CN-121978486-A - Cable discharge acquisition method and device, terminal equipment and storage medium

CN121978486ACN 121978486 ACN121978486 ACN 121978486ACN-121978486-A

Abstract

The invention discloses a cable discharge acquisition method, a device, terminal equipment and a storage medium, wherein the method comprises the steps of acquiring high-frequency current acquisition data and capacitance acquisition data based on a high-frequency current acquisition channel and a capacitance acquisition channel; the method comprises the steps of obtaining high-frequency current mixing data based on preset high-frequency current local oscillation frequency, high-frequency current local oscillation amplitude and high-frequency current acquisition data, repeatedly executing a high-frequency current mixing data acquisition step until the high-frequency current local oscillation frequency is equal to a preset high-frequency current local oscillation frequency value to obtain a high-frequency current mixing data set, repeatedly executing a capacitance mixing data acquisition step based on preset capacitance local oscillation frequency, capacitance local oscillation amplitude and capacitance acquisition data until the capacitance local oscillation frequency is equal to a preset capacitance local oscillation frequency value to obtain a capacitance mixing data set, selecting a target acquisition channel from the high-frequency current acquisition channel and the capacitance acquisition channel based on the data to acquire discharge information of a cable to be tested through the target acquisition channel, and therefore improving detection efficiency in a partial discharge process.

Inventors

YU SHIHU
LIN GUOHAI
YU XIN
PENG XIANGYANG
GAO JIAN
LI YINGE
FAN YAZHOU
WU JI
WANG ZHENG
ZHAO DONGSHENG

Assignees

广东电网有限责任公司电力科学研究院

Dates

Publication Date: 20260505
Application Date: 20260326

Claims (10)

1. The utility model provides a cable discharge collection method which characterized in that is applied to binary channels multiplex collection system, binary channels multiplex collection system includes high frequency current collection passageway and electric capacity collection passageway, wherein, high frequency current collection passageway and the cable earth wire signal connection of awaiting measuring cable, electric capacity collection passageway and the cable earth wire signal connection of awaiting measuring cable, the method includes: Acquiring high-frequency current acquisition data of the cable to be tested based on the high-frequency current acquisition channel, and acquiring capacitance acquisition data of the cable to be tested based on the capacitance acquisition channel; Repeating the step of obtaining the high-frequency current mixing data based on the preset high-frequency current local oscillation frequency, the preset high-frequency current local oscillation amplitude and the high-frequency current acquisition data until the high-frequency current local oscillation frequency is equal to the preset high-frequency current local oscillation frequency value, so as to obtain a high-frequency current mixing data set; repeating the step of acquiring the capacitance mixing data based on the preset capacitance local oscillation frequency, the preset capacitance local oscillation amplitude and the capacitance acquisition data until the capacitance local oscillation frequency is equal to the preset capacitance local oscillation frequency value, so as to obtain a capacitance mixing data set; Selecting a target acquisition channel from the high-frequency current acquisition channel and the capacitance acquisition channel based on the high-frequency current mixing data set, the high-frequency current local oscillation amplitude, the capacitance mixing data set and the capacitance local oscillation amplitude, so as to acquire discharge information of the cable to be tested through the target acquisition channel; The method comprises the steps of obtaining a preset first frequency value and a first addition sum of the high-frequency current local oscillation frequency every time the high-frequency current frequency mixing data obtaining step is executed, taking the first addition sum as a new high-frequency current local oscillation frequency, obtaining a preset second frequency value and a second addition sum of the capacitor local oscillation frequency every time the capacitor frequency mixing data obtaining step is executed, and taking the second addition sum as the new capacitor local oscillation frequency.
2. The method according to claim 1, wherein the step of obtaining the high-frequency current mixing data is repeatedly performed based on a preset high-frequency current local oscillation frequency, a preset high-frequency current local oscillation amplitude value, and the high-frequency current collection data until the high-frequency current local oscillation frequency is equal to the preset high-frequency current local oscillation frequency value, and the step of obtaining the high-frequency current mixing data includes: Obtaining a high-frequency current local oscillation signal based on the high-frequency current local oscillation frequency and the high-frequency current local oscillation amplitude; and obtaining high-frequency current mixing data based on the high-frequency current local oscillation signal and the high-frequency current acquisition data.
3. The cable discharge acquisition method according to claim 2, wherein the obtaining the high-frequency current local oscillation signal based on the high-frequency current local oscillation frequency and the high-frequency current local oscillation amplitude includes: Acquiring data sensing time of the high-frequency current acquisition data; cosine processing is carried out on the high-frequency current local oscillation frequency and the data sensing time to obtain a high-frequency current local oscillation cosine value; and obtaining the high-frequency current local oscillation signal based on the product of the high-frequency current local oscillation cosine value and the high-frequency current local oscillation amplitude value.
4. The method according to claim 1, wherein the selecting a target acquisition channel from the high-frequency current acquisition channel and the capacitor acquisition channel based on the high-frequency current mixing data set, the high-frequency current local oscillation amplitude, the capacitor mixing data set and the capacitor local oscillation amplitude to acquire the discharge information of the cable to be tested through the target acquisition channel comprises: Obtaining a high-frequency current amplitude set based on the high-frequency current mixing data set and the high-frequency current local oscillation amplitude; selecting the high-frequency current amplitude with the largest value from the high-frequency current amplitude set as the target high-frequency current amplitude; Based on the capacitance mixing data set and the capacitance local oscillation amplitude value, a capacitance amplitude value set is obtained; selecting the capacitance amplitude with the largest value from the capacitance amplitude set as a target capacitance amplitude; And selecting a target acquisition channel from the high-frequency current acquisition channel and the capacitance acquisition channel