NGEF OLTC SELECTOR SWITCH SPARES
The selector switch is mounted on the bottom plate of diverter switch tank submerged in insulating oil of transformer. The tap selector has two circuits per phase, in which one carries current in each tapping position. The moving contact of the selector enables the non current carrying circuit to be connected to the next upward or downward tap. The moving contacts are operated through geneva gear. The current is switched to the next tap by snap action diverter switch.