Adaptive vs. conventional reach setting of digital distance relays

Abstract In contrast to the conventional approach of setting the reach of a distance relay based on off-line worst-case studies, the adaptive approach adjusts the reach of the relay on-line on the basis of the current power system state. In this paper, results of a simulation study are presented to quantitatively compare the two approaches, taking into account the effects of transmission line parameter uncertainties, mutual coupling between parallel lines, and variations in the system external to the protected line. It is shown that if the relay is to provide optimal selectivity, irrespective of the power system state and the operation mode of the line, it must be set adaptively.

[1]  P. Moore,et al.  An investigation into the use of adaptive setting techniques for improved distance back-up protection , 1996 .

[2]  S. S. Venkata,et al.  Adaptive transmission protection: concepts and computational issues , 1989 .

[3]  B. Russell.  Application of microcomputers to the protection and control of power system substations , 1975, 1975 IEEE Conference on Decision and Control including the 14th Symposium on Adaptive Processes.

[4]  J. R. Linders,et al.  Adaptive transmission relaying concepts for improved performance , 1988 .

[5]  Tomas E. Dy Liacco,et al.  The Adaptive Reliability Control System , 1967 .

[6]  L. van der Sluis,et al.  Adaptive distance protection of a double-circuit line using artificial neural nets , 1994 .

[7]  Om P. Malik,et al.  A laboratory investigation of a digital protection technique for parallel transmission lines , 1995 .

[8]  Arun G. Phadke,et al.  Adaptive transmission system relaying , 1988 .

[9]  Zhang Zhizhe,et al.  An adaptive approach in digital distance protection , 1991 .

[10]  M. S. Sachdev,et al.  An on-line relay coordination algorithm for adaptive protection using linear programming technique , 1996 .

[11]  A. K. David,et al.  Adaptive relay setting for stand-alone digital distance protection , 1994 .

[12]  W. C. Kotheimer,et al.  Feasibility of adaptive protection and control. Discussion , 1993 .

[13]  Mustahsan Mir,et al.  A mathematical technique for the optimum reach setting of distance relays considering system uncertainties , 1989 .