Why are fuses employed in the low voltage side of a large power system?

The reason for using fuses on the low-voltage side of large power systems

Protect Circuit Safety

The main function of a fuse in a circuit is to protect the safety of the circuit. When there is a fault or abnormality in the circuit, such as overloading or short circuit, the current will increase sharply. In this case, the fuse will automatically fuse and cut off the current, thus preventing damage to the devices in the circuit and avoiding the occurrence of safety accidents such as fire.

Overload Protection

Fuses can provide overload protection. When the operating current of an electrical appliance in a circuit exceeds its rated current, the fuse will melt, cutting off the circuit and causing the appliance to stop working, so as to avoid damage to the electrical equipment due to excessive current.

Short-circuit protection

Fuses can also provide short-circuit protection. When a short circuit fault occurs in the circuit, the current in the circuit will suddenly increase, and the fuse will melt in a short time, preventing large currents from continuously flowing through the circuit, thus playing a role in protecting electrical equipment and personal safety.

Isolation Protection

Fuses can also be used as electrical appliance disconnect switches. When it is necessary to repair or replace an appliance, the circuit can be cut off by pulling out the fuse, ensuring safe operation.

Fault Diagnosis

A blown fuse can indicate a fault with electrical equipment, allowing for quick diagnosis and repair.

In summary, the use of fuses on the low-voltage side of large power systems is to ensure the safe operation of circuits, prevent damage caused by overloading and short circuits, and facilitate maintenance and fault diagnosis.