What Is the Short Transmission Line Voltage Regulation Calculator?
Voltage regulation is the normalized voltage drop across a transmission line from sending end to receiving end under full load.
How Does the Short Transmission Line Voltage Regulation Calculator Work?
Calculates load current I = P / (√3 · V · pf).
Determines sending-end voltage through phasor projection.
Computes transmission losses 3·I²·R and line efficiency.
Short Transmission Line Voltage Regulation Calculator Formula & Variables
The core mathematical equation utilized by this calculator is expressed as:
VR% = [(Vs - Vr) / Vr] · 100%, Vs ≈ Vr + I·(R·cosφ ± X·sinφ)
Short transmission line phasor drop formula and percentage regulation.
How to Use the Short Transmission Line Voltage Regulation Calculator
- Input receiving voltage, power, and power factor.
- Enter total line series resistance and reactance.
Step-by-Step Example Calculation
33 kV Sub-transmission Feeder
Input Values:
receivingVoltage:33
loadPower:10
powerFactor:0.8
powerFactorType:lagging
resistance:2.5
reactance:4
Worked Steps: 33 kV sub-transmission feeder carrying 10 MW at 0.8 lagging.
Understanding Your Result
Primary output indicates voltage regulation percentage.
Summary displays sending voltage, losses, and efficiency.
Factors That Affect the Result
- Load power factor (leading power factor can produce negative regulation / voltage rise).
- Conductor gauge and spacing.
When Should You Use This Calculator?
- Sub-transmission and distribution feeder design and voltage regulator tap sizing.
Assumptions & Limitations
- Applicable to lines shorter than ~80 km where shunt capacitance is negligible.
Frequently Asked Questions
Calculation Accuracy & Reference Note
Standard short-line phasor approximation.