Abstract
This paper presents the modelling and analysis of unit protection of feeders. The protection system module is linked to the primary power system module in such a way that it acts as a feedback loop. The primary power system module provides the three-phase voltages and/or currents at the transducer locations. The protection system module then processes this data, and outputs a circuit breaker status, which can then be feedback to the primary power system module. The paper also describes the operating principles of the protection unit. Finally, practical applications of the model under fault conditions are examined.
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