What should we do if the fuse burns out after the underground long-distance ventilation fans is powered on?

Underground long-distance ventilation fans are critical for maintaining airflow in mines and tunnels, ensuring a safe and breathable environment for workers. However, an issue that can arise after connecting the power supply to these fans is the burnout of the fuse or melt. Below are common causes of this problem and the recommended troubleshooting methods.

1. Single-Phase Start

If the fan attempts to start but only one phase of the motor is activated, this can cause the fuse to burn out. To resolve this issue, it is essential to inspect the power line, motor lead wires, fuses, and switch contacts. Any broken wires, faulty connections, or loose contacts should be identified and repaired. A comprehensive inspection of the electrical system will ensure all phases are working correctly, preventing future burnout.

2. Motor or Impeller Stuck

Another common issue is when the motor or impeller becomes stuck, which can overload the motor and burn the fuse. To address this, inspect the fan’s motor and impeller for any mechanical blockages or damage. If the impeller is obstructed or the motor is jammed, troubleshooting should involve cleaning, lubricating, or replacing damaged parts to restore proper functionality.

3. Inappropriate Melt Cross-Section Area

Choosing the wrong fuse size can also cause the fuse to burn out. If the melt cross-section area is too small, it may fail to provide adequate protection against motor overload. To select the correct fuse size, the following formula can be used:
Fuse rated current = Start current / (2-3)
This ensures that the fuse is capable of handling the motor’s starting current while providing protection against overload.

4. Cable Short Circuit

If there is a short circuit in the cable from the power supply to the motor, the fuse may burn out instantly. In this case, it is necessary to inspect the entire length of the cable to identify the short circuit point. Once the fault is located, repair or replace the damaged cable to prevent further electrical issues.

Burnout of the fuse in underground long-distance ventilation fans can be caused by various electrical and mechanical issues. By thoroughly inspecting the power supply, motor components, and electrical connections, and ensuring proper fuse sizing, these problems can be effectively resolved. Regular maintenance and adherence to correct installation practices will help extend the lifespan of the fan and ensure reliable ventilation in mining operations.