A Model for the Ultra-saturation Phenomenon During Energization of an Unloaded Power Transformer and Its Effect on Differential Protection

作者：Noshad Bahram^*; Razaz Morteza; Seifossadat Seyed Ghodratollah

来源：Electric Power Components and Systems, 2013, 41(12): 1129-1145.

DOI：10.1080/15325008.2013.807895

• unloaded power transformer energization
• additional line
• load from supplying side
• transformer differential protection
• ultra-saturation phenomenon
• false trip

Ultra-saturation phenomenon is one of the false trips of the power transformer differential protection during unload transformer energization with additional line/load from the supplying side. This article presents, at first, a new model for investigating the ultra-saturation phenomenon during unload power transformer energization with additional line/load from the supplying side and considers its effect on the differential protection of the power transformer. In this model, the non-linear characteristic of the power transformer core and the effect of current transformer are taken into account. It is assumed that the additional line/load from the supplying side of the power transformer is a resistive and an inductive load. Also, the effect of the residual flux, inception angle, and additional line/load from the supplying side on the ultra-saturation phenomenon is investigated.

• 出版日期2013-9-10