Question
Download Solution PDFIn a three-phase system, the order in which the voltages attain their maximum positive value is called ________.
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFThe order in which the three-phase voltages attain their positive peak values is known as the phase sequence. Conventionally the three phases are designated as red-R, yellow-Y, and blue-B phases.
The phase sequence is said to be RYB if R attains its peak or maximum value first with respect to the reference as shown in the counter-clockwise direction followed by Y phase 120° later and B phase 240° later than the R phase.
Important Points:
- The phase sequence of the voltages applied to a load is determined by the order in which the 3 phase lines are connected
- The phase sequence can be reversed by interchanging any one pair of lines without causing any change in the supply sequence
- Reversal of sequence results in reversal of the direction of rotation in case of induction motor
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