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

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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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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