Connection points are the electrical interfaces between different pieces of equipment, as well as between the equipment and busbars or cables. Overheating at these connection points has long been a common issue in power systems. However, with the rising load on electrical equipment and the increasing demand for reliable power supply, thermal issues at connection points have become a more critical concern in equipment maintenance and defect management. This problem requires careful attention and effective solutions.
Firstly, the heat source in electrical equipment arises from the operation of current and voltage. During normal functioning, three main types of thermal faults can occur: resistance loss, dielectric loss, and iron loss. These losses generate heat, which can lead to temperature rise if not properly managed.
Secondly, thermal failures in electrical equipment can be categorized into external and internal faults. External faults often result from poor contact, such as at exposed joints that are vulnerable to environmental factors like moisture and corrosion. Over time, this can lead to overheating and potential equipment failure.
Thirdly, internal faults occur within the equipment due to issues such as insulation degradation or circuit malfunctions. These faults may be hidden inside solid insulation, oil-filled components, or within the equipment casing. By analyzing the internal structure and operating conditions of the equipment, along with heat transfer principles, it's possible to identify temperature distribution patterns on the surface, which can indicate potential internal faults. Monitoring these thermal profiles is essential for early fault detection and preventing serious failures.
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