Abstract: In this paper, a "dual-reference" detection technology based on DC potential gradient measurement was proposed to address the challenge of detecting ferrosilicon anode broken cable faults in complex station environments. The failure mechanisms of traditional detection methods in station environments were systematically analyzed, leading to the establishment of a current field distribution model for the ferrosilicon anode ground bed and the development of a DC voltage difference measurement method using dual-reference electrodes. Field tests demonstrated that a 100% detection rate for broken cable faults and a positioning accuracy of ±1.5 m could be achieved, even in strong interference environments with high grounding resistance and stray current density. Compared to traditional alternating current voltage gradient and 1/2 methods, the proposed method enhances detection efficiency, reduces equipment costs, and lowers the cost of individual troubleshooting. Research has confirmed that the dual-reference method effectively mitigates electromagnetic interference and signal crosstalk issues in the station by measuring the DC potential gradient of the anode ground bed (fault characteristic value: 0 V), offering an innovative solution for diagnosing ferrosilicon anode broken cable faults for cathodic protection in complex environments.