Open Access Open Access  Restricted Access Subscription or Fee Access

The Application of a 6% Reactor in High-Voltage Capacitor Bank Switching

Pathomthat Chiradeja(1), Atthapol Ngaopitakkul(2*)

(1) Faculty of Engineering, Srinakharinwirot University, Thailand
(2) Faculty of Engineering, King Mongkut’s Institute of Technology Ladkrabang, Thailand
(*) Corresponding author



The switching of capacitor banks at high voltage for power-factor improvement and voltage support can generate significant transients. Such switching transients are produced by inrush currents and transient overvoltages in systems to which the capacitor bank is connected. These switching transients can cause damage to insulation and mal-operation of protective relays. This paper presents the simulation and investigation of a switching large-shunt capacitor bank in a 230kV Thailand substation system. A computer simulation using PSCAD/EMTDC was performed to determine the peak of the transient currents, the oscillation overvoltage and the frequency of the inrush current. The transient inrush current is generated by energizing of the 4×72 MVAr, 230 kV shunt capacitor banks. Methods of inrush current transient analysis and reduction were evaluated. Limiting the transients with a 6% reactor in series was simulated. The simulations indicate that the 6% reactor can significantly reduce the magnitude of the transients.
Copyright © 2016 Praise Worthy Prize - All rights reserved.


Shunt Capacitor Bank; 6% Reactor; Inrush Current; Switching Transients; Current Limiting Reactor; Back-to-Back Capacitor Switching

Full Text:



Muthukumar, K., Jayalalitha, S., Ramaswamy, M., PSO Embedded Artificial Bee Colony Algorithm for Optimal Shunt Capacitor Allocation and Sizing in Radial Distribution Networks with Voltage Dependent Load Models, (2015) International Review of Electrical Engineering (IREE), 10 (2), pp. 305-320.

Ouchatti, A., Abbou, A., Akherraz, M., Taouni, A., Three-Phase Shunt Active Filter with Compensation of Reactive Power, (2014) International Review on Modelling and Simulations (IREMOS), 7 (1), pp. 22-29.

Jayachandran, J., Murali Sachithanandam, R., Artificial Intelligence Based Controller for Series and Shunt Active Filters for Power Quality Improvement, (2015) International Review of Automatic Control (IREACO), 8 (3), pp. 180-190.

Chattopadhyay, T., Banerjee, S., Chanda, C., A Simple Approach on Voltage Stability Index of Distribution Systems for Loads of Different Types, (2014) International Review of Electrical Engineering (IREE), 9 (5), pp. 1002-1011.

IEEE Guide for Application of Shunt Power Capacitors, IEEE Standard 1036-2010, September 2010.

Thomas M. Blooming, and Daniel J. Carnovale, Capacitor Application Issues, IEEE Transactions on Industry Applications, vol. 44(Issue 4), pp. 1013-1026, 2008.

Ahmed Hassan Aly Amer, Transient over Voltages in Electric Distribution Networks Due to Switching of Capacitor Banks Steps, International Conference on Electrical, Electronic and Computer Engineering (ICEEC2004), pp. 872-875, 2004.

B. Bhargava, A.H. Khan, Ali F. Imece, and J. DiPietro, Effectiveness of pre-insertion inductors for mitigating remote overvoltages due to shunt capacitor energization, IEEE Transactions on Power Delivery, vol. 8:1226 – 1238, 1993.

Paul Stroica, Modern Methods for Synchronous switching of the Romanian Power System Circuit Breakers in 400kV Substation, 10th Mediterranean Electrotechnical Conference, MEleCon, vol. 3, pp. 949-953, 2000.

J. C. Das, Analysis and Control of Large-Shunt-Capacitor-Bank Switching Transients, IEEE Transactions on Industry Applications, vol. 41(Issue 6), pp. 1444-1451, 2005.

Meisam Sadeghi, Ebrahim Babaei, Mehrdad Rabetian, and Habiballah Nahalparvari, Mitigation of capacitor banks switching transients considering injected harmonics, Iranian Conference on Electrical Engineering (ICEE), pp. 1-5, 2011.

L. Cipeigan, M. Chindris, J. Rull, A. Rusu, A. Sumper, R. Ramirez, and R. Alves, Mitigation of Capacitor Bank Energization Harmonic Transients, IEEE/PES Transmission & Distribution Conference and Exposition : Latin America, pp. 1-5, 2006.

Shunt Capacitors for A.C. Power Systems Having a Rated Voltage above 1000V – Part 1: General, IEC Standard 60871-1, July 2005.

IEEE Application Guide for Capacitance Current Switching for AC High-Voltage Circuit Breaker, IEEE Standard C37.012-2005, December 2005.

IEEE Guide for the Protection of Shunt Capacitor Banks, IEEE Standard C37.99-2000 (R2006), September 2006.

Transmission System Operation Planning Department. Switching and Transmission Line Diagram. Bangkok, Thailand: Electricity Generation Authorisation Thailand Press, 2010.

Michael Beanland, Thomas Speas, and Joe Rostron, Pre-insertion Resistors in High Voltage Capacitor Bank Switching, Western Protective Relay Conference, pp. 1-12, 2004.

M. F. Iizarry-Silvestrini, and T.E. Vélez-Sepúlveda, Mitigation of Back-to-Back Capacitor Switching Transients on Distribution Circuits, Department of Electrical and Computer Engineering, University of Puerto Rico, 2006.

Industrial A.C. Networks Affected By Harmonics – Application of Filters and Shunt Capacitors, IEC Standard 61642, September 1997.

EMTDC: Transient Analysis for PSCAD Power System Simulation, Manitoba HVDC Research Centre, Manitoba HVDC Research Centre Inc., Manitoba, Canada 2003.

A. Greenwood, Electrical Transients in Power Systems, (Joh Wiley & Sons, 2nd ed., 1991).


  • There are currently no refbacks.

Please send any question about this web site to
Copyright © 2005-2020 Praise Worthy Prize