What was the primary design goal of air blast breakers?

The primary design goal of air blast breakers was indeed to break current while making oil breakers obsolete. Air blast circuit breakers utilize compressed air to extinguish the arc that forms when electrical contacts are opened. This technology was developed as a response to the limitations of oil circuit breakers, which relied on oil as an insulating and arc-extinguishing medium.

Air blast breakers offered several advantages, such as faster operation and reduced maintenance due to the absence of oil, which could degrade over time and required more extensive handling and disposal measures. By using air as the primary medium, these breakers provided a more reliable and efficient method for interrupting high currents without the disadvantages associated with oil technology, thus contributing to their growing acceptance in electrical systems.

The other mentioned options do not align with the primary goals of air blast breakers. Reducing system voltage and enhancing battery conductivity do not relate to the core function of a circuit breaker, while improving the efficiency of transformers pertains to different aspects of electrical engineering and does not involve the function of breaking or interrupting current.