Protective relaying is one of the most important and highly technical fields in electrical engineering. It is so critical, since it involves the protection of our power system to abnormal conditions that might be subjected to our power equipments and apparatus. It is practically, system protection.

Our power system, composed of our power equipment, transformers, generators, and transmission lines cost a fortune to construct and maintain. It is not rare to see generating plants, and power substations to cost in millions of dollars. Through an intricate manner, a device is used to act as an eye and brain in the protection system. They are called protective relays.

In basic power system set up, power apparatus, like the generators and power transformers may be subject to abnormal conditions like fault. They might experience over current and over voltages. They are usually accompanied with protective equipment like power circuit breakers. But these breakers merely react to what information they are fed with.

Protective relays acts as the “eye” and brain to the muscle of the circuit breakers. These relays therefore must be set and coordinated with, to ensure smooth, reliable, and correct power system protection.

Below are three of the more popular references in basic protective relaying. This is very useful for upstart relay engineers and students as well who are interested in protective relaying. As a career, relay engineer is a good one, as it is one of the highly technical ones.

other references that may interest you:

Just always remember, Protective Relaying is one of the major keys in  System Protection.

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