Surge Protection Device (SPD) effect of different design of grounding system

Saad, Shafri (2017) Surge Protection Device (SPD) effect of different design of grounding system. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

This study is about the impact of the difference value of grounding impedance for surge protection device (SPD) in the low voltage system. High grounding impedance will reduce effectiveness of the surge current to flow through earth which increase possibility users and equipment exposed to surge current. The important characteristics when to choose SPD is the SPD voltage protection level (Up) must be less or equal to equipment withstand voltage (Uw). This study also considered the important criteria for SPD coordination such as the length of cable to the equipment. This study was conducted by software simulation and real equipment experiment. Simulation was use circuit modelling software known as PSCAD. It used to analyze the characteristics of SPD and investigate the oscillation phenomenon. In order to prove it is a reliable simulation it requires validation using experiment. Therefore, experiments using actual equipment was be carried out at the High Voltage Laboratory, University of Technical Malaysia Melaka (UTeM). Results of the data from the two experiments are compared and analysed. The analysis shows that the effect of the increment of impedance grounding was affected the discharge surge current from SPD to earth.

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