Which of the following statements about a star connected three phase system is correct?
The neutral wire carries no current in case of balanced ideal load.
To determine the correct statement about a star-connected three-phase system, let's analyze each option:
- The neutral wire has higher voltage than the phase wires.
This statement is incorrect. In a star connection, the neutral wire is at zero potential or ground potential, and each phase voltage is measured with respect to the neutral.
- There are two neutral wires in a star-connected three-phase system.
This statement is incorrect. A star-connected three-phase system typically has one neutral wire connecting the center points of the phase windings.
- The neutral wire carries no current in case of balanced ideal load.
This statement is correct. When the load is perfectly balanced, the sum of the currents flowing in the three phases is zero, hence no current flows through the neutral wire.
- The neutral wire is used for grounding purposes only.
This statement is incorrect. While the neutral wire can provide a grounding function, its primary role is to allow the return path for unbalanced currents and to stabilize phase voltages.
Conclusively, the correct statement is: The neutral wire carries no current in case of balanced ideal load.
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 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 a balanced three-phase system, the phase angles between the line-to-line voltages are
- 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
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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.
