Zobrazeno 1 - 10
of 55
pro vyhledávání: '"S.E. Zocholl"'
Autor:
S.E. Zocholl, J.B. Mooney
Publikováno v:
IEEE Industry Applications Magazine. 11:77-82
This article is one of the few references describing high current testing of protective relays using low ratio current transformers (CTs). Maximum fault currents on power plant auxiliary buses are routinely 40 kA and can be as high as 80 kA. Accurate
Autor:
P.R. Leblanc, J.E. McConnell, G. Benmouyal, J. Burnworth, R. Ramaswami, P.J. Lerley, J.E. Waldron, J. Pinto de Sa, J. Mizener, S.E. Zocholl, S. Watansiriroch, M. Meisinger, K. Freirich, P.A. Kotos, M.S. Sachdev, W.M. Strang, W.A. Elmore
Publikováno v:
IEEE Transactions on Power Delivery. 14:868-872
This paper introduces the new standard "IEEE standard inverse-time characteristic equations for overcurrent relays". It provides an analytic representation of typical electromechanical relays operating characteristic curve shapes in order to facilita
Autor:
I.O. Hasenwinkle, J.E. Stephens, G.C. Parr, K.A. Stephen, J.W. Chadwick, B.D. Nelson, E.T. Sage, P.R. Drum, L.L. Dovrak, S.E. Zocholl, D.W. Smaha, M.J. McDonald, R. Ryan, G.R. Moskos, J.R. Linders, M.W. Conroy, W.C. Kotheimer, B. Bozoki, J.T. Uchiyama, J.D. Huddleston
Publikováno v:
IEEE Transactions on Power Delivery. 14:94-97
Relay engineers have had to rely on many sources to compile information on current transformer application. Typically, they have drawn on relay application and transformer textbooks, manufacturer publications, and standards. Recognizing the need for
Autor:
S.S. Venkata, W.W. Li, J.R. Linders, A.P. Apostolov, M. Bajpai, P.B. Winston, K. Zimmerman, M.T. Glinkowski, J.R. Boyle, R. E. Wilson, Stanley H. Horowitz, Mladen Kezunovic, L. Budler, Tarlochan S. Sidhu, G.L. Michel, B. Chattopadhyay, S.E. Zocholl, James S. Thorp, M.M. Begovich
Publikováno v:
IEEE Power Engineering Review. 17:15-19
Autor:
E.O. Schweitzer, S.E. Zocholl
Publikováno v:
IEEE Industry Applications Magazine. 2:28-34
A comprehensive list of nondirectional overcurrent relays would include thermal overload, inverse-time, definite time, and instantaneous relays. The list could be further classified by operating quantities including individual phase, residual, and ne
Autor:
D.W. Smaha, P.A. Kotos, C.W. Barnett, J.W. Chadwick, W.C. Kotheimer, J.R. Linders, S.E. Zocholl, K.J. Khunkhun, J.W. Walton, P.B. Winston, P.R. Drum
Publikováno v:
IEEE Transactions on Industry Applications. 31:392-404
Low-ratio toroidal current transformers (CTs) are in existence in many locations on power systems. The majority of these CTs are in the auxiliary switchgear at generating stations, but are not limited to this application. The ratio of the CTs used in
Publikováno v:
IEEE Transactions on Industry Applications. 29:404-411
The authors attempt to show, theoretically and by laboratory tests, the influence of harmonics on protective relays. Representative relays using various operating principles were tested using fundamental currents and/or voltages. They were then teste
Autor:
S.E. Zocholl
Publikováno v:
IEEE Computer Applications in Power. 4:22-26
A motor analysis program called MotorLab, which allows a protection engineer to complete a motor analysis in a matter of minutes, is described. MotorLab uses the minimum essential motor rating, torque, and thermal data to produce plots of the startin
Autor:
S.E. Zocholl
Publikováno v:
IEEE Transactions on Power Delivery. 5:1275-1280
A motor starting study can be completed in a matter of minutes using a PC program written for the purpose. The study uses readily available nameplate, load, and thermal-limit data and determines the most significant motor protection criterion: rotor
Publikováno v:
2007 IEEE Petroleum and Chemical Industry Technical Conference.
Part I expressed concerns about using IEEE Standard C37.110-1996 (1+X/R) criteria for sizing current transformers (CT's) for feeder short-circuit conditions [1]. Part II introduces an overview of relay filter algorithms, and proposes responsibilities