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second harmonic restrain
相关语句
  相似匹配句对
     Second .
     二、破自造论。
短句来源
     Second,
     二是对于?
短句来源
     On the Nondiffvacting Second Harmonic Beam
     非衍射的二次谐波
短句来源
     THE DIFFRACTION AND WALKOFF IN THE SECOND HARMONIC GENERATION
     二次谐波转换中的衍射和离散效应
短句来源
     The simulation of the scheme of second harmonic restraint for power transformer
     变压器差动保护二次谐波制动判据的仿真研究
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The analysis of frequency spectrum for single transformer inrush indicates that the phase difference between fundamental wave and second harmonic phasor is equal 0o or 180o.An adaptive second harmonic amplitude and phase restraint scheme is put forward to avoid malfunction under inrush conditions. The amplitude and phase information in the inrush waveform is fully used in scheme. The simulation results indicated that the scheme is better than the traditional second harmonic restrain method. It will not...

The analysis of frequency spectrum for single transformer inrush indicates that the phase difference between fundamental wave and second harmonic phasor is equal 0o or 180o.An adaptive second harmonic amplitude and phase restraint scheme is put forward to avoid malfunction under inrush conditions. The amplitude and phase information in the inrush waveform is fully used in scheme. The simulation results indicated that the scheme is better than the traditional second harmonic restrain method. It will not malfunction when a transformer is energized, and it will issue a trip signal quickly when transformer with internal fault is energized.

在详细推导单相励磁涌流的傅里叶级数表达式基础上,分析出涌流波形中各次谐波之间满足一定的相位关系,即单相涌流中基波相位与2次谐波相位差为0°或180°,由此提出了一种基于附加相位判别的自适应2次谐波励磁涌流制动方案。该方案充分利用涌流波形中的幅值相位信息,改善了某些涌流不明显情况下传统2次谐波制动原理的不足,同时空投变压器内部故障时也不会误闭锁差动保护。各种情况下的仿真与动模数据的测试结果表明:自适应附加相位制动方案的差动保护比传统2次谐波判据性能优良,且有较好的实际工程应用价值。

The adaptive second harmonic restrained method used in T60 of GE transformer protection device was discussed in this paper.This algorithm was deduced from single transformer but it is not suitable for three winding transformer.When energizing an unload Y0/△-11 connection transformer on Y0 side,the circulating current in delta side may eliminate or distort inrush current waveforms on Y0 side.This kind of elimination effect phenomenon in inrush current is called the affection of add-assist current(AA)in...

The adaptive second harmonic restrained method used in T60 of GE transformer protection device was discussed in this paper.This algorithm was deduced from single transformer but it is not suitable for three winding transformer.When energizing an unload Y0/△-11 connection transformer on Y0 side,the circulating current in delta side may eliminate or distort inrush current waveforms on Y0 side.This kind of elimination effect phenomenon in inrush current is called the affection of add-assist current(AA)in inrush.It will cause the property of inrush different from single transformer inrush and different compensation method for differential protection also has effect on the amplitude and angle of second harmonic in inrush current.The different connection type for transformer and different compensation method should be considered in differential protection.The further research results show that the characteristic of current in magnetic branch is same as single transformer.The adaptive second harmonic restrained method was suggested if the winding differential protection scheme was used while the CT was mounted on the inner side of △ winding.The sensitivity of protection will also be improved by using this scheme.

探讨了GE变压器保护中采用二次谐波附加相位制动原理的适用范围,该原理是从单相变压器涌流特征分析而得到的,但在三相变压器中并不一定完全适用。如对于Y0/?-11接线的变压器,Y0侧空载合闸时由于?绕组中环流助增的影响,引起Y0侧涌流波形的二次谐波幅值、相位特征将不完全同于单相变压器。若保护采用不同的转角方式,其差电流中的二次谐波幅值与相位特征更是不同,论文研究指出基于二次谐波相位的励磁涌流判别方法应充分考虑变压器的接线组别、差动保护的实现原理等的影响。同时研究发现三相分体的变压器各相励磁支路的涌流波形基本上和单相涌流特征相同,如能测量在△侧绕组中的电流并采用两侧绕组电流作为差动臂,那么空载合闸时差动电流就等于励磁支路的电流,同时还能提高区内故障的灵敏度,并且适合采用附加相位制动原理来识别涌流。

The condition that the phase difference between fundamental harmonic and second harmonic of transformer energizing inrush current is equal to 0° or 180° is analyzed, the conclusion of the analysis is verified by the inrush current waveforms obtained by simulation of ideal single-phase transformer and three-phase transformer as well as that from dynamic simulation. On this basis an improved second harmonic restrained method that can comprehensively distinguish the energizing inrush current...

The condition that the phase difference between fundamental harmonic and second harmonic of transformer energizing inrush current is equal to 0° or 180° is analyzed, the conclusion of the analysis is verified by the inrush current waveforms obtained by simulation of ideal single-phase transformer and three-phase transformer as well as that from dynamic simulation. On this basis an improved second harmonic restrained method that can comprehensively distinguish the energizing inrush current by use of amplitude and phase relations between fundamental harmonic and second harmonic is proposed. The transformer differential protection applying the proposed method is evidently superior to traditional transformer differential protection based on second harmonic restrained criteria, so the proposed method is available for engineering application.

分析了变压器励磁涌流波形中基波与二次谐波相位差的关系,二者满足0°或180°的相位关系,并通过对理想单相变压器仿真、三相变压器仿真、动模试验得到的涌流波形的分析验证了此结论,据此提出了一种利用二次谐波与基波之间幅值和相位关系综合判别励磁涌流的改进型二次谐波制动方法,应用该方法的差动保护明显优于采用传统二次谐波制动判据的保护,具有较好的工程应用价值。

 
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