SIMULATION TEST AND COMPUTATION OF SUPPRESSING VERY FAST TRANSIENT OVERVOLTAGE IN GIS BY MAGNETIC RINGS

作者：Shuping Wang · 发表于：Proceedings of the CSEE · 年份：2005 · 被引用次数：9 · 研究领域：Lightning and Electromagnetic Phenomena、Thermal Analysis in Power Transmission、High-Voltage Power Transmission Systems

Very fast transient overvoltages (VFTO) are generated during the switching of disconnectors in gas insulated substation (GIS). Such overvoltages can cause faults on GIS and other components. Some Suppressing methods have been used but each has some shortages. Suppressing very fast transient in GIS by magnetic rings was researched. The high voltage simulation test validated that using magnetic rings to suppress VFTO is distinctly efficient. Jiles-Atherton model was applied to the simulation of magnetic rings. The saturation, hysteresis and loss characteristic of magnetic material were taken in this model. Simulation results for the test circuit accorded with the test and the model were validated. Analyze of dynamic magnetization process under the VFTO showed that the magnetic rings store and dissipate the energy of traveling wave. As a result, the peak value and gradient of VFTO are depressed and attenuation is accelerated. This model was also used in the VFTO simulated computations of Dayawan GIS system, and the results showed that the VFTO is distinctly suppressed by magnetic rings.