Line voltage and phase voltage

In a three-phase system, the line voltage is the potential difference between any two lines or phrases. The potential difference between any two phases is referred to as the phase voltage. The three-phase domestic power supply or 440 volts, is referred to as the line voltage. The potential difference between one of the phases and the neutral junction or between either of the phase voltages, is the single-phase 230 volts alternating current supply. A three-phase balanced system is one that takes into account all of the line voltages and currents. However, when unsymmetrical loads are applied, the system is known to be unbalanced.

Line voltage

Phases are conductors or windings of a coil that are present in Line Voltages. In a three-phase system, the line voltage is the potential difference between any two lines or phases; it is designated by V Line or VL-L. If R, Y and B represent the three phases (red, yellow and blue), then the voltage difference between R and Y, Y and B and B and R is the line voltage. Due to the continual variation in the line voltage of an alternating current system, there will always be two converter valves in the conducting state at any given time. 

In a three-balanced system, the potential difference between phases is always equal to the magnitude of the voltage and the phase angle and vector sum of the three phases are always zero. In simple terms, the line voltage is the voltage that a power line delivers to its destination or the point at which it is being used. If the Line Voltage raises unexpectedly, a condition known as a ‘power surge’ occurs. 

Phase voltage 

The phase voltage is the difference in potential between any of the phases (R, Y or B) and the neutral junction point. Vphase = VR (voltage in the red phase) = VB (voltage in the blue phase) = VY (voltage in yellow phase). The term “Phase Voltage” refers to the voltage applied to any one component of a balanced three-phase source or load. The voltage difference between two phases is referred to as phase-to-phase voltage.

The transformer’s distribution side is connected in a star design. For a three-phase network, the line to line voltage is √3 times the phase voltage. In general, phase to phase and line to line voltages are the same. A potential transformer can be used to measure line or phase voltages greater than 440 volts. The potential meter reduces the voltage from 110 volts to 63.5 volts by moving from a higher to a lower level.

Difference between line voltage and phase

What is the voltage phase?

Phase voltage is the voltage measured between any line and neutral. For instance, a 208/120-volt service has a line voltage of 208 Volts and a phase voltage of 120 Volts.

Conclusion 

The line voltage is the voltage that a power line delivers to its destination or the point at which it is being used. A three-balanced system takes into account all of the line voltages and currents. When unsymmetrical loads are applied, the system is known to be unbalanced. A potential meter reduces the voltage from 110 volts to 63.5 volts by moving from a higher to a lower level. A 208/120-volt service has a line voltage of 208 Volts and a phase voltage of 120 Volts.

This is because three-phase electricity has a higher power density than single-phase circuits. Three-phase power reduces harmonic currents and eliminates the requirement for large neutral lines. For instance, a 208/120-volt service has a line voltage of 208 Volts and a phase voltage of 120 Volts. The voltage between any two lines is referred to as line voltage.