Non‐ideal input signals lead to incorrect results of distance‐protection algorithms. A method to combine several parallel algorithms will be presented, showing possibilities to mix different types of principles to achieve an improved behaviour. One example of the so called filter‐combination algorithm will be discussed. Simulations have been carried out on a PC 486, using a digital signal‐processing model. The results proof the robust behaviour of the presented method.
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D. Lönard (1996) studied this question.
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