Thermocouple what is the use of the advantages and disadvantages in hydropower industry _ instrument

Thermocouple is widely applied in people's lives, with the development of technology, thermocouple more application in daily life, and the role of in the hydropower industry is very big. Thermocouple in the hydropower industry advantage: with the development of the industry, the thermocouple has been widely applied in industrial production of measurement, and the temperature measuring thermocouple is a very important sensor, power plant can say role is crucial, because hydropower station temperature resistance performance directly affects the safe operation of the generator can. The disadvantages of thermocouple in the hydropower industry: in hydropower industry, the temperature resistance performance instability and poor reliability is a very common problem. Temperature signal false positives due to performance is not stable, has been plagued by power plant operators and maintenance personnel, serious when can cause the unit shutdown, the unit for life and the safety of the power grid will be inestimable impact. Therefore, this paper analyzes the reasons of temperature resistance failure, improve the long-term stability and reliability of the measuring temperature resistance is a very urgent task. Thermocouple what are the disadvantages in hydropower industry affected by sparks or electric arc should do in the hydropower industry, temperature measuring thermocouple performance instability and poor reliability is a very common problem. Temperature signal false positives due to performance is not stable, has been plagued by power plant operators and maintenance personnel, serious when can cause the unit shutdown, the unit for life and the safety of the power grid will be inestimable impact. Therefore, this paper analyzes the reasons of temperature resistance failure, improve the long-term stability and reliability of the measuring temperature resistance is a very urgent task. Because thermocouple electron density of different produce certain electronic diffusion, when they reach a certain potential, which is formed by the balance after the contact potential depends on the size of the two different conductor material properties and their temperature contact point. The current applications of the thermocouple have a standard specification. But it takes a special electrical signal of thermocouple wires to pass, this kind of wire we called compensation conductor. Different thermocouples require different compensation conductor, its main function is connected to the thermocouple, away from the power of the reference junction of the thermocouple. Thermocouple the shell of the internal explosive mixed gas by sparks or electric arc resistance such as shadow to the circuit repair are bound to change the length of the wire resistance and impact resistance, resistance to replace the new body is good, if repair welding, after welding and calibrated before use. Measured the change in temperature is directly measured by thermocouple resistance change, therefore, the wires of a thermocouple body such as a variety of wire resistance change will affect temperature measurement. This way, which is equipped with a bridge, which can be better to eliminate the influence of the lead resistance, is commonly used in industrial process control. When the thermocouple for sparks or electric arc affected explosion limits within the junction box, that wouldn't make production field explosion, close to the face in the thermometer. Compared with general axial thermocouple, it can reflect more correctly and quickly measured end face of the actual temperature, suitable for measuring the bearing shell and other pieces of the end face of the temperature.