دانلود مقاله ترجمه شده شناسایی مشخصات هجومِ سمپاتیک ترنسفورمر بر اساس اطلاعات موجود در پست

Abstract

Sympathetic inrush is a magnetizing inrush phenomenon  between  two  or  more  transformers  when  one  of  them  is switched on under no load condition. This phenomenon has caused transformer differential protection maloperation in several cases due to the failure of the second harmonic  restraint algorithm. Sympathetic inrush is very different in both the mechanism  and  characteristics  from  general  inrush  generated  by  a single  transformer.  Hence  a  special  identification  method  is  required.  The  physical  mechanism  of  sympathetic  inrush  between transformers is thoroughly  studied  to  understand  its  characteristics, especially the alternate saturation feature. A substation-area information  based  identification  method  is  proposed  to  identify sympathetic  inrush  of  the  in-service  transformer  (IT).  The  alternate opposite saturation characteristic is used in the method. Both locking  and  unlocking  criteria  are  designed  for  current  differenial  protection  to  prevent  the  IT  protection  from  maloperation. The  proposed  method  is  verified  to  be  effective  under  different system conditions by simulations conducted in PSCAD and RTDS.