Relay Coordination Study Service

In power system networks, protection must be designed so that protective relays isolate the faulted portion of the network, preventing equipment damage and operator injury, and ensuring minimal system disruption, allowing service to the healthy portion of the network to continue.

To achieve proper fault identification and fault clearance sequence, relay coordination is used. These relays must be able to distinguish between normal operating currents and short-term overcurrents caused by normal equipment operation, such as motor starting currents, transformer inrush currents, and sustained overcurrent caused by fault conditions. Power system relaying and overcurrent protection are concepts that are mutually dependent and contribute to the plant’s smooth operation. Protection coordination or protective device coordination research will include the calculation of protection relay settings as well as power system protection and switchgear such as MCB, Fuse, ACB, VCB, and so on.

As protection is a major concern in any industry, and they rely on protective devices for the same, a relay coordination study and analysis is performed to ensure that the system’s safety operations are functioning correctly and to avoid nuisance tripping. The cause of nuisance tripping is the modification of protective devices and their settings during maintenance without appropriate study and analysis.

A coordination study’s goal is to determine the characteristics, ratings, and settings of overcurrent protective devices that will ensure that the minimum unfaulty load is interrupted when protective devices isolate a fault or overload anywhere in the system. A coordination study should be carried out.