Basis for electromagnetic environment monitoring o

2022-08-12
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Jinzhou high voltage electric wire electromagnetic environment monitoring basis

Jinzhou high voltage electric wire electromagnetic environment monitoring basis dljnheh

Jinzhou high voltage electric wire electromagnetic environment monitoring basis different heating depths can be obtained by using different frequencies of AC. this is because the eddy current is not evenly distributed in the metal. The closer the eddy current is to the metal surface layer, the stronger the current is, and the higher the frequency is, the more obvious this phenomenon is, It is called "skin effect"

wavelength and frequency determine another characteristic of electromagnetic field: electromagnetic wave is carried by small particle photons. Photons of high-frequency (short wavelength) electromagnetic waves carry more energy than photons of low-frequency (long wavelength) electromagnetic waves

the generator can operate "in reverse" and become a motor. For example, with Faraday disc as an example, let a DC current be driven by voltage and pass through the conductive shaft arm. Then according to Lorentz's law of force, the moving charge is subjected to the force of magnetic field B, and this force will rotate the disc in the direction set by Fleming's left-hand rule. In the case of no irreversible effect (such as more friction or Joule heat of V-shaped pattern and Mayer impact specimen), the rotation rate of the disc must make D φ B/dt is equal to the voltage of the driving current. In industry, induction heating is divided into four types according to frequency: power frequency (50 Hz); Intermediate frequency (0.5 ~ 8 kHz); Ultra audio (20 ~ 60 kHz); High frequency (60 ~ 600 kHz). Power frequency AC is directly provided by distribution transformer; Medium tension testing machine enterprises should not only cooperate with instrument and equipment enterprises, but also generate alternating current with frequency driven by three-phase motors or silicon controlled inverters; Super audio and high frequency AC are generated by high-power electron tube oscillator. According to the electromagnetic environment monitoring of Jinzhou high voltage power line, the electromagnetic field with insufficient photon energy to destroy molecular chemical bonds is called "non ionizing radiation". Some artificial sources of electromagnetic fields that make up an important part of our modern life, such as electric power (power transmission and transformation, household appliances, etc.), microwave (microwave ovens, microwave signal transmission towers, etc.), radio waves (mobile communications, radio and television transmission towers, etc.), are at the opposite end of the long wavelength and low frequency in the electromagnetic spectrum, and their photons have no ability to destroy chemical bonds. Induction heating method is also widely used in the heat treatment of steel parts, such as quenching, tempering, surface carburization, etc. for example, gears, shafts, etc. only need to be quenched to improve the hardness and wear resistance. It can be put into the hollow coil with high-frequency AC. the surface layer can rise to the high temperature required for quenching in a few seconds, and its color is red, while its internal temperature rises very little, and then it can be cooled quickly with water or other quenchants, For other heat treatment processes, medium frequency or power frequency can be selected according to the required heating depth

the purpose of coreless induction furnace is to smelt cast iron, steel, alloy steel, copper, aluminum and other non-ferrous metals. The frequency of AC used should be selected according to the mass of metal that the crucible can hold, so as to achieve the desired effect. For example: 20 kHz for 5kg, 2.5 kHz for 100kg, 1 kHz to 50 kHz for 5T

the energy derived from electromagnetic radiation depends on the frequency and intensity. Generally speaking, the higher the frequency, the greater the intensity, and the greater the energy

the electromagnetic wave generated by the interactive change of electric field and magnetic field, and the phenomenon of electromagnetic wave emission or leakage into the air is called electromagnetic radiation. Electromagnetic radiation is an invisible and untouchable field. The earth, where human beings live, is a large magnetic field. The thermal radiation and lightning on its surface can produce electromagnetic radiation, and the sun and other planets also produce electromagnetic radiation from outer space. The natural magnetic field, sunlight and household appliances around human beings will emit radiation of different intensities. Electromagnetic radiation is an external manifestation of the moving state of atoms and molecules in matter

put the smelted metal into the smelting pot, let the high-frequency alternating current pass through the coil, and a strong eddy current will be generated in the smelted metal, resulting in a large amount of heat to melt the metal. This smelting method is fast, easy to control the temperature, and can avoid harmful impurities from mixing into the smelted metal, which is suitable for smelting special alloys and special steels. According to the electromagnetic environment monitoring of Jinzhou high voltage power lines, the electromagnetic field whose photon energy is not enough to destroy molecular chemical bonds is called "the comprehensive support ability of new materials in the key field of non ionizing radiation has been significantly improved". Some artificial sources of electromagnetic fields that make up an important part of our modern life, such as electric power (power transmission and transformation, household appliances, etc.), microwave (microwave ovens, microwave signal transmission towers, etc.), radio waves (mobile communications, radio and television transmission towers, etc.), are at the opposite end of the long wavelength and low frequency in the electromagnetic spectrum, and their photons have no ability to destroy chemical bonds

the generator can operate "in reverse" and become a motor. For example, with Faraday disc as an example, let a DC current be driven by voltage and pass through the conductive shaft arm. Then according to Lorentz's law of force, the moving charge is subjected to the force of magnetic field B, and this force will rotate the disc in the direction set by Fleming's left-hand rule. In the absence of irreversible effects (such as friction or Joule heat), the rotation rate of the disc must be such that D φ B/dt is equal to the voltage of the driving current

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