Modelling non-standard over current relay characteristic curves using combined lagrange polynomial interpolation and curve fitting


The characteristic curve of over current relay (OCR) has a very important role in the electrical protection devices. Standard characteristic curve such as Normal Inverse (NI), Extremely Inverse (EI), Very Inverse (VI) and Longtime Inverse (LTI) are often changed at the time of implementation, carried out for the purposes of security protection system due to… (More)


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