Electrical Engineering (EE) Exam > Electrical Engineering (EE) Questions > A balanced 3-phase system consists of -a)Zero...
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A balanced 3-phase system consists of -
- a)Zero sequence currents only
- b)Positive sequence currents only
- c)Negative and zero sequence currents
- d)Zero, negative and positive sequence currents
Correct answer is option 'B'. Can you explain this answer?
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Most Upvoted Answer
A balanced 3-phase system consists of -a)Zero sequence currents onlyb)...
Introduction:
A balanced 3-phase system is a type of electrical power distribution system in which the three phases are equal in magnitude and have a phase difference of 120 degrees. In such a system, the currents flowing through the three phases can be categorized into different sequence components, namely positive sequence, negative sequence, and zero sequence.
Explanation:
The correct answer to the given question is option 'B', which states that a balanced 3-phase system consists of positive sequence currents only. Let's understand why this is the correct answer.
Positive Sequence Currents:
Positive sequence currents are the currents that flow in a sequence where the phase angles of the currents are in ascending order. In a balanced 3-phase system, the positive sequence currents have the same magnitude and a phase difference of 120 degrees.
Zero Sequence Currents:
Zero sequence currents are the currents that flow in a sequence where the phase angles of the currents are all the same. In a balanced 3-phase system, the zero sequence currents have the same magnitude and a phase difference of 0 degrees.
Negative Sequence Currents:
Negative sequence currents are the currents that flow in a sequence where the phase angles of the currents are in descending order. In a balanced 3-phase system, the negative sequence currents have the same magnitude and a phase difference of 240 degrees.
Explanation of the Correct Answer:
The correct answer to the given question is option 'B' because in a balanced 3-phase system, the currents flowing through the three phases have a positive sequence only. This means that the phase angles of the currents are in ascending order, and they have the same magnitude. The absence of negative and zero sequence currents in a balanced 3-phase system is due to the symmetrical nature of the system.
Conclusion:
In conclusion, a balanced 3-phase system consists of positive sequence currents only. This means that the currents flowing through the three phases have the same magnitude and a phase difference of 120 degrees. The absence of negative and zero sequence currents is due to the symmetrical nature of the system.
A balanced 3-phase system is a type of electrical power distribution system in which the three phases are equal in magnitude and have a phase difference of 120 degrees. In such a system, the currents flowing through the three phases can be categorized into different sequence components, namely positive sequence, negative sequence, and zero sequence.
Explanation:
The correct answer to the given question is option 'B', which states that a balanced 3-phase system consists of positive sequence currents only. Let's understand why this is the correct answer.
Positive Sequence Currents:
Positive sequence currents are the currents that flow in a sequence where the phase angles of the currents are in ascending order. In a balanced 3-phase system, the positive sequence currents have the same magnitude and a phase difference of 120 degrees.
Zero Sequence Currents:
Zero sequence currents are the currents that flow in a sequence where the phase angles of the currents are all the same. In a balanced 3-phase system, the zero sequence currents have the same magnitude and a phase difference of 0 degrees.
Negative Sequence Currents:
Negative sequence currents are the currents that flow in a sequence where the phase angles of the currents are in descending order. In a balanced 3-phase system, the negative sequence currents have the same magnitude and a phase difference of 240 degrees.
Explanation of the Correct Answer:
The correct answer to the given question is option 'B' because in a balanced 3-phase system, the currents flowing through the three phases have a positive sequence only. This means that the phase angles of the currents are in ascending order, and they have the same magnitude. The absence of negative and zero sequence currents in a balanced 3-phase system is due to the symmetrical nature of the system.
Conclusion:
In conclusion, a balanced 3-phase system consists of positive sequence currents only. This means that the currents flowing through the three phases have the same magnitude and a phase difference of 120 degrees. The absence of negative and zero sequence currents is due to the symmetrical nature of the system.
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Community Answer
A balanced 3-phase system consists of -a)Zero sequence currents onlyb)...
A balanced 3-phase system consists only of positive sequence current components.
- A 3-phase power system consists of three different types of sequence components i.e. positive, negative, and zero sequence components.
- If the magnitude of all three phases is equal and the phase displacement between all three phases is equal to 120 degrees, then the system is said to be balanced otherwise unbalanced.
- For a balanced system, only positive sequence components of voltage and current are present.
- For an unbalanced system positive, negative and zero sequence components of voltage and current are present.
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A balanced 3-phase system consists of -a)Zero sequence currents onlyb)Positive sequence currents onlyc)Negative and zero sequence currentsd)Zero, negative and positive sequence currentsCorrect answer is option 'B'. Can you explain this answer?
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