Connection points refer to the electrical connections between different pieces of electrical equipment, as well as between the equipment and busbars or cables. Overheating at these connection points has long been a known issue in power systems. However, with the increasing load on electrical equipment, the demand for reliable power supply has become a more pressing concern in equipment defect management. This problem deserves careful attention and proper solutions.
The causes of overheating can be categorized into several main factors:
1. **Heat Sources in Electrical Equipment**: When electrical devices are in operation, heat is generated due to the effects of current and voltage. There are three primary types of thermal faults: resistance loss, dielectric loss, and iron loss. These losses contribute to temperature rise within the equipment.
2. **Thermal Faults in Electrical Equipment**: Thermal faults can be further divided into external and internal issues. An external fault often results from poor contact, such as at exposed joints that are left unprotected over time. These weak points can lead to overheating and potential failure.
3. **Internal Faults in Electrical Equipment**: Internal faults occur due to failures in the electrical circuit or degradation of insulating materials inside the equipment. These may be found in solid insulation, oil insulation, or gas-filled compartments. By analyzing the internal structure and operating conditions of various electrical devices, and applying heat transfer theory, it's possible to determine how heat is conducted and convected through conductive metals, insulating oils, and gases. This helps identify abnormal temperature distributions on the surface of the equipment, which can indicate an internal fault.
Understanding and addressing these issues is essential for maintaining the safety and reliability of power systems. Regular monitoring and maintenance can help prevent overheating and reduce the risk of equipment failure.
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