During a primary injection test, what is measured?

During a primary injection test, the main focus is on measuring the current flowing through a circuit under conditions where high voltage is applied, specifically to assess the functionality and performance of circuit breakers. This process involves passing high current directly through the circuit breaker to verify its operation and ensure it can interrupt the circuit as intended under fault conditions. The test evaluates both the response time and the trip settings of the breaker, confirming that it operates correctly when exposed to extreme conditions.

In this context, measuring current provides critical insights into the circuit breaker's performance and reliability, which is paramount for system safety and performance. This method helps to assess whether the circuit breaker can adequately protect the electrical system during overloads or short circuits.

Other options, while they may involve testing different electrical parameters, do not reflect the specific objectives of a primary injection test. Measuring voltage drop, resistance, or power consumption are useful methodologies in other testing scenarios but do not capture the essence of what is being evaluated in a primary injection test focused on circuit breaker functionality.