Suppose an ungrounded 3-phase distribution...

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Question 1 of 2066636eed28f7522a1c51dc2b

Suppose an ungrounded 3-phase distribution system is fitted with a lamp-type ground detecting circuit with 3 lamps. If an accidental ground is displayed continuously, what is the indication on the switchboard of a single grounded conductor?

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Question 1 of 20

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🔍 Key Concepts

• Ungrounded 3‑phase systems and how phase-to-ground voltage behaves if one line becomes grounded • How a 3-lamp ground detector is normally connected and what equal brightness indicates • What happens to the voltage across each lamp when one phase is solidly grounded

💭 Think About

• First picture a healthy, ungrounded 3‑phase system: what is the relationship of each phase to ground, and how would that make the three lamps appear? • Now imagine one phase is accidentally grounded: what happens to the phase-to-ground voltage on the grounded phase versus the other two phases? • Based on those voltage changes, which lamp (on the grounded phase or the healthy phases) would have the least voltage across it, and which would have the most?

✅ Before You Answer

• Be clear whether the grounded conductor’s lamp sees zero or increased voltage to ground in an ungrounded system when that phase faults to ground • Confirm that the other two phases now have a higher phase-to-ground voltage than before the fault • Match your choice to a pattern where one lamp behaves differently from the other two, consistent with your voltage reasoning

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