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|  | | 为了更好的帮助您理解掌握查询词或其译词在地道英语中的实际用法,我们为您准备了出自英文原文的大量英语例句,供您参考。 | |
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| | The ability of zero sequence relay against transient resistance under different running conditions is analyzed in detail.Theoretically,zero sequence relay has very strong ability against transient resistance.The ability against transient resistance of zero sequence relay,when it is installed on the transmission line of unilateral power system,is different from that when installed on the sending or receiving end of bilateral power system. The value of transient resistance directly influences the performan... | | 详尽地分析了零序电抗继电器在各种运行方式下的抗过渡电阻能力 ,零序电抗继电器在理论上具有非常强的抗过渡电阻的能力。零序电抗继电器安装于单侧电源系统 ,双侧电源系统送电端、受电端时具有不同的抗过渡电阻能力 ,过渡电阻的大小直接影响着零序电抗继电器的动作行为。在数学分析基础上 ,提出了相应的改进方案 :ArgA角度判据法、快速测距法、检测电流方向法和U ″φ 判据法 ,这些方法使得零序电抗继电器在各种情况下都具有较大的抗过渡电阻能力 | | 文摘来源 | | ) The voltage transfer ratio in matrix converters can be enhanced by reducing the semiconductor switching interval,but this also reduces the waveform quality.An RB-IGBT drive circuit was developed to reduce the switching intervals and restrain the increase of the collector current stress as well as the collector-toemitter voltage stress using 3-stage control method.Then,a 3-phase to 3-phase matrix converter was built based on 600 V/100 A RB-IGBT to drive an induction motor.The commutation technique is a key... | | 矩阵式变换器技术中缩短器件开关时间可有效提高电压利用率和波形质量。该文提出一种新颖的RB-IGBT驱动电路。通过三段驱动方法在缩短开关时间的同时可以有效抑制电压、电流应力的增加。在此基础上,使用600V/100A的RB-IGBT实现了一台三相/三相矩阵式变换器样机,用于驱动一台三相异步电机。换流技术是矩阵变换器技术中一个关键问题。传统基于电流方向的四步换流策略采用电流霍尔检测电流方向,在小电流情况下准确性低。该文检测器件集射极电压确定输出电流方向,并据此实现四步换流。实验证明,该方法电流方向判断准确性远高于传统方法,同时成本大幅度降低,可靠性得到很大提高。 | | 文摘来源 | |   |
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