High Voltage Distribution Relays (HVDRs) play a crucial role in the protection, control, and reliability of electrical power distribution systems. These relays are designed to monitor, detect, and respond to fault conditions in high-voltage networks, typically ranging from 6kV to 35kV or higher. By ensuring the swift isolation of faulty sections of a power grid, HVDRs prevent damage to electrical equipment and minimize the risk of widespread power outages. In this article, we will explore the functionality, components, applications, and future trends of High Voltage Distribution Relays in modern electrical systems.    High Voltage Distribution Relay： Key Protection and Control in Electrical Systems