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Protection against voltage surges in LV

A voltage surge is a voltage impulse or wave which is superposed on the rated network voltage. Lightning comes from the discharge of electrical charges accumulated in the cumulo-nimbus clouds which form a capacitor with the ground.

Direct or indirect lightning strokes can damage electrical equipment at a distance of several kilometers. Operating voltage surges, transient and industrial frequency over-voltage can also produce the same consequences.The effects are described in this chapter such as overvoltage protection devices and the way to choose the appropiated one. Implementation rules are given respecting installation standards for primary and secondary protection devices.

EIG-J-protection-voltage-surges_1.pdf

EIG-J-protection-voltage-surges_2.pdf