Cable line cross interconnection grounding loop resistance live detection device and method

The invention discloses a cable line cross interconnection grounding loop resistance live detection device and method, and the device consists of an excitation module, a current collection module, a voltage collection module, a central processing unit, a man-machine interface and a communication interface. The central processing unit controls the excitation module to generate a current signal with the frequency of f, the excitation current transformer acts on a grounding loop to generate a current signal in a coupling mode in the loop, the current acquisition module acquires current effective values and phases of all branches of current, and the current effective values and the phases are connected into the central processing unit after being filtered by the band-pass filter. The voltage acquisition module acquires voltages at two ends of the reference resistor, the voltages are filtered by the band-pass filter and then accessed to the central processor, the central processor solves loop resistance, and the c