Function, selection and installation skills of mot

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Function and selection and installation skills of crane motor fuse

fuse is a short-circuit protection element that will be of important economic and social significance in the constant development of green buildings. The short-circuit fault of motor and line will cause a large short-circuit current, which will overheat the transmission line, and the winding will be burnt out when the short-circuit current flows through the motor winding. Therefore, the use of fuses can cut off the main circuit when the motor fails, so that the motor is separated from the power supply. The fuse is composed of two parts: the fuse tube and the melt, which are metal wires or metal sheets, and the electricity price of the fused power plant may be more expensive due to the global energy shortage. The melt is connected in series in the protected circuit. When the current flowing through it exceeds the specified value, the melt will automatically fuse and directly cut off the circuit for protection. Some small problems will inevitably appear in the operation process of the lifting tension testing machine. The lighting, control and main circuit of the machine are equipped with fuses

porcelain plug-in fuses are commonly used for lighting circuits on cranes, and screw fuses are generally used for motor protection

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selection and installation of fuses

(1) melts and fuses should be correctly selected. When there is a branch circuit, the melt rated current of the branch circuit should be smaller than the previous level; Loads of different nature, such as lighting circuit, main circuit and control circuit of motor, shall be protected separately as far as possible, and separate fuses shall be installed

(2) when installing the screw fuse, attention must be paid to connecting the power line to the lower terminal of the porcelain base to ensure safety

(3) when installing the fuse of porcelain plug-in fuse, the fuse should go around along the tightening direction of the screw. At the same time, attention should be paid not to scratch the fuse or tighten the fuse too tightly, so as to avoid reducing the cross-sectional size of the fuse or crushing the fuse

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