Development history of relay protection

Relay protection has developed with the development of the power system. With the development of power systems in the early 20th century, relays began to be widely used in the protection of power systems. This period was the beginning of the development of relay protection technology. The earliest relay protection device was a fuse. From the 1950s to the end of the 1990s, in more than 40 years, relay protection has completed four stages of development, from electromagnetic protection devices to transistor-type relay protection devices to integrated circuit relay protection devices. Then go to the microcomputer relay protection device.

With the rapid development of electronic technology, computer technology and communication technology, artificial intelligence technologies such as artificial neural networks, genetic algorithms, evolutionary scale, and fuzzy logic have been successively applied in the field of relay protection, and relay protection technology has been computerized and networked. Development, integration, and intelligent development.

In the last 25 years of the 19th century, the fuse of the first relay protection device was put into use. With the development of power systems, the power grid structure has become increasingly complex, and the short-circuit capacity has been increasing. By the early 20th century, electromagnetic relay protection devices acting on circuit breakers were produced. Although electronic devices began to be used in protective devices in 1928, the extensive promotion and production of electronic static relays was only realized after the rapid development of transistors and other solid-state components in the 1950s. Static relays have the advantages of high sensitivity and speed, simple maintenance, long life, small size, low power consumption, etc., but are more susceptible to environmental temperature and external interference. In 1965, digital relay protection for computer applications appeared. The rapid development of large-scale integrated circuit technology, the universal application of microprocessors and microcomputers has greatly promoted the development of digital relay protection technology. At present, digital protection of microcomputers is in the process of research and experiment, and a small number of devices have been officially launched. run.

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