p系列机器功耗及供电普及知识（P series machine power consumption and power supply popularization knowledge）.doc

p系列机器功耗及供电普及知识（P series machine power consumption and power supply popularization knowledge） Frequent customer calls to ask about the power consumption of the P series of minicomputers and the preparation of power supplies, The following are some of the more common questions to answer, hoping to promote a better understanding of the preparation of electricity. Problem set: what is a three-phase alternating current? 380V is it 3 phase 4 or 3 phase 5? What is the difference between the voltage of electricity and industrial electricity? What is the protection ground, work place, floor, table? How does ground line connect better? Why do you have to have ground? Why is zero voltage less than 1V? Why cant the ground be short? What are the requirements for the roughness of the wire? Three phase alternating current? By three same frequency, equal potential amplitude, phase difference and difference of 120 ° Angle of power system composed of ac circuits, called three-phase alternating current. Why three phases? The three-phase alternating current can make the motor rotate, and when the three-phase alternating current flows into the three-phase stator winding, a rotating magnetic field is generated in the stator chamber. The stationary rotor is rotated before turning Under the action of the magnetic field, the magnetic force line of the rotor conductor is equivalent to the cutting of the magnetic field, which induces the induction current (electromagnetic induction principle) in the rotor conductor. These are the rotor conductors with inductive currents In a magnetic field, a motion occurs (the effect of the current, the electromagnetic force). The color of four wires of the three-phase power of the IBM P series minicomputer (applicable to P670; P690; P590; P595 server) : -- L1 (phase 1) = black The phase 2 phase is equal to blue Phase 3 (phase 3) = brown -- PE (ground) = green/yellow 380V is it 3 phase 4 or 3 phase 5? According to the above statement, 3 phase lines will be