Equipotential shielding voltage sensor for contact measurement of transient voltage in EHV/UHV power grids

Abstract

In this study, an equipotential shielding voltage sensor is proposed to achieve contact measurement of transient voltage in extra‐high voltage (EHV)/ultra‐high voltage (UHV) power grids. Two design versions of the voltage sensor for engineering application are described. One version of the sensor is designed as a miniaturized sensor for non‐disturbing measurement of potential distribution along power electronic equipment under transient voltage. The other version is designed for online measurement and monitoring in alternating current EHV/UHV power grids. Based on the design parameters, the performance of the sensor is evaluated, including stability of measurement, shielding effect against the interference from adjacent objects and frequency bandwidth. In order to verify the performance of this sensor, an experimental comparison between this sensor and a standard capacitive voltage divider used in high voltage laboratory was carried out and the results of comparison are presented. The results show that the difference of measured peak voltage between the two devices is no more than ±5%, and the difference of measured time parameters between the two devices is no more than ±15%.

Optimising the electroluminescence performance of ZnS: Cu/epoxy composites via exploring the relationship between electroluminescence intensity and filler intrinsic attributes

“…The breakdown electric field strength data are arranged in an increasing order and the correlation coefficients are calculated by the least square method of linear fitting as shown in equation (4).…”

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Explorative Study on a Novel Ellipsometry Detection Method for Space Charge Inside Solid Insulation: Towards High Temporal and Spatial Resolutions

“…Therefore, the spatial resolution of the system indicates that the measured results can only present the net charge distribution at each position inside the sample. For the measurement methods based on elastic wave signals, the spatial resolution can be calculated by (1). where v is propagation speed of signal inside the sample.…”

“…The insulation system that supports the stable operation of power electronic equipment has gradually become a large limitation. One of the main reasons for this situation is that electronic equipment usually operates in highfrequency electrical stress environment [1], [2]. The traditional evaluation techniques for insulation performance under DC and low-frequency AC conditions are no longer suitable for high-frequency conditions [3], [4].…”

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“…Transient measurement is the foundation of clarifying lightning, arc, plasma, and switching operations [1][2][3][4][5]. Appropriate triggering of the acquisition devices is critical to rapidly measure the transient voltages [6][7][8].…”