Moderate
If the fault occurs near the impedance relay, the VII ratio will be____________?
Correct answer: B. lower than that of if fault occurs away from the relay
- A. constant for all distances
- B. lower than that of if fault occurs away from the relay
- C. higher than that of if fault occurs away from the relay
- D. none of the above
Explanation
Interpreting “VII ratio” as the V/I impedance ratio, a fault nearer the impedance relay gives a shorter line impedance and therefore a lower measured impedance than a distant fault. This is the operating principle used in distance protection.
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