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首页> 外文会议>2014 Intemational Conference of Lighbling Protection >Experimental research of disconnector under large power frequency current
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Experimental research of disconnector under large power frequency current

机译：大工频电流下隔离开关的实验研究

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Research experiment has been carried out to SPD disconnector for its performance under power frequency large current (the low temperature soldering machine is the disconnecting mode for the SPD), and it is found: 1) When the current reaches 50A, varistor chip will be short-circuited prior to the activation of disconnector, and when the current reaches 300A, 100% probability of occurrence; 2) Once the varistor chip is short-circuited first, the success rate for disconnector to disconnect is greatly reduced; 3) For short circuit of varistor chip, flashing is an important cause of greatly reduced success rate; 4) When the current reaches 300A, varistor chip can withstand 28ms averagely before being short-circuited; 5) Within the above-mentioned withstand period of time, the opening time, closing time and on-time of varistor chip under different currents maintain high consistency, remaining relatively stable in the power frequency half-wave the one just before varistor chip short-circuited. Finally, if the low temperature solder mechanical separation method is applied to the protected circuit which has the greater prospective short-circuit current, the technical problems of varistor short-circuited need to be solved, thus, the technical thought that enhancing the safety of SPD under power frequency overvoltage by adopting overvoltage detection and control contact on-off is put forward.
机译：针对SPD隔离开关在工频大电流下的性能进行了研究实验（低温焊接机是SPD的隔离模式），发现：1）当电流达到50A时，压敏电阻片会短路-在隔离开关启动之前进行电路连接，并且当电流达到300A时，发生概率为100％； 2）先将压敏电阻片短路，大大降低了隔离开关断开的成功率； 3）对于压敏电阻芯片短路，闪烁是大大降低成功率的重要原因； 4）当电流达到300A时，压敏电阻芯片在短路之前平均可以承受28ms的时间； 5）在上述耐受时间内，压敏电阻片在不同电流下的开通时间，闭合时间和导通时间保持较高的一致性，在工频半波中刚好是压敏电阻片短路之前的一半保持相对稳定。电路。最后，如果将低温焊料机械分离方法应用于具有较大预期短路电流的受保护电路，则需要解决压敏电阻短路的技术问题，从而提高SPD安全性的技术思想。提出了在工频过电压下采用过电压检测和控制触头通断的方法。

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