In order to ensure the reliability and safety of the primary equipment during the operation of electrical control, many auxiliary electrical equipment is required to serve it, and a combination of several electrical components that can realize a certain control function is called a control loop or a secondary loop. These devices shall have the following capabilities:
1. Automatic control function.
The volume of high-voltage and high-current switchgear is very large, and the operating system is generally 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 operating equipment. Automatic control of power supply equipment.
2. Protective function.
Electrical equipment and lines will fail during operation, and the current (or voltage) will exceed the allowable working range and limit of the equipment and lines, which requires a set of detection of these fault signals and automatic adjustment (disconnection, switching) etc.) protective equipment.
3. Monitoring function.
Electricity is invisible to the eyes. It is impossible to tell whether a piece of equipment is powered on or off from the outside. This requires setting up various audio-visual signals, such as lights and sounds, to conduct electrical monitoring of primary equipment.
4. Measurement function.
Light and sound signals can only qualitatively indicate the working status of the equipment (power on or power off). If you want to quantitatively know the working status of electrical equipment, you also need to have various instruments and measuring equipment to measure various parameters of the line, such as voltage. , current, frequency and power, etc.
In the operation and monitoring of electrical control, most of the traditional operating components, control appliances, instruments and signals can be replaced by computer control systems and electronic components, but they still have a certain scope of application in small equipment and locally controlled circuits. This is also the basis for the circuit to realize the automatic control of the computer.
Overcurrent protection is a current-type protection that is different from short-circuit protection. The so-called overcurrent refers to the operating state of the motor or electrical component exceeding its rated current, which is generally smaller than the short-circuit current and no more than 6 times the rated current. In the case of overcurrent, the electrical components are not damaged immediately, 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.
Jiangsu Weineng Electric Co.,Ltd is profession manufacturer of various types of industrial electric heater, everything is customized in our factory, Should you have any questions please feel free to come back to us.
Contact: Lorena
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Post time: May-24-2022