Test voltages of industrial frequency of isolation of semiconductor converters

Free technical library

ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
Free library / Encyclopedia of radio electronics and electrical engineering / Electrician

Annex 3.1. Test voltages of industrial frequency of isolation of semiconductor converters. Encyclopedia of radio electronics and electrical engineering

Free technical library

Encyclopedia of radio electronics and electrical engineering / Rules for the technical operation of consumer electrical installations (PTE)

Comments on the article

Table 7
Rated voltage, V Test voltage, kV Rated voltage, V Test voltage, kV
to 24 0,5 201 - 500 2,0
25 - 60 1,0 over 500 2,5 U_slave + 1, but not more than 3*
61 - 200 1,5

* Uwork - the effective value of the voltage of the circuit under test.

See other articles Section Rules for the technical operation of consumer electrical installations (PTE).

Read and write useful comments on this article.

<< Back

Latest news of science and technology, new electronics:

The world's tallest astronomical observatory opened 04.05.2024

Exploring space and its mysteries is a task that attracts the attention of astronomers from all over the world. In the fresh air of the high mountains, far from city light pollution, the stars and planets reveal their secrets with greater clarity. A new page is opening in the history of astronomy with the opening of the world's highest astronomical observatory - the Atacama Observatory of the University of Tokyo. The Atacama Observatory, located at an altitude of 5640 meters above sea level, opens up new opportunities for astronomers in the study of space. This site has become the highest location for a ground-based telescope, providing researchers with a unique tool for studying infrared waves in the Universe. Although the high altitude location provides clearer skies and less interference from the atmosphere, building an observatory on a high mountain poses enormous difficulties and challenges. However, despite the difficulties, the new observatory opens up broad research prospects for astronomers. ... >>

Controlling objects using air currents 04.05.2024

The development of robotics continues to open up new prospects for us in the field of automation and control of various objects. Recently, Finnish scientists presented an innovative approach to controlling humanoid robots using air currents. This method promises to revolutionize the way objects are manipulated and open new horizons in the field of robotics. The idea of controlling objects using air currents is not new, but until recently, implementing such concepts remained a challenge. Finnish researchers have developed an innovative method that allows robots to manipulate objects using special air jets as "air fingers". The air flow control algorithm, developed by a team of specialists, is based on a thorough study of the movement of objects in the air flow. The air jet control system, carried out using special motors, allows you to direct objects without resorting to physical ... >>

Purebred dogs get sick no more often than purebred dogs 03.05.2024

Caring for the health of our pets is an important aspect of the life of every dog owner. However, there is a common assumption that purebred dogs are more susceptible to diseases compared to mixed dogs. New research led by researchers at the Texas School of Veterinary Medicine and Biomedical Sciences brings new perspective to this question. A study conducted by the Dog Aging Project (DAP) of more than 27 companion dogs found that purebred and mixed dogs were generally equally likely to experience various diseases. Although some breeds may be more susceptible to certain diseases, the overall diagnosis rate is virtually the same between both groups. The Dog Aging Project's chief veterinarian, Dr. Keith Creevy, notes that there are several well-known diseases that are more common in certain breeds of dogs, which supports the notion that purebred dogs are more susceptible to disease. ... >>

Random news from the Archive

Rest on your haunches 11.03.2020

Modern man lives differently than his distant ancestors, and this is often seen as the cause of various chronic diseases - obesity, diabetes, cardiovascular diseases, etc. In this case, ancestors are understood to be hunter-gatherers who did not yet know cattle breeding and nothing was grown. And in order to be healthy, you need to eat like your ancestors (that is, adhere to the so-called paleo diet), sleep like your ancestors, move as much as your ancestors.

Employees of the University of Southern California, along with colleagues from other research centers, distributed devices to people from the Hadza people that tracked periods of activity and periods of rest. The Hadza live in Tanzania, hunting and gathering - that is, they lead an "ancestral" way of life, and therefore anthropologists and other researchers often come to them, who are trying to understand how a person has changed since ancient times. It turned out that the period of physical activity in the Hadza is three times longer than recommended by health authorities in the United States. But besides, the Hadza spend 9-10 hours a day at rest - almost as much as an ordinary modern person leading a sedentary lifestyle. However, the Hadza do not have "sedentary" chronic diseases.

Scientists have suggested that the matter is not only in the greater mobility of the Hadza, but also in the fact that their rest is healthier than ordinary sitting. Still, these hunter-gatherers do not sit on sofas or chairs - they either squat or lean on their knees. In both poses - both squatting and leaning on your knees - the muscles of the legs should tighten.

The researchers used additional gadgets that measured the activity of the leg muscles, and it turned out that in a squatting position, the muscles are actually much more active than when a person sits on the buttocks. Perhaps the Hadza are protected from "sedentary" chronic diseases by the fact that even during rest, their muscles - at least some of them - continue to work.

Other interesting news:

▪ New ship mooring system with powerful electromagnets

▪ Graphene from boron

▪ Seebeck magnetic effect

▪ Apples won't turn brown

▪ Supercomputer Aurora

News feed of science and technology, new electronics

Interesting materials of the Free Technical Library:

▪ section of the site Power supply. Article selection

▪ article Disrespect-Trough. Popular expression

▪ article What is malaria? Detailed answer

▪ Reseda's article is yellow. Legends, cultivation, methods of application

▪ article Antenna with active power for 14, 21, 28 MHz. Encyclopedia of radio electronics and electrical engineering

▪ article Scarves from a newspaper sheet. Focus Secret

Leave your comment on this article:

All languages of this page

Home page | Library | Articles | Website map | Site Reviews