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Addtime：2023-08-18
Source：Yueqing Xujing Fuse Factory
The main function of the fuse is short-circuit protection.
The selection requirements for fuses are:
During the normal operation of electrical equipment, the fuse should not be blown out; In the event of a short circuit, it should be fused immediately; When the current changes normally (such as the motor starting process), the fuse should not be blown out; When the electrical equipment continues to be overloaded, the fusing should be delayed. The rated voltage of the fuse should be greater than or equal to the rated voltage of the circuit.
The selection of fuses mainly includes the selection of fuse type and the determination of melt rated current.
There are many varieties and types of fuses according to different occasions, voltage levels, protection objects and requirements. High-voltage fuses, high-voltage fuses are divided into indoor and outdoor types, which are not repeated here. Low-voltage fuses are commonly included in three categories: plug-in type, tubular type and spiral type. It can be divided into three types: open type, semi-closed type and closed type.
R - fuse; C - plug-in; L - spiral; M-Closed tube type; S-Fast; T-With packing tube type. For example, RC1 and RC1A are plug-in types; RM-No packing tube type; RT0, RL1 and RLS are packed tube type and packing spiral type, respectively. Low-voltage fuses have three melts with different structures, one as overload and short-circuit protection (gG) for electrical circuits; the other as short-circuit protection (aR) for semiconductor devices and their complete devices; It can also be derived as motor short-circuit protection (aM).
The principles of fuse selection are:
A. Select the model of fuse according to the line requirements and installation conditions. Circuits with small capacity choose semi-enclosed type or closed type without packing; The choice of large short-circuit current is packing closed type; Fast fuses are selected for semiconductor component protection.
B. Select the rated current of the fuse according to the load characteristics.
C. The selection of melts at all levels needs to cooperate with each other, the latter stage is smaller than the previous stage, the current on the main gate and each branch line is different, and the choice of fuse is also different.
D. Select the rated voltage of the fuse according to the line voltage.
E. The protection melt current of AC asynchronous motor cannot be selected too small (it is recommended to be 2~2.5 times the rated current of the motor). If the choice is too small, it is easy to appear after the one-phase fuse is fused, causing the motor to run out of phase and burn out, and must be equipped with thermal relays for overload protection. Note: The fuse current includes two aspects, one is the rated current of the seat and shell frame where the fuse is installed, and the other is the rated current of the fuse, and the two should not be confused. This is similar to a circuit breaker.
Addtime：2023-08-18
The melt is blown at the crimping or other parts, and there are generally no serious burn marks. The reasons for this may be: the melt section is too small; The melt has scar defects during installation; The fuse porcelain tray is not fixed; The melt crimping is not tight; The melt runs too long and produces a copper-aluminum oxide film, which increases the contact resistance.
Addtime：2023-08-18
High-voltage fuses are simple protective appliances, which are used to protect electrical equipment from overload and short-circuit currents; According to the installation conditions and uses, choose different types of high-voltage fuses, such as outdoor drop type, indoor type, for some special equipment high-voltage fuses should be selected special series; What we often call fuses is a fuse.
Addtime：2023-08-18
Fuse in low-voltage distribution system is a kind of electrical appliance that plays a role in safety protection, fuse is widely used in power grid protection and electrical equipment protection, when the power grid or electrical equipment short circuit fault or overload, can automatically cut off the circuit, to avoid electrical equipment damage, to prevent the spread of accidents.
Addtime：2023-08-18
During the normal operation of electrical equipment, the fuse should not be blown out; In the event of a short circuit, it should be fused immediately; When the current changes normally (such as the motor starting process), the fuse should not be blown out; When the electrical equipment continues to be overloaded, the fusing should be delayed. The rated voltage of the fuse should be greater than or equal to the rated voltage of the circuit.
Addtime：2023-08-18
The high-voltage drop fuse adopts single-phase operation of an insulated rod and does not allow operation with load. It has been found through practice that when the phase is mistakenly pulled with load, most cases are similar to disconnecting the parallel loop or loop, and the disconnection voltage is low, so strong arcing does not occur. When the second phase is pulled open with load, the break voltage is higher because the break voltage is the line voltage.
Addtime：2023-08-18
"Graphene, carbon nanotubes, aerogels, fullerenes, amorphous alloys, superconducting materials, metamaterials, ionic liquids, 3D printing materials, and metal foam." The New Materials Industry Capital Technology Summit released ten new materials with potential in the future.
Addtime：2023-08-18
Users in the logistics industry can log in to China Industrial Electrical Appliance Network to register as members and publish logistics information. China Industrial Electrical Appliance Network provides better service support for our customers, and hopes that customers in the logistics industry will release true and reliable logistics information based on the principle of honesty and credit. Now when you think of "logistics", you should think of the logistics and transportation problem of Double 11, in fact, logistics is a word imported from Japanese materials.
Addtime：2023-08-18
1. The specifications of the fuse should meet the requirements of the protected lines and equipment; The melt shall not be cut small or used together, and metal wire is strictly prohibited instead of fuse.
2. The melt should have a protective cover. Tubular fuses shall not be used without tubes; Melters with filling materials shall not be modified for use.
Addtime：2023-08-18
In order not to fuse the fuse when the motor starts, the rated current of the selected fuse is 1.5~2.5 times larger than the rated current of the motor, so that even if the motor is overloaded by 50%, the fuse will not blow, but the motor will not burn out in 1 hour. Therefore, the fuse can only be used as short-circuit protection for motors, wires, and switchgear, and cannot play the role of overload protection. Only equipment such as thermal relays can be used as overload protection for motors.
Addtime：2023-08-18
When removing the DC control fuse, it should be positive first, then negative. When installing the DC control fuse, it should be installed first negative and then positive. The purpose of this is to prevent parasitic circuits and avoid malfunction of the protective device. The fuse should be installed and taken quickly, not continuously turned on and off, and there should be a period of time between removal and reinstallation (should not be less than 5 s).
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