Abstract: Insulation faults in power transformers are directly associated with partial discharge (PD). Accurate PD localization is key to ensuring equipment safety. To solve the poor anti-interference and low accuracy of existing single-sensor PD localization, a multi-parameter sensor collaborative scheme is proposed. By deploying high-frequency current sensors, UHF sensors, ultrasonic detectors and impedance sensors, an electrical-acoustic-electromagnetic multi-dimensional sensing system is built. Tests verify this technology breaks the bottlenecks of single-sensor localization, supporting reliable transformer insulation fault diagnosis.