Ferro-Resonance Analysis of Capacitor Voltage Transformer with Fast Saturation Damper

• Main Authors: Ding, X. (Author), Li, D. (Author), Liu, B. (Author), Wang, W. (Author), Wang, X. (Author), Yang, K. (Author), Zhang, J. (Author)
• Format: Article
• Language: English
• Published: MDPI 2022
• Subjects: capacitor voltage transformer; Capacitor voltage transformer; Electric fault currents; Electric power system interconnection; Electric power transmission networks; fast saturation damper; Fast saturation damper; ferromagnetic resonance; harmonic; Insulation level; mechanism; Operation life; Power networks; Power transformers; Regional power grids; Resonance; Resonance analysis; Spectrum analysis; Time switching; Transformer impedances; Transient oscillations; Variable speed transmissions; Vibration analysis
• Online Access: View Fulltext in Publisher

 With the increase in capacitor voltage transformer (CVT) operation life, CVT impedance changes, and the short-time switching of overhead lines, it is very easy to cause a transient oscillation accident in which a CVT participates, reduce the insulation level of a CVT, and even induce regional power grid oscillation and easily cause capacitor breakdown, after long-term operation with defects. In this paper, the whole power network, including the generator, power grid, and consumer, is modeled, and the theoretical model of the CVT ferro-resonance connected grid is built. The frequency spectrum analysis, and the measurements of resonance bus voltage and line voltage, were carried out to find the design method of a fast saturation damper (FSD) and its voltage–current characteristics that affect the vibration, based on theory and practice; this paper puts forward effective measures to reduce the resonance effect of a CVT in operation, and avoid the oscillation of the line and even the regional power grid system. © 2022 by the authors. Licensee MDPI, Basel, Switzerland.