کنفرانس منطقه ای سیرد

صفحه اصلی / یازدهمین کنفرانس منطقه ای سیرد

Evaluation of the Distance of the Bonded Instrumentation and HV GS to Reduce the Electromagnetic Interferences due to Lightning Strikes in the EMTP-RV Environment

نویسندگان :

Mahmoud Eshaghahmadi¹ Mostafa Hoorzad² Mobin Davoudi-samangani³

1- شرکت توزیع برق مشهد 2- شرکت توزیع برق مشهد 3- شرکت توزیع برق مشهد

کلمات کلیدی :

Grounding system،Instrumentation،lightning wave،overvoltage

چکیده :

The characteristics and structure of High Voltage (HV) and Low Voltage (LV, instrumentation, or clean earth) Grounding Systems (GS) are different. So they should be placed at an optimal distance so that if the lightning current is rejected from the HV GS to the clean earth, its waves will not affect the instrumentation ground. The conduction of the lightning current wave and the fault current to the ground is associated with an increase in the voltage of the conductive part of the connection of this system to the local ground reference. Therefore, GSs are inherently prone to noise. Reducing the incidence of noise interference in instrumentation systems by creating joint surfaces with low relative impedance between devices, circuits, and equipment is one of the main goals of GSs. The voltage wave in the buried electrodes of the GS creates potential levels that are eventually dumped. The impact of lightning current in the substation environment through the path of closed current loops can cause the misperformance of sensitive equipment. In this paper, with suitable modeling of low voltage and sensitive electronic equipment, the effect of lightning current on the lightning protection GS, the amount of injected current and, voltage Induction to GSs of bonded instrumentation and HV GS is investigated. The parameters affecting the induced voltage, such as the shape of the electrodes, and the soil resistivity are also investigated. All the simulations of this paper have been done in the EMTP-RV environment.