Cable line cross interconnection loop metal shielding resistor live-line detection system and method

The invention relates to a cable line cross interconnection loop metal shielding resistor live-line detection system and method. The system comprises a voltage excitation assembly (1) used for applying two groups of excitation voltage signals with different frequencies to a to-be-detected branch (0) in a cross interconnection loop; the current measuring assembly (2) is used for measuring a current signal generated in the to-be-measured branch circuit (0) to which the excitation voltage signal is applied currently; and the central processing unit (3) is used for synchronously acquiring the excitation voltage signal and the corresponding current signal waveform, and automatically calculating the resistance value of each branch circuit (0) to be measured in the crossed interconnection loop according to the line equivalent impedance relational expression. Compared with the prior art, reliable and accurate measurement of the crossed interconnection loop metal shielding resistance can be rapidly realized, the metal