電網頻率
我國電(dian)(dian)(dian)力系(xi)統(tong)的(de)標稱頻率為(wei)50Hz ，GB/T15945-2008《 電(dian)(dian)(dian)能質量(liang) 電(dian)(dian)(dian)力系(xi)統(tong)頻率偏差(cha)(cha)》中規定(ding)：電(dian)(dian)(dian)力系(xi)統(tong)正常運行條件(jian)下 頻率偏差(cha)(cha)限(xian)(xian)(xian)值為(wei)±0.2Hz，當 系(xi)統(tong)容(rong)量(liang)較小時，偏差(cha)(cha)限(xian)(xian)(xian)值可以放寬(kuan)到(dao)±0.5Hz，標準(zhun)中沒有說明系(xi)統(tong)容(rong)量(liang)大小的(de)界(jie)限(xian)(xian)(xian)。三相電(dian)(dian)(dian)能質量(liang)分析儀在《 全國供用(yong)電(dian)(dian)(dian)規則(ze)》中規定(ding)"供電(dian)(dian)(dian)局供電(dian)(dian)(dian)頻率的(de)允許偏差(cha)(cha)：電(dian)(dian)(dian)網容(rong)量(liang)在300萬(wan)千(qian)瓦及以上者為(wei)±0.2HZ；電(dian)(dian)(dian)網容(rong)量(liang)在300萬(wan)千(qian)瓦以下者，為(wei)±0.5HZ。實際(ji)運行中，從全國各大電(dian)(dian)(dian)力系(xi)統(tong)運行看都保持在不大于± 0.1HZ范圍(wei)內。

電壓偏差
GB/T 12325-2008 《電(dian)(dian)能質量 供(gong)(gong)電(dian)(dian) 電(dian)(dian)壓(ya)偏差》中規(gui)定(ding)：35kV及以上供(gong)(gong)電(dian)(dian)電(dian)(dian)壓(ya)正、負偏差值之和不超過 標(biao)稱電(dian)(dian)壓(ya)的(de)10%；20kV及以下(xia) 三(san)相(xiang)供(gong)(gong)電(dian)(dian)電(dian)(dian)壓(ya)允許偏差為標(biao)稱電(dian)(dian)壓(ya)的(de)土(tu)7%；220V單(dan)相(xiang)供(gong)(gong)電(dian)(dian)電(dian)(dian)壓(ya)允許偏差為標(biao)稱電(dian)(dian)壓(ya)的(de)+7%，－10%。

三相電壓不平衡
GB/T15543-2008《電能質量 三相電壓不平衡》中規定：電力系統 公共連接點電壓不平衡度限值為：電網正常運行時， 電能質量分析儀負序電(dian)壓(ya)不(bu)平(ping)衡度不(bu)超(chao)過(guo)2%，短時不(bu)得(de)超(chao)過(guo)4%；低壓(ya)系統 零序電(dian)壓(ya)限值(zhi)暫(zan)不(bu)做規定，但(dan)各 相電(dian)壓(ya)必須滿足GB/T 12325的(de)要(yao)求。接(jie)于(yu)公共連接(jie)點的(de)每個用戶引起(qi)該點負序電(dian)壓(ya)不(bu)平(ping)衡度允許值(zhi)一(yi)般為1.3%，短時不(bu)超(chao)過(guo)2.6%。

公用電網諧波
GB/T14549--93《電(dian)(dian)能(neng)質量- 公(gong)用電(dian)(dian)網諧(xie)(xie)波》中規定：6～220kV各級(ji)公(gong)用電(dian)(dian)網電(dian)(dian)壓(ya)( 相電(dian)(dian)壓(ya)) 總(zong)諧(xie)(xie)波畸變率(lv)是(shi)0.38kV為(wei)5.0%，6～10kV為(wei)4.0%，35～66kV為(wei)3.0%，110kV為(wei)2.0%；用戶注入(ru)電(dian)(dian)網的(de) 諧(xie)(xie)波電(dian)(dian)流允許值應保證(zheng)各級(ji)電(dian)(dian)網 諧(xie)(xie)波電(dian)(dian)壓(ya)在(zai)限(xian)值范圍(wei)內，所(suo)以(yi)國標規定各級(ji)電(dian)(dian)網 諧(xie)(xie)波源(yuan)產(chan)生的(de)電(dian)(dian)壓(ya)總(zong)諧(xie)(xie)波畸變率(lv)是(shi)：0.38kV為(wei)2.6% ， 6～10kV為(wei)2.2%，35~66kV為(wei)1.9%，110kV為(wei)1.5%。對220kV電(dian)(dian)網及其(qi)供電(dian)(dian)的(de)電(dian)(dian)力用戶參照本標準110kV執行。

波動和閃變
GB/T 12326-2008《電(dian)能質量 電(dian)壓波動(dong)和(he) 閃變(bian)》規定：電(dian)力系統公共連(lian)接點，在系統正常運行的較小方式(shi)下，以一(yi)周（168h）為測量周期，所有長時間(jian)閃變(bian)值Plt滿(man)足：≤110kV，Plt=1；>110kV，Plt=0.8。