Research on protection technology of electrical equipment based on current limiting switch

Current limiting switchIt is a protective device used in an electrical circuit to protect the circuit and electrical equipment by cutting off the circuit when the current is detected in the circuit and exceeds the rated value. The current limiting switch is usually composed of a current sensor and a control unit. The current sensor is used to detect the current in the circuit, and the control unit controls the on-off state of the switch according to the electrical signal of the current sensor.

The function of the current limiting switch is mainly to protect the circuit and electrical equipment, such as cutting off the circuit in time in the case of overload, short circuit and other faults, to avoid fire, burn and other dangerous situations of electrical equipment or circuits. In addition, the current limiting switch can also avoid problems such as power line overload and power loss, thereby improving the stability and safety of the power system.

There are many kinds of current limiting switches, common thermal protection switches, magnetic protection switches, microcomputer protection switches and so on. Among them, the thermal protection switch is controlled according to the temperature change, and automatically cuts off the circuit when the temperature exceeds a certain value, which is often used for overload protection of electrical equipment; The magnetic protection switch is to control the on-off state of the switch through the magnetic force, which is often used for short-circuit protection of electrical equipment; Microcomputer protection switch uses microprocessor technology to detect and control the current, has the characteristics of high precision, programmable, etc., and is often used in power system protection.

In short, the current limiting switch plays a very important protective role in the circuit and electrical equipment, which can avoid the damage of the circuit overload, short circuit and other faults to the equipment and people, and also plays an important role in promoting the safety and stability of the power system. In addition to the common current limiting switch types mentioned above, there are some other types of current limiting switches, such as:

1. Overspeed protection switch: used for the protection of mechanical equipment, when the equipment speed exceeds the rated value, automatically cut off the power to avoid damage to mechanical equipment and safety accidents.

2. Leakage protection switch: used to detect the leakage in the circuit or electrical equipment, when the leakage current exceeds the set threshold, automatically cut off the power supply to avoid the danger of electric shock and damage to electrical equipment.

3. Pulse protection switch: used for high voltage situations, such as lightning, static electricity and other protection, when the circuit receives too high pulse voltage, automatically cut off the power to prevent damage to the circuit and electrical equipment.

The use of current limiting switches has greatly improved the safety, reliability and life of electrical equipment, and its application in various fields is more and more extensive, and with the continuous development of technology, the type and function of current limiting switches are also constantly improving and innovating.

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