Which outcome occurs when a ground fault occurs in an ungrounded three-phase electrical system?

💡 Explanation

When a ground fault occurs in an ungrounded system, the fault current is limited, but the voltage on the remaining unfaulted phases increases to line-to-line voltage because the faulted phase potential is shifted to ground. Therefore voltage increases, rather than unbalanced line voltages or immediate tripping, which require grounded systems and specific fault current thresholds.

• Which risk increases when an aircraft experiences prolonged flight in supercooled large droplet (SLD) conditions?
• Which increased risk arises when machining aluminum housing while neglecting thermal expansion tolerances?
• Which control issue arises when wear affects quadrature encoder signals in a robotic arm's joints?
• Which type of dimensional inaccuracy results when thermal gradients cause differential expansion in a CNC lathe's mechanical structure?
• Which consequence results when servo flutter occurs in aircraft elevator controls?
• Which risk increases when a PLC’s scan cycle exceeds defined limits in a robotic assembly line?