Relay protection. Application area

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Section 3. Protection and automation

Relay protection. Application area

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

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3.2.1. This chapter of the Rules applies to relay protection devices for elements of the electrical part of power systems, industrial and other electrical installations above 1 kV; generators, transformers (autotransformers), generator-transformer blocks, power lines, tires and synchronous compensators.

Protection of all electrical installations above 500 kV, cable lines above 35 kV, as well as electrical installations of nuclear power plants and direct current transmissions, is not considered in this chapter of the Rules.

Requirements for the protection of electrical networks up to 1 kV, electric motors, capacitor installations, electrothermal installations, see, respectively, in Ch. 3.1, 5.3, 5.6 and 7.5.

Relay protection devices for electrical installations that are not considered in this and other chapters must be carried out in accordance with the general requirements of this chapter.

See other articles Section Rules for the installation of electrical installations (PUE).

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Cover crop plants, clover, grown in soils similar to those of Mars, have shown significant growth in the process of infection with symbiotic nitrogen-fixing bacteria. A researcher from the University of Colorado (USA) Franklin Harris, together with colleagues, presented the results of the study in the publication PLOS ONE.

As the Earth's population grows, researchers are exploring the possibility of farming Martian soil, or "regolith." Regolith lacks some key nutrients, including certain nitrogen-containing molecules that plants need to live. Therefore, agriculture on Mars will require a strategy to increase the amount of these nitrogen compounds in the regolith.

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