Correction to "A new non-communication based protection scheme for three-terminal transmission lines employing mathematical morphology-based filters" [Jan 13 347-356]

This article [ibid., vol. 28, no. 1, pp. 347-356, Jan. 2013] had an incorrect equation (5). It is presented in the correct form here, using the same equation number as in the paper. All of the results in the paper were obtained by using the correct equation and, therefore, are not affected.