XYCOM XVME-957

铁磁谐振的特色
关于铁磁谐振电路，在一样的电源电势效果下，回路也许不只有一种安稳的作业状况。电路究竟安稳在哪种作业状况，要看外界冲击引起的过渡进程的状况。
TV的非线性铁磁特性是发作铁磁谐振的根本原因，但铁磁元件的饱满效应自身，也约束了过电压的幅值。此外回路损耗也使谐振过电压遭到阻尼和约束。当回路电阻大于必定的数值时，就不会呈现激烈的铁磁谐振过电压。
串联谐振电路，发作铁磁谐振过电压的的必要条件是。因而铁磁谐振可在很大的规模内发作。
保持谐振振动和赔偿回路电阻损耗的能量均由工频电源供应。为使工频能量转化为其它谐振频率的能量，其转化进程有必要是周期性，且有节律的，倍频率的谐振。
铁磁谐振对TV的损坏，铁磁谐振(分频)通常应具有如下三个条件。
1、电磁式电压互感器(TV)的非线性效应，是发作铁磁谐振的主要原因。
２、TV感抗为容抗的100倍以内，即参数匹配在谐振规模。
３、要有激起条件，如投入和断开空载母线、TV俄然合闸、单相接地俄然不见、外界对体系的搅扰或体系操作发作的过电压等。
　　由前面剖析可知，事端中具有了3个条件，才致使了这次事端。当良站10 kV体系发作单相接地时，故障点流过电容电流，未接地的两相B、C相电压增加31/2，对体系发作扰动，在这一瞬间电压骤变进程中，TV高压线圈的非接地两相的励磁电流就要俄然增大，乃至饱满，由此构成相间串联谐振。饱满后的TV励磁电感变小，体系网络对地阻抗趋于理性，此时若体系网络的对地电感与对地电容相匹配，就构成共振回路，激起各种铁磁谐振过电压。尤其是分频铁磁谐振可致使相电压低频摇摆，励磁感抗成倍降低，发作过电压，过电压幅值可到达近以上，但此过电压达不到避雷器的动作电压1.7 kV，故母线避雷器并未动作。一起，感抗降低会使励磁回路严重饱满，励磁电流急剧加大，电流大大超越额定值，据实验，分频谐振的电流可达正常电流的240倍以上，致使铁芯剧烈振动。TV是在这么大的电流下运转，使自身的温度也敏捷增加，当热量堆集到必定程度，干式TV中很多绝缘纸、绝缘介质会受热气化，体积急速胀大，而寄存绝缘纸、绝缘介质的干式互感器内部空间有限，当压强堆集到必定程度时便发作了TV。

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