• Features of programmable controller

    Features of programmable controller

    The programmable controller is developed from the relay control system. Due to the application of microprocessor and electronic technology, PLC has the following characteristics:   1.High reliability PLC adopts many anti-interference measures, such as electromagnetic shielding of CPU module, settin... read more

    18-11-2020 News
  • Zero and under voltage protection

    Zero and under voltage protection

    When the motor is working normally, if the motor stops due to the disappearance of the power supply voltage, the motor may start automatically when the power supply voltage is restored. The self-starting of the motor may cause personal or equipment accidents. For the power grid, the self-starting o... read more

    18-11-2020 News
  • Line protection link

    Line protection link

    1. Short-circuit protection When a short circuit occurs, the main circuit is cut off by the fuse of the fuse FU. In order to expand the protection range, the fuse is as close to the power supply as possible in the line, and is generally installed directly under the knife switch.   2. Overload prote... read more

    18-11-2020 News
  • Design principles of PLC control system

    Design principles of PLC control system

    The essential difference between a programmable controller and a traditional relay control system is the use of the scanning mode and the concept of a relay. PLC system design includes two parts: hardware design and software design. The design method of parallel development of hardware and software... read more

    18-11-2020 News
  • The role of the contactor

    The role of the contactor

    The contactor is an automatic electromagnetic type electric appliance, which is suitable for frequently connecting and disconnecting AC and DC main circuits and large-capacity control circuits over long distances. It is mainly used in automatic control of AC and DC motors, electric heating equipmen... read more

    18-11-2020 News
  • Speed control circuit of multi-speed machine

    Speed control circuit of multi-speed machine

    The synchronous speed of the motor n = 60 f / P. When the grid frequency f is fixed, n is inversely proportional to the number of pole pairs P. If the number of pole pairs P can be changed, then n will also change. Pole-changing speed regulation is only applicable to cage asynchronous motors. Multi... read more

    18-11-2020 News
  • Introduction to contact systems

    Introduction to contact systems

    The contact system is the actuator of an electrical appliance, and it functions to open and close the circuit. Therefore, the quality of the contacts directly affects the working performance of the entire appliance. There are many types of contact mechanisms, and according to their contact types, t... read more

    18-11-2020 News
  • Basic Technology of Power System Dispatching Automation

    Basic Technology of Power System Dispatching Automation

    Power system dispatching automation collects real-time information on the operation of the power system through the remote terminal (RTU) installed in each power plant and substation, and transmits it to the dispatching master station (MS) via the communication channel. Perform safety analysis, loa... read more

    18-11-2020 News
  • About the outline classification of the relay

    About the outline classification of the relay

    According to the size of the relay: 1) Miniature relays: relays with the longest side dimension not greater than 10 mm. 2) Ultra-compact miniature relays: relays with the longest side dimension greater than 10 mm, but not greater than 25 mm. 3) Miniature relays: relays with the longest side dimensi... read more

    18-11-2020 News