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AC cable internal wave velocity characteristic detection method and detection system

A detection method and technology for AC cables, which are applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve the problem that the positioning error cannot be ignored, and achieve the effects of high sensitivity, strong anti-interference, and simple and feasible solutions.

Active Publication Date: 2017-08-18
NANJING ELECTRIC POWER ENG DESIGN +2
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  • Abstract
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  • Application Information

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Problems solved by technology

Since the partial discharge signal is a broadband signal from low frequency to high frequency, the positioning error caused by the traditional fixed wave velocity through experience cannot be ignored

Method used

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  • AC cable internal wave velocity characteristic detection method and detection system
  • AC cable internal wave velocity characteristic detection method and detection system
  • AC cable internal wave velocity characteristic detection method and detection system

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Embodiment Construction

[0036] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0037] Such as figure 1 As shown, a system for testing the internal wave velocity characteristics of AC cables based on the frequency sweep method of the present invention includes a frequency sweep signal generator 1, an experimental signal matching impedance 3, a signal transmission line 4, a signal acquisition device 5, a signal adjustment device 6 and a signal processing device9. The signal transmission line 4 adopts a double-shielded coaxial signal transmission line. The signal conditioning device 6 includes an RL filter 7 and a signal amplifier 8 . Frequency sweep signal generator 1 injects frequency sweep signals of different voltage frequencies into the head end of high voltage power cable 2, and transmits signals through a certain length of high voltage power cable 2; two test signals are connected in parallel at both ends of high voltage power cable 2 to...

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Abstract

The invention provides an AC cable internal wave velocity characteristic detection method and detection system. The AC cable internal wave velocity characteristic detection method comprises steps of transmitting a frequency sweep signal to a cable to be detected according a frequency sweep method, respectively collecting a detection signal and a respond signal on two ends of a cable to be detected, successively performing filtering and amplification processing to obtain pre-processing signals of two paths, performing cross Fourier transform processing on two paths of pre-processing signals to obtain a phase difference value of signals of two paths and thus obtaining cable internal wave velocity characteristics of the cable to be detected. The AC cable internal wave velocity characteristic detection method and detection system can perform a research that the transmission velocity of the internal signal of a high voltage power cable with a certain amount of length is changed along the frequency, are simple and feasible, strong in interference resistance and high in sensitivity.

Description

technical field [0001] The invention belongs to the technical field of electrical equipment, and in particular relates to a research method and a test system for the internal wave velocity characteristics of an AC cable based on a frequency sweep method. Background technique [0002] With the rapid development of China's economy, the trend of urban modernization has become more and more obvious. As an important part of urban distribution network, power cables have achieved rapid development, with an average annual growth rate of 35%. Cross-linked polyethylene insulated cables (XLPE cables for short) have gradually replaced oil-filled cables due to their superior electrical properties and mechanical and physical properties, and have become the most widely used cable type. They are currently widely used in power grids with voltage levels of 10-220kV. [0003] Research on the internal characteristics of AC high-voltage cables is becoming more and more important, such as for par...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/12
CPCG01R31/1272Y04S10/52
Inventor 李伯颐崔厚坤苏永亮吴雪张晓枫吴倩任禹丞
Owner NANJING ELECTRIC POWER ENG DESIGN