A measurement system for investigation of the breakdown process of lightning impulses on the rod-rod electrode

In this paper, a measurement system will be presented, that is able to record the electric and optic properties of pre-discharge on both rod electrodes simultaneously. The measurement has been carried out with long air gaps up to 3 m and voltages up to 2.4 MV (positive and negative polarities). The experimental setup is divided into three parts: voltage generation and measurement part, photographical part and pre-discharge current measurement (positive and negative) part. The focus of this paper will be mainly on the challenges, difficulties, solutions and finally the description of the constructed pre-discharge-current-measurement units. Each pre-discharge current measurement part (positive or negative) consists a measuring, a power supply, and a communication unit. The measuring unit…