Overcurrent

<h2 id="overcurrent-in-an-electrical-grid">Overcurrent in an electrical grid</h2>
<p>Overcurrent capabilities of <a href="/facts/Electrical_generator/5sATsUGX">electrical generators</a> are essential for the <a href="/facts/Power_system_operations/R9mKeJL2">power system operations</a>. Lack of overcurrent capability (low <a href="/facts/Short_circuit_ratio_(electrical_grid)/HTCMnJwo">short circuit ratio</a>) of a <a href="/facts/Weak_grid/HTCMnJwo">weak grid</a> creates a multitude of problems, including:<a class="footnote-ref" id="fnref:2" href="#fn:2"><sup>2</sup></a> 
</p>
<ul><li>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 <a href="/facts/Undervoltage/DS6bH6Nh">undervoltage</a> condition);</li>
<li>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;</li>
<li>during a <a href="/facts/Black_start/c9gASxr6">black start</a> operation after a failure, large <a href="/facts/Inrush_current/0qg0rKmL">inrush current</a> might be needed to energize the system components. For example, if some loads in a weak system remain connected, and <a href="/facts/Inverter-based_resource/asTJDPGs">inverter-based resource</a> might not be able to start.</li></ul>
<h2 id="related-standards">Related standards</h2>
<ul><li><a href="/facts/IEC_60364/70H4qc1y">IEC 60364</a>-4-43: Electrical installations of buildings – Part 4-43: Protection for safety – Protection against overcurrent</li></ul>
<h2 id="see-also">See also</h2>
<ul><li><a href="/facts/Current_limiting/YjYf608t">Current limiting</a></li>
<li><a href="/facts/Electrical_fault/QaCmxu1r">Electrical fault</a></li>
<li><a href="/facts/Electrical_safety/4qyfhmyW">Electrical safety</a></li>
<li><a href="/facts/Overvoltage/LsVwLvVQ">Overvoltage</a></li></ul>

<h2 id="sources">Sources</h2>
<ul><li>Li, Haiguo; Nie, Cheng; Wang, Fred (2022). <a href="https://doi.org/10.1109%2Fojpel.2022.3194849">"Grid Strengthening IBR: An Inverter-Based Resource Enhanced by a Co-Located Synchronous Condenser for High Overcurrent Capability"</a>. <i>IEEE Open Journal of Power Electronics</i>. 3. Institute of Electrical and Electronics Engineers (IEEE): 535–548. <a href="/facts/Doi_(identifier)/muM9Etpq">doi</a>:<a href="https://doi.org/10.1109%2Fojpel.2022.3194849">10.1109/ojpel.2022.3194849</a>. <a href="/facts/ISSN_(identifier)/DPAflDvU">ISSN</a> <a href="https://search.worldcat.org/issn/2644-1314">2644-1314</a>. <a href="/facts/S2CID_(identifier)/ldJsHa2Y">S2CID</a> <a href="https://api.semanticscholar.org/CorpusID:251194445">251194445</a>.</li></ul>

<h2 id="references">References</h2>

<ol>
<li id="fn:1"><p>Keller, Kimberley J. (2010). Overcurrent Protection. Butterworth-Heinemann. ISBN 978-1-85617-654-5. Retrieved July 5, 2021. {{cite book}}: |website= ignored (help) <a href="978-1-85617-654-5" target="_blank">978-1-85617-654-5</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li>
<li id="fn:2"><p>Li, Nie & Wang 2022, p. 536. - 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. doi:10.1109/ojpel.2022.3194849. ISSN 2644-1314. S2CID 251194445. <a href="https://doi.org/10.1109%2Fojpel.2022.3194849" target="_blank">https://doi.org/10.1109%2Fojpel.2022.3194849</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li>
</ol>

Overcurrent open-in-new

Overcurrent