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High Voltage Direct Current (HVDC) transmission technology as a new mode of power transmission is widely used all around the world and becomes more and more important because of its low cost and high reliability. Direct Current (DC) high voltage transformers are one of the most important equipment in HVDC transmission systems. On the basis of the application of DC high voltage transformers, in this...
Residual voltage of SPD connecting to overhead line is closely related to earth potential rise at the grounding terminal of SPD. Characteristics of the SPD residual voltage caused by natural lightning and artificially triggered lightning were analyzed in this paper, and the results show that: 1) In case of the natural lightning, the earth potential can be regard as zero, and the voltage difference...
Optical methods for the measurement of current and voltage in high-voltage (HV) environments have been attracting more and more attention in the recent years. A novel electronic current transformer (ECT) with optical transmitting link and optically powered technology has been designed for metering or protection purposes. The structure of the ECT is described in detail in the paper. An ECT prototype...
The influence of temperature field and stress field on OVS has been analyzed theoretically. The law that temperature Held and stress field affect the stability of optical voltage sensor (OVS) was obtained. Namely, thermal-optic effect by temperature and elato-optic by compressive stress of SF6 have no influence on the performance of OVS, but the phase retardation resulted through thermal-stress by...
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