Protection of harmonic filter banks

Power quality is an important consideration for grid operators and large industrial power users who face different network challenges. Grid operators are challenged with minimizing losses over long transmission lines, integrating renewable generation (e.g., wind, solar) and providing voltage support during unplanned network events are critical in delivering efficient and reliable grids. Large industrial power consumers face the challenge of lower operating costs as well as meeting contractual conditions related to power factor and harmonic distortion to secure electrical supply. HV harmonic filter banks are then often used in order to remove harmonics from the modern power network. This paper describes protection principles and schemes which can be applied on such HV harmonic filter banks, as well as provide guidance to protection engineers.