Small application of the far infrared thermometer in the inspection of equipment
1. Limitations of traditional temperature measurement
After the current is passed through the electrical equipment, the temperature of the equipment will change, and the heat generated is proportional to the square of the current; the temperature change of the bearings of rotating electrical equipment and mechanical equipment is closely related to the cooling medium, sliding friction and rolling friction... Equipment Any type of malfunction usually manifests itself in the form of temperature changes. By detecting changes in the temperature of the equipment, it is of great significance to promptly determine and detect whether abnormalities and failures occur in the equipment, which is of great significance to improving the reliability of equipment operation and extending the service life of the equipment, as well as avoiding equipment damage and personal injury. As we all know, the traditional method of temperature measurement for equipment inspections is to use mercury thermometers and alcohol (kerosene) thermometers. Mercury thermometers are greatly affected by electromagnetic fields, and alcohol (kerosene) thermometers have very large errors when measuring equipment with higher temperatures. Therefore, a new equipment temperature measurement tool, the far-infrared thermometer, has been widely used.
2. Application status of new far-infrared temperature measurement technology
Far-infrared temperature measurement technology is a new non-contact testing technology introduced in my country from European and American countries in recent years, and has been widely used in the power industry. Far-infrared temperature measurement technology is mainly used in power plants and substations to measure the temperature of electrical equipment, that is, to measure the heating and overload conditions caused by the current flowing through the electrical equipment, the fault overheating of the disconnection and metal connection parts of the isolating switch and circuit breaker, and the overheating fault of the cable head. etc. However, it is rarely used for measuring the bearing temperature of rotating equipment, whether sealed containers are leaking, detecting steam-water separators, and finding insulation faults in process pipelines or other insulation processes. In my work, the author encountered several cases of measuring the temperature of the non-flow part of the equipment, and the equipment faults discovered were relatively typical and representative.
3. Application fields of far-infrared temperature measurement technology
,The method of measuring overheating at metal conductor ,joints has been generally mastered. However, the method of measuring overheating of non-current-carrying conductors has not been taken seriously. Local overheating of closed busbars of large generators; overheating of bell flange bolts of large-capacity transformers; leakage of sealed containers; detection of steam-water separators; search for process pipelines or other insulation processes Thermal insulation failures etc. are almost forgotten. Far-infrared temperature measurement equipment has been widely used in various production positions. Engineers want to jump out of where the current is passed and heat may occur, and check the strange thinking circle there. Iron core failure of the motor; high-voltage bushing failure of the transformer, blockage of the oil pipeline; moisture and heat failure of the arrester; insulation aging failure of the capacitor and cable insulation deterioration failure, etc., can all be verified through far-infrared measurement. It is necessary to use far-infrared measuring equipment to check all equipment based on the principle of "no one is missing", so as to ensure that hidden dangers of the equipment are eliminated in the bud.
