Norms of acceptance tests. Overhead power lines with voltage above 1kV

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Section 1 General Rules

Norms of acceptance tests. Overhead power lines with voltage above 1kV

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Encyclopedia of radio electronics and electrical engineering / Rules for the installation of electrical installations (PUE)

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1.8.41. 1. Checking insulators.

Produced by external inspection.

2. Check wire connections.

Produced according to 1.8.27.

3. Measurement of grounding resistance of supports, their guys and cables.

4. Produced in accordance with 1.8.39 and the instructions of chapter 2.4.

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Magnetic diode 10.12.2018

Electrical diodes, which conduct electricity in one direction and block it in the opposite direction, are one of the basic types of electronic components. In the vast majority of cases, diodes can be found in the "core" of any electronic chip or device, which fundamentally cannot work without these devices. In recent years, scientists have developed analogues of diodes that implement the function of one-way conduction for heat, light and sound waves, and recently physicists from the University of Innsbruck and the Institute for Quantum Optics and Quantum Information have created the first magnetic diode and demonstrated its performance in the laboratory.

"Our device makes it possible to transfer the magnetic field from the first magnetic element, for example, a permanent magnet or an inductor, to the second one. But when the roles of these two elements change, the transfer of the magnetic field is blocked," says Jordi Prat Camps, lead researcher. From a technical point of view, this means that the mutual magnetic connection between two elements, which under normal conditions is absolutely symmetrical, becomes radically asymmetric.

The key component of a magnetic diode is an electrical conductor moving at a constant speed in a certain direction through which an electric current flows. “When the conductor is close to the magnetic elements and moves at a given speed, the inductive coupling between the elements becomes unidirectional and a magnetic analogue of the diode is created,” says Jordi Prat Kamps.

Systems of two or more magnetic elements are now used in a variety of key technologies such as electric motors, transformers, magnetic storage devices, and magnetic resonance imaging machines. But all these technologies use elements that have symmetrical magnetic coupling. "The availability of a new magnetic component, the diode, could open up a whole range of new possibilities for existing technologies," says Gerhard Kirchmair. in one direction, from the charging station to the device being charged, but not vice versa.

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