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Talking about the reactive power compensation effect and misunderstanding of static phase advancer

2019-09-26

The static phase advancer is a crossover converter composed of a thyristor thyristor by collecting the rotor current signal of the asynchronous motor after the asynchronous motor is in normal operation, and then sending a trigger signal to the thyristor via the CPU of the microprocessor. The power frequency power supply is changed to the same frequency as the motor rotor current, and the additional potential of the current is added to the rotor circuit of the motor to change the phase relationship between the rotor current and the rotor voltage, and then the phase relationship between the stator current and the stator voltage of the motor is changed by the magnetic field. A small power factor angle that increases the power factor of the motor. The stator current is reduced, the copper loss and temperature rise of the motor itself are reduced, and the overload capability of the motor is improved, thereby improving the operation of the motor. Its main function in the asynchronous motor reactive power compensation is to improve the power factor of the motor, and can only be put into operation and no work compensation when the asynchronous motor is started normally, but the asynchronous motor is not in the starting process. For any compensation, this must be clear. There are two main reasons for improving the power factor.

The static phase advancer has obvious effects in reducing the stator current of the asynchronous motor and improving the power factor of the motor in the reactive power compensation of the asynchronous motor. However, there is also a certain understanding of the carbon zone, especially in the energy saving and power saving. Viewpoint 2·1 view a large amount of energy saving

The literature 卩] adhere to this point of view, the relevant extracts are as follows

“The introduction of the phaser has a significant impact on the winding temperature, motor current and power factor. The introduction of the phaser can save a lot of energy:

(1) The application of the static phase advancer applies to the current of the No. 2 wire grinding machine (3550(W) and the theoretical energy saving calculation. When the phaser is not used, the current of the grinding machine is 380A, and the current of the main machine is reduced after the phaser is put into operation. For 310A, it runs at 24 hours per month, 24 hours a day, and the operating efficiency is 0.8. In theory, the main power I saves electricity: 30d×24h×6000V×戽(380-310)A×L732/10() ()×().8=424134.144kW·h; the electricity price is calculated at 0.5 yuan/(kW•h), and the monthly electricity saving can reach more than 210,000 yuan. Actual production data when the phaser is put in and out in 2007 See Table L for comparison. Obviously, after input into the phaser, the power factor is increased and the power consumption per unit product is reduced.


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