Phase sequence意思

"Phase sequence" is a term used in electrical engineering to describe the order in which the three phases of a three-phase system reach their peak voltages. In a three-phase system, the three phases are typically labeled A, B, and C, and they are said to be in a "normal" or "standard" phase sequence when they reach their peak voltages in the order of A-B-C. This means that phase A reaches its peak first, followed by phase B, and then phase C.

The phase sequence is important in the operation of three-phase electrical equipment, such as motors and generators, because it determines the direction of rotation of the equipment. If the phase sequence is reversed (i.e., if the order is A-C-B instead of A-B-C), the direction of rotation of the equipment will also be reversed.

The phase sequence can be determined by measuring the voltage or current at each phase, or by using a device called a phase sequence indicator. It is important to ensure that the phase sequence is correct before starting up three-phase equipment to avoid damage to the equipment or injury to personnel.