Overcurrent
In an
current limiters are commonly used overcurrent protection (OCP) mechanisms to control the risks
.
Circuit breakers, relays, and fuses protect circuit wiring from damage caused by overcurrent.[1]
Overcurrent in an electrical grid
Overcurrent capabilities of
weak grid creates a multitude of problems, including:[2]
- transients during the large load changes will cause large variations of the grid voltage, causing problems with the loads (e.g., some motors might not be able to start in the undervoltagecondition);
- the grid protection devices are designed to be triggered by a sufficient level of overcurrent. In a weak system the short circuit current might be hard to distinguish from a normal transient overcurrent encountered during the load changes;
- during a black start operation after a failure, large inrush current might be needed to energize the system components. For example, if some loads in a weak system remain connected, and inverter-based resource might not be able to start.
Related standards
- IEC 60364-4-43: Electrical installations of buildings – Part 4-43: Protection for safety – Protection against overcurrent
See also
- Current limiting
- Electrical fault
- Electrical safety
- Overvoltage
References
- Science Direct. Retrieved July 5, 2021.
- ^ Li, Nie & Wang 2022, p. 536.
Sources
- Li, Haiguo; Nie, Cheng; Wang, Fred (2022). "Grid Strengthening IBR: An Inverter-Based Resource Enhanced by a Co-Located Synchronous Condenser for High Overcurrent Capability". IEEE Open Journal of Power Electronics. 3. Institute of Electrical and Electronics Engineers (IEEE): 535–548. S2CID 251194445.
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