Investigation of the Effect of Current Protections in Conditions of Single-Phase Ground Fault through Transient Resistance in the Electrical Networks of Mining Enterprises
Abstract
:1. Introduction
- The increase in the length and branching of medium-voltage air-cable and cable lines and the complexity of the MV grid with respect to the technological cycle application requires a timely update of the operation settings in order to preserve sufficient sensitivity in the protection behavior of the SPGF mode;
- The variety of SPGF modes and the places of their occurrence in the electrical network must be considered. For example, the arc SPGF (ASPGF) in the power supply system leads to overvoltage, exceeding the nominal value by 3–4 times. This causes deterioration of the insulation properties of electrical installations, accelerates the aging process, and, as a result, contributes to the premature failure of electrical equipment and increases the risk of electrical injuries of service personnel, unauthorized persons, and animals accidentally caught at the accident site [10];
- The calculation of the protection settings is straightforward in the case of a metallic SPGF mode. The incomplete ground fault (GF) mode is often accompanied by the presence of transient resistance at the point of fault, reaching values of several kilo-ohms [11]. The constant changing of the values of the zero-sequence current during the operation of 6–35 kV electrical networks (the conductivity of line phases relative to the ground, the parameters of neutral circuit grounding) causes additional difficulties in solving the problem of ensuring the stable functioning of protections in incomplete single-phase short circuit modes (through transient resistance).
2. Problem Statement
3. Materials and Methods
- Measurement of the current and voltage of the zero-sequence in the metal SPGF mode has been performed;
- In parallel to the load at point K1, resistances of various sizes ranging from 0 kOhm to 100 kOhm were connected in order to simulate the incomplete SPGF mode with different ground fault completeness factors;
- The values of the voltage and current of the zero-sequence circuit were recorded in the incomplete SPGF mode;
- On the basis of the experimental zero-sequence parameter values, the protection sensitivity factor was calculated in the incomplete SPGF mode with a different ground fault completeness factor.
4. Discussion
5. Conclusions
Author Contributions
Funding
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Cable Line | Cable Cross Section Scl, mm2 | Cable Length li, km | Capacity Ci, µF/km | Resistance R, ohm/km | Inductance L, mH/km |
---|---|---|---|---|---|
1 | 120 | 6 | 0.418 | 0.196 | 0.268 |
2 | 120 | 3.217 | 0.418 | 0.196 | 0.268 |
3 | 50 | 0.056 | 0.292 | 0.494 | 0.313 |
4 | 95 | 0.163 | 0.380 | 0.247 | 0.278 |
5 | 120 | 7.755 | 0.418 | 0.196 | 0.268 |
6 | 50 | 0.07 | 0.292 | 0.494 | 0.313 |
Experiment | Resistance Ri, Ω | Factor ß | Zero-Sequence Current 3I0, mA | Zero-Sequence Voltage 3U0, V |
---|---|---|---|---|
1 | 0 | 1 | 15,121 | 5700 |
2 | 2500 | 0.232 | 1100 | 924 |
3 | 5000 | 0.128 | 185 | 475 |
4 | 10,000 | 0.067 | 173 | 254 |
5 | 25,000 | 0.028 | 147 | 142 |
6 | 50,000 | 0.014 | 77 | 46.2 |
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Ustinov, D.; Nazarychev, A.; Pelenev, D.; Babyr, K.; Pugachev, A. Investigation of the Effect of Current Protections in Conditions of Single-Phase Ground Fault through Transient Resistance in the Electrical Networks of Mining Enterprises. Energies 2023, 16, 3690. https://doi.org/10.3390/en16093690
Ustinov D, Nazarychev A, Pelenev D, Babyr K, Pugachev A. Investigation of the Effect of Current Protections in Conditions of Single-Phase Ground Fault through Transient Resistance in the Electrical Networks of Mining Enterprises. Energies. 2023; 16(9):3690. https://doi.org/10.3390/en16093690
Chicago/Turabian StyleUstinov, Denis, Aleksander Nazarychev, Denis Pelenev, Kirill Babyr, and Andrey Pugachev. 2023. "Investigation of the Effect of Current Protections in Conditions of Single-Phase Ground Fault through Transient Resistance in the Electrical Networks of Mining Enterprises" Energies 16, no. 9: 3690. https://doi.org/10.3390/en16093690