Some Causes of Overheating in Electrical Equipment
The primary functions of electrical equipment are to transmit, distribute, and convert electrical energy, all of which are accomplished through the flow of electric current. Many faults and accidents in electrical equipment are caused by overheating; early detection and elimination of such overheating can significantly reduce failures and incidents in power systems and enhance the reliability of power supply.
1. Overload
Overload refers to a situation in which the current flowing through an electrical device or conductor exceeds its rated value. When overload occurs, the current increases; over time, this can lead to overheating of the electrical equipment.
2. Short circuit
Short circuit is the most severe fault condition for electrical equipment; in fact, the majority of fires in power grids are caused by short circuits. When a short circuit occurs, the current in the circuit increases to several times or even dozens of times its normal value, leading to a rapid rise in temperature. If this temperature reaches the ignition point of surrounding combustible materials, a fire can be ignited.
3. Poor Contact and Poor Heat Dissipation
Poor contact primarily occurs at conductor connections; for example, loose fixed joints, poor soldering, or contamination on the joint surfaces can all increase insulation resistance, leading to overheating of the connection. Detachable electrical connections, subjected to vibration or thermal expansion, may become loose, also resulting in overheating. All types of electrical equipment are designed and installed with adequate ventilation and heat-dissipation systems; if these systems fail, they can likewise cause overheating of wiring and equipment.
4. Leakage current
When the insulation of electrical wiring or equipment is damaged, leakage current may occur under certain conditions. Such leakage current is typically small and insufficient to trip the circuit fuse, making it difficult to detect. If the leakage current is relatively evenly distributed, the risk of fire is low; however, if the leakage current becomes concentrated at a single point, it can cause significant localized heating, potentially leading to a fire.
Previous page:
Want to learn more about the product? Leave a message now to get more information.
Guogui Electric provides high-quality turnkey solutions and complete product sets to numerous customers.
Contact Us
Address: No.17 Yingkai Road, Jiangnan District, Nanning, Guangxi, China
WeChat QR code