Underground Loop Transformer Switching for Fast Fault Isolation

The patent combines multiple functions (fault detection, fault isolation, and power restoration) into a single integrated transformer assembly. The switching devices are mounted directly on the transformer enclosure, and the control unit integrates with the transformer's existing components, eliminating the need for separate external control systems and reducing overall system complexity while enabling automated fault management.

The transformer assembly pre-configures switching devices and control logic before faults occur. The control unit is pre-programmed with the algorithms necessary to identify faults and reconfigure the power distribution network, allowing immediate automated response when faults occur, thereby dramatically reducing power restoration time without requiring complex external intervention.

The transformer assembly serves multiple functions: it transforms voltage, detects faults through integrated switching devices, isolates faults automatically, and restores power distribution. By making the transformer multi-functional, the patent eliminates the need for separate dedicated fault isolation equipment, thereby improving fault isolation speed without proportionally increasing manufacturing complexity.

The control unit within the transformer assembly autonomously performs fault detection, analysis, and isolation without requiring external control systems or manual intervention. The system uses its own integrated sensors and switching devices to self-diagnose and self-correct, enabling rapid fault isolation while keeping the manufacturing process relatively simple by avoiding complex external control infrastructure.

The patent divides the power distribution network into separable sections using independently controllable switching devices mounted on the transformer. Each switching device can be independently operated to isolate specific fault sections while maintaining power to other sections. This segmentation improves fault isolation capability while keeping individual switching devices relatively simple and maintainable.

The control unit acts as an intermediary that coordinates the operation of multiple switching devices. It receives signals from the switching devices, processes fault information, and controls their operation sequences. This intermediary control simplifies the complexity of managing multiple switching devices by providing centralized intelligence, thereby improving fault isolation capability while maintaining ease of maintenance through standardized control interfaces.