When a three-phase transformer in a power distribution substation experiences an internal fault, which mechanism isolates the transformer while minimizing disruption?

💡 Explanation

Differential current protection activates when current imbalance exceeds a set threshold, indicating an internal fault, because it triggers circuit breakers to isolate the transformer. Therefore, fault current is rapidly stopped with localized impact, rather than causing widespread power outages.

• Which outcome occurs when aircraft landing gear oleo strut experiences viscous lock?
• In a diesel engine, which outcome increases with excessive fuel injected per cycle against a given cylinder's piston?
• Which safety outcome is compromised when a robot arm's joint sensors fail during inverse kinematics calculations?
• When forging turbine blades, which mechanism causes crystalline defects?
• Which consequence results when transformer saturation occurs due to a DC current component in a three-phase power distribution system?
• Which outcome occurs when water jet cutters experience blockages?