What type of power system protection device senses abnormal current and voltage levels from fault conditions?

The type of power system protection device that is specifically designed to sense abnormal current and voltage levels during fault conditions is a relay. Relays are essential components in protection schemes as they monitor electrical circuits and respond to specific conditions, such as overcurrent, undercurrent, overvoltage, and undervoltage. When a fault occurs, the relay detects these irregularities and activates a predetermined action, such as tripping a circuit breaker, to isolate the faulted section of the system and protect equipment from damage.

Transducers, while they can convert signals from one form to another (such as current or voltage), are not primarily intended for protection purposes. Their main focus is on measurement and data acquisition rather than actively responding to faults. Generators are sources of electrical power and do not play a role in sensing faults. Transformers are used to change voltage levels between circuits but are not involved in the direct detection or response to fault conditions.