Protection of radio equipment from increased voltage in the network. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Protection of equipment from emergency operation of the network
Comments on the article
Most modern radio equipment has switching power supplies, which, in the event of an overload, fail. Constantly monitoring the mains voltage is inconvenient, and not effective. Overloading while the equipment is running can happen at any time.
The proposed device allows you to prevent damage to electrical appliances and radio equipment from increased voltage. The simplest option for protecting equipment from overload can be performed using a special gas discharger connected after the input fuses. It has such a characteristic that gas breakdown inside the case occurs when the operating voltage exceeds 270 V. A triggered arrester causes the input fuses to burn out, which will interrupt the voltage supply to all switched-on devices.
The main disadvantages of the gas discharger are its scarcity and unregulated response threshold.
The above scheme is similar in principle to the operation of a spark gap. Only instead of it, a more affordable electronic switch triac was used. In this case, the opening threshold VS1 can be set using the resistor R4 at the level of 260 volts (effective value). Capacitor C1 eliminates the operation of the circuit from short-term interference (emissions). It is not necessary to install the HL1 LED, but it is convenient to have it when setting up, when the triac control can be temporarily disabled.
Such a scheme is useful for rural areas, when the whole village, as if by agreement, turns off the lighting in chicken coops, greenhouses, etc. And then the whole village is looking for multipliers for TVs.
Publication: cxem.net
See other articles Section Protection of equipment from emergency operation of the network.
Read and write useful comments on this article.
<< Back
Latest news of science and technology, new electronics:
Machine for thinning flowers in gardens
02.05.2024
In modern agriculture, technological progress is developing aimed at increasing the efficiency of plant care processes. The innovative Florix flower thinning machine was presented in Italy, designed to optimize the harvesting stage. This tool is equipped with mobile arms, allowing it to be easily adapted to the needs of the garden. The operator can adjust the speed of the thin wires by controlling them from the tractor cab using a joystick. This approach significantly increases the efficiency of the flower thinning process, providing the possibility of individual adjustment to the specific conditions of the garden, as well as the variety and type of fruit grown in it. After testing the Florix machine for two years on various types of fruit, the results were very encouraging. Farmers such as Filiberto Montanari, who has used a Florix machine for several years, have reported a significant reduction in the time and labor required to thin flowers.
... >>
Advanced Infrared Microscope
02.05.2024
Microscopes play an important role in scientific research, allowing scientists to delve into structures and processes invisible to the eye. However, various microscopy methods have their limitations, and among them was the limitation of resolution when using the infrared range. But the latest achievements of Japanese researchers from the University of Tokyo open up new prospects for studying the microworld. Scientists from the University of Tokyo have unveiled a new microscope that will revolutionize the capabilities of infrared microscopy. This advanced instrument allows you to see the internal structures of living bacteria with amazing clarity on the nanometer scale. Typically, mid-infrared microscopes are limited by low resolution, but the latest development from Japanese researchers overcomes these limitations. According to scientists, the developed microscope allows creating images with a resolution of up to 120 nanometers, which is 30 times higher than the resolution of traditional microscopes. ... >>
Air trap for insects
01.05.2024
Agriculture is one of the key sectors of the economy, and pest control is an integral part of this process. A team of scientists from the Indian Council of Agricultural Research-Central Potato Research Institute (ICAR-CPRI), Shimla, has come up with an innovative solution to this problem - a wind-powered insect air trap. This device addresses the shortcomings of traditional pest control methods by providing real-time insect population data. The trap is powered entirely by wind energy, making it an environmentally friendly solution that requires no power. Its unique design allows monitoring of both harmful and beneficial insects, providing a complete overview of the population in any agricultural area. “By assessing target pests at the right time, we can take necessary measures to control both pests and diseases,” says Kapil ... >>
| Random news from the Archive Ultra-processed foods increase risk of depression
20.11.2023
Spanish scientists have put forward the thesis about the negative impact of certain foods on mental health. According to them, we are talking about ultra-processed foods, which include sugary carbonated drinks, chips, energy drinks, breakfast cereals and fast food.
The study confirms the importance of making informed food choices, especially in the context of ultra-processed foods, and its potential impact on mental health. Given these findings, it is important to develop mindful eating habits to support overall well-being.
As part of the study, more than 150 volunteers were screened to assess their consumption of ultra-processed foods and were regularly tested. The results showed that ultra-processed foods are indeed associated with depression.
In addition, junk food had a negative impact on the volume of certain areas of the brain that play a key role in the process of food choice, as they process information about previous taste perceptions.
|
Other interesting news:
▪ Bear Eve
▪ A new neural interface has been developed
▪ Silicon formats proteins
▪ The first Soviet meteorological satellite deorbited 43 years after launch
▪ Self-propelled pants
News feed of science and technology, new electronics
Interesting materials of the Free Technical Library:
▪ section of the site for the radio amateur-designer. Article selection
▪ article Jester Balakirev. Popular expression
▪ article In what language is the eagle and the liver denoted by one word and why? Detailed answer
▪ article Grids. Tourist tips
▪ article Radio transmitter with FM in the frequency range 1-30 MHz. Encyclopedia of radio electronics and electrical engineering
▪ article An interesting jack. Focus Secret
Leave your comment on this article:
All languages of this page
Home page | Library | Articles | Website map | Site Reviews
www.diagram.com.ua
2000-2024
Arabic
Bengali
Chinese
English
French
German
Hebrew
Hindi
Italian
Japanese
Korean
Malay
Polish
Portuguese
Spanish
Turkish
Ukrainian
Vietnamese