As of my last knowledge update in September 2021, the term "transformer short-circuit withstand capability" is not a widely recognized or standard term in the field of electrical engineering or power systems. However, I can provide some insights based on the information available up until that point.
In the context of transformers and power systems, "short-circuit withstand capability" generally refers to the ability of a transformer to withstand the mechanical and thermal stresses that occur during a short-circuit fault without suffering catastrophic failure. Short-circuit faults are sudden electrical faults that can occur due to insulation breakdown, faults in transmission lines, or other factors. These faults can lead to extremely high currents flowing through the transformer windings, which can cause mechanical forces, overheating, and potentially damaging effects.
To ensure the safety and reliability of power systems, transformers are designed to withstand these short-circuit conditions without failing. Design considerations include:
Mechanical Strength: The transformer's mechanical structure should be designed to withstand the forces generated by the short-circuit current without structural damage.
Thermal Performance: The transformer's winding and insulation materials should be capable of handling the heat generated during a short-circuit event. Rapid and high-current short-circuits can cause significant temperature rises that might damage the insulation and lead to failure.
Electrical Performance: The electrical insulation between winding turns, layers, and phases should be capable of preventing short-circuit-induced breakdowns.
Protective Devices: Protective relays and circuit breakers are used to detect and isolate short-circuit faults quickly, minimizing the stress on the transformer.
System Analysis: Power system engineers perform short-circuit studies to determine the expected fault currents and the resulting stresses on transformers. This information is used in the design and selection of transformers.
It's important to note that terms and concepts within specialized fields can evolve, and new terms may emerge over time. If "transformer short-circuit withstand capability" has become a recognized term in the field since September 2021, I might not be aware of it. If you're looking for the most up-to-date information, I recommend consulting recent literature, standards, or experts in the field of electrical engineering or power systems.