Method and system for acquiring safe distance when water gun is used for fighting photovoltaic fire

The invention discloses a method and system for obtaining a safe distance when a photovoltaic fire is put out through a water gun, and belongs to the technical field of new energy, and the method comprises the steps: S1, obtaining the volume flow Q of the water gun in real time, and reasoning the unit distance resistance value RL of a water column sprayed by the water gun; s2, the direct-current voltage UP, the human body resistance RS and the safety voltage US at the photovoltaic fire site are obtained in real time, and the minimum length LS of a water column sprayed by a water gun under the safety voltage condition is obtained through reasoning; s3, according to the minimum length LS of a water column sprayed by the water gun under the safe voltage condition, the minimum safe distance L of live-line fighting is inferred; and S4, the safety distance L'is not smaller than the minimum safety distance L. According to the method, the live-line fighting safety distance is calculated and determined according to mu