Abstract
The transmission and radiation of underground variable frequency electromagnetic waves will seriously interfere with the operation of the power cable and its surrounding environment. At present, the test methods for power cables basically require the impedance of the test system to match the characteristic impedance of the cable. The defect is that the process of designing and making the impedance matching impedance network is relatively complex and requires high manufacturing accuracy. In order to solve these problems, this paper puts forward the electromagnetic field fast detection formula and electromagnetic field shielding method of underground variable frequency power cable. The research method of this paper is the principle of shielding electromagnetic field materials and the suppression principle of shielding layer for electromagnetic coupling. The function of the two principles is to study the reflection, absorption, and multiple reflection of electromagnetic waves and to study the cut-off frequency of the nonmagnetic shielding layer. These two principles guide the experiment. In this paper, the measurement formula of the shielding performance of mismatched cables is derived through experiments. The results show that the error of the measurement formula is no more than 8 dB. Then, through the experiment of restraining the interference of magnetic materials on the electromagnetic field, it is concluded that the magnetic field shielding performance can reach 20 dB. Then, through the performance test of electromagnetic field shielding materials, the shielding efficiency of metal fiber antiradiation materials is the largest, and the average efficiency reaches 76.4 dB.
Highlights
Background. e power cable is mainly used as the feeder of wireless transmitting and receiving equipment and is used as the internal connection line and wiring of various communication equipment and electronic equipment. ey are widely used in microwave relay, radar, communication, radio, television, military, aerospace, and other fields. ey are an important communication part of the device. e cable itself is an effective receiving and radiating antenna. ere is a large distributed capacity and mutual inductance between conductors, resulting in signal leakage between conductors
In order to eliminate its influence, various measures have been taken to protect the electromagnetic field. e shielding effect of the shielding component is caused by the absorption attenuation and reflection attenuation of electromagnetic waves
In the United States, experts in electromagnetic field research point out that more and more people are increasing the incidence rate of cancer and other diseases due to long-term exposure to electromagnetic radiation, and the high-frequency electromagnetic waves are more harmful to the basic tissues of organisms and have long-term and potential hazards to human health
Summary
In the United States, experts in electromagnetic field research point out that more and more people are increasing the incidence rate of cancer and other diseases due to long-term exposure to electromagnetic radiation, and the high-frequency electromagnetic waves are more harmful to the basic tissues of organisms and have long-term and potential hazards to human health. It will cause strong interference and even disastrous consequences to all kinds of civil or military electronic and electrical products [1]. This paper studies the suppression effect of wiring and grounding methods on cable coupling, which expands the service conditions of cables and is conducive to the application of practical cables
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