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Questions and Answers
What is the primary function of low-impedance grounding?
What is the primary function of low-impedance grounding?
- To eliminate the need for reactors or resistors in the system neutral
- To limit the fault current and permit selective protective relaying (correct)
- To increase the fault current to match the power system impedances
- To increase the line-to-neutral equipment insulation requirements
What is the typical location of a low-impedance grounding device in a distribution station?
What is the typical location of a low-impedance grounding device in a distribution station?
- In the primary of the delta-wye supply transformer
- In the secondary of the wye-delta supply transformer
- In the neutral of the delta-wye supply transformer (correct)
- In the neutral of the wye-delta supply transformer
What is the advantage of using line-to-neutral equipment insulation in a low-impedance grounded system?
What is the advantage of using line-to-neutral equipment insulation in a low-impedance grounded system?
- It increases the fault current rating
- It is not affected by the ground faults (correct)
- It reduces the cost of the overall system
- It provides a higher level of protection
What is the purpose of a wye-grounded-delta transformer or a zigzag transformer in a low-impedance grounding system?
What is the purpose of a wye-grounded-delta transformer or a zigzag transformer in a low-impedance grounding system?
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What is the range of line-to-ground fault currents in a low-impedance grounded system?
What is the range of line-to-ground fault currents in a low-impedance grounded system?
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What is the purpose of the zero-sequence network shown in Figure 7.15?
What is the purpose of the zero-sequence network shown in Figure 7.15?
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