If a phase sequence indicator rotates clockwise for a phase sequence of RYB, then what happens when the phase sequence is changed to BRYa)It will not rotate.b)It will rotate anticlockwise only.c)It will rotate clockwise or anticlockwise.d)It will rotate clockwise only.Correct answer is option 'D'. Can you explain this answer?

Question

Answer

Answer:

When a phase sequence indicator rotates clockwise for a phase sequence of RYB (Red, Yellow, Blue), it indicates the correct phase sequence of the three-phase power system. However, if the phase sequence is changed to BRY (Blue, Red, Yellow), the following will happen:

1. Direction of Rotation:
When the phase sequence is changed to BRY, the phase sequence indicator will still rotate. However, the direction of rotation will change from clockwise to anticlockwise. This change in direction is due to the change in the order of the phases.

2. Reason for Change in Rotation:
The phase sequence indicator operates based on the principle of rotating magnetic fields. In a three-phase power system, the magnetic fields generated by the three phases interact with each other to produce a rotating magnetic field. The direction of rotation of this field depends on the order of the phases.

In the RYB phase sequence, the magnetic field rotates clockwise because the Red phase leads the Yellow phase, which leads the Blue phase. This sequential order creates a rotating magnetic field in a clockwise direction.

However, in the BRY phase sequence, the Blue phase leads the Red phase, which leads the Yellow phase. This change in order results in a rotating magnetic field in an anticlockwise direction. Therefore, the phase sequence indicator will rotate in the opposite direction.

3. Answer Explanation:
Based on the above explanation, the correct answer is option 'D' - It will rotate clockwise only. This means that when the phase sequence is changed to BRY, the phase sequence indicator will not rotate anticlockwise, but will continue to rotate in the clockwise direction as it did for the RYB phase sequence.

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