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System Study



Discrimination is a very important aspect of an electrical system design that is often overlooked. Discrimination is critical in ensuring that only the protection equipment immediately upstream of a fault will trip so that the balance of the electricity supply still works. Electrical discrimination occurs when a smaller circuit breaker/fuse, placed closer to an electrical fault, functions before a bigger circuit breaker, which is located further away from the fault. By knocking out the fuse, this stops the disruption to other circuits, which not only knocks out the fault, but also all the other circuits with no faults on them.


If the discrimination system studies are not conducted, or are incorrectly carried out, an electrical fault may cause many protective devices to trip, thereby triggering an interruption in the supply of electrical power to a large part of the network. This creates an abnormal loss in the availability of electrical power for those parts of the network where no fault occurred. The most appropriate time to conduct a discrimination system study is before ordering the switchboard and the panel board circuit breakers.


Elensol conducts electrical discrimination system study by calculating and optimising selectivity and testing of low-, medium- and high-voltage networks, thereby eliminating any fault in the electrical installation in the shortest amount of time. In our audit, we examine all the electrical installation documentation and collect all the necessary data. Based on this information, we develop a model of the unit’s electrical networks, which are run through the appropriate software. Our state-of-the-art software packages calculate short circuit currents, selectivity diagrams and voltage drops, revealing any weak points in the electrical networks. The conclusions from this data and the proposed necessary changes are discussed by our experts with the customer’s staff.