Which outcome occurs when overcurrent causes excessive *I²R* heating in power transformer's winding circuit?

💡 Explanation

Polymer impregnation failure accelerates because *I²R* heating increases temperature, which lowers the dielectric strength through thermal runaway; therefore the polymer degrades rapidly rather than the magnetic core properties being immediately affected. Its breakdown then leads to shorts.

• Which outcome occurs when a hydraulic valve in a large construction excavator experiences spool binding?
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