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

A pulse current, high-voltage line technology, applied in the direction of measurement using digital measurement technology

Inactive Publication Date: 2012-12-12
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
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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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  • Current probe-based on-line measuring system for high-frequency corona pulse current on high-voltage line
  • Current probe-based on-line measuring system for high-frequency corona pulse current on high-voltage line
  • Current probe-based on-line measuring system for high-frequency corona pulse current on high-voltage line

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Embodiment Construction

[0024] The high-voltage line high-frequency corona pulse current online measurement system based on the current probe proposed by the present invention has a structure as shown in Figure 3, including:

[0025] The power probe is used to collect the original signal of the corona pulse on the high-voltage transmission line, and the power probe is directly placed in a high-voltage environment sufficient to cause the line to corona;

[0026] The filter circuit is used to process the collected current signal, eliminate the high-frequency electromagnetic interference coupled in from the line and the harmonic interference on the power supply side, and the filter circuit is connected to the power probe;

[0027] The A / D converter is used to perform A / D conversion on the current signal obtained after filtering to obtain a digital signal, and the A / D converter is connected to the filter circuit;

[0028] The electro-optical converter is used to electro-optical convert the digital signal...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/25
Inventor 张波杨彬尹晗曾嵘何金良
Owner TSINGHUA UNIV
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