Problem
At present, most of the domestically produced organic composite insulator end connection structures are wedge-connected, and some manufacturers adopt a foreign-style crimp connection structure. However, both the wedge type and the crimp type have problems in the sealing process of the joint between the end fitting and the core rod. Most domestic manufacturers use the sealant produced by Shanghai Special Rubber Factory. There are some hidden dangers in the process of manually applying sealant.
1) First, it is inevitable that the composite insulator slips between the mandrel and the metal fitting during long-term load operation (wedge type). When the sealant and the metal fitting have poor adhesion, the slight slip is enough to make the seal open. When the sealant is not elastic enough, the excessive slip can break the sealant.
2) Secondly, the domestic production of sealant is mostly room temperature silicone rubber, its anti-aging performance is not as good as high temperature vulcanized silicone rubber, in the case of corona in the end of the gold fittings, may lead to premature aging. For products of 110kV and below, the use of pressure equalizing rings, or the installation of pressure equalizing rings of 220kV and above will be even more dangerous.
3) Since the process of applying the sealant is manual application, there are some uncertain factors, the operation process is not easy to control, and it is not convenient to manage and control the product quality.
Solution
The gold fittings and the mandrel are directly molded together with high temperature vulcanized silicone rubber at the end of the composite insulator (see Figure 1). The new process has simple structure, easy production, safe and reliable use, avoids the quality defects existing in the above analysis, and improves the anti-aging performance. Because it is molded by high-temperature vulcanized silicone rubber, it also reduces the sealing process, reduces the interface, saves the sealant, improves the sealing performance, and solves the brittle fracture of the mandrel due to the poor sealing. problem. What is more gratifying is that after adopting this structure, under the same conditions, the dry arc distance and creepage distance are effectively increased, and the lightning surge voltage level is improved, which can be increased by more than 15% according to laboratory test results. In the multi-ray activity area and the vast mountainous area, this structure can improve the flashover voltage of the lightning strike and ensure the safe operation of the power grid.
The traditional composite insulator is sealed by manual sealing. The rubber compound used is room temperature vulcanized rubber. The anti-aging property is low. Especially in the harsh environment, the corrosion will make the sealant age faster, and the sealing process is difficult to control. The core rod is eroded to cause an accident; and the new sealing process can improve the safety factor of the composite insulator in the operation of the power grid, prevent accidents caused by poor sealing, and be more reliable in product quality!
The so-called mini projector is also called pico projector, TRT-Lcos Portable Projector. Mainly through the 3M LCOS RGB three-color projector and 720P film decoding technology, the traditional huge projector is refined, portable, miniaturized, entertaining and practical, making the projection technology closer to life and entertainment.
Usually the projector has certain regulations on 2 aspects:
a). Size: Usually the size is the size of a mobile phone.
b). Battery life: It is required to have at least 1-2 hours or more of battery life when it is not connected to power.
In addition, its general weight will not exceed 0.2Kg, and some do not even need fan cooling or ultra-small silent fan cooling. It can be carried with you (it can be put into your pocket), and the screen can be projected to 40-50 inches or more.
Advantage:
1. Completely replace the MP5 player, video, listening to songs, playing games, e-books, picture browsing, etc. MP5 video is affected by physical performance, the screen can not be bigger, and the screen of this thing is at least 20 inches.
2. Instead of the TV function, the machine can have a built-in CMMB function, or it can be directly connected to the set-top box to play the TV, and it can be used as a 21-inch TV during the day.
Look, it can be used as a 60-100-inch TV at night to achieve the effect of home theater; it is convenient to move and break through the traditional film and television space. Even if you are on the mountain, you can also share today's TV series, movies, and MTV with your lover.
3. Business office: instead of large projectors, it is used for company meetings; the price of large projectors is 4,000 to 14,000, and the lamp life is more than 1,000 hours, which is not convenient to carry. 30,000 hours, no need to change the bulb for 3 years, easy to carry, the salesman only needs to bring a micro projector to demonstrate the new product, which can achieve the demonstration effect.
4. Teaching: training meetings, classroom teaching; traditional projectors are not easy to carry. In school classrooms, due to the naughty students, projectors are not safe to place in the classroom and are easily damaged by students. The portability of micro projectors makes up for the teaching vacancies. In the future, teachers only need to store the materials in the projector and show them to students for teaching, saving the trouble of textbooks and handwriting with pens and chalks.
In addition, the micro-projection has no radiation, which can fully protect pregnant women and people with myopia. Its low power consumption function is 1/1,000,000 of the power consumption of color TVs. One day of electricity has completely impacted the indicators of safety, environmental protection, health, etc., and has made amazing contributions to future social development, standing at the peak of the green world as a leader.
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