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Test method for acquiring high-frequency response of cable

A high-frequency response and test method technology, applied in the measurement of electrical variables, dielectric strength, current/voltage measurement, etc., can solve the problems of difficulty in guaranteeing accuracy and reliability, lack of actual measurement, etc., and improve the reliability of field operation. properties, avoid refracted radiation and waveform distortion, and avoid the effect of being in an overvoltage environment

Pending Publication Date: 2022-04-05
POWERCHINA HEBEI ELECTRIC POWER SURVEY & DESIGN INST CO LTD
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Problems solved by technology

In the calculation of overvoltage, cable calculation has always been a difficult problem. Although there are many models, due to the lack of actual measurement and the parameters quoted from foreign literature, its accuracy and reliability are difficult to guarantee

Method used

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  • Test method for acquiring high-frequency response of cable
  • Test method for acquiring high-frequency response of cable
  • Test method for acquiring high-frequency response of cable

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Embodiment Construction

[0030] Below in conjunction with embodiment the present invention is described in further detail:

[0031] A test method for obtaining the high-frequency response of the cable. A steep pulse signal with a steep rising edge is input at the head end of the cable. To avoid signal reflection, a matching device is connected at both ends of the cable, and the overvoltage is measured by a high-frequency voltage measuring device. For measurement, the response characteristics of the long-distance cable can be obtained by comparing the input and output signals; finally, based on the response characteristics of the long-distance cable test results, the ATP-EMTP cable line module is written to calculate the overvoltage of the high-voltage cable line and improve the accuracy of the model.

[0032] 1) Steep pulse source design

[0033] Based on the high-frequency power electronic switch to form a steep pulse source, the proposed high-voltage circuit design is as follows figure 1 Shown:

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Abstract

The invention discloses a test method for acquiring high-frequency response of a cable, which comprises the following steps of: inputting a steep pulse signal with a steep rising edge at the head end of the cable, connecting a matching device at the head end and the tail end of the cable in order to avoid signal reflection, and measuring overvoltage by using a high-frequency voltage measuring device; the response characteristic of the long-distance cable can be obtained by comparing the input signal and the output signal; finally, an ATP-EMTP cable line module is written based on response characteristics of a long-distance cable test result, and high-voltage cable line overvoltage is calculated, waveform distortion of a high-frequency signal in the cable propagation process is solved, cable overvoltage calculation precision is improved, the situation that the cable put into operation is in an overvoltage environment is avoided, and the reliability of the cable put into operation is improved. And the field operation reliability of the commissioned cable is improved.

Description

technical field [0001] The invention relates to a test method for obtaining high-frequency response of cables, which belongs to the field of cables. Background technique [0002] Due to the complex structure of cable joints, on-site installation is required, and many cable line faults that have occurred in recent years are mainly cable joint faults. In order to solve this problem, in the prior art, it is considered to increase the length of the cable section, thereby reducing the number of joints, but this will lead to changes in the parameters of the existing overvoltage simulation calculation model. In the calculation of overvoltage, cable calculation has always been a difficult problem. Although there are many models, its accuracy and reliability are difficult to guarantee due to the lack of actual measurement and the parameters quoted from foreign literature. The research on the high-frequency response characteristics of high-voltage cable overvoltage signals requires t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08G01R31/12G01R19/165
Inventor 张雯刘哲
Owner POWERCHINA HEBEI ELECTRIC POWER SURVEY & DESIGN INST CO LTD
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