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Due to the continuous development of science and technology in China, technological innovations have started in various fields. In the background of this era, power companies have begun to build smart grids. As a key link in the construction of power grids, substations will inevitably follow the trend of smart development and become the focus of current power companies. However, relay protection determines whether smart substations can achieve efficient operation. This article analyzes the main points of smart substation relay protection, and draw the improvement strategy of smart substations on relay protection, which includes the protection of the transformer, voltage limit delay, and line protection, thus promoting a healthy development of smart grids in China.

Improvement Strategy to Improve Relay Protection Reliability in Smart Substation