The smallest permissible insulation resistance of the windings of DC machines

Free technical library

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

Annex 3.1. The lowest permissible insulation resistance of the windings of DC machines. 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 32

Winding temperature, °С	Insulation resistance, R₆₀, MOhm, at rated voltage of machines, V
Winding temperature, °С	230	460	650	750	900
10	2,7	5,3	8,0	9,3	10,8
20	1,85	3,7	5,45	6,3	7,5
30	1,3	2,6	3,8	4,4	5,2
40	0,85	1,75	2,5	2,9	3,5
50	0,6	1,2	1,75	2,0	2,35
60	0,4	0,8	1,15	1,35	1,6
70	0,3	0,5	0,8	0,9	1,0
75	0,22	0,45	0,65	0,75	0,9

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:

A New Way to Control and Manipulate Optical Signals 05.05.2024

The modern world of science and technology is developing rapidly, and every day new methods and technologies appear that open up new prospects for us in various fields. One such innovation is the development by German scientists of a new way to control optical signals, which could lead to significant progress in the field of photonics. Recent research has allowed German scientists to create a tunable waveplate inside a fused silica waveguide. This method, based on the use of a liquid crystal layer, allows one to effectively change the polarization of light passing through a waveguide. This technological breakthrough opens up new prospects for the development of compact and efficient photonic devices capable of processing large volumes of data. The electro-optical control of polarization provided by the new method could provide the basis for a new class of integrated photonic devices. This opens up great opportunities for ... >>

Primium Seneca keyboard 05.05.2024

Keyboards are an integral part of our daily computer work. However, one of the main problems that users face is noise, especially in the case of premium models. But with the new Seneca keyboard from Norbauer & Co, that may change. Seneca is not just a keyboard, it is the result of five years of development work to create the ideal device. Every aspect of this keyboard, from acoustic properties to mechanical characteristics, has been carefully considered and balanced. One of the key features of Seneca is its silent stabilizers, which solve the noise problem common to many keyboards. In addition, the keyboard supports various key widths, making it convenient for any user. Although Seneca is not yet available for purchase, it is scheduled for release in late summer. Norbauer & Co's Seneca represents new standards in keyboard design. Her ... >>

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. ... >>

Random news from the Archive

Ultra-precise tangled atomic clock 25.06.2014

Maintaining quantum entanglement makes it possible to increase the accuracy of atomic clocks by a hundred or more times, which will significantly improve the accuracy of measuring time intervals and geographical coordinates and ensure a high degree of protection of transmitted information.

Physicists from the United States and Denmark have proposed the creation of a global network of ultra-precise atomic clocks that use quantum entanglement to increase the accuracy of their work. The scientists published their study in the journal Nature Physics, and a brief summary of it can be found on the Nature website.

Experts put forward the idea of equipping geographically remote atomic clocks connected in an optical network with a special protocol that implements entangled quantum states between the particles of the system's atomic clock. The work of the system is coordinated by a central node capable of creating special quantum states with other nodes.

The work of ordinary atomic clocks is based on the constancy of the energy difference between certain atomic levels: an electron, passing from one level to another, emits a photon, the frequency of which is strictly fixed. Such processes can be periodic in nature, which is used in the operation of atomic clocks. Atomic clocks are very accurate: modern hydrogen clocks have an error of about 45 nanoseconds in 12 hours.

To implement quantum entanglement, a pair of linked (entangled) subsystems (for example, particles) separated by a distance is used. The subsystems of such a system, according to the laws of quantum mechanics, retain information about the state of their partner even when moving away from each other, so that a change in the state of one subsystem affects the state of another subsystem. This is accompanied by a change in certain quantum characteristics of particles, such as spin states. The phenomenon of entanglement is essentially quantum in nature and has no classical analogue.

Maintaining quantum entanglement makes it possible to increase the accuracy of atomic clocks by a hundred or more times; the error can be about one second in 300 million years. This will significantly improve the accuracy of measuring time intervals, geographic coordinates and provide a high degree of protection of transmitted information.

Other interesting news:

▪ Call across the stratosphere

▪ Robot lizard travels through the sand

▪ A method for accurately determining biological age has been created

▪ Electricity from sea lettuce

▪ Virtual nanoreactor will invent new chemical reactions

News feed of science and technology, new electronics

Interesting materials of the Free Technical Library:

▪ section of the site Visual illusions. Article selection

▪ article Trade unions - the school of communism. Popular expression

▪ article Which rivers of the world are in the top ten in terms of length? Detailed answer

▪ article Capers prickly. Legends, cultivation, methods of application

▪ article Microcontroller PIC16C84. Short description. Encyclopedia of radio electronics and electrical engineering

▪ article Miracle album. Focus Secret

Leave your comment on this article:

All languages of this page

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