Abstract
In this paper, the classic optimization model applied to coordinate 67 directional overcurrent relays in interconnected systems is applied to coordinate 67N neutral directional overcurrent relays. To do so, single-phase to neutral short-circuit currents are determined using the multiphase-multiground (4-wire) network model developed by EPRI for the OpenDSS platform. The OpenDSS network model is based on primitive impedances. This model overcomes the limitations of symmetrical components by including the effect of unbalanced loads, systems with different X/R ratios, neutral grounding through earth resistances and fault impedances on short-circuit currents passing through all relays of the system. As a key contribution, we investigate the impact of high-impedance single-phase to neutral/earth faults in the optimal clearing times and selectivity of the protection system. The results show the optimal operation time decreases as the fault impedance increases until the calculated time dial setting stagnates at the minimum value. Beyond this point, the clearing times reach a minimum and deteriorate as far the fault impedance increases.
| Original language | English (US) |
|---|---|
| Title of host publication | 2020 IEEE Industry Applications Society Annual Meeting, IAS 2020 |
| Publisher | Institute of Electrical and Electronics Engineers Inc. |
| ISBN (Electronic) | 9781728171920 |
| DOIs | |
| State | Published - Oct 10 2020 |
| Externally published | Yes |
| Event | 2020 IEEE Industry Applications Society Annual Meeting, IAS 2020 - Detroit, United States Duration: Oct 10 2020 → Oct 16 2020 |
Publication series
| Name | 2020 IEEE Industry Applications Society Annual Meeting, IAS 2020 |
|---|
Conference
| Conference | 2020 IEEE Industry Applications Society Annual Meeting, IAS 2020 |
|---|---|
| Country/Territory | United States |
| City | Detroit |
| Period | 10/10/20 → 10/16/20 |
UN SDGs
This output contributes to the following UN Sustainable Development Goals (SDGs)
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SDG 1 No Poverty
All Science Journal Classification (ASJC) codes
- Process Chemistry and Technology
- Electrical and Electronic Engineering
- Industrial and Manufacturing Engineering
- Mechanics of Materials
- Materials Science (miscellaneous)
- Materials Chemistry
- Filtration and Separation
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