What is protection relay coordination?

Coordination is a systematic application of current actuated devices in a power system, which in response to a fault or overload will remove only a minimum amount of equipment from service. The objective is to minimize the equipment damage.

What is protection coordination?

What is protective coordination? It’s the selection, arrangement, installation, and maintenance of protective devices to limit the effects of an overcurrent (short-circuit) situation to the smallest area. Protective coordination requires modeling the entire electrical network.

Why do we need relay coordination?

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.

Why is protection coordination important?

This time-sequence of operation is called “coordination of protective devices.” A protection-coordination study is done to determine the trip settings of each protective device in the power system so that maximum protection with minimum interruption is provided for all faults that may happen in the system.

What are the types of protection?

Types of protection

  • High-voltage transmission network. …
  • Generator sets. …
  • Overload and back-up for distance (overcurrent) …
  • Earth fault/ground fault. …
  • Distance (impedance relay) …
  • Back-up. …
  • Low-voltage networks. …
  • Cybersecurity.

What is the purpose of a protection relay?

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.

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