The switchgear fault indicator is an intelligent monitoring device for quickly locating internal faults of the switchgear, playing a crucial role in the troubleshooting of power systems. When faults such as short - circuits and groundings occur inside the switchgear, the traditional troubleshooting method requires section - by - section detection, which is time - consuming and labor - intensive. However, this indicator can significantly shorten the fault - location time. Its core consists of a fault - detection sensor, a signal - processing unit, and an alarm module. The sensor monitors parameters such as current and voltage in the circuit in real - time. Once it captures the fault - characteristic signals, it immediately transmits them to the processing unit. After the processing unit confirms the fault type through algorithm analysis, it drives the alarm module to operate. Usually, it gives a warning in the form of eye - catching red light flashing or indicator light illumination. Some models can also send fault information to the operation and maintenance terminal via wireless signals. This indicator is characterized by rapid response and accurate identification. It can react instantly when a fault occurs and can distinguish different fault types such as short - circuits and groundings. At the same time, it is easy to install, does not require changing the original structure of the switchgear, and has strong adaptability. Its application has significantly improved the efficiency of power - fault repair, reduced power - outage time, and ensured the reliable operation of the power system.