Open AccessNew optical differential protection algorithm applied in bus protection
Author(s) -
Sitong Zhu,
Tongwei Yu,
Yong Ying,
Zhenyang Zhao,
Dan Zhao
Publication year - 2019
Publication title -
the journal of engineering
Language(s) - English
Resource type - Journals
ISSN - 2051-3305
DOI - 10.1049/joe.2018.8805
Subject(s) - differential protection , current transformer , transformer , computer science , waveform , algorithm , fault (geology) , current (fluid) , electronic engineering , electrical engineering , engineering , voltage , seismology , geology
In order to improve the speed and reliability of bus protection, people put forward the optical current transformer (OCT) replaced the traditional electric–magnetic current transformer. As OCT has no magnetic saturation, no band limits, and can accurately and quickly transform the full‐waveform current signal in principle, the authors put forward a new optical differential protection algorithm which directly use the integral values of the operating current and the restraint current measured by OCT as the differential protection algorithm. The authors build 220 kV double bus protection model and simulate the actual fault current signal by Real Time Digital Simulator (RTDS). Then, the authors bring the fault current into the bus protection algorithm for verification, and analyse the simulation curves of restraint ratio. The simulation results prove the feasibility of the optical differential protection algorithm.