What is the function of a resistive potential voltage transformer?

The function of a resistive potential voltage transformer primarily involves reducing line voltage to levels that are appropriate for use with measurement and relay equipment. This is crucial in electrical systems, as it allows for accurate monitoring and protection measures without exposing sensitive equipment to high voltage levels.

In practical terms, when high voltage is present, connecting measuring instruments directly would be unsafe and could damage the equipment. Instead, the potential transformer steps down the voltage to a safer, manageable level, enabling the precise operation of devices such as voltage meters and relays that require much lower voltage input.

This transformation is essential for ensuring the reliable functioning of electrical systems, as it maintains safety while providing critical information about system conditions. The other options do not accurately describe the primary role of a resistive potential voltage transformer in the context of electrical systems.