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The voltage regulation of flat voltage profile system is
100%
50%
0%
Any of the above
0%
Voltage regulation is a measure of the change in voltage at the receiving end of a transmission line when the load changes from full load to no load. In a flat voltage profile system, the receiving end voltage (VRтАЛ) is maintained equal to the sending end voltage (VSтАЛ) regardless of the load, resulting in zero change.
Voltage regulation is a measure of the change in voltage at the receiving end of a transmission line when the load changes from full load to no load. In a flat voltage profile system, the receiving end voltage (VRтАЛ) is maintained equal to the sending end voltage (VSтАЛ) regardless of the load, resulting in zero change.
Voltage┬аRegulation=тИгVFLтАЛтИгтИгVNLтАЛтИгтИТтИгVFLтАЛтИгтАЛ├Ч100% тАФ General formula for voltage regulation
VNLтАЛ=VFLтАЛ тАФ Condition for a flat voltage profile
The voltage regulation is defined as тИгVFLтАЛтИгтИгVNLтАЛтИгтИТтИгVFLтАЛтИгтАЛ├Ч100%. In a flat voltage profile, VNLтАЛ=VFLтАЛ at all times, typically achieved through reactive power compensation (like SVCs or synchronous condensers). Consequently, the difference between no-load and full-load voltage is zero.
Voltage regulation indicates the sensitivity of the voltage to load variations.
A 'flat voltage profile' implies that the voltage remains constant across the entire length of the transmission line.
This condition is ideal in EHV/UHV systems to prevent insulation stress and improve stability.
Minimizes dielectric stress on insulation
Improves system steady-state stability
Reduces transmission losses by maintaining optimal voltage levels
Requires complex and expensive compensation equipment
Adds to system control complexity
EHV (Extra High Voltage) transmission lines
Long-distance AC transmission corridors
In practical systems, perfect 0% regulation is difficult to achieve; therefore, utilities aim for a 'near flat' profile.
Option A (100%) represents a case where the load voltage is half the no-load voltage, indicating poor regulation.
C is correct тАФ A flat voltage profile implies that the receiving end voltage is identical to the sending end voltage at all load levels, resulting in zero percent voltage regulation.
Always remember that in power systems, 'flat profile' is synonymous with constant voltage, whereas 'regulation' measures the deviation from that constant ideal.