Transformer Accessories

Transformer accessories enhance the system's functionality, its protection, and its reliability. They are necessary because protecting people and property necessitates precautions all along the line and at every point through which electricity flows.

Detecting abnormal events of the power system is the basic mission of protective relays. Some of the most important abnormal incidents that protective relays detect are overcurrents, overvoltages, and short circuits. As soon as these protective relays sense that one of these incidents has occurred, they take immediate action to reduce the possibility of system damage. For instance, if a protective relay detects an overvoltage incident, it can immediately cause a circuit breaker to open, thus disconnecting the overvolted system component from the rest of the system.

Insulating devices (called bushings) allow electric currents to safely pass through the tank that contains a transformer. Bushings are designed to maintain electric isolation between the inside and outside of a transformer. Since by definition a transformer bushing must withstand voltage and carry electric current, its operational reliability is vital to safe and efficient transformer performance.