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Power System Protection Quiz: Zero Sequence Impedance and Faults

12 Questions

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Power System Protection Quiz: Zero Sequence Impedance and Faults

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Questions and Answers

What is the consequence of having the zero sequence impedance as ∞ during line to line faults?

The fault current will be minimum

The fault current will be infinite

The fault current will be zero (correct)

The fault current will be maximum

If the neutral is not grounded during a single line to ground fault, what will be the effect on the zero sequence impedance?

The zero sequence impedance will be maximum

The zero sequence impedance will remain the same

The zero sequence impedance will become infinite (correct)

The zero sequence impedance will become zero

What is the result of zero sequence currents when the neutral in a Y connection is absent?

Minimum

Infinite

Zero

Maximum (correct)

When there is no neutral, what is the value of Z0?

Same as negative sequence Signup and view all the answers

How does the value of zero sequence current compare to the current in the neutral wire?

$3$ times the current in the neutral wire Signup and view all the answers

What components make up a balanced three-phase system?

Positive, negative and zero sequence currents Signup and view all the answers

What is the sum of negative and zero sequence currents in case of an LLG fault?

$I_n + I_0$ Signup and view all the answers

In which of the following connections can zero sequence currents flow?

Star Signup and view all the answers

What is the primary purpose of using series reactors in power systems?

Limit fault levels within equipment capacity Signup and view all the answers

Among the listed options, what factor(s) determine the magnitude of fault current?

Both total impedance up to the fault and voltage at the fault point Signup and view all the answers

Which type of fault is the most commonly observed in power systems?

Single line to ground fault Signup and view all the answers

During a single line to ground fault where the fault occurs in phase A, what are the terminal conditions?

$V_a = 0, I_a = 0, I_c = 0$ Signup and view all the answers