Power cable fault on-line monitoring and alarming system and method

The invention relates to a power cable fault on-line monitoring alarm system and method, and the method comprises the steps: obtaining power cable monitoring parameters in real time, and calculating the rate change value of the cable monitoring parameters; determining whether a threshold adjustment condition is met or not according to the rate change value; in response to a judgment result meeting a threshold adjustment condition, determining a threshold adjustment value according to the rate change value; and adjusting a threshold value corresponding to the cable monitoring parameter based on the threshold value adjustment value, and carrying out fault alarm prompt according to the adjusted threshold value. According to the invention, the threshold adjustment value is determined through the rate change value, and the threshold corresponding to the cable monitoring parameter is adjusted based on the threshold adjustment value, so that the threshold adjustment mode of the cable online monitoring system is opti