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System Voltage and Source Impedance

The prospective short-circuit current at a fault location in a power system depends on:
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Answer & Explanation
Correct AnswerD. System voltage and equivalent source impedance upto the fault location

Quick Explanation

The prospective fault current is the current the network would supply into the fault before protective devices limit or interrupt it. It is determined by the prefault system voltage and the equivalent Thevenin impedance seen from the fault point.

Formula / Key Relation

Isc ≈ Vth / Zth
System Voltage and Source Impedance explanatory diagram

Detailed Explanation

Correct Answer

D — System voltage and equivalent source impedance upto the fault location

Explanation

The prospective fault current is the current the network would supply into the fault before protective devices limit or interrupt it. It is determined by the prefault system voltage and the equivalent Thevenin impedance seen from the fault point.

Key Concept

System Voltage and Source Impedance

Formula

Isc ≈ Vth / Zth

Exam Point

Fault current = available voltage ÷ source impedance.

Quick Trick

Fault current = available voltage ÷ source impedance.

Exam Tip

Fault current = available voltage ÷ source impedance.

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