High-voltage direct current broadband domain corona current measurement system

Abstract

The invention provides a high-voltage direct current broadband domain corona current measurement system. The high-voltage direct current broadband domain corona current measurement system comprises a sampling resistance sensor, an extra-high voltage local measurement unit, an optical fiber transmission unit, a safe location measurement unit and an upper computer. The sampling resistance sensor samples the corona current signals of a high-voltage direct current, and converts the corona current signals to voltage signals. The extra-high voltage local measurement unit collects the voltage signals, and optical signals are obtained through photovoltaic conversion. The optical signals are transmitted to the safe location measurement unit through the optical fiber transmission unit. The safe location measurement unit converts the optical signals to the voltage signals. The upper computer processes, stores and displays the voltage signals. The high-voltage direct current broadband domain corona current measurement system has the advantages of being wide in measured frequency range, strong in capability of resisting electromagnetic interference and the like and can have a long-term and stable operation under the environment of extra-high voltage direct current and under the condition of all kinds of bad natural environment conditions, and provides effective technical means for further research of high voltage direct current corona characteristics.

Description

technical field [0001] The invention belongs to the field of high-voltage test equipment and measurement technology, and in particular relates to a high-voltage direct current wide-frequency domain corona current measurement system. Background technique [0002] In order to implement the national energy policy and ensure the comprehensive, coordinated, sustainable and healthy development of the power industry, the State Grid Corporation of my country has proposed a major strategic measure to accelerate the development of AC and DC UHV power grids according to China's national conditions. UHV transmission is developed on the basis of ultra-high voltage transmission, which can realize long-distance and large-capacity transmission of electric energy, and is suitable for the interconnection of large-scale power grids. Unlike UHV AC transmission, UHV DC transmission lines have lower cost and lower power loss, and are more suitable for ultra-long-distance large-capacity power tran...

AI Technical Summary

Problems solved by technology

In the past, the measurement of corona current in the power system only focused on the study of corona loss, and the sampling frequency of the traditional measurement system was low (usually below 2MHz), and the measurement performance was far from meeting the research on audible noise, radio interference and DC synthetic electric field of UHV transmission lines. need

Driven by the research needs of corona current, China Electric Power Research Institute has successfully developed a sampling sensor with a frequency response of 30MHz. The China Southern Power Grid Technology Research Center and Tsinghua University have developed a corona current measurement system with a bandwidth of 50MHz. It cannot meet the needs of research on UHV DC corona characteristics, and needs to further develop a measurement system with a higher sampling frequency

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