Abstract: The far-infrared temperature measurement technology is a new non-contact test technology,glue stick it has a measurement accuracy, non-contact, safe and reliable in the relevant industry has been widely used.
A conventional temperature limitations.
Electrical equipment after the pass into the current, the device will change the temperature, glue gun the heat and pass into the current proportional to the square; rotating electrical equipment and machinery and equipment and the cooling medium temperature bearings and sliding friction and rolling friction is closely related to ... ... equipment failure of any type to temperature changes more forms. Temperature changes through the testing equipment, in a timely manner to determine and find whether the device is abnormal and failure, to improve equipment reliability and extend equipment service life, and to avoid equipment damage and personal injury are very important. As we all know, the traditional method of temperature measurement equipment inspection is the use of mercury thermometers and alcohol (kerosene) thermometer, mercury thermometer by electromagnetic interferences, alcohol (kerosene) thermometer in the measurement error of high temperature equipment is very large. Therefore, the new device temperature measurement tool - far infrared thermometer is widely used.
2 Far Infrared Temperature Application of new technologies.
Far-infrared temperature measurement technology from the United States and Europe in recent years and the introduction of new non-contact test technology, the power industry has been widely used. Infrared temperature measurement technology for power plants and substations is mainly used in measuring the temperature of electrical equipment, that measure the electrical equipment and heat through into the current and overload conditions, isolating switch and circuit breaker failure and metal connecting parts of the cable head overheating overheating and failure and so on. However, the bearings of rotating equipment for measuring temperature, sealed containers for leaks, test separator, find the process of the process pipe or other insulation to use less insulation breakdowns. I encountered several cases of work equipment by measuring the temperature of non-flow path, typically found in equipment failure and representative.
3 practical examples.
May 2003, a large turbine factory, grid, after overhaul, turbine condenser vacuum can not regulate long-term adjustment of the data, unit load affected by the oxidation corrosion and heat pipe will affect the life of equipment. Checked several times on duty in the thermal system found no fault lies, read the relevant information when the unit overhaul, repair and replace again all running after each inspection equipment measuring infrared thermometer to measure the unit should be completely normal operation Condenser air valve to open the front door, back, up, down, left, right temperature, the found that the door is not fully open the air condenser, resulting in low vacuum, and dissolved oxygen turbine too long! now fully open the valve, the unit immediately dissolved oxygen down to 8 to 9 mg, in unit rated load ≤ 10 mg, to achieve the normal operation of the unit requirements. Measured by the infrared thermometer to check that the valve opening degree of an important reference.
June 2003, running on duty mobile inspection found that: running SSPB-240000/220 type high-pressure side of the bell by the main transformer and the base of the fastening bolts temperatures up to 325 ℃ (there are four bolts adjacent temperature of 120 ℃), the rest of the temperature of the transformer Bell bolt flange at the same temperature of about 60 ℃, rated at 20 million kilowatts unit load, the load down to 17 million kilowatts, measured the temperature of hot bolts down from the 325 ℃ 260 ℃. Analysis that is the transformer leakage magnetic induction produced in the bell bolt discharge current through the uneven occurrence of local current is too large bolts, loose bolts, bolts and flange bolts poor contact will result in overheating. Re-tighten the bolts and bolt heating more serious short jumper ring (or short flat iron) approach to increase the heat and split bolts will lower the temperature to 60 ℃. Otherwise, the main transformer tank will cause local rapid deterioration of rubber seals and oil spills.
30 million kilowatts in a power plant cooling water and hydrogen hydrogen generator, put into operation only after a major overhaul.
In the long run after a small repair, generator collector ring inner ring (near the generator side) carbon brush wear is very serious, and the number of flights have bulk continuous replacement, examination revealed the same time generating oil collector ring brush serious, the Infrared Thermometer detected collector ring brush contact with the inner surface area temperatures up to 230 ℃ ~ 360 ℃, set by the exciter ring outer side of the normal temperature for 60 ℃ ~ 70 ℃, the unit load dropped to 20 GW later, still no set of signs of ring temperature drop, the initial judgments of non-magnetic reasons. Between the brush and collector ring can not see the spark, but to run smoothly and without excessive vibration phenomenon, also ruled out mechanical vibration aspects of failure, further examination revealed that the outer cover and collector ring has a pipeline rupture between the generators, out of the oil collector ring through the gap into the housing base and the negative effect of inhalation of contaminated inner collector ring, while the outer ring in the side was not affected. After stopping treatment, collecting ring coated with Vaseline or other measures of industrial lubrication, the unit starts to run normal 60 ℃ ~ 70 ℃.
4 infrared temperature measurement technology applications.
Overheating of the metal conductor joints measuring method has been widely mastered. But the measurement of non-thermal method of current-carrying conductor is not attention to local overheating of large generator enclosed bus; large-capacity transformer overheating bell flange bolts; sealed container leaks; test separator; find the process pipe or other insulation process insulation failure and other almost forgotten. Infrared temperature measurement equipment, has been widely applied to various production jobs. Engineering staff to get out of where to pass into the current, where it may heat to check where the thinking cycle. Motor core failure; transformer high-voltage bushing failure, piping plug failure; arrester damp heat failure; capacitor failure of insulation aging and deterioration of cable insulation fault, etc., can be measured by infrared examination. To the spirit of "One Less" principle, the use of all equipment, measuring equipment, infrared inspection, so as to ensure the equipment to eliminate the hidden danger in the bud.