The invention discloses a data processing method and equipment for a power grid. The method comprises the steps: obtaining an influencing parameter of delay time of an insulator, to which flashover happens, wherein the delay time is a time interval from the moment of flashover of the insulator to the moment of the tripping of a corresponding circuit breaker in a transformer substation; determining delay time according to the obtained influencing parameter of delay time and a delay time assessment model; and determining the tripping record, caused by the flashover of the insulator, in power grid data record according to the delay time. The method and equipment can effectively determine the tripping record, caused by the flashover of the insulator, in power grid data record.