Arc light protection method for electrical equipment

The invention relates to an arc light protection method for electrical equipment. The arc light protection method for the electrical equipment includes that carrying out AND logic judgment on sound wave signals and light wave signals under the running state of the electric equipment, and outputting to a breaker through a fast relay. The judgment method does not use current signals as a main criterion so as to perform a protection operation on an accident or a hidden danger in the equipment which does not cause current change. The arc light protection method can refer to current signals and use the current signals and the AND logic result to perform OR operation judgment to output a final result. The arc light protection method capable of monitoring and processing effectively when an arc light fault has just happened effectively protects the nearby workers from body hurt due to the arc light, protects medium-low voltage equipment from serious damage, prevents a fire hazard, greatly reduces the power failure time for the user and prolongs the service life of the existing switch related equipment.