A Comparative Study of the Voltage Sag Propagation on Distribution Trans- former under Unsymmetrical Faults | [Quaid-e-Awam University Research Journal of Engineering, Science and Technology • 2021]

Author(s):

1. Abdul Khalique Junejo: Department of Electrical Engineering,QUEST, Nawabshah,Pakistan

2. Muhammad Usman Keerio: Department of Electrical Engineering,QUEST, Nawabshah,Pakistan

3. Mohsin Ali Koondhar: Department of Electrical Engineering,QUEST, Nawabshah,Pakistan

4. Munawar Ayaz Memon: Department of Electrical Engineering,QUEST, Nawabshah,Pakistan

5. Muhammad Ismail Jamali: Department of Electrical Engineering,QUEST, Nawabshah,Pakistan

6. Kelash Kanwar: Department of Electronic Engineering,QUEST, Nawabshah,Pakistan

Abstract:

In this paper, the characterization of the voltage sag propagation under unsymmetrical faults through distribution transformer for low voltage power network is tested with the help of a power analyzer, which is based on sequence components. The voltage sag is a big issue of the power quality (PQ) for the power system networks, which must be analyzed and characterized for the suitable protection schemes and the control strategy, separately. In this study, the voltage sag characterization is fully examined under the unsymmetrical faults through the delta-star with ground (D-Yg) connection, which is commonly imlemented in the distribution power transformers. The MATLAB/Simulink and power analyzer tools are used to characterize the voltage sag propagation. The power analyzer works on the symmetrical sequence component's method of the voltage. Moreover, the phasor diagram of the voltage sag is also given in this paper for better understanding. The obtained results would help in the design of the protection schemes for low-voltage and controlling the impact of voltage sag through filters.

Page(s): 90-94

DOI: 10.52584/QRJ.1901.13

Published: Journal: Quaid-e-Awam University Research Journal of Engineering, Science and Technology, Volume: 19, Issue: 1, Year: 2021

Keywords:

power quality , power analyzer , sequence component , and voltage , distribution transformer

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