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In a power system, protection relays and circuit breakers are the major instruments for protecting a large, interconnected power system. Proper protection is necessary to isolate faulted regions from healthier networks. When two protective apparatus are installed in series with certain characteristics that provide a specified operating sequence, they are said to be coordinated or selective. Relay coordination is an important aspect of protection system design, as coordination schemes must guarantee fast, selective, and reliable relay operation to isolate faulted sections of the power system.
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A relay coordination study and analysis is performed to ensure that the safety operations of the system are functioning correctly and to avoid nuisance ripping. Protection is a major concern in any industry, and protective devices are relied upon for the same. The reason for nuisance tripping is the modification of protective devices and their settings during upkeep without performing a suitable study and analysis.
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The aim of a coordination study is to determine the characteristics, ratings and settings of overcurrent protective devices that will ensure that minimum unfaulty load is interrupted when protective devices isolate a fault or overload anywhere in the system. A coordination study should be conducted in the early planning stages of a new system to tentatively select protection and utilization equipment, in the case where an existing system is modified and new loads are installed, or when existing equipment is replaced with higher-rated equipment.
Our dedicated electrical professional team will visit your location as per the schedule to collect all the required data using our custom-designed mobile app. To conduct a relay setting calculation, we need all the electrical installation data of the plant and their complete behavior manuals. Power system relaying is configured by the OEMs as a standard international practice, and the manufacturer will have defined parameters with respect to the behavior of the equipment.
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