Suppose an ungrounded 3-phase distribution...

Question 1 / 2066636eed28f7522a1c51dc2b

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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🔍 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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Question 1 of 20

One lamp would be extremely bright and the others would be extremely dim or go out

One lamp would be extremely dim or go out and the others would be extremely bright

All three lamps would be extremely dim or go out

All three lamps would be extremely bright

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Question 1 / 2066636eed28f7522a1c51dc2b

Question 1 of 2066636eed28f7522a1c51dc2b

Back

Question 1 of 20

66636eed28f7522a1c51dc2b

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🔍 Key Concepts

💭 Think About

✅ Before You Answer

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