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  • The harmonic interference phenomenon of the inverter includes: after the inverter starts or runs, the motor overheats, whistles (including increased noise, etc.), and vibrates/vibrates. The motor often breaks down, it is found that the stator insulation of the motor is breakdown after disassembling the motor. The connecting wire between the motor and the inverter will overheat, burst, and even catch fire.
    2022-07-11
  • A frequency converter is a power control device that converts a power frequency power supply into another frequency by using the on-off function of a power semiconductor device. First, the power frequency AC power is converted into DC power through the rectifier, and then the DC power is converted into AC power with controllable frequency and voltage to supply the motor.
    2022-07-06
  • The variable frequency drives is a power control device that converts the power frequency power supply into another frequency by using the on-off function of the power semiconductor device. The correct selection of the frequency converter is very critical to the normal operation of the control system. Usually we need to consider the matching problem with the motor, load type, site environment and so on when we select the inverter.
    2022-06-29
  • CMV-S​ series universal soft start control device is mainly suitable for the control and protection of the start and stop of squirrel-cage asynchronous and synchronous motors. The valve group is installed in the withdrawable KYN28 central high-pressure cabinet, and the thyristor valve body adopts the trolley installation method, which is convenient for users to check, test and maintain.
    2022-06-24
  • With communication cable connection, a multi-level drive control system can be easily formed, so as to realize the requirements of master/slave and synchronous control. Connecting with the current popular field bus system will greatly increase the data conversion rate. The extension of the distance between the central control room and the inverter cabinet is beneficial to shorten the distance between the inverter and the motor, so as to improve the system performance with a more reasonable layout.
    2022-06-21
  • Static Var Generator, abbreviated as SVG. Also known as high-voltage dynamic reactive power compensation generator, or static synchronous compensator. It refers to a device for dynamic reactive power compensation by a power semiconductor bridge converter with free commutation. SVG is currently the best solution in the field of reactive power control. Reactive power compensation devices should be equipped in places where low-voltage transformers are installed and next to large electrical equipment.
    2022-06-17
  • We usually refer to the device that converts alternating current with constant voltage and frequency into alternating current with variable voltage or frequency as "frequency inverter". A frequency inverter can also be defined as follows: VFD (Variable-frequency Drive) is a power control device that uses frequency conversion technology and microelectronics technology to control the AC motor by changing the frequency of the motor's working power supply.
    2022-06-14
  • The fundamental cause of harmonic generation in low-voltage power supply systems is due to the nonlinear characteristics of certain equipment and loads in the power grid (such as high-power rectifier equipment, thyristor rectifier equipment, frequency converters, electronic ballasts, and computers). Because these electronic rectifiers have commutation problems, and their loads are non-linear loads. That is, the waveform distortion caused by the non-linear (proportional) relationship between the applied voltage and the generated current.
    2022-06-04
  • The soft starter is essentially a voltage regulator, which can protect the motor from overcurrent damage. Both the soft starter and the variable frequency drive are the control equipment of the AC motor, and the VFD is basically a soft starter with speed control. In practical applications, if you want to change the motor speed, you should use a frequency converter. If you only want to limit the starting current, you can choose a soft starter.
    2022-06-02
  • This article mainly introduces the voltage levels commonly used in transmission and distribution systems. Various power devices in the power system have their own rated voltages, which constitute the voltage level of the entire power system. The voltage used for transmission is higher than the distribution voltage. The division of transmission and distribution voltage boundaries is not fixed and varies with the area covered by the grid and the size of its capacity.
    2022-05-31
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