Three-phase alternating current is a form of transportation of electrical energy, referred to as three-phase electricity. A three-phase AC power source is a power source composed of three alternating current potentials with the same frequency, equal amplitude, and a phase difference of 120° in succession. When the coil rotates in a magnetic field, the wire cuts the magnetic force line to generate an induced electromotive force, and its variation rule can be represented by a sine curve. If we take three coils and place them at a 120-degree angle from each other in space, the three coils still rotate at the same speed in the magnetic field, and three induced electromotive forces of the same frequency are induced in the coil. Since the three coils are 120 degrees apart from each other in spatial position, the generated current is also a three-phase sinusoidal change, which is called three-phase sinusoidal alternating current. The use of three-phase alternating current is many, and most of the alternating current electrical equipment in the industry, such as motors, use three-phase alternating current, which is often referred to as three-phase four-wire system. In daily life, more use of single-phase power, also known as lighting electricity. When powered by lighting electricity, one of the three-phase electricity is used to supply electricity to a relatively powered device, such as a household appliance, and the other line is the fourth of the three-phase four-wires, that is, the neutral line therein. The neutral line leads from the three-phase neutral point. The wire cuts the magnetic induction wire to generate current, so three stator coils with the same spacing of 120 degrees are placed in the stator magnet of the generator. They are called A-phase coil, B-phase coil and C-phase coil. When the magnetic rotor rotates, A, B, C each phase will produce a current, which will be three-phase electricity, as shown in Figure 1 below. Since the length of the cut wire is the same and it rotates in the same pair of magnetic poles, and the speed of rotation is the same, the electromotive force induced by the three coils is also equal in magnitude. Because of the same rotation speed, the three coils generate current at the same frequency. However, the phase angles of the three coils differ by 120 degrees, resulting in a phase difference of 120 degrees in the current. So we can also think of as the merger of three single-phase alternating currents with the same frequency but 120 degrees apart from each other. Figure 1 Three-phase power generation 1, pointer multimeter 2, there are three lines of AC contactor 1. We know that home 220V AC is very dangerous, as long as it is not dangerous to touch the thread directly. The same 380V industrial electricity direct contact is also very dangerous. Its 50Hz frequency and 380V high voltage are more harmful to the human body. So you must know its characteristics and use points. The important point is not to touch any thread and metal parts with bare hands at any time. Because the three wires of the 380V power supply are all live wires, touching any one of them can pose a dangerous voltage of 220V with the earth. So pay special attention to safe electricity. First of all, make sure that the multimeter pen is in good contact and turn the multimeter's range switch to the AC position. 2. First of all, make sure that the meter pen is in good contact and turn the multimeter's range switch to the AC position. According to the principle of using the multimeter from the high-end to the low-grade principle, the measured power supply 1KV is estimated to be no, select the 500V file. 3, for the safety of operation, people can stand on a dry wood or wooden bench. In this way, the human body and the earth are insulated. If you are on a wooden floor, it is not dangerous to touch a fire wire. But at this time, you are an extension of this wire and cannot contact with anything else, the wire, or the earth. If contact forms a circuit, it is dangerous. Now place the multimeter close to the power supply, the contactor. The two pens of the multimeter touch the two metal parts of the contactor, regardless of the red and black table pens, or U, V, W. Two lines are fine. 4. At this time, the pointer can be seen to be deflected to the right from the panel of the multimeter, and it will not move in one position. This value is the voltage between these two lines. The reading is like this. The V mark on the left side of the second arc on the front panel of the multimeter shows the voltage. The voltage is divided into AC and DC, namely the wave line and the straight line. We measured AC power. The value is on this arc. Since we are using 500 gears, the scale is 10, 50, 250, which is calculated by 5 times. Our 500 is more than 50 times more than 50, just can see 50 this tick, just at the 38 value, so it is 10 times more is 380V. The same is true for other gears. You can read and read the values. 5, followed by a table pen invariant position, another pen to the third line. It can also be UV, UW, VW. 6. The result of the measurement is 380V. This three-phase power is characterized by a phase voltage of 380 between each two lines and a line voltage of 380V. This is the three-phase three-wire power supply mode. There is also a three-phase four-wire system, which has a neutral line. Their relationship is that the phase voltage is still 380V and the neutral line is 220V. 7. In this way, you learn how to read the value on the multimeter, and you also know some characteristics of the three-phase power.
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How to use a multimeter to measure three-phase electricity?
Three-phase principle