LAVT

An LAVT panel is a cubicle which houses a Lightning Arrester (Surge Arrester), Surge Capacitor, and Voltage / Potential Transformers for a Phase Isolated Bus Duct.

Lightning arrestor is there to provide protection against any surges in voltage, hence the name lightning arrestor, it is a device that safely diverts any surge in voltage "away" from your plant therefore protecting your equipment against overvoltage conditions.

A capacitor is connected in parallel with the lightning arrester for enhanced protection as well.