dian)(dian)(dian)(dian)廠和電(dian)(dian)(dian)(dian)(dian)力(li)用戶的(de)(de)中間環節(jie)，同時通過變(bian)電(dian)(dian)(dian)(dian)(dian)所將(jiang)各(ge)電(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)等級(ji)的(de)(de)電(dian)(dian)(dian)(dian)(dian)網起來，變(bian)電(dian)(dian)(dian)(dian)(dian)所的(de)(de)作用是變(bian)換電(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)，傳輸和分(fen)(fen)配(pei)(pei)電(dian)(dian)(dian)(dian)(dian)能(neng)(neng)(neng)。變(bian)電(dian)(dian)(dian)(dian)(dian)所由電(dian)(dian)(dian)(dian)(dian) 力(li)變(bian)壓(ya)(ya)(ya)器、配(pei)(pei)電(dian)(dian)(dian)(dian)(dian)裝置、二次系(xi)統(tong)及必要的(de)(de)附屬設(she)備組成。

  變壓器是變電所的中心設備，變壓器利用的是電磁感應原理。
配電(dian)裝置(zhi)(zhi)是(shi)變電(dian)所(suo)(suo)(suo)中所(suo)(suo)(suo)有的開關電(dian)器(qi)(qi)、載流導體輔助設(she)備(bei)(bei)連(lian)接(jie)(jie)在一(yi)起的裝置(zhi)(zhi)。其(qi)作用是(shi)接(jie)(jie)受和分配電(dian)能(neng)。配電(dian)裝置(zhi)(zhi)主要(yao)由母線(xian)、高壓斷路器(qi)(qi)開關、電(dian)抗器(qi)(qi)線(xian)圈、互感(gan)器(qi)(qi)、電(dian)力電(dian)容(rong)器(qi)(qi)、避雷(lei)器(qi)(qi)、高壓熔(rong)斷器(qi)(qi)、二次設(she)備(bei)(bei)及必要(yao)的其(qi)他輔助設(she)備(bei)(bei)所(suo)(suo)(suo)組成。

  二次設備是指一次系統狀態測量、控制、監察和保護的設備裝置。由這些設備構成的回路叫二次回路，總稱二次系統。
  二次系(xi)統(tong)的(de)設備包含測量裝(zhuang)(zhuang)置(zhi)、控(kong)制(zhi)裝(zhuang)(zhuang)置(zhi)、繼電保護(hu)裝(zhuang)(zhuang)置(zhi)、自動(dong)控(kong)制(zhi)裝(zhuang)(zhuang)置(zhi)、直流系(xi)統(tong)及(ji)必(bi)要的(de)附屬設備。