Development of a sensor for corona current measurement under high-voltage direct-current transmission lines

Abstract

A sensor-based distributed measurement system is designed for collecting and monitoring the corona current under the extremely high-voltage direct-current transmission lines. It is highly significant for researching the corona characteristics of extremely high-voltage direct-current transmission lines to reduce the corona effect, operating loss, and environmental impact. A new shared memory strategy has been studied based on field-programmable gate array and ARM. Based on field-programmable gate array technology, the fiber-optic transmission scheme for wide-frequency corona current highspeed signal has been set up to ensure the safety and the reliability of corona current measurement system. The proposed system has been used in China's state grid high-voltage direct-current test base and the in situ power transmission projects. Based on the experimental results, the proposed measurement system demonstrates that it can adapt to the complex electromagnetic environment under the transmission lines and can accomplish the accurate, flexible, and stable demands of the electric-field measurement.

Research of Magnetic Shielding on the Closing Gap of Optical Fiber Current Sensor

“…Compared with traditional electromagnetic sensors, optical fiber current sensors (OFCSs) are smaller, lighter, and more flexible, with stronger immunity against electromagnetic interference and wider dynamic range. Therefore, OFCSs have been widely used in many fields, such as HVDC projects, new generation intelligent substations [7][8][9][10][11], and metallurgy [12].…”

Stratospheric Observations of Corona Current from Loon’s Superpressure Balloons

“…Corona current measurements have previously been reported in the literature (Xin and Yuan 2016), including from the ground to measure total flash rates of storms overhead (Williams et al 1989) and using coronasondes to measure the electrical environment within a thunderstorm (Byrne et al 1986(Byrne et al , 1989. There have been systematic campaigns using aircraft at 15-20 km to measure the electric field and conductivity above thunderstorms in order to better understand their relationship to Wilson currents and the global electrical circuit (Blakeslee et al 1989).…”

A Feasibility Study of the Application of Signal Processing Techniques to Corona Discharge Characterization on HVDC Systems

“…High-voltage direct-current (HVDC) systems are emerging as a promising technology for long-distance bulk power delivery due to their lower cost and reliability compared to high-voltage alternating-current (HVAC) systems [1][2][3][4]. In this context, the measurement of corona current plays an essential role within HVDC systems since it provides important information, such as corona discharge occurrence, electromagnetic interferences HV, and electrical current intensity, among other features [5][6][7][8][9]. Owing to that, researchers have made efforts to promote new strategies of monitoring and inspection of HVDC systems through the use of contact and non-contact measurement solutions.…”

“…Owing to that, researchers have made efforts to promote new strategies of monitoring and inspection of HVDC systems through the use of contact and non-contact measurement solutions. Accordingly, many approaches have been proposed to establish the HVDC detection based on the development of corona current measurement sensing devices [6,[9][10][11], and electromagnetic field measurement sensing devices [4,5,7,12].…”