The VR concept has been a super hurricane in the industry for the past two years, especially in the year of being called the VR first year. Not only is the "pig" blown into the sky, but the trend in the A-share and VR rubbing points is still decent. In addition, there was a wave of VR experience.
At the CES Asia exhibition a few days ago, the smartphone has been unable to stimulate the G point of the audience. The VR equipment booth on the other side is the eye-catching max. After the wearer put on the glasses, they are stunned and screamed. . But the concept is ultimately a concept, and the VR industry chain is still quite immature. As far as hardware is concerned, Oculus is the industry's leading industry benchmark. It is still not a good solution to the problem of vertigo in the PC VR field, let alone the ideal VR usage scene: anytime, anywhere, mobile and lightweight, which even requires VR itself. To the extent of the so-called Mixed Reality MR (Mix Reality), there is the possibility of large-scale use in the consumption field, and there are still hundreds of thousands of miles away from the current technical level. But in this case, if the VR hardware and technology are mature, what changes will happen to the contents of the cultural industry and the Internet industry and their producers? Since domestic science and technology giants always refer to the word ecology, it is a good idea to make a bold guess about VR content and producer changes.
1. The boundaries between film and television dramas and games are gradually blurred.
The film and television drama here refers to the VR film, instead of projecting the traditional film to "a larger screen." VR film and television dramas can provide users with a variety of perspectives to watch, or from the audience's first perspective, which is subversive for traditional film production. Because in today's film and television production, the angle of view and composition are fixed, the director will choose an optimal perspective according to each scene, so as to present the optimal picture effect. But if the perspective is variable, it will have a very interesting experience. For example, the male and female protagonists gradually grew up and slowly approached each other. At this time, as the audience quickly "insert", the audience can imagine that they are one of the protagonists, and hug each other with another movie star, and the lips and teeth blend together... Or the audience can see the muscles of the Captain America during the fight. You can even arrange a scene for the audience to join the Avengers to play, etc. This is basically the same as the current RPG role-playing game. This kind of integrated viewing experience, the integration of the two forms of entertainment, video and games is very natural, and at the same time, why IP is hot, it is not difficult to understand. But in this respect, the front is the porn industry, which really satisfies the needs of many 屌ä¸å®…女YY.
2, stereo scene design will become very important
The mobile phone computers currently used, including various web pages, programs, and UI interfaces, illustrations, and other information elements are basically two-dimensional, and VR naturally needs to add a dimension. The original graphic design will become more of a three-dimensional scene design, and the corresponding talent demand will also become strong. It is foreseeable that existing interior designers and game scene designers will become very popular in the future, and it is a matter of course to transform into a VR scene design.
3. The future will be an increasingly "face-to-face" world.
If one day, VR technology is mature enough to replace PCs and smartphones, as new terminal devices, more and more information will be “imagedâ€. Information displayed in text may be further reduced, and more and more social software may use live images to display content.
The big Vs on Weibo may have to come out from the media. The UGC community users may speak like an offline meeting, and the social experience on the Internet will be closer to real social. Because VR provides such a technical foundation to put people "live" in front of them, it will certainly be fully utilized.
From the previous writing telegram to the subsequent text message, and now to the mobile Internet, the social other party's information is more and more comprehensive, and the image is more and more clear. And in the VR era, it feels no different from the real person standing in front of you! So in the past, the social way of "imagining" by that piece of text, a photo, or a video was gone.
Facebook demonstrated the VR social prototype at the F8 Developers Conference a month ago. The two users can travel the world in a thousand miles, including London streets, Big Ben, and Facebook Labs.
What is the phenomenon at the same time? The influence, popularity and temperament of the user on the Internet will become more and more relevant. Although a person's cultural connotation and moral quality should be an important factor in evaluating him, but there is no way, people are visual animals, and quite a few people will still be judged by the value of others. For ordinary people, being handsome and beautiful is relatively easier to be popular.
4. The music industry has undergone tremendous changes.
When it comes to VR, more people are thinking about visual changes first, and it is easy to ignore this element of sound. VR brings about visual interaction changes, but at the same time the sound becomes an interactive element. The position of the user in the game or movie has changed, and the corresponding sound effect should also change.
The sound itself plays a big role in the movement and influence of human emotions; in VR content, music can make the scene more immersive, but only if there is at least a surround sound like stereo 5.1 or 7.1, which can let the user Perceive the source of sound in all directions.
In the consumption scene, every time you touch an item, every step of the movement will produce a change in sound. Oculus's previous game called "Pastoral" did this, and the picture was so dark that it was difficult for users to visually recognize the position. At this time, it is necessary to rely on hearing to locate. The production of the interactive system of sound is a complex and highly technical work. Therefore, it is inevitable to give birth to a profession called VR sound engineer.
In addition, if the singer opens a concert or a master concert, even if the venue is chosen to be a giant venue such as the Bird's Nest, it can only accommodate tens of thousands of people, and the audience experience far from the stage is also poor. However, if you apply VR technology to the concert, you can not only choose the perspective to feel the warm atmosphere of the scene, but also have a more special way of interacting with the singer. Getting rid of the venue restrictions and the unlimited capacity of the audience means that the increase in concert revenue will also be immeasurable, and it is imperative to ignite the huge potential of the music industry.
The picture shows NEXT VR live Coldplay concert
All of the above are random guesses. What is the future, what form will VR eventually evolve into, and what is the IT world and even the entire real world that it has transformed? Is it true and false, and it is also true? Everything is possible.
The insulation breakdown accident often occurred in generator. It includes interphases short circuit, inter-turn short circuit and ground fault.
