TDM 1.2-30-300-W1與基波鐵磁諧振的條件相類似，可以得出產(chǎn)生第K次諧波諧振的條件是電路中的非線性電感的第K次諧波初始感抗大于或接近于第K次諧波容抗，即：KwL>1/KwC或?qū)懗蓋 電感壓降與電流的夾角大于90°時，非線性電感呈現(xiàn)為負阻抗性質(zhì)，它不但不從電源吸收功率，而且相反，它相當于1臺第K次諧波頻率的發(fā)電機向電路供給功率。這就是說，諧波諧振的能量是通過電感的非線性因素轉(zhuǎn)化得來的。
4故障分析介紹電磁諧振（分頻）一般應具備如下3個條件，①鐵磁式電壓互感器（TV）的非線性效應是產(chǎn)生鐵磁諧振的主要原因。②TV感抗為容抗的100倍以內(nèi)，即參數(shù)匹配在諧振范圍。③要有激發(fā)條件，如：投入和斷開空載母線、TV突然合閘、單相接地突然消失、外界對系統(tǒng)的干擾或系統(tǒng)操作產(chǎn)生的過電壓等。由前面分析可知，本次事故中具備了全部3個條件，導致了此次事故。
經(jīng)檢查分析，太原第二熱電廠高啟變B段避雷器A相散落碳化硅電阻無過流痕跡，邊緣燒灼嚴重，放電間隙燒灼嚴重，調(diào)查老廠故障錄波器波圖后，基本判斷為過電壓原因。分析具體過程為：合609B― 1開關，因其真空泡內(nèi)觸頭彈跳，造成過電壓，TDM 1.2-30-300-W1飽和，電感參數(shù)變化，發(fā)生鐵磁諧振，路、嚴重過負荷、噴油。高啟變高壓側(cè)A相繞組瞬間對地閃絡，電壓到零20ms繼而引發(fā)A相繞組接地，100ms后，169開關跳閘，169開關A、C相噴油
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