Main functions of electrical control system

(1) Automatic control function. The volume of high-voltage and high-current switching devices is very large. Generally, the operating system is used to control the switching and closing. Especially when the equipment fails, the switch needs to automatically cut off the circuit, and there must be an automatic control device. Automatic control of power supply equipment.

(2) Protection function. Electrical equipment and lines will malfunction during operation. The current (or voltage) will exceed the range and limits of equipment and line operation. This requires a set of detection of these fault signals and automatic adjustment of equipment and lines (disconnect, Switch the protection device, etc.).

(3) Monitoring function. Electricity is invisible to the eye. Whether a device is energized or de-energized cannot be distinguished from the outside. This requires setting various audio-visual signals, such as lighting and sound, to perform electrical monitoring on the primary device.

(4) Measurement function. The lighting and audible signals can only qualitatively indicate the working state of the equipment (with or without power). If you want to know the working condition of the electrical equipment quantitatively, you need various measuring instruments to measure various parameters of the line, such as voltage. , current, frequency and power size.

In the operation and monitoring of equipment, traditional operating components, control appliances, instruments and signals are mostly replaced by computer control systems and electronic components, but there are still some applications in small devices and locally controlled circuits. . This is also the basis for the realization of microcomputer automation control.