Correct detection of current and voltage is important to guarantee high-speed railway systems work effectively safety, because the pantograph realizes dynamic adaptive action in different contact force, train speed and environment condition. A hybrid sensor based on Hall effect and Rogowski coil is described in this paper. The low-frequency and the DC currents are measured by the Hall sensor, while the high-frequency and the transient currents are effectively taken by the Rogowski coil. The hybrid system enhances the accuracy, dynamic response, and stability, eliminating the shortages of sensor. Simulation results indicate dynamic current waveforms are better followed, the error is decreased, and the system stability is enhanced. This hybrid modelling technique is essential for the advancement of railway electrification, automation, and real-time monitoring systems, including predictive maintenance and energy management.