Has the lightning arrester installed in the system been damaged or degraded? Can we still rely on the lightning protection device that has been in use for many years? If the system voltage is 380V, is the selected lightning arrester rated appropriately for this application? The RC data is only marked on the surface of the arrester. What is the actual clamping voltage during a surge event? To check this, we can refer to the test method for the pressure-limiting SPD. By pressing the test button, the screen will display the on-voltage and leakage current values. This helps us assess the performance and reliability of the arrester in real-time. It's important to ensure that the arrester is functioning properly, especially if it's been in service for a long time. Regular testing and monitoring are essential to maintain effective surge protection and prevent potential damage to the electrical system. Understanding the actual on-voltage is crucial for determining whether the arrester is providing adequate protection under real-world conditions.
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