In a balanced three-phase system, the three phases are separated by a phase angle of 120°. This is true for both line-to-line and line-to-neutral voltages. Let's consider the line-to-line voltages. These voltages are the voltages measured between any two of the three lines. Because the phase voltages are 120° apart, the line-to-line voltages are also 120° apart.
To visualize this, imagine a phasor diagram. Each phase voltage would be represented by a phasor, and the angle between consecutive phasors would be 120°. The line-to-line voltages are the vector differences between these phase voltages, and these differences also result in a 120° angle between them. This 120° phase difference is a fundamental characteristic of balanced three-phase systems, ensuring that the total instantaneous power delivered is constant, minimizing fluctuations and making the system more efficient. Therefore, the correct answer is 120°.
Similar Questions
A three phase circuit is connected with balanced delta connected load of impedance 100 Ω. If the current in each phase is 5 A, the voltage across each load will be
- In a balanced 3 phase circuit, neutral current is always ________.
Which of the following is true when there is an unbalanced star connected load in a three-phase system?
Which of the following statements about a star connected three phase system is correct?
Which of the following is a possible cause of an unbalanced load in a three-phase system?
Which of the following is true for a system with an unbalanced load of a three-phase system?
- If the load on a three-phase system is unbalanced, the power calculation becomes more complex because
- In an unbalanced three-phase system, the neutral current will
- The total power delivered by a balanced three-phase system is
Important Questions from Three Phase Circuits
In a balanced three-phase, star-connected system, the phase difference between phase voltages and their respective line voltages is:
Three equal impedances are first connected in star across a balanced 3 phase supply. If connected in delta across the same supply
The power taken by a 3-ϕ load is given by the expression
A three phase circuit is connected with balanced delta connected load of impedance 100 Ω. If the current in each phase is 5 A, the voltage across each load will be
A load of three impedances each (6 + j9) is supplied through a line having an impedance of (1 + j2) Ω. The supply voltage is 400 V at 50 Hz. Determine input and output powers respectively when the load is star connected.
