In the industry, the provision of reliable power is very important to the safety of equipment and personnel. It can ensure the smooth operation of various electrical facilities such as motors, transformers, wires, and power cables.

In electrical equipment systems, there are often a large number of switches, contacts, wiring, casing clamps, and other components. Because of various reasons such as poor contact, corrosion, internal abnormality, etc., abnormal hot spots are caused, which endanger the normal operation of the equipment and the safety of the power supply, and can also cause electrical fires.

Infrared thermal imaging is a fast and efficient detection method that can accurately detect hot spots, eliminate hidden dangers in time, ensure power supply safety, and effectively reduce maintenance costs and ensure power supply safety.

According to the different causes of electrical equipment defects, we usually summarize them into the following categories:

(1) The parts exposed to the air for a long time have poor contact due to the influence of temperature, humidity, surface fouling, etc.

(2) Heat generated due to component damage caused by an external force, which reduces the conductive cross-sectional area, such as the poor connection of joints, uncompressed or over-tightened bolts, and washers

(3) Corrosion and oxidation in long-term operation

(4) Corrosion caused by reactive gases and dust in the atmosphere

(5) The material of the components is poor, and the processing and installation process is not good, causing damage to the conductor

(6) The actual cross-section of the conductor is reduced due to various reasons such as mechanical vibration

(7) The load current is unstable or exceeds the standard

(8) The resistance is too large due to the internal failure of the equipment, such as poor contact of the internal connecting parts

Thermal defect detection needs to focus on the following points:

(1) Outgoing connector and internal diversion circuit connection detection

(2) Detection of various conductive joints, wiring joints oxidation corrosion, poor connection defects

(3) Heat detection of the wire clamp

The followings are the detection methods of the infrared camera:

1. The method of surface temperature judgment

This is mainly applicable to the electric current heating type and electromagnetic effect heating type equipment. According to the measured surface temperature value of the equipment, combined with the environmental conditions and the actual current (load) of the equipment at the time of detection, the maximum current (load) that may occur in normal operation.

2. The method of relative temperature difference judgment 

This is mainly applicable to current-heating equipment, especially for current-heating equipment where the current (load) is small during testing and the type of equipment defect cannot be determined. Using the relative temperature difference judgment method can improve the accuracy of judging the type of equipment defects and reduce the missed judgment rate of equipment defects when the operating current (load) is small.

3. The method of image feature judgment

This mainly applies to voltage heating type equipment. According to the thermal image of the normal state and abnormal state of similar equipment, judge whether the equipment is normal or not, and try to eliminate the influence of various interference factors on the image. If necessary, combine the results of the electrical test or chemical analysis to make a comprehensive judgment.

4. The method of comprehensive analysis and judgment

This mainly applies to integrated heating equipment. For integrated heating equipment such as oil-immersed bushings and current transformers, when the defect is caused by two or more factors, a comprehensive analysis and judgment should be made based on the operating current, the heating part, and the nature. For the overheating caused by the magnetic field and magnetic flux leakage, it can be judged according to the criterion of current-heated equipment.

5. The method of real-time analysis and judgment

Let the thermal imaging camera continuously detect/monitor a device under test within a period of time, observe and record the value of the device's temperature changing with factors such as load and time, and perform real-time analysis and judgment. It is mostly used for very heavy load tests or tracking and analysis judgment of defective running equipment.

The application of infrared imaging technology can keep the power system running effectively and efficiently, and it has become the core preventive maintenance tool of the power system of major enterprises, escorting the safe production of modern enterprises. If you want to learn more about infrared thermal imaging cameras after reading the above, you can contact us for professional solutions.

With excellent R&D technology and high-quality products, we have become one of the leading thermal temperature cameras manufacturers. We have rich experience in design and production, and we have also established a complete quality inspection system, which can control the quality of our products in an all-round way. At the same time, we will also provide thoughtful one-stop service and effective solution technology according to the actual needs of customers. If you want to buy our high-quality thermal imaging camera, please contact us immediately!