Current probe-based on-line measuring system for high-frequency corona pulse current on high-voltage line

Abstract

The invention relates to a current probe-based on-line measuring system for high-frequency corona pulse current on high-voltage line, belonging to the fields of high voltage testing devices and measuring techniques. The measuring system comprises a power supply probe, a filtering loop, an A / D (alternative current / direct current) converter, an electro-optic converter, a photoelectric converter and a computer, wherein the power supply probe is used for acquiring a corona pulse original signal; the filtering loop is used for processing acquired signals; the A / D converter is used for carrying out A / D conversion on a filtering signal; the electro-optic converter is used for carrying out electro-optic conversion on a digital signal so as to convert the digital signal into an optical signal; the photoelectric converter is used for converting the optical signal into a digital signal; and the computer is used for processing the digital signal of the photoelectric converter so as to obtain a high frequency corona pulse current waveform. The measuring system can be arranged at different positions of a high voltage circuit so as to measure the corona current distribution situation on the high voltage circuit, and has outstanding engineering application values on further analyzing a corona current pulse characteristic and a transmission characteristic as well as hearable noises and wireless electric interference generated by the characteristics.

Description

technical field [0001] The invention relates to an on-line measurement system for high-voltage line high-frequency corona pulse current based on a current probe, which belongs to the field of high-voltage test equipment and measurement technology. Background technique [0002] Corona current is a physical quantity directly related to corona loss and environmental effects, and it is also the most direct parameter to characterize corona discharge on high-voltage transmission lines. However, there are several outstanding problems in corona current measurement: 1. The measurement location is high potential, which requires high insulation level of the measurement system; 2. The corona pulse amplitude is small and the frequency is high, which requires great sensitivity and bandwidth of the measurement system. High; Third, electromagnetic interference under corona conditions has a great influence on the transmission signal. Therefore, it is difficult to effectively obtain the real...

AI Technical Summary

Problems solved by technology

However, there are several outstanding problems in corona current measurement: 1. The measurement location is high potential, which requires high insulation level of the measurement system; 2. The corona pulse amplitude is small and the frequency is high, which requires great sensitivity and bandwidth of the measurement system. High; Third, electromagnetic interference under corona conditions has a great influence on the transmission signal

Figure 2 shows the corona based on sampling resistance method Current measurement system, which has a complex structure and is significantly affected by electromagnetic environment interference, and the measurement bandwidth cannot meet the high-frequency response requirements of corona pulses

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