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 malfunction indicates excessive reverse saturation current at BJT junction?
• Which outcome occurs when germanium diodes exceed reverse voltage?
• Which risk increases when advanced timing causes excessive pressure in stratified-charge engine piston?
• Which risk increases when reactive var compensation inadequately corrects transmission-line voltage sags during heavy inductive loading of an electrical grid?
• Which risk increases when a refrigeration system's pressure relief valve fails?
• Which risk greatly increases when quadrature amplitude modulation (QAM) symbol constellations are transmitted through nonlinear fiber optic channels and strong laser signal?