The Small Application of Far Infrared Thermometer in Equipment Inspection
1. Limitations of traditional temperature measurement
After the electrical equipment is energized, the temperature of the equipment will change, and its heat generation is directly proportional to the square of the energized current; The temperature changes of bearings in rotating electrical and mechanical equipment are closely related to the cooling medium, sliding friction, and rolling friction... Any type of equipment failure is often manifested in the form of temperature changes. It is of great significance to improve the reliability of equipment operation, extend the service life of equipment, and avoid equipment damage and personal injury by detecting changes in equipment temperature, timely judging and discovering whether the equipment is abnormal or faulty. As is well known, the traditional method of temperature measurement for equipment inspection is to use mercury thermometers and alcohol (kerosene) thermometers. Mercury thermometers are greatly affected by electromagnetic fields, and alcohol (kerosene) thermometers have significant errors when measuring equipment with higher temperatures. Therefore, the new device temperature measurement tool - far-infrared thermometer - has been widely adopted.
2. Current application status of new technologies for far-infrared temperature measurement
Far infrared temperature measurement technology is a new non-contact testing technology introduced from European and American countries in China in recent years, which has been widely adopted 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 situation of electrical equipment due to current input, faults and overheating of isolation switches and circuit breaker breaks and metal connection parts, and cable head overheating faults. However, it is less commonly used for measuring the bearing temperature of rotating equipment, checking for leaks in sealed containers, detecting steam water separators, and identifying insulation faults in process pipelines or other insulation processes. In my work, I encountered several typical and representative equipment malfunctions discovered through measuring the temperature of the non flow part of the equipment.
3. Application fields of far-infrared temperature measurement technology
The method of measuring overheating at metal conductor joints has been widely mastered. However, the method of measuring the overheating of non current carrying conductors has not been given enough attention, and local overheating of enclosed busbars in large generators; The flange bolts of the large capacity transformer bell cover are overheated; Whether the sealed container is leaking; Check the soda water separator; The insulation faults during the process of searching for pipelines or other insulation processes are almost forgotten. Far infrared temperature measurement equipment has been widely used in various production positions. The engineering personnel need to check the thought loop where there is a possibility of heat generation if they want to jump out of the current source. The iron core of the motor is faulty; Fault of transformer high-voltage bushing and blockage of oil pipeline; Lightning arrester malfunction due to moisture and heat generation; Insulation aging faults of capacitors and cable insulation degradation faults can be verified through far-infrared measurement. We must adhere to the principle of "no one can be omitted" and use far-infrared measurement equipment to inspect all equipment, so as to ensure that hidden dangers of the equipment are eliminated in the bud.
