1. Improved security. By detecting ground faults, transformers help improve the security of the grid. It can help prevent current from leaking to the ground, reduce the risk of electric shock, and prevent equipment from overloading, thereby ensuring the reliability of the power grid.

2. Data collection. Transformers can also be used for data collection and monitoring grid performance. It provides real-time information on zero-sequence currents in the power grid, helping to analyze the operation and performance of the power grid and detect potential problems in advance.