Design of a Low-Voltage Concentrated Meter Reading Operation and Maintenance Simulation Training Device Simulating the Operation Environment of Three Transformer Areas

According to national regulations, during the process of looped power transfer in low-voltage distribution areas, the two power sources must not be directly interconnected. Instead, one source must be disconnected before closing the low-voltage tie switch, resulting in short-term power outages. To address this issue, there is an urgent need for a device that can rapidly determine whether the dual power sources meet the conditions for loop closure. This paper presents the design of a low-voltage dual power supply loop detection device. By collecting voltage, frequency, phase, and phase angle data and applying a loop-closing algorithm, the device automatically determines the loop connection conditions, enabling seamless power transfer in low-voltage distribution areas with zero user perception. The device is also portable and supports one-to-many operations, effectively reducing equipment investment costs.