High voltage current limiting fuse refers to an electrical device that uses the heat generated by itself to fuse the melt and disconnect the circuit when the current exceeds the specified value. A fuse is a device that uses the heat generated by itself to melt the molten metal after the current exceeds the specified value for a period of time, thereby causing the circuit to disconnect; A current protector made using this principle. Fuses are widely used in high and low voltage distribution systems, control systems, and electrical equipment. As short circuit and overcurrent protectors, they are one of the most commonly used protective devices.
An electrical device that uses a metal conductor as a molten material in series in a circuit. When an overload or short circuit current passes through the molten material, it melts due to its own heating, thereby breaking the circuit. Fuses have a simple structure and are convenient to use. They are widely used as protective devices in power systems, various electrical equipment, and household appliances.
Main uses
High voltage and large capacity current limiting fuses have made significant progress, especially full range fuses that can serve as complete protection for medium voltage equipment in the future.
1. Protection transformer
The most commonly used situation for high-voltage current limiting fuses is that the fuse manufacturer specifies the rated current of the fuse and the capacity of the transformer.
2. Protect wires and cables
High voltage current limiting fuses serve as short-circuit protection for wires and cables. At this time, the rated current of the fuse must match the continuous carrying capacity of the cross-sectional area of the cable used.
3. Protect the motor
High voltage current limiting fuses can also be used to protect motors, and the lower limit of protection depends on the starting current of each motor. In addition, when selecting a fuse, the duration and frequency of starting are also closely related to avoid fuse disconnection caused by heating.
4 Protective capacitors
When protecting capacitors in compensation equipment, consideration should be given to short-circuit transient currents during operation. The magnitude of the surge current is related to many factors, such as capacitor capacity, the natural frequency and inductance of the power grid, and the input time.
5 Protection transformers
Voltage transformer protection fuses are mainly used as isolation devices to isolate faulty voltage transformers from the power system.
