A NEW APPLICATION OF FERRITE AND HIGH-FREQUENCY SIGNALS TO POWER-SYSTEM PROTECTION

This paper reports a new scheme where ferrite materials and high-frequ ency signals are used to detect power system faults. The ferrite acts as a broad band dissipater. The attenuation properties of ferrite bead s on high-frequency signals is studied and are then used on a 10 m lon g single-phase transmission line model to investigate their use as a p rimary detection device in a non-unit protection scheme which possesse s unit protection properties. The results show that the ferrite beads attenuate the high-frequency noise quite effectively. But the picking up of high-frequency noise has to be considered as well.