Which outcome occurs when metal oxidation undermines a transformer's bolted ground circuit?

💡 Explanation

Increased casing voltage arises because high fault currents cannot return to source through the weakened *ground impedance*, leading to elevated potential relative to true earth. Therefore, touch potential rises, rather than direct overcurrent or core saturation, because the fault is resistive.

• Which outcome predominates when hydraulic actuator rod seals degrade in a robotic arm operating at high cycles?
• Which outcome occurs when cryogenic fuel tank vent valves experience icing?
• Which outcome increases exhaust NOx levels when gasoline direct injection nozzles experience carbon buildup?
• Which risk increases when a pre-stressed concrete beam experiences sustained overloading beyond its design capacity?
• Which risk increases when transformer oil undergoes prolonged thermal stress in a high-voltage substation?
• Which outcome occurs when an internal combustion engine's fuel injector nozzle gets partially clogged with carbon deposits?