Numerical Simulation and Experimental Research on Vibration Characteristics of Dry-type Iron-core Reactor

Vibration is one of the key factors affecting the running status of dry-type iron-core reactor. The influences of structural components such as clamping structure and supporting pads are taken into account, and the three-dimensional transient electromagnetic-structural multi-physics simulation of 10 kV dry-type iron-core reactor based on finite element method is realized in the paper. The vibration displacement and velocity distribution of reactor under the combined influences of magnetostrictive force, Maxwell force and Lorentz force are studied. The simulation results show that, under normal operating conditions, the vibration displacement and speed of the clamping structure of the dry-type iron core reactor are significantly greater than those of other parts, especially the core screws which are used to fix the windings. Then, combined with the modal simulation analysis of the dry-type core reactor, its modal characteristics and inherent frequencies are obtained in the paper, and its vibration mechanism is further analyzed. Finally, the vibration characteristics of a 10 kV dry-type iron-core reactor are measured with a Doppler laser vibration meter. The test results show that the vibration frequency of the dry-type iron-core reactor is mainly 100 Hz and its multiples, the vibration response at 300 Hz is the most significant, which is relatively close to its inherent frequency, and there is a risk of resonance. At the same time, the test results are in good agreement with the simulation results, which verifies the workability and validity of the simulation analysis method proposed in the paper.