TY - JOUR N2 - An intelligent boundary switch is a three-phase outdoor power distribution device equipped with a controller. It is installed at the boundary point on the medium voltage overhead distribution lines. It can automatically remove the single-phase-to-ground fault and isolation phase-to-phase short-circuit fault. Firstly, the structure of an intelligent boundary switch is studied, and then the fault detection principle is also investigated. The single-phase-to-ground fault and phase-to-phase short-circuit fault are studied respectively. A method using overcurrent to judge the short-circuit fault is presented. The characteristics of the single-phase-to-ground fault on an ungrounded distribution system and compositional grounded distribution system are analyzed. Based on these characteristics, a method using zero sequence current to detect the single-phase-to-ground fault is proposed. The research results of this paper give a reference for the specification and use of intelligent boundary switches. L1 - http://www.journals.pan.pl/Content/112892/PDF/14_AEE-2019-3_INTERNET.pdf L2 - http://www.journals.pan.pl/Content/112892 PY - 2019 IS - No 3 EP - 666 DO - 10.24425/aee.2019.129348 KW - fault detection KW - boundary switch KW - distribution grid A1 - Liu, Ling PB - Polish Academy of Sciences VL - vol. 68 DA - 2019.09.09 T1 - Fault detection technology for intelligent boundary switch SP - 657 UR - http://www.journals.pan.pl/dlibra/publication/edition/112892 T2 - Archives of Electrical Engineering ER -