In the power industry, thermal imaging cameras have long been used for the safety maintenance of equipment, through which thermal defects of electrical equipment and lines are detected, such as transformers, bushings, circuit breakers, knife gates, transformers, power capacitors, Lightning arresters, power cables, busbars, wires, combined electrical appliances, insulator strings, low-voltage electrical appliances, and secondary circuits of equipment with current or voltage-induced thermal effects or other thermal effects. To a very critical and effective role.
The so-called thermal defect of electrical equipment usually refers to the heat phenomenon caused by its internal or external reasons, which is detected by certain means.
Causes of three kinds of defects 1. Components exposed to the air for a long time, due to the influence of temperature and humidity, or poor contact caused by surface fouling, or damage to components caused by external forces, resulting in a reduction in the conductive cross-sectional area. Generated fever. Such as poor connection of the joints, bolts, and hot rings are not compressed; long-term corrosion and oxidation; corrosion caused by active gases and dust in the atmosphere; poor quality of the gas parts, poor processing and installation techniques, conductor damage; mechanical vibration, etc. The actual cross section of the conductor is reduced; the load current is unstable or exceeds the standard.
2. The internal fault of the electrical appliance, such as excessive resistance caused by poor connection of internal connection parts; aging, cracking, and shedding of insulating materials; dampness of internal components, increased loss of components; blockage of cooling medium pipes, etc.
3. The eddy current loss caused by the leakage magnetic flux is often very difficult to detect. You will be able to see the micro temperature difference of the cell through the thermal imager.
For those who can directly observe the equipment and vital parts, the OI61-844 infrared thermal imager can find the thermal hazards of all connection points. Those parts that cannot be seen directly because of being blocked can be analyzed according to the heat transfer to the external components, and a conclusion can be drawn.
Since the actual situation on the scene is ever-changing, even if you get a hot picture through a thermal imager, if you want to make an accurate judgment, it may be affected by many factors. Such as the current temperature, air volume, load and other conditions. We can make corresponding judgments based on different characteristics and analysis of the role as follows:
Level 1:
★ Whether the temperature difference between the phases is greater than 24 ℃
★ Is the absolute temperature 94 ℃, or greater than the reliable measurement being used?
★ Is there a visible signal indicating that the metal or moisturizing layer has melted or discolored severely?
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