Introduction To Power Fittingswhat Is The Difference Between Phase Sequence And Phase?

Energy power meter What is the difference between phase sequence and phase?
Answer: The writing method of the secondary wire head is as follows.
(1) First, recognize the installation number of the installation unit of each device or the representative symbol of the component.
(2) This wire head should be written with the number of the installation unit at the other end of this wire head or the representative symbol of the component and the terminal number of the component.
(3) Recognize the sequence number of each installation unit or component terminal.
What are the performance indicators of insulating materials?
Answer: The performance indicators of insulating materials are as follows.
(1) Dielectric strength.
(2) Tensile strength.
(3) Specific gravity.
4) Expansion coefficient.
What are circuits, voltages, frequencies, phase voltages, and line voltages?
Answer: The path through which current flows is called a circuit.
The potential difference between two points in a circuit is called voltage, which is represented by the symbol "U".
The number of times the alternating current changes per second is called frequency, which is represented by the symbol "f". In a three-phase AC circuit, the voltage between each phase and the neutral line is called phase voltage. In a three-phase AC circuit, the voltage between phases is called line voltage. Tianjianbadian
Answer: The alternating current used in the power supply is a three-phase symmetrical sinusoidal alternating current. This alternating current is generated by a three-phase alternating current generator. The characteristics are that the maximum values ​​(or effective values) of the three-phase sinusoidal alternating current are equal, and the phase difference is 1/3 cycle, that is, 120°. The so-called phase sequence is the order in which the instantaneous values ​​of each phase of the three-phase alternating current reach the maximum positive value, that is, the order of the phases. When the U phase leads the V phase by 120°; the V phase leads the W phase by 120°; and the W phase leads the U phase by 120°, such a phase sequence is U-V-W, which is called the positive sequence (or the forward phase sequence). If any two phases are swapped, it is called a negative sequence (or a reverse phase sequence). For example, if U and W are swapped, it is W-V-U. U, V, W, these three different names for the phases. They themselves have no specific meaning, but are used to distinguish them when compared with each other. In the generator, the difference between the three-phase busbars is represented by different colors. my country stipulates that yellow is used to represent the U phase, green is used to represent the V phase, and red is used to represent the W phase.