配电变压器选用D，ynll联接的优越性剖析

Analysis of the Advantages for Using This Distribution Transformers Connected with D,ynll

针对Ｄ，ｙｎｌｌ联接和Ｙ，ｙｎＯ联接两种配电变压器所具有不同的电路联接系统对三相磁路系统产生的不同影响进行分析比较，说明在单相短路故障切除、抑制３ｎ次谐波电流以及承受单相不平衡负荷的能力方面，Ｄ，ｙｎｌｌ联接的变压器均显著优于Ｙ，ｙｎＯ联接的变压器。

In this paper,the two distribution transformers connected respectively withD,ynll and Y,ynO are analysed and contrasted,since they have different connected electriccircuit system to form different effect againist the three-phase magnetic circuit system. It ispresented that D,ynll connection transformers are more advanced clearly than Y,yn O connection tranoformers,in what to interrupt single-phase short circuit faults,check 3n frequency harmonical current and bear the capacity of single-phase unbalanced load.