Open AccessAnalysis and Simulation of Ferroresonance Mechanism of Potential Transformer Based on Harmonic Balance Method
Author(s) -
Houlei Gao,
Peihao Yang,
C H Liu,
J S Zhang,
Teng Wu
Publication year - 2021
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/701/1/012071
Subject(s) - ferroresonance in electricity networks , overvoltage , harmonic balance , transformer , waveform , nonlinear system , control theory (sociology) , voltage , electrical engineering , engineering , computer science , physics , control (management) , quantum mechanics , artificial intelligence
In power systems with voltage levels of 66kV and below, the bus potential transformer (PT) burnout accidents frequently occur. Based on the harmonic balance method, this paper analyzes the ferromagnetic resonance mechanism, and analyzes the fault waveform recorded by the fault recording system in the 66kV substation, and obtains the possible cause of the accident. The PSCAD/EMTDC software was used to build the electromagnetic transient model, and the PT burnout process was restored. It is concluded that the main cause of the accident is the ferromagnetic resonance overvoltage caused by the saturation of the PT iron core. Three solutions are also proposed, the PT primary side neutral point ground by nonlinear resistance, open triangle of PT short-time access a little resistance, and PT with better excitation characteristics are selected. The feasibility of the solutions is verified by simulation.