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lf "x" is the allowable voltage variation in transmission and distribution systems, determine the value of "x". 
1. ±1%
2. ±10%
3. ±0.001%
4. ±12%

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Correct Answer - Option 2 : ±10%

Voltage drop in Transmission line and Distribution line:

  • Voltage drop is important for both transmission and distribution lines.
  • Standard allowable drop is typically not more than (± 10%) of nominal or rated line voltage.
  • Voltage drop that exceeds the allowable variance is more of a problem with distribution because distribution lines are more directly affected by motors and other intermittent loads that have a high starting current.
  • Voltage variations in 33 kV and 11kV feeders should not exceed the following limits at the farthest end under peak load conditions and normal system operation.
    • Above 33kV: ± 10%
    • Up to 33kV: ± 9%
    • Low voltage: ± 6%

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