1. After the input current and voltage are digitally filtered, the fundamental wave is taken out, and then the resistive current fundamental wave peak value Ir1p=Ix1p.cosφ is calculated by the projection method. Because the fundamental wave value is stable, Ir1p is generally used to measure the performance of the arrester.
2. The total current fundamental wave peak value Ix1p is projected as Ir1p in the voltage fundamental wave U1 (E1) direction, and is projected as Ic1p in the vertical direction. φ is the current and voltage fundamental wave phase angle, which contains the selected compensation angle. Therefore, both φ and Ir1p can be used to intuitively measure MOA performance.
3. Zinc oxide arrester is a lightning arrester with good protection performance. Utilizing the good non-linear volt-ampere characteristics of zinc oxide, the current flowing through the arrester at normal operating voltage is extremely small (microamp or milliampere level); when the overvoltage acts, the resistance drops sharply, discharging the energy of the overvoltage, To achieve the effect of protection. The difference between this kind of arrester and the traditional arrester is that it has no discharge gap and uses the non-linear characteristics of zinc oxide to discharge and break.
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