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A new partial discharges multi-targets localization method is presented in this paper, which is based on array signal processing. Two ultrasonic sensor arrays are located on the inner wall of the transformer tank and detect the ultrasonic signal emitted by the partial discharge sources. Spatial spectrum estimation technique is used in analyzing the signal characteristic information (number of signals,...
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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