High sensitivity longitudinal current differential protection for grounding faults in low resistance grounding distribution network

Gang Wang

doi:10.1117/12.3004332

25 September 2023 High sensitivity longitudinal current differential protection for grounding faults in low resistance grounding distribution network

Gang Wang

Author Affiliations +

Proceedings Volume 12788, Second International Conference on Energy, Power, and Electrical Technology (ICEPET 2023); 127885V (2023) https://doi.org/10.1117/12.3004332
Event: Second International Conference on Energy, Power, and Electrical Technology (ICEPET 2023), 2023, Kuala Lumpur, Malaysia

Abstract

The longitudinal current differential protection of low resistance grounding distribution network exists the problem of setting the protection threshold too high, which may refuse to operate in the event of high resistance fault. This paper analyzes the characteristics of single phase grounding fault in low resistance grounding distribution network and finds that the zero sequence differential current in the fault section is much greater than that in the sound section, and is independent of the fault resistance. Therefore, this paper proposes a highly sensitive longitudinal current differential protection method, which reduces the threshold of existing differential protection and enables differential protection to still operate in the event of high resistance grounding fault. At the same time, through the coordination of time limits, it ensures that the differential current of the sound section will not malfunction when it exceeds the low threshold. This method combines the sensitivity of protection during high resistance grounding fault and the selectivity of protection during low resistance grounding fault, with a resistance to fault resistance of up to 2000 Ω. Through model simulation, this method is practical and feasible

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Gang Wang "High sensitivity longitudinal current differential protection for grounding faults in low resistance grounding distribution network", Proc. SPIE 12788, Second International Conference on Energy, Power, and Electrical Technology (ICEPET 2023), 127885V (25 September 2023); https://doi.org/10.1117/12.3004332

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KEYWORDS

Capacitance

Fiber optic communications

Optical communications

Reflection

Inductance

Portability

Power supplies

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