1. The application of far-infrared thermal imager in power plants
In 2000, the Zouxian Power Plant used far-infrared thermal imagers to discover a large number of equipment defects, avoiding many equipment accidents and reducing losses by millions. The role of this instrument in the condition maintenance work is the most obvious and successful since the implementation of condition maintenance. The main types of equipment defects found are: heating of high-voltage equipment joints, eddy current loss of transformer boxes, problems in boiler and steam turbines, valve insulation, heating of high-voltage motor leads, heating of terminal block terminals, heating of circuit boards, heating of cable noses, etc. In addition, the application of thermal imager solves the problems of zero detection of high-voltage insulators, online detection of arresters, and indirect detection of internal contacts of switches. Here are some typical application examples.
1.1 Application of boiler
Since the No. 5 furnace of the third phase was put into operation, the 5B upper bearing had serious ash leakage and heat leakage. In June 2000, before the repair of No. 5 furnace, the far-infrared thermal imager was used to check the air leakage from multiple angles and make detailed records, and found the exact leakage point. After the repair, the temperature of the upper bearing dropped from 80°C to 47°C. °C , which solves the legacy problems that have existed for several years.
1.2 Application of high voltage motor leads
After regularly detecting the temperature of the three-phase cables and the junction box outside the motor junction box by using a far-infrared thermal imager, the overheating accident of the motor joint is reduced to a minimum. For example, the temperature of the cable outside the junction box of the first row of furnace 1 reaches above 130°C. Due to the timely detection and timely power outage for maintenance, a major accident has been avoided.
1.3 Application of electrical connectors of high-voltage equipment
Regularly use far-infrared thermal imager to detect all high-voltage electrical equipment, which can timely find and eliminate equipment hidden dangers, avoid the occurrence of abnormal accidents, and provide a strong basis for the implementation of state-based maintenance of switches.
1.4 Application of terminal block and circuit board
Regularly check the terminal block and circuit board with a far-infrared thermal imager, you can find hidden dangers in time, and avoid tripping accidents and many important electrical damages and equipment trips caused by overheating of the awo terminals of the terminal block.
1.5 Application of Transformers
Using a far-infrared thermal imager, it was found that some of the connecting bolts of the upper and lower fuel tanks of the transformer heated up, and the temperature of individual bolts has reached more than 120°C, which is a serious threat. Defects, the temperature of individual bolts has reached more than 120 ° C, a serious threat to the safe operation of the transformer. The eddy current loss caused by the leakage magnetic flux, the heating defect of the bolt is usually difficult to find.
1.6 Applications in low-voltage electrical equipment
A large number of defects such as overheating of low-voltage electrical equipment connectors, overheating busbar connectors, overheating knife switches, overheating fuses, and overheating grounding wires were found. If the 400 V-ground bolt is found to be severely overheated (130°C), the reason is that the ground flat iron is not properly connected to the ground grid. Such defects are usually difficult to find and can easily cause personal injury.
1.7 Application of cable joints
The cable intermediate joints are numbered, regularly monitored and analyzed with a far-infrared thermal imager, and the hidden dangers of the cable joints are eliminated in the bud, so the overheating accident of the cable intermediate joint has never occurred again.
