Open Access Open Access  Restricted Access Subscription Access

A Fast Approach for Short Circuit Analysis on 330kV Nigeria Power System

Candidus. U. Eya, I O Ozioko, G N Ajah


Fault in electrical power system is unavoidable. The occurrence of faults in power system network destabilizes the system. Thus, it requires a fast technique to stabilize the system to avoid total system collapse. In this work, an application program was developed using MATLAB tool based on bus impedance matrix method. Bus impedance matrix is used because it has several advantages over Thevenin equivalent method and other conventional approaches since it can be used to analyze large network and solve for branch currents. This approach contains off-diagonal elements of the system which Thevenin and other conventional approaches do not have. The work investigated line-to-line fault on a 4-bus/330kV Nigeria power system, under unbolted fault condition. The total fault current was found to be 10p.u while the voltages for buses 1, 2, 3 and 4 were obtained as 1p.u at phase a which shows that phase a was not affected during the fault. Phase b and phase c show equal voltages for the respective buses during the fault. Bus-3 shows a lesser voltage of 0. 97p.u due to fault occurring at bus 3. The approach can identify the rating of the protective device for effective protection of the system over short circuit occurrence at a short period of about 1sec.

Full Text:



H.Saadat “Power System Analysis”, McGraw-Hill Companies, Inc. USA, 1999.

A. O. Ekwue “Worked examples in Power System Engineering”, University of Nigeria Press Ltd, 2015.

S. Mahapatra and M. Singh “Symmetrical Fault Analysis”, International Journal of Future Generation Communication and Networking, Vol. 9, No. 4, pp 51-62, 2016.

G. A. Adepoju, O. A. Komolafe, M. A Tijani and A. O. Bisiriyu, “Fault Analysis for Circuit Breakers Ratings Determination on Nigerian 330kV Transmission Grid”, the International Journal of Engineering and Science (IJES), Vol. 2, No. 3, pp 116-123, 2013.

G. Andersson “power system analysis”, Swiss Federal Institute of Technology, Zuric, Eidgenossische Technische Hochschule Zuric, Sept. 2012.

P. V. Dhole and F.S. Khan “Transmission Line Fault Analysis Using Bus Impedance Matrix Method”, International Journal of Engineering Research and Technology (IJERT). Vol. 4, No. 3, pp. 948-954, 2015.

S. Srivastava, Km. Reshu, and S. Singh “Mathematical Calculation and MATLAB Programming of Symmetrical and Asymmetrical Faults in Power System”, Vol. 4, No. 2, pp. 184-187, 2014.

D. Tziouvaras “Analysis of Complex Power System Faults and Operating Conditions”, Schweitzer Engineering Laboratories, Inc. 2008/2009.

S. Srivastava, Km. Reshu, and S. Singh “Mathematical Calculation and MATLAB Programming of Symmetrical and Asymmetrical Faults in Power System”, Vol. 4, No. 2, pp 184-187, April 2014.

G. A. Ajenikoko and S. O. Sangotola, “Power System Fault: A Hindrance to Sustainability and Reliability”, International Journal of Engineering Research, Vol. 3, No. 11, pp 700-703, 01 Nov. 2014.

O. S. Onohaebi, “Power Outages in Nigeria Transmission Grid”, Journal of Applied Science, Vol. 4, No. 1, pp 1-9, 2009.

D. C. Yu, D. Chen, S. Ramasany and D. G. Flin “A Windows Based Graphical Package for Symmetrical Component Analysis”, IEEE Trans. on Power System. Vol. 10, No. 4, PP 1742-1749.

J. B. Gupta “A Course in Electrical Power”, S. K. Kataria and Sons, January 1, 2005.

National Control Centre, Osogbo (TCN) Grid 330kV Logbook for Daily Load Flow.


  • There are currently no refbacks.