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Previous work has proven that transient characteristics of a grounding grid was far more different than its performance at power frequency because of the inductance of the system and the soil ionization phenomena. In this paper, a test on a grounding grid of a 110 kV substation was conducted. Several parameters, such as waveform, peak value and injecting point of lightning, were altered to study their...
When a cloud data center is constructed in the same location as a high voltage substation, the power frequency magnetic field when the substation works normally and the short-time power frequency magnetic field at the time of short circuit may cause hazards to the information storage equipment of the cloud data center constructed on the same site. Through measurements and analyses, this article summarizes...
Since 1960s, no solutions have been found both home and abroad to the theory and protective technology related to hazard influences of a high voltage transmission system on a communication system. Previously, the major technical measure against comprehensive hazards of the strong current is to make them separated. However, in city planning, it is inevitable to arrange them closely or construct them...
The paper studies the performance of the ground system of hydropower plant in different soil conditions. A numerical method coupling MoM to BEM is introduced in the analysis. The parameters of the ground system are calculated in different soil models.
The uniform numerical method is proposed to analyze the transient performances of grounding system with grounded secondary cable. The influences of different factors on the electromagnetic interferences applied on the secondary systems due to the lightning current invading into the substation, including materials of grounding electrodes, lightning current wave-shape, and the parameters of secondary...
This paper discussed the characteristic parameters of the electromagnetic environment (EME) of substation. According to the general demands to EME for secondary devices in substation, the demands to the EMC immunity test for secondary devices in substation are proposed, which satisfy the EMC characteristics of substation.
This paper analyzed the influences of different factors on the electromagnetic interferences applied on the secondary systems due to the short-circuit faults in substation. The secondary cables with sheath grounded in two terminals can effectively suppress the potential difference between the core and sheath of secondary cable. The influence of different factors on the potential difference between...
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