Voltage surge

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Voltage surge - a short, irregular, destructive impulse of hundreds to thousands of kV, occurring in the electricity grid in the form of a traveling wave propagating in both directions and resulting from electric discharge into the electric line.

A typical stroke represents a pulse in which the "stroke front" corresponds to a very rapid increase in voltage to the peak, then "ridge" corresponds to a slowly decreasing voltage pulse. The parameters that characterize a stroke are the peak voltage, the duration of the forehead, and the time to the semicircle. Stress is an undesirable phenomenon resulting from high power electrical discharges. Stressors exceed the nominal value of the voltages allowed for most machines connected to the mains and consequently their destruction. Therefore, the impact strength of electrical installations is of great importance in designing and protecting equipment against damage or providing stable operation during a storm.

The impact protection laboratories are working on the projects of the protected installations. According to international agreements, a standardized stroke is the statistically the most commonly occurring impact from atmospheric lightning, whose duration of T1 = 1.2 μs ± 30% and the conventional time to T2 = 50 μs ± 20%.

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