A 35kV busbar surge arrester is designed to protect electrical equipment connected to a 35kV busbar, such as transformers, switchgear, and cables, from overvoltage events caused by lightning strikes, switching transients, or other sudden voltage surges . When a surge occurs, the arrester provides a low-impedance path to ground, diverting the excess energy away from sensitive equipment and maintaining system reliability .
Modern 35kV surge arresters typically use gapless metal oxide varistor (MOV) technology . Under normal operating voltage, the arrester has very high impedance, allowing current to pass through the busbar without interference. When the voltage exceeds a certain threshold (the breakdown voltage), the MOV becomes highly conductive, redirecting the surge current to ground. After the surge passes, the arrester returns to its high-impedance state, ready for the next event .
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