Electrothermal installations. Induction melting and heating appliances

Free technical library

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

Section 3. Electrical installations for special purposes

Chapter 3.2. Electrothermal installations. Induction melting and heating appliances

Free technical library

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

Comments on the article

3.2.27. Paragraphs 3.2.27 - 3.2.33 of this chapter apply to electrothermal induction installations of industrial (50 Hz), increased (up to 30 kHz) and high (over 30 kHz) frequencies.

3.2.28. Acceptance of induction installations for operation is carried out subject to the requirements of these Rules, state standards and rules for the installation of electrical installations, sanitary standards for the level of the electromagnetic field at workplaces and radio interference standards, testing in accordance with the technical documentation of the manufacturer and registration of the radio frequency range in the radio inspection bodies .

3.2.29. To reduce electrical corrosion from leakage currents, metal pipes of the water cooling system must be grounded at the very beginning of their transition to insulated hoses connected to live water-cooled parts.

3.2.30. Water cooling should be carried out continuously from the moment the unit is turned on until the parts are completely cooled after shutdown. The presence of interlocking water cooling with the enabling device of the installation is mandatory.

3.2.31. Personnel servicing induction melting furnaces and heating installations are obliged to systematically monitor the degree of heating of its structural elements from currents induced by electromagnetic stray fields. Depending on the results obtained, measures should be taken to reduce losses.

3.2.32. Installations are inspected by electrical personnel in accordance with the schedule approved by the organization. The results of the inspection and the measures taken to eliminate malfunctions are recorded in the log of the installation. During the inspection, you should pay attention to the following:

type="disc">

failure-free operation of all blocking devices that ensure safe working conditions for personnel and the necessary clarity and sequence of switching on all technological and electrical elements of the installation;

reliability of shielding and grounding of individual units;

the cleanliness of the contacts of the control gear, which has the largest number of switching on and off;

correct operation of contacts with arc extinguishing;

lack of scale on the water-cooled surfaces of the plant parts;

no dust on the installation parts.

3.2.33. Inspection of induction installations and repair work on them are carried out after they are disconnected from power sources.

3.2.34. The cooling system of the inductor of induction melting furnaces must have an interlock that ensures that voltage is removed from the inductor when the water supply is interrupted.

3.2.35. When carrying out melts in induction melting furnaces, it is allowed to touch the charge with a tool with insulated handles. Wear gloves to avoid burns.

3.2.36. The inclusion of loop capacitors under voltage to adjust the oscillating circuit during the melting process in induction melting furnaces is allowed if there are disconnectors with a remote drive. Switching off the loop capacitors under voltage is not allowed.

3.2.37. Heating stations, where heat treatment operations are performed and which are part of specialized units (press-forging and rolling mills, pipe welding machines, etc.), are built into the unit as separate units.

3.2.38. When working at a heating post with open heating inductors connected through a step-down matching high-frequency transformer, the following protective measures should be provided:

type="disc">

control buttons for heating and switching off the heating post should be placed in close proximity to the heating inductor in a place convenient for the thermist operator;

one point of the secondary winding of the matching high-frequency transformer must be grounded anywhere;

the operator-thermist must have personal protective equipment;

a poster should be posted "Installing parts and touching the inductor with a hand when the voltage is on is not allowed."

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

Hybrid smart cards instead of passports 29.12.2014

The growth of tourist flows between states in the next four years will lead to the activation of the market for electronic passports and visas, according to TechNavio. Electronic passports and visas are used to identify the person crossing the border. Typically, personal information is stored on a smart card chip and includes a unique identification number and a digital signature.

The data stored on the chip is protected by a PKI key, with which authentication is performed, which greatly reduces the likelihood of a passport forgery. For the same purpose, the biometric data of the owner is stored on the chip - a digital photo and a fingerprint or an image of the iris.

The average annual growth of the market of e-passports and e-visas from 2015 to 2019 will be 30,17%. As more people travel abroad on business and leisure trips, the need for effective border control becomes greater.

In order to improve the safety of tourists and reduce the risk of terrorist attacks, the International Civil Aviation Organization (ICAO) has obliged its members to implement electronic passports, analysts remind. This not least affects the growth rate of the market. The main trend in the global e-passport market will be the popularization of hybrid (contact-contactless) smart cards, experts say.

Hybrid cards allow you to transfer the same stored information through different interfaces, thereby integrating with different types of readers and passport data processing systems. This eliminates the need to enter several different cards for different types of documents and ensures the ease of interaction of the card with the border control systems of various states.

The main suppliers of e-passports and visas, including those with a hybrid interface, will be the giants of the smart card market - Gemalto, Giesecke and Devrient, Morpho and Oberthur Technologies. Also, such vendors as 4G Identity Solutions, ASK, CardLogic, DataCard, Eastcompeace, HID Global, Infineon Technologies, IRIS and Muhlbauer Group will achieve success in this field.

In addition, NXP Semiconductors' MIFARE hybrid smart cards will be of particular value, according to Faisal Ghaus, vice president of TechNavio. This product, according to analysts, will become the market leader in hybrid e-passports.

"MIFARE cards have functionality that speeds up transactions, support advanced data security technologies, are secure, easy to use, and we expect them to drive the e-passport and visa market in the coming years," he said.

Other interesting news:

▪ Implementation of the C-V2X vehicular communication system

▪ Restoration of hair growth on damaged skin

▪ Bacteria that eat dirt and breathe electricity

▪ Water in the stratosphere shapes the climate

▪ Neanderthals made glue

News feed of science and technology, new electronics

Interesting materials of the Free Technical Library:

▪ site section Clocks, timers, relays, load switches. Article selection

▪ article It is not given to us to predict how our word will respond. Popular expression

▪ article In what month is the Earth closest to the Sun and in what month is it farthest from it? Detailed answer

▪ article Collapsible inflatable sailing catamaran. Personal transport

▪ article A simple 80m transmitter. Encyclopedia of radio electronics and electrical engineering

▪ article Why the Ural-R radio station does not make noise. Encyclopedia of radio electronics and electrical engineering

Leave your comment on this article:

All languages of this page

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