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 high-speed 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.
Highlights
IntroductionThe electromagnetic environment (such as audible noise, radio interference, and total electric field) caused by corona discharge restricts the conductor selection and structural design of transmission line parameters and often brings environmental issues
The electromagnetic environment caused by corona discharge restricts the conductor selection and structural design of transmission line parameters and often brings environmental issues
With the improvement of the energy saving and environmental protection requirements of the transmission line, only relying on measurement and analysis of corona effect, such as audible noise, radio interference, and corona loss, has not met the engineering requirements to study the electromagnetic environment of transmission lines
Summary
The electromagnetic environment (such as audible noise, radio interference, and total electric field) caused by corona discharge restricts the conductor selection and structural design of transmission line parameters and often brings environmental issues. With the improvement of the energy saving and environmental protection requirements of the transmission line, only relying on measurement and analysis of corona effect, such as audible noise, radio interference, and corona loss, has not met the engineering requirements to study the electromagnetic environment of transmission lines. The basic mechanism of the corona discharge can be obtained by measuring the corona current. Because of the weak signal and wide bandwidth of the corona current, the value of corona current is difficult to be measured accurately. In Greason et al.[1] and Kucerovsky et al.,[2] the authors used an optically decoupled data acquisition module to measure the School of Automation Science and Electrical Engineering, Beihang University, Beijing, China
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