The interphase short circuit: the generator windings ends will be greatly impacted by electric power and may make the coil end deformed under two-phase or three-phase short circuit and differential protection tripping happening.
Inter-turn short circuit: Generator outlet blasting, if it continues a long time, the stator copper wire will be melted. When no-load run, the generator three-phase voltage will be imbalance.
Ground fault: Generator breakdown location is in the linear portion or notch position and stator ground protection act. The insulation resistance value between stator ground and ground is zero or minimum.
The fundamental reason of generator insulation breakdown is that the stator coil insulation is weak or there is a corona etching in notch in run time. The treatment method is to find the point of breakdown and reworked and reinforced insulation. At the same time, eliminating the corona etching in a maximum extent is important.
III. A large noise or vibration with generator
The reasons of a large noise or vibration with generator are:
1. Foundation bolts loose, or STG subsidence. Treatment: fastening bolts. Recalibration concentricity.
2. Generator rotor and steam turbine shaft are misalignment. Treatment: calibration concentricity.
3. Bearing wall worn or damaged under short oil. Treatment: repaired bearing or replace a new bearing with same model.
4. There is a friction between the stator and rotor. Treatment: find the friction location and reason, and then eliminate it.
5. Fan or other fasteners loose. Treatment: Tighten fan and fasteners.
6. Rotor coil partial short circuit, two points grounding or wiring errors. Treatment: please inspect the insulation of slip ring and the rotor coil to the ground. Or connect to the DC power source and check the voltage drop of each coil, winding direction and wiring method. So we can identify the cause of the malfunction and eliminate them.
7. Brush is too hard, or the pressure is too large. Treatment: adjust the pressure or replace the same type of brush.
8. Three-phase current are severe asymmetry. Treatment: please investigate that the three-phase current imbalance is in the allowable range or not. If it is not in the allowable range, please adjust three-phase load or reduce the load.
9. Stator winding short circuit or ground. Treatment: Find out the fault and repair it.
10. External fault or lightning strike. Treatment: if the vibration time is too long, please stop the STG and inspect.
Typical
cases:
This is a 15 MW generator from a Shandong customer. The vibration of generator is reached to 0.12mm in running. After inspection the generator, we found that rotor dynamic AC impedance upheaval 12% in 2400-2700 and the dynamic inter-turn short circuit is serious. It destroys the balance of the magnetic field and causes the electromagnetic force uneven of generator rotor. After removal of the rotor retaining ring and treatment the rotor inter-turns, we start the STG. The vibration is about 0.01mm.
IV. The temperature of a generator is too high.
Generally the temperature of a generator will be in the allowable value, if the generator running normally and the current, voltage, frequency, power, excitation current and power factor are all within the allowable fluctuation range. If a generator stator, core and other parts temperature are too high, please consider the following cases:
1. Generator overload operation and exceed the allowable time. Treatment: Please reduce the generator load to the rated load or under rated load as soon as possible.
2. Three-phase current are serious imbalance. Treatment: please find out the reason of imbalance. If it is the voltage causing, please check if it is the generator inter-turn short circuit. If it is load causing, please adjust the load and make it balance.
3. The ventilation cooling system of generator is poor. For example, the temperature is too high, the air duct or exhaust duct are blocked, the coil and its ends are serious fouling. Treatment: please reduce the load suitability, improve ventilation, and remove fouling.
4. The stator winding portion short circuit or ground. Treatment: Find out the short circuit or ground point and repair them, and then eliminate short circuit or ground risks.
5. Insulation of the stator core may be partially damaged and short circuit, so there is a vortex and overheat. Treatment: please reduce the load suitability. If the generator reduces its efficiency obviously, please repair the generator stator core.
6. The bearing is short of lubricating oil. The oil number is wrong. The oil quality is bad. The bearing is installed with a wrong way or the bearing is damaged. Treatment: please find out the reason and then replace the oil or clean, adjust or replace bearing.
V. Generator rotor ground
Symptom: Generator grounding one point or two points grounding light plate light.
Fault Analysis: Generator rotor winding insulation damage, coil deformity and severe dust and greasy attached in the ends seriously are all leading to the grounding of the generator rotor windings. When the generator rotor winding grounding in one point, there is electrical current pass as the ground does not constitute an electrical circuit.
However, after one point grounded, it is easy of leading another grounding point. If any part in excitation circuit ground, it can form ground fault of two or more points ground. It is very dangerous.
After the failure, the rotor windings are short-circuited. Because of the small winding DC resistance, the excitation current will increase. So the magnetic field of generator is out of balance, and main magnetic flux reduces largely. So the STG will vibrant strongly. Meanwhile the power factor of the generator will be increased significantly and get into leading phase running (absorption of reactive power from the grid).
The stator field becomes in the frond and the rotor field becomes in the back. It will make the stator current increases. If the watcher notice that there is no excitation varying but the excitation current and stator current suddenly increases, and the excitation voltage and AC voltage are all suddenly drop, and power factor meter indicates increasing or leading phase, it means the generator rotor grounded or inter-turn short circuited. You should shut down the STG and blow-out magnetic. Please inspect the excitation system and rotor windings, and find out the short circuit point and treat it.
VI. Excitation upgrading and generator test
Excitation system upgrading, brushless exciter changes into the SCR excitation and make the generator maintenance easily. And it removes the disadvantage of brushless excitation dynamic adjustment slowly. The generator test includes stator insulation resistance test, the absorption ratio test, the iron loss test, leak test, AC and DC voltage withstand test, the rotor high speed balancing and overspeed test, dynamic and static AC impedance test, the generator no-load test, short circuit test, temperature rise test, residual pressure measurement, axis voltage measurement.
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