25C-D030N104 一、 斷線故障
如果一相斷線但未接地，或斷路器、隔離開關一相未接通，電壓互感器保險絲熔斷均造成三相參數不對稱。上一電壓等級線路一相斷線時，下一電壓等級的電壓表現為三個相電壓都降低，其中一相較低，另兩相較高但二者電壓值接近。本級線路斷線時，斷線相電壓為零，未斷線相電壓仍為相電壓。
二、接地故障
當線路一相斷線并單相接地時，雖引起三相電壓不平衡，但接地后電壓值不改變。單相接地分為金屬性接地和非金屬性接地兩種。金屬性接地，故障相電壓為零或接近零，非故障相電壓升高1.732倍，且持久不變；非金屬性接地，接地相電壓不為零而是降低為某一數值，其他兩相升高不到1.732倍。
諧振原因 隨著工業的飛速發展，非線性電力負荷大量增加，某些負荷不僅產生諧波，還引起供電電壓波動與閃變，甚至引起三相電壓不平衡。諧振引起三相電壓不平衡有兩種：
一種是基頻諧振，特征類似于單相接地，即一相電壓降低，另兩相電壓升高，查找故障原因時不易找到故障點，此時可檢查特殊用戶，若不是接地原因，可能就是諧振引起的。
另一種是分頻諧振或高頻諧振，特征是三相電壓同時升高。
另外，還要注意，空投母線切除部分線路或單相接地故障消失時，如出現接地信號，且一相、兩相或三相電壓超過線電壓，電壓表指針打到頭，并同時緩慢移動，或三相電壓輪流升高超過線電壓，遇到這種情況，一般均屬諧振引起。
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