IIARD International Institute of Academic Research and Development

International Journal of Engineering and Modern Technology (IJEMT )

E-ISSN 2504-8848
P-ISSN 2695-2149
VOL. 10 NO. 7 2024
DOI: 10.56201/ijemt.v10.no7.2024.pg140.149

---

Power System Protection and Relay Coordination in NTA 33/11KV Injection Substation

Akujuru Believe Hachimenum. N., Amadi, Dan Horsfall

---

Abstract

This study presents the modelling and simulation of coordinating’s of protective relays at the Nigerian Television Authority (NTA) 33/11 KV injection substation. The injection substation is located at Mgbuoba, in Obio/Akpor Local Government Area of Rivers State. This research analyzes the poor order of operation of relays in Nigerian Television Authority NTA 33/11kv Injection substation. The substation consists of four 11kv feeders namely Ohakwe, Location, Mgbouba and Ozuoba feeders. Power Supply to NTA 33/11kv Injection substation is through 33kv distribution line duly linked to Rumousi 132/33kv transmission station. When a fault occurs and the main protection fails, the backup protection must intervene to isolate the fault, the defective part must be quarantined when a short circuit is identified to avoid destruction and ensure the safety of personnel and equipment. Programmed relays observe and control the circuit breakers. The circuit breaker is switched off by the relay in the event of a fault. Relays are designed to distinguish between fault and normal conditions and provide protection. The main research objectives were to model NTA 33/11kv injection substation network using ETAP 19.0.1 to analyze the network, and using Newton Raphsons method of load flow analysis to determine the operating voltages at the various bus levels and impedance based method of short circuit analysis to determine the short circuit impedance and the magnitude of the short circuit using ohm’s law.

keywords:

Relays, Circuit Breakers, Buses, Feeders, Current Transformers.

---

References:

Abdur, R. (2022). Protection schemes for electrical power system.
https://www.allumiax.com/blog/protection-schemes-for-electrical-power-system.
Retrieved on 10th July, 2022.

Abouzar, R. & Mahmoud, A. D. (2014). An overcurrent protection relay based on local
measurements. Retrieved from DOI:10.1109/TIA.2014.2385983, on 8th July, 2022.

Abubakar, M. S. & Akim, A. (2008). Relaying Protection Course. Manual submitted to
Professional Skill Training Centre, Kainji, 249-255.

Afolabi, O. A., Ali, W. H., Cofie, P., Fuller, J., Obiomon, P. & Kolawole, E. S. (2015). Analysis
of the Load Flow Problem in Power System Planning Studies. Energy and Power
Engineering, 7, 509-523.

Aguilera, A. (2016). Fault Detection, classification and faulted phase selection approach. Institute
of Electrical and Electronics Engineers Proceeding on Generator Transmission and
Distribution, 153(4), 65-70.

Ahmed, K., Alaam, M. A., Ahmed M. A. & Abdelaziz, A. Y. (2013). “Protection coordination for
distribution systems in presence of distributed generators”, Electric power Components and
systems, 41(5) 1555-1566.
Akintola, A. A. & Awosope, C. O. A. A. (2017). Critical Review of Distribution Substation System
Reliability Evaluations. International Journal of Advancements in Research & Technology,
6(6), 6 -10

Alam, A. A. (2015). Enhancing the performance of electricity distribution companies in Nigeria
via internal control system. Research Journal of Finance and Accounting, 5(22), 197-214.

Al-Nasseri, H., Redfern, M. A. & Li, F. (2016). A Voltage based Protection for Micro-grids
containing Power Electronic Converters,” IEEE Power Engineering Society General
Meeting, 8(6): 1-7.

Amakiri, O. F., Idoniboyeobu, D. C., Ahiakwo, C. O. & Braide, S. L. (2019). Improvement of
33KV overcurrent protection scheme for effurun transmission substation at PTI Road, Delta
State, Nigeria. American Journal of Engineering Research (AJER), 8(4),16-27.

Antonio T. (2012). The Holomorphic embedding load flow method. IEEE Power and Energy
Society general meeting 2011, 22-26.

Ault, G. W. (2003). Strategies Analysis Framework for Evaluating Distribution Generation and
Utility Strategies. Institute of Electrical and Electronics Engineers Proceeding Generation,
Transmission and Distribution, 150(4), 475 – 481.

Bin, L., Xuan, Y. & Zhiqian, B. (2019). Protection Scheme for closed looped Distribution Network
with distributed Generators. International Journal on Sustainable Power Generation and
supply, 4(2), 1-6.

Bunty, B. B. & Dakshata, U. K. (2017). Primary and backup protection.
https://university.listenlights.com/2017/12/01/primary-backup-protection/.Retrieved on 9th July, 2022.

Ezekiel, N. A. & Engla, A. (2019). Enhancing the voltage stability of the Nigerian 330kv 48 bus
power system network using modal/eigenvalue analysis. Journal of Information
Engineering and Applications. 9(7), 2224-5782.

Fayomi, A. G. (2020) Nigeria Economy and Power Sector Reform, 1st edition,

DOWNLOAD PDF

---

Back