Why is relay protection design necessary
They are intended to quickly identify a fault and isolate it so the balance of the system continue to run under normal conditions. The selection and applications of protective relays and their associated schemes shall achieve reliability, security, speed and properly coordinated. For example, unselective protection operation during a medium voltage network fault will cause an outage for an unnecessarily large number of consumers. A single-phase model of a simple power system is developed using the Power System Blockset. Circuit Breakers (CBs), as well as Voltage and Current Transformers (VTs and CTs), are modeled as ideal elements.
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