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鐵磁諧振的特色
關於鐵磁諧振電路，在一樣的電源電勢效果下，回路也許不只有一種安穩的作業狀況。電路究竟安穩在哪種作業狀況，要看外界衝擊引起的過渡進程的狀況。
TV的非線性鐵磁特性是發作鐵磁諧振的根本原因，但鐵磁元件的飽滿效應自身，也約束了過電壓的幅值。此外回路損耗也使諧振過電壓遭到阻尼和約束。當回路電阻大於必定的數值時，就不會呈現激烈的鐵磁諧振過電壓。
串聯諧振電路，發作鐵磁諧振過電壓的的必要條件是。因而鐵磁諧振可在很大的規模內發作。
保持諧振振動和賠償回路電阻損耗的能量均由工頻電源供應。為使工頻能量轉化為其它諧振頻率的能量，其轉化進程有必要是周期性，且有節律的，倍頻率的諧振。
鐵磁諧振對TV的損壞，鐵磁諧振(分頻)通常應具有如下三個條件。
1、電磁式電壓互感器(TV)的非線性效應，是發作鐵磁諧振的主要原因。
２、TV感抗為容抗的100倍以內，即參數匹配在諧振規模。
３、要有激起條件，如投入和斷開空載母線、TV俄然合閘、單相接地俄然不見、外界對體係的攪擾或體係操作發作的過電壓等。
由前面剖析可知，事端中具有了3個條件，才致使了這次事端。當良站10 kV體係發作單相接地時，故障點流過電容電流，未接地的兩相B、C相電壓增加31/2，對體係發作擾動，在這一瞬間電壓驟變進程中，TV高壓線圈的非接地兩相的勵磁電流就要俄然增大，乃至飽滿，由此構成相間串聯諧振。飽滿後的TV勵磁電感變小，體係網絡對地阻抗趨於理性，此時若體係網絡的對地電感與對地電容相匹配，就構成共振回路，激起各種鐵磁諧振過電壓。尤其是分頻鐵磁諧振可致使相電壓低頻搖擺，勵磁感抗成倍降低，發作過電壓，過電壓幅值可到達近以上，但此過電壓達不到避雷器的動作電壓1.7 kV，故母線避雷器並未動作。一起，感抗降低會使勵磁回路嚴重飽滿，勵磁電流急劇加大，電流大大超越額定值，據實驗，分頻諧振的電流可達正常電流的240倍以上，致使鐵芯劇烈振動。TV是在這麼大的電流下運轉，使自身的溫度也敏捷增加，當熱量堆集到必定程度，幹式TV中很多絕緣紙、絕緣介質會受熱氣化，體積急速脹大，而寄存絕緣紙、絕緣介質的幹式互感器內部空間有限，當壓強堆集到必定程度時便發作了TV。
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