How do you coordinate a relay?

The relay co-ordination is nothing but a tripping of protecting relay in a sequence or order in electrical power system. Relay coordination is very difficult task for relay engineers. Relay co-ordination is required to isolate the faulty part with minimized relay & circuit breaker operation.

What is protection coordination?

An electrical power system is designed so that if a short-circuit occurs, a protective device (such as a fuse or circuit breaker) will operate to “open the circuit” and prevent the continued flow of electrical energy to the faulted area.

What is protection relay configuration?

Each protection unit comprises a definite-time delay overcurrent relay in which the operation of the current sensitive element simply initiates the time delay element. Provided the setting of the current element is below the fault current value, this element plays no part in the achievement of discrimination.

What is protection relay function?

The purpose of the protection relay is to detect a problem, ideally during its initial stage, and to either eliminate or significantly reduce damage to personnel and/or equipment.

What does relay coordination require?

Relay coordination is an important aspect in the protection system design as coordination schemes must guarantee fast, selective, and reliable relay operation to isolate the power system faulted sections. Thus the relay coordination problem is formulated, for a real time distribution system is simulated using ETAP.

What is relay operation?

How Relays Work. Relays are switches that open and close circuits electromechanically or electronically. Relays control one electrical circuit by opening and closing contacts in another circuit. As relay diagrams show, when a relay contact is normally open (NO), there is an open contact when the relay is not energized.

What is fault coordination?

Benjamin O. Medich. Selective coordination generally describes the design of an electrical system in which the upstream protective device (fuse or circuit breaker) nearest to the system fault clears the fault without affecting the protective devices that are upstream from it.

What is the purpose of a coordination study?

The purpose of a coordination study is to determine the proper settings for overcurrent protective devices in the power system.

What is main function of relay?

Relays are the switches which aim at closing and opening the circuits electronically as well as electromechanically. It controls the opening and closing of the circuit contacts of an electronic circuit. When the relay contact is open (NO), the relay isn’t energize with the open contact.

What is meant by relay setting?

Relay settings means actual value of the energizing or characteristic quantity at which the relay is designed to operate under given conditions.

What are the fundamentals of protection relay co-ordination?

The starting current requirements of motors and the starting and locked rotor/stalling times of induction motors. The transformer inrush, thermal withstand and damage characteristics. Decrement curves showing the rate of decay of the fault current supplied by the generators. Performance curves of the current transformers.

What are the benefits of a protective relay?

The selection and applications of protective relays and their associated schemes shall achieve reliability, security, speed and properly coordinated. Meanwhile, protective devices have also gone through significant advancements from the electromechanical devices to the multifunctional, numerical devices of present day.

Why is relay coordination study and analysis performed?

Relay coordination is an important aspect in the protection system design as coordination schemes must guarantee fast, selective, and reliable relay operation to isolate the power system faulted sections. Why is Relay Coordination Study and Analysis Performed?

Why are relays important in a power system?

In power system protection relay and circuit breakers is the major instrument for large interconnected power system. We need proper protection to isolate the faulted region from healthier network.

How do you coordinate a relay? The relay co-ordination is nothing but a tripping of protecting relay in a sequence or order in electrical power system. Relay coordination is very difficult task for relay engineers. Relay co-ordination is required to isolate the faulty part with minimized relay & circuit breaker operation. What is protection coordination?…