Open AccessDesign and Evaluation of a DSP Based Differential Relay of Power Transformer
Author(s) -
Abdelkader Abdelmoumene,
Rachid Bouderbala,
Hamid Bentarzi
Publication year - 2021
Publication title -
algerian journal of signals and systems
Language(s) - English
Resource type - Journals
eISSN - 2676-1548
pISSN - 2543-3792
DOI - 10.51485/ajss.v1i1.20
Subject(s) - inrush current , relay , differential protection , digital protective relay , protective relay , transformer , computer science , electronic engineering , control theory (sociology) , differential (mechanical device) , fault (geology) , electrical engineering , power (physics) , engineering , voltage , artificial intelligence , physics , control (management) , quantum mechanics , aerospace engineering , seismology , geology
The problem of mal operation of differential protection of power transformer due to the inrush magnetizing current has long considered as a challenging problem. Several types of protection relays have been used to solve the issue (basic relay, percentage relay, multi slop ….). Each of them has its advantage and its limits. In this paper, a Digital differential relay has been developed and simulated. The logic used to distinguish between the inrush current and the internal fault is based on the theory of harmonic analysis. The behavior of the presented relay has been simulated versus various situations (inrush current, internal fault and external fault). The obtained results show that the proposed algorithm provides a good discrimination and a fast action.