A new approach to improving the sensitivity of earthing relay and reducing the over-voltage in 6 kV grid of open-pit mines

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Authors:


Ho Viet Bun, orcid.org/0000-0003-2123-9179, HaNoi University of Mining and Geology, HaNoi, the Socialist Republic of Vietnam, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

Le Xuan Thanh, orcid.org/0000-0001-5052-4484, HaNoi University of Mining and Geology, HaNoi, the Socialist Republic of Vietnam, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.


повний текст / full article



Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu. 2022, (2): 054 - 060

https://doi.org/10.33271/nvngu/2022-2/054



Abstract:



Purpose.
Earthing relays are utilized very commonly in open-pit mines for disconnecting the failure part of 6 kV electric system from earthing incident. Much previous research is mentioned on searching either an optimal method for improving the effect of relays or improvements of reducing the overvoltage caused by grounding separately. The paper presents a new approach to not only improving the relays sensitivity but also to limiting the over-voltage. A new algorithm is also proposed to control automatic connection of an additional resistor in order to achieve both above mentioned purposes of 6 kV earthing relay.


Methodology.
The propose controlling diagram is implemented on PROTEUS to get 3U0 signals. The main components appeared when 6 kV feeders were faulted to earth. Afterward, the detecting signal is utilized as input for simulation diagram in MATLAB to get and analyze the wave forms of responded zero sequence voltage.


Findings.
The paper presents a new algorithm utilizing a resistor that is auto-controlled to auto-connect the open-triangle coil of 6 kV measurement transformer at the moment of earth fault. This automatic connection aims to increase the relay sensitivity as well as reduce the overvoltage. The finding results are sensitivity factors of relay and voltage magnitudes of healthy phases, which will be compared with corresponding values when there is no connection of resistor to prove the effectiveness of the method.


Originality.
A useful method is proposed for increasing the earthing current to enhance the sensitivity of earthing relay.


Practical value.
The proposed control diagram could be used to design a device aiming to improve the safety of 6 kV grid in open pit mines when earth faults occur.



Keywords:
6 kV grid, open pit mine, sensitivity, over-voltage

References.


1. QCVN 01:2011/BCT, 2011. Vietnam National regulation on safety Mining (n.d.). Retrieved from http://www.kiemdinh.vn/upload/files/QCVN%2001-2011-BCT%20An%20toa%CC%80n%20trong%20khai%20tha%CC%81c%20than%20h%C3%A2%CC%80m%20lo%CC%80.pdf.

2. Thanh, L.X., & Bun, H.V. (2021). Identifying the efficiency decrease factor of motors working under power harmornic in 660 V electric mining grids. Mining of Mineral Deposits, 15(4), 108-113. https://doi.org/10.33271/mining15.04.108.

3. TCVN 6780-4, 2009, Ministry of Industry National Technical safety Regulation on Underground mines (n.d.). Retrieved from https://tieuchuan.vsqi.gov.vn/tieuchuan/view?sohieu=TCVN+6780-4%3A2009.

4. Bekbaev, A.B., Sheryshev, V.P., Sarsenbaev, E.A., & Kalikasov,N.T. (2021). Intellectualization of the process of measuring the temperature of inaccessible surfaces of electric contact connections. Vestnik KazNRTU, 172-179. https://doi.org/10.51301/vest.su.2021.i4.22.

5. Narayan, S. (2019). Earthing Systems and Earth Fault Protection in Power System Distribution Network. Research Project report, University of Southern Queensland. Retrieved from https://eprints.usq.edu.au/43125/12/Narayan_S_Quinton_Redacted.pdf.

6. Ghanbari, T., Samet, H., & Ghafourifard, J. (2016). New approach to improve sensitivity of differential and restricted earth fault protections for industrial transformers. IET Generation, Transmission & Distribution, 10(6), 1486-1494. https://doi.org/10.1049/iet-gtd.2015.1343.

7. Rorabaugh, J., Swisher, A., Palma, J., Andaya, G., Webster, M., Kirkpatrick, B., & Tran, T. (2020). Resonant Grounded Isolation Transformers to Prevent Ignitions From Powerline Faults. IEEE Transactions on Power Delivery, 36(4), 2287-2297. https://doi.org/10.1109/TPWRD.2020.3030220.

8. Bun, H.V., & Thanh, L.X. (2019). Impact of power harmonics on precise and discriminative tripping of the relay system for earthing protection in underground 6 kV grids of Qung Ninh underground mines. Empowering Science and Mathematics for Global Competitiveness, (2-4), 28-34. https://doi.org/10.1201/9780429461903-5.

9. Topolnek, D., Toman, P., Orsgov, J., Kopika, M., & Dvok,J. (2014). The evaluation of overvoltage during short-time additional earthing of healthy phase for fault location in MV networks. Developments in Power System Protection, 48-56. https://doi.org/10.1049/cp.2014.0160.

10. Sutherland, P., & Mansoor, A. (2005). A new method for testing and calibration of high-resistance grounding systems. Electricity Distribution, 1-4. https://doi.org/10.1049/cp:20051165.

11. habrol, A., & Hunt, S. (2015). Assessment of logic algorithms for faulted phase earthing protection relays on 10 kV networks. Electricity Distribution, 15-18, 0044.

12. Bun, H.V., & Thanh, L.X. (2016). An effective solution for reducing the overvoltage level when there is an one phase earthing on 6 kV grids of cement manufacturing enterprises. Electro-mechanics for Mining and Geo-resources Development, 91-99.

13. Kadyrov, A.S. (2017). Protection of 635 kV grids against overvoltage, selection of the neutral mode according to the overvoltage criterion. Izvestiya Kyrgyzskogo gosudar-stvennogo tekhnicheskogo universiteta, (4), 138-145.

14. Ermolaev, V.A., Potapchuk, N.K., & Zaydullina, K.A. (2018). Neutral grounding modes in electrical systems. Electrical Complexes and Systems, 203-206.

15. Sinchuk, O., Sinchuk, I., Beridze, T., Filipp, Y., Budnikov, K., Dozorenko,O., & Strzelecki, R. (2021). Assessment of the factors influencing on the formation of energy-oriented modes of electric power consumption by water-drainage installations of the mines. Mining of Mineral Deposits, 15(4), 25-33. https://doi.org/10.33271/mining15.04.025.

16. Suhono, S., Purnama, H., & Utomo, H.B. (2019). Ground fault protection using open break delta grounding transformer in ungrounded system. Logic. Jurnal Rancang Bangun dan Teknologi, 19(1), 34-40. https://doi.org/10.31940/logic.v19i1.1275.

17. Hufnagl, E., Fickert, L., & Schmautzer, E. (2015). Efficient calculation of earth fault currents in compensated networks. Komunalna Energetika Power Engineering. Maribor, Slovenia. Retrieved from https://graz.pure.elsevier.com/en/publications/efficient-calculation-of-earth-fault-currents-in-compensated-netw.

18. Lowczowski, K., Lorence, J., Andruszkiewicz, J., Nodolny, Z., & Zawodniak, J. (2019). Novel Earth Fault Protection Algorithm Base on MV Cable Screen zero sequence current filter. Energies, 12(16), 3190. https://doi.org/10.3390/en12163190.

 

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ISSN (print) 2071-2227,
ISSN (online) 2223-2362.
Journal was registered by Ministry of Justice of Ukraine.
Registration number КВ No.17742-6592PR dated April 27, 2011.

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