What is the purpose of a timer in EHV breaker maintenance?

The primary purpose of a timer in the context of EHV (Extra High Voltage) breaker maintenance is to measure the speed of breaker contacts and mechanisms. This is crucial because the performance of circuit breakers is heavily reliant on the speed at which their contacts open and close.

Measuring the timing of these operations can indicate whether the breaker is operating within its specified parameters. If the speed is too slow or inconsistent, it could suggest that maintenance or repairs are needed to ensure the breaker functions correctly during fault conditions. Proper timing helps in assessing the operational health of the breaker, ensuring reliability and safety in high-voltage applications.

The other choices relate to different maintenance functions; measuring voltage levels is important for overall electrical system diagnostics, checking the duration of maintenance procedures tracks time management but does not directly impact the functionality of the breaker, and logging temperature readings is necessary for monitoring conditions that may affect equipment performance, yet none of these directly pertain to the mechanism of operation specific to the breaker timing, which is the focus of the question.