Broadband online measurement sensor for DC extra-high voltage corona current

Abstract

The invention relates to a broadband online measurement sensor for DC extra-high voltage corona current, which comprises an isolation electrode unit, a signal processing unit and a system power supply unit, wherein the isolation electrode unit comprises an insulated isolation sleeve, a hollow tubular long arm low-voltage electrode and a hollow tubular short arm high-voltage electrode, wherein two ends of the insulated isolation sleeve are respectively in security isolation connection with the high-voltage electrode and the low-voltage electrode in a special way; the signal processing unit consists of a sampling resistor module, a signal acquisition module, a signal conversion module and a signal transmission module; the system power supply unit comprises a storage battery pack and a charging module; and the signal processing unit and the system power supply unit are arranged in the isolation electrode unit, so that the high-accuracy integral measurement sensor can be formed. The broadband online measurement sensor solves the problems of shielding disturbance of a strong electric field between an acquired signal and an acquisition channel as well as surrounding stray capacitance, and realizes the broadband domain online measurement and the multi-point network online measurement of the DC extra-high voltage corona current.

Description

technical field [0001] The invention relates to a wide-frequency on-line measurement sensor for DC UHV corona current, in particular to the field of DC UHV power equipment test, wide-frequency domain on-line measurement and multi-point networked on-line measurement of DC UHV corona current. Background technique [0002] With the continuous adjustment of my country's energy structure and the widespread use of clean energy, the power industry, one of the clean energy sources, will be a strategic focus of national development. During the period of my country's "Twelfth Five-Year Plan", the State Grid will rapidly develop the construction of DC UHV transmission projects. It is expected that 16 DC UHV transmission circuits will be put into operation in 2015. In recent years, domestic and foreign electric power scientific research institutes have increasingly deepened the broadband research field of DC UHV corona current. It has become a global developed country to build a high-qu...

AI Technical Summary

Problems solved by technology

However, with the continuous improvement of the DC UHV level, the frequency of its corona current will also increase; in harsh natural environments and strong electromagnetic environments, the frequency of circuit corona currents can be as high as 100 megahertz. Some high-frequency sampling resistance sensors and high-frequency measurement systems are difficult to realize the measurement of corona currents at the hundreds of megahertz level, which is exactly the problem that the present invention needs to solve

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