(1) Automatic control function. The volume of high-voltage and high-current switchgear is very large. Generally, the operating system is used to control the opening and closing, especially when the device fails, the switch needs to automatically cut off the circuit, and there must be a set of automatically controlled electrical operation equipment. Automatic control of power supply equipment.

(2) Protection function. Electrical equipment and lines will fail during operation, and the current (or voltage) will exceed the allowable working range and limits of the equipment and lines. This requires a set of detection of these fault signals and automatic adjustment of the equipment and lines (disconnect, switch) Etc.) protection equipment.

(3) Monitoring function. Electricity is invisible to the eyes. Whether a device is powered or powered off is indistinguishable from the outside. This requires setting up various audio-visual signals, such as lights and sounds, and electrical monitoring of the primary device.

(4) Measurement function. Light and sound signals can only qualitatively indicate the working status of the equipment (powered or power-off). If you want to know the working status of electrical equipment quantitatively, you also need various instrument measuring equipment to measure various parameters of the circuit, such as voltage , Current, frequency and power etc.

Overcurrent protection is a current type protection that is different from short circuit protection. The so-called overcurrent refers to the operating state of a motor or electrical component exceeding its rated current, which is generally smaller than the short-circuit current and does not exceed 6 times the rated current. In the case of overcurrent, electrical components are not immediately damaged, as long as the current value can return to normal before the maximum allowable temperature rise of the glue is reached, it is still allowed.