Abstract
Paralle l passive filters are used for decrease of harmonic co mponents of load currents. In electrical distribu- tion systems, over voltages such as switching and lightning over voltages are applied to the parallel passive filters. Th is paper analyses the behaviour of parallel passive filter employed to decrease the load harmonic currents under travelling wave conditions. The parallel passive filter is vulnerable to lightning surges. Therefore, protection of it against lightning surges is necessary. Equipment protection against lightning surges is usually done by gapless surge arrester. This paper presents important points of gapless surge arrester to protect parallel passive filters. A lso an algorith m is presented to select gapless arrester under harmonic conditions in this paper. The presented algorithm is based on the IEEE standards C62.22 and 1531. Finally the simulat ion results are provided to verify the presented algorithm.
Highlights
Discharges of lightning surges on electrical distribution lines cause electrical breakdown of insulators
If the voltage magnitude of the lightning surge is higher than Lightning Protective Level (LPL) of the insulators, the flashes are occurred on the insulators of three-phase
Design of the paralle l passive filte rs (PPFs) is based on limitation of the harmon ic currents as mentioned in standard IEEE519[1] but the details of protection of the PPFs during lightning surges are not discussed in the standard
Summary
Discharges of lightning surges on electrical distribution lines cause electrical breakdown of insulators. Concrete poles utilized in low voltage electrical systems (up to 20kV) have no grounding systems and no grounding conductors. They cannot suppress the lightening surges effectively due to their large surge impedances. The subject of[5] is estimation of heating with mixtures of fundamental and harmonic voltages in order to select an appropriate rating of arrester, but the paper does not exa mine effects of the lightening surges on paralle l passive filters. Reliability of the PPF is impo rtant too, use of surge arresters for lightning protection improve reliability of the system[6]. This paper examines equivalent surge impedance in conjunction point to analyse behaviour of travelling wave in electrical d istribution lines. There are several model for analysis of the surge arrester, such as IEEE model, Pinceti model, Popov model[7], this paper uses IEEE model of the surge arrester in simulation
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