🔍 Key Concepts

• distributive capacitance to ground on an ungrounded three-phase system • how an intermittent ground briefly connects one phase to ground and shifts the phase-to-ground voltages • the sequence of events: first contact, break, second contact, break, and how the waveform amplitude labels (391, 782, 1173) change at each step

💭 Think About

• Look at figure A and ask: Is the phase on the right actually connected to ground yet, or is the system still only capacitively referenced to ground? • Compare the waveform in A with the waveform in B: what new connection exists in B that is not yet present in A? • Track the numerical voltage values in each figure. Do they show the system just before a change in grounding, just after making contact, or just after breaking contact?

✅ Before You Answer

• Verify whether the switch symbol in figure A is open or closed relative to ground. • Confirm if the only reference to ground in figure A is through Cgnd (capacitive ground), or if there is also a direct fault path. • Check whether the labeled voltage in A (around 391 V) indicates the original, undisturbed phase-to-ground voltage before any intermittent ground contact occurs.