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Terminal partial discharge monitoring method based on high-frequency electric field change and system thereof

A high-frequency electric field and terminal station technology, applied in electrostatic field measurement, measurement of electrical variables, measurement of electricity, etc., can solve problems such as inability to accurately determine the location of partial discharge points, easy mutual interference in transmission, and difficult cable operation investigation, etc., to achieve early warning The effect is good, the inspection scope is reduced, and the collection accuracy is improved

Active Publication Date: 2021-11-19
DALI POWER SUPPLY BUREAU YUNNAN POWER GRID
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Problems solved by technology

On a three-core cable, because the distance between the cable phase lines is close, and cables of different circuits are often laid nearby, when ultrasonic waves, UHF electromagnetic waves, etc. are used to measure partial discharge of cables, due to the space Strong penetrating ability, easy to interfere with each other in transmission in space, these partial discharge monitoring methods are often unable to accurately determine the location of partial discharge points, causing practical difficulties for cable operation and investigation

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  • Terminal partial discharge monitoring method based on high-frequency electric field change and system thereof
  • Terminal partial discharge monitoring method based on high-frequency electric field change and system thereof
  • Terminal partial discharge monitoring method based on high-frequency electric field change and system thereof

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[0043] The present invention will be further described in detail below in conjunction with the examples.

[0044] Those skilled in the art will understand that the following examples are only for illustrating the present invention and should not be considered as limiting the scope of the present invention. If no specific technique or condition is indicated in the examples, it shall be carried out according to the technique or condition described in the literature in this field or according to the product specification. The materials or equipment used are not indicated by the manufacturer, and they are all conventional products that can be obtained through purchase.

[0045] The electric field distribution of a normal cable terminal is as follows: figure 1 As shown, because of the cable shielding layer, there is no electric field leakage in the cable body, and the electric field lines are evenly distributed from the lower end of the stress cone to the high voltage side.

[00...

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Abstract

The invention relates to a terminal partial discharge monitoring method based on high-frequency electric field change and a system thereof, and belongs to the technical field of partial discharge monitoring. An electric field monitoring device is adopted; the electric field monitoring device comprises a high-frequency voltage sensor and a signal processing device; the method comprises the following steps: making signals acquired by the electric field monitoring device into an electric field distribution matrix, analyzing matrix data, and judging that electric field distribution is abnormal when a mean square error reading of the matrix data is greater than a matrix average value; if the electric field distribution is abnormal, searching historical data of the electric field monitoring device, and comparing the historical data with the historical data to obtain a partial discharge analysis file; making an electric field change trend chart through a partial discharge analysis file; and extracting a maximum change value and a maximum change rate in the electric field change trend chart, when the maximum change value or the maximum change rate is greater than a preset early warning value, performing partial discharge signal early warning, and prompting a cable fault risk. The system is convenient to use, can realize terminal partial discharge monitoring, and is easy to popularize and apply.

Description

technical field [0001] The invention belongs to the technical field of partial discharge monitoring, and in particular relates to a terminal partial discharge monitoring method and system based on high-frequency electric field changes. Background technique [0002] With the gradual expansion of the scale of urbanization in my country and the improvement of urban safety requirements, new overhead lines have not been adopted by modern urban construction, and existing urban overhead lines will gradually be replaced by underground cables, making power cables The application of power cables is more extensive, and the number of power cables is also growing rapidly. With the transformation of urban power grids, more and more power cables have been applied to urban power grids. In recent years, cross-linked polyethylene cables have been increasingly used in power systems due to their advantages of low cost, high reliability, and easy maintenance. widely. However, the actual operati...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/12G01R29/14G01R1/18
CPCG01R31/1272G01R29/14G01R1/18
Inventor 朱道俊李国彬和琨李亚楠李志伟赵中志张国建杨振邦陈海涛
Owner DALI POWER SUPPLY BUREAU YUNNAN POWER GRID
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