Electrothermal installations. Definitions

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Section 7. Electrical equipment of special installations

Electrothermal installations. Definitions

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

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7.5.3. An electrothermal installation (ETU) is a complex of functionally related elements: specialized electrothermal and other electrical, as well as mechanical equipment, controls, automation and instrumentation, ensuring the implementation of the corresponding technological process.

Depending on its purpose and the design of the equipment, the ETS includes: cable lines, electrical wiring and conductors between the elements of the installation, as well as pipelines of water cooling and hydraulic drive systems; pipelines for lines of compressed air, nitrogen, argon, helium, hydrogen, carbon dioxide and other gases, water vapor or vacuum, ventilation and gas purification systems, as well as elements of building structures (foundations, work platforms, etc.).

7.5.4. Electrothermal equipment (ETE) is electrotechnological equipment designed to convert electrical energy into thermal energy for the purpose of heating (melting) materials.

THIS includes electric furnaces (electric furnaces) and electric heating devices (instruments, apparatus). Electric furnaces differ from electric heating devices in that they have a chamber or bath.

In the varieties of ETU listed in 7.5.1, in the ETU included in these installations, electrical energy is converted into thermal energy mainly in three ways:

directly in specified elements (element) of this circuit or between specified elements (for example, almost completely or partially between one or more electrodes and the charge, ingot) on alternating current of industrial and low frequency, on direct current, and when used in plasma furnaces, induction plasma burners - at high or ultra-high frequency current;
as a result of the creation of an electromagnetic field or electric field at a given element (elements) of the specified circuit, followed by the transformation of the field energy into thermal energy in the heated (melted) material;
by forming a flow of electrons, ions or a laser beam with an impact (the type is determined by the requirements of the technology) on the material being processed, usually on its surface.

The operating voltage of ETU is divided into three classes according to the nominal value:

up to 50 V AC or 110 V DC;
more than the above voltage up to 1600 V AC or DC;
more than 1600 V AC or DC.

7.5.5. Furnace transformer or converter substation is a substation that is part of the ETU, performing the functions and containing the elements specified in Chapter. 4.2 and 4.3.

7.5.6. Furnace power transformer (transformer unit) or autotransformer - respectively, a transformer or autotransformer ETU that converts alternating current electricity from the mains voltage to the operating voltage of an electric furnace (electric heating device).

Furnace converter transformer is a transformer that transmits electricity to the ETU converter (rectifier) device.

7.5.7. Furnace switch is a switch that switches the main AC power circuits of the ETU, an operational protective or operational switch, the functions of which are given in 7.5.10.

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

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