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T. Tran-quoc, S. Lam-du, D. Pham-van, N. Nguyen-khac, and L. Tran-dinh, Temporary Overvoltages in the Vietnam 500 kV Transmission Line, IEEE Conference on Transmission & Distribution C ons t ruction, Op e ration and Liv e -Line M aint enanc e, I E E ElES M O 98, 1998.

T. Tran-quoc, T. Vu-duc, R. Feuillet, N. Hadjsaid, J. C. Sabonnadière et al., D5rnamic Analysis of Voltage Stability of the Vietnam System, Energy Management and Power Delivery Conference, 0998.

T. Tuan, 93) was born in 1960 in Vietnarn He received the Engineer degree in Electrical Engineering from the Ho Chi Minh City University of Technology (Vietnam) in 1982. From 1983 to 1988 he worked as an assistant professor at the same University. He obtained the "Diplôme d'Etudes Approfondies" and the From, Diplôme de Docteur" (Ph.D.) from the Institut National Polytechnique de Grenoble (INPG.), France, 1989.

E. Electricité-de-france, He is presently with l:boratoire d'Electrotechnique de Grenoble. His research interests lie in the fields of power system analysis, operations and stability and electromagnetic transients, 1996.

H. Nouredine and . Born, He received the Engineer degree in Electrical Engineering from the Tizi Ouzou University (Algeria) in 1987, the "Diplôme d'Etudes Approfondies" and the "Doctorat de I'INPG" degree from the Institut National Polytechnique de Grenoble (I.N.P.G.), in 1988 and 1992, respectively. Since 1993 he served as an associate professor at the Ecole National, Algeria

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T. Tuan, He received his degree in Elecrical Engineering from the Ho Chi Minh City University of Technology (Vietnam) in 1982. From 1983 to 1988 he worked as a lecturer at the same University. He obtained the "Diplôme d'Etudes Approfondies" and the "Diplôme de Docteud' (Ph.D.) from the Institut National Polytechnique de Grenoble (INPG.), France, in 1989 and 1993, respectively. From 1993 to 1994 he worked as a postdoctoral fellow in the Grenoble National Electrical Engineering School (ENSIEG -INPG). From, He works currently with the Institut National Polytechnique de Grenoble. His research interests lie in the fields of power system operaeions and electromagnetic transients, 1960.

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T. Tran-quoc, L. Pierrat, A. Montméat, and J. L. Kueny, Modeling Nonlinear Elements in a Digital Simulator, Part I: lmplementation, IEEAICDS 97, 1997.

T. Tran-quoc and L. Pierrat, Correction of the Measured Core Losses under Distorted Flux, IEEE Trans. on Magnetics, vol.33, issue.2, pp.20-25, 1997.

T. Tuan, 93) was born in 1960 in Vietnam He received his degree in Electrical Engineering from the Ho Chi Minh City University of Technology (Vietnam) in 1982. From 1983 to 1988 he worked as an assistant professor at the same University. He obtained the "Diplôme d'Etudes Approfondies" and the From, Diplôme de Docteut'' (Ph.D.) from the Institut National Polytechnique de Grenoble, 1989.

E. Electricité-de-france, He is presently with laboratoire d'Electrotechnique de Grenoble. His research interests lie in the fields of power system analysis, operations and stability and electromagnetic transients, 1996.

L. Son, . Du, and . Born, He received his degree in Elecuical Engineering and M.Sc degree from the Ho Chi Minh City University of Technology (Vietnam) in 1978, 1992, respectively. From 1978 to 1986 he worked as an assistant professor at the same University, 1954.

P. Doan, . Van-was-born-in, and . Vietnam, He was graduated from ESME

. Paris, He joined Delle Alsthom in 1958 as a research engineer and worked on the development and testing of EHV circuit breakers, Mr, 1978.

N. Nhan, . Khac-was-born-in, and . Vietnam, He received his degree in Electrical Engineering and the "Diplôme de Docteut, Ph.D.) from the Institut National Polytechnique de Grenoble (I.N.P.G.), France. From, 1972.

T. Long, . Dinh-was-born-in, and . Vietnam, He received his degree in Electrical Engineering from the Hanoi Polytechnical Institute (Vietnam) and PhD and D. Sc from Moscow Energy Institute (Russia) Since 1959 he has VII. REFERENCES tll tWorking Group 38.02, Task Force I l, "lndices Predicting Voltage Collapse Including Dynamic Phenomena, CIGRE, 1994.

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T. Tuan and . Was-born, (Vietnam) in 1982. From 1983 to 1988 he worked as an assisûant professor at the same University He obtained his "Diplôme d'Etudes Approfondies" and "Diplôme de Docteur France, in 1989 and 1993, respectively. From 1993 to 1995 he worked as a postdoctoral fellow in the l:boratoire d'Electrotechnique de Grenoble, Ph.D.) from the Institut National Polytechnique de Grenoble (INPG) he was a research engineer at the French Electricity Board, 1960.

. Grenoble, His research interests are in the fields of power system analysis, operations and electromagnetic transients

(. I. Grenoble, France in 1996 and 1997, respectively. He is cunently pursuing a PhD

J. Claude and S. Eng, DSc 69 is presently professor at the Institut National Polytechnique de Grenoble (INPG), France. The research of professor Sabonnadière is focused on modelling and calculation of electromagnetic fields and devices. He has published more than 150

L. Ut, . Vai{, and . Born, He received his degree in Electrical Engineering from the Hanoi University of Technology (Vietnam) in 1968, and his PhD degree from the Moscow Power Engineering Institute (Russia) in 1983. Since lfti8 he has been professor at the Hanoi University of Technology (Vietnam) He is presently, 1946.

N. Cuong, . Duc, and . Born, He received his degreè in Power System Engineering from the Hanoi University of Technology (Vietnam) in 1992. Since 1993 he has been Senior Engineer at the National Lnad Dispatch Center -Electricity of Vietnam. He is presently Deputy Head of Planning department, National [.oad Dispatch Center, 1972.