Reason analysis and solution of temperature resistance resistance wire in power plant I. Temperature resistance resistance wire of power plant:
1, long-term immersed in the guide bearing, thrust bearing oil tank, so that the wire becomes hard and brittle, the wire is difficult to bend. A lot of cracks appear on the surface of the wire, and when the wire is severe, the core wire inside the wire is also cracked, and the wire core is exposed outside.
2. Wire breakage at the root of the wire is relatively serious. Some break directly and some of the outer insulation is disconnected.
3, the diameter of the wire is too small, including the wire diameter and the diameter of the single wire core wire. Second, the reason analysis:
1. The long-term immersion of wires in the oil appears hard and brittle due to the unreasonable selection of the material of the outermost insulating layer of the wire. For example, the outer sheath material of the wire is a PVC material, and its oil resistance and temperature resistance are relatively poor. At higher temperatures, its oil resistance will be greatly reduced, and its service life will be greatly reduced. After prolonged immersion in oils of higher temperatures, the wires become hard and brittle.
2. The condition of wire breakage at the root of the wire will vary according to the unit and field environment. The possibility of breakage of the thrust is the greatest. The cause of wire breakage is as follows:
1) The wire is subjected to the impact of oil flow for a long time. The unit operates and forms a flowing oil film that constantly acts on the root of the wire. The root of the wire is the part where the rigid (sensor) and the flexible (wire) are connected, and it is precisely a part where the stress is easily concentrated. This can easily lead to the fatigue of the wire material, resulting in a broken wire.
2) Different unit and site use environment. The on-site use environment of the pumped-storage unit and the mixed-flow unit is not the same. The pumped-storage unit frequently switches due to the rotation direction of the large shaft, so the root of the unit's tile temperature-measuring resistance will be affected by two opposing oil flow forces. Impact, so that there is a greater chance of disconnection at the root of the sensor. In another case, the on-off frequency of the pumped-storage unit is much higher than that of other units, which requires a higher reliability of the sensor.
3, the outer diameter of the wire does not meet the site's use of the environment and the specific requirements of the unit, for different capacity units, the oil film thrown up the speed, impact is not the same, according to the specific circumstances of the site to select the appropriate wire diameter, The diameter of the wire is too small to withstand a certain amount of force, which will affect the life of the sensor.
Third, the solution 1, we use oil-resistant, temperature-resistant wire materials. We have chosen FEP, F-46, a copolymer of tetrafluoroethylene and hexafluoropropylene. It is a modified material of PTFE. It has excellent oil resistance, corrosion resistance and heat resistance, and can be used at temperatures from -250 to 250°C for a long period of time. In addition to the high temperature and high pressure of fluorine and molten alkali metal it has a corrosive effect, other such as strong acids (including concentrated nitric acid and aqua regia), strong bases, strong oxidants, oils, ketones, ethers, alcohols and other even at high temperatures It does not work for it. In addition, its crack resistance is also very prominent. It can completely solve the problem of cracking of the wire in the oil for a long time.
2. We did a protective device on the root of the wire.
1) We have made a spring protection device on the back end of the sensor to prevent wire breakage due to impact, vibration, and bending of the oil flow.
2) We extend the root of the sensor with the armour wire, so that the part of the wire that is impacted by the oil flow is all armored wire. Since the armor wire can be arbitrarily bent, the wire becomes a wire with a stainless steel housing. Thoroughly solve the problem of corrosion and impact of oil on the wire. Longer service life and more reliable performance.
1, long-term immersed in the guide bearing, thrust bearing oil tank, so that the wire becomes hard and brittle, the wire is difficult to bend. A lot of cracks appear on the surface of the wire, and when the wire is severe, the core wire inside the wire is also cracked, and the wire core is exposed outside.
2. Wire breakage at the root of the wire is relatively serious. Some break directly and some of the outer insulation is disconnected.
3, the diameter of the wire is too small, including the wire diameter and the diameter of the single wire core wire. Second, the reason analysis:
1. The long-term immersion of wires in the oil appears hard and brittle due to the unreasonable selection of the material of the outermost insulating layer of the wire. For example, the outer sheath material of the wire is a PVC material, and its oil resistance and temperature resistance are relatively poor. At higher temperatures, its oil resistance will be greatly reduced, and its service life will be greatly reduced. After prolonged immersion in oils of higher temperatures, the wires become hard and brittle.
2. The condition of wire breakage at the root of the wire will vary according to the unit and field environment. The possibility of breakage of the thrust is the greatest. The cause of wire breakage is as follows:
1) The wire is subjected to the impact of oil flow for a long time. The unit operates and forms a flowing oil film that constantly acts on the root of the wire. The root of the wire is the part where the rigid (sensor) and the flexible (wire) are connected, and it is precisely a part where the stress is easily concentrated. This can easily lead to the fatigue of the wire material, resulting in a broken wire.
2) Different unit and site use environment. The on-site use environment of the pumped-storage unit and the mixed-flow unit is not the same. The pumped-storage unit frequently switches due to the rotation direction of the large shaft, so the root of the unit's tile temperature-measuring resistance will be affected by two opposing oil flow forces. Impact, so that there is a greater chance of disconnection at the root of the sensor. In another case, the on-off frequency of the pumped-storage unit is much higher than that of other units, which requires a higher reliability of the sensor.
3, the outer diameter of the wire does not meet the site's use of the environment and the specific requirements of the unit, for different capacity units, the oil film thrown up the speed, impact is not the same, according to the specific circumstances of the site to select the appropriate wire diameter, The diameter of the wire is too small to withstand a certain amount of force, which will affect the life of the sensor.
Third, the solution 1, we use oil-resistant, temperature-resistant wire materials. We have chosen FEP, F-46, a copolymer of tetrafluoroethylene and hexafluoropropylene. It is a modified material of PTFE. It has excellent oil resistance, corrosion resistance and heat resistance, and can be used at temperatures from -250 to 250°C for a long period of time. In addition to the high temperature and high pressure of fluorine and molten alkali metal it has a corrosive effect, other such as strong acids (including concentrated nitric acid and aqua regia), strong bases, strong oxidants, oils, ketones, ethers, alcohols and other even at high temperatures It does not work for it. In addition, its crack resistance is also very prominent. It can completely solve the problem of cracking of the wire in the oil for a long time.
2. We did a protective device on the root of the wire.
1) We have made a spring protection device on the back end of the sensor to prevent wire breakage due to impact, vibration, and bending of the oil flow.
2) We extend the root of the sensor with the armour wire, so that the part of the wire that is impacted by the oil flow is all armored wire. Since the armor wire can be arbitrarily bent, the wire becomes a wire with a stainless steel housing. Thoroughly solve the problem of corrosion and impact of oil on the wire. Longer service life and more reliable performance.
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