Protection of equipment from emergency operation of the network, uninterruptible power supply units. Schemes, articles of the Free Technical Library

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Protection of equipment from network emergency modes, uninterruptible power supplies. Schemes, articles, descriptions

Free library / Schemes of radio-electronic and electrical devices

Protection of equipment from emergency operation of the network, uninterruptible power supplies

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Wind energy

Section Alternative energy sources. Wind turbines (WPPs) have now reached the level of commercial maturity and in places with favorable wind speeds can compete with traditional sources of electricity. Of the various devices that convert wind energy into mechanical work, in the vast majority of cases, bladed machines with a horizontal shaft installed in the direction of the wind are used. Devices with a vertical shaft are much less commonly used. ... >>

Security of the apartment with notification by telephone line

Section Security devices and signaling of objects. The device is connected to the telephone line in parallel with the telephone set or according to the parallel telephone connection scheme and is designed to protect the apartment from penetration through windows or doors, depending on the installation location of the F1...Fn sensors. When an alarm sensor is triggered, neighbors or relatives are notified via a telephone line with a prearranged signal, and also turns on a siren or a bell for 3 minutes. If necessary, the number of the notified subscriber can be easily replaced by rearranging the jumpers in the dialing field ... >>

Foreign integrated low frequency amplifiers

Section Reference materials. At present, a wide range of imported low-frequency integrated amplifiers has become available. Their advantages are satisfactory electrical parameters, the ability to select microcircuits with a given output power and supply voltage, stereo or quad performance with the possibility of bridging. For the manufacture of a structure based on an integral ULF, a minimum of attachments is required. Using known-good components ensures high repeatability and typically no further tuning is required. ... >>

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Articles on the protection of electrical equipment, uninterruptible power supplies

Articles on the protection of electrical equipment, uninterruptible power supply units; schemes of protection devices for electrical equipment, uninterruptible power supply units; descriptions of protection devices for electrical equipment, uninterruptible power supplies: 140 articles

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Latest news of science and technology, new electronics:

Artificial leather for touch emulation 15.04.2024

In a modern technology world where distance is becoming increasingly commonplace, maintaining connection and a sense of closeness is important. Recent developments in artificial skin by German scientists from Saarland University represent a new era in virtual interactions. German researchers from Saarland University have developed ultra-thin films that can transmit the sensation of touch over a distance. This cutting-edge technology provides new opportunities for virtual communication, especially for those who find themselves far from their loved ones. The ultra-thin films developed by the researchers, just 50 micrometers thick, can be integrated into textiles and worn like a second skin. These films act as sensors that recognize tactile signals from mom or dad, and as actuators that transmit these movements to the baby. Parents' touch to the fabric activates sensors that react to pressure and deform the ultra-thin film. This ... >>

Petgugu Global cat litter 15.04.2024

Taking care of pets can often be a challenge, especially when it comes to keeping your home clean. A new interesting solution from the Petgugu Global startup has been presented, which will make life easier for cat owners and help them keep their home perfectly clean and tidy. Startup Petgugu Global has unveiled a unique cat toilet that can automatically flush feces, keeping your home clean and fresh. This innovative device is equipped with various smart sensors that monitor your pet's toilet activity and activate to automatically clean after use. The device connects to the sewer system and ensures efficient waste removal without the need for intervention from the owner. Additionally, the toilet has a large flushable storage capacity, making it ideal for multi-cat households. The Petgugu cat litter bowl is designed for use with water-soluble litters and offers a range of additional ... >>

The attractiveness of caring men 14.04.2024

The stereotype that women prefer "bad boys" has long been widespread. However, recent research conducted by British scientists from Monash University offers a new perspective on this issue. They looked at how women responded to men's emotional responsibility and willingness to help others. The study's findings could change our understanding of what makes men attractive to women. A study conducted by scientists from Monash University leads to new findings about men's attractiveness to women. In the experiment, women were shown photographs of men with brief stories about their behavior in various situations, including their reaction to an encounter with a homeless person. Some of the men ignored the homeless man, while others helped him, such as buying him food. A study found that men who showed empathy and kindness were more attractive to women compared to men who showed empathy and kindness. ... >>

Random news from the Archive

Voltmeter for a living cell 17.01.2008

American biophysicists have discovered that there are gigantic electric fields inside a living cell.

The smallest of the voltmeters is not an electronic, but a photonic device. This is a dye nanoparticle with a diameter of 30 nm. If it is illuminated with blue light, the particle will give a double impulse - green and red, and the ratio of the intensities of these colors will depend on the electric field strength in the place where the particle is located. Thousands of such voltmeters can be placed in one living cell.

This is exactly what the creators of the method did - scientists from the University of Michigan, led by Raoul Kopelman. The result they got surprised them. It turned out that in the cytosol, which fills the interior of the cell, the electric field is extremely high, its intensity is up to 15 million V/m. This is one and a half thousand times more than under a high-voltage power line!

"Until now, it was believed that the potential exists only on the cell membrane, and there is no field inside it. However, no one before us could measure this field. Now we have to look for a mechanism that causes the appearance of such a strong field inside a living cell. I suspect that this search will cause a lot of trouble for biophysicists," Raul Kopelman believes.

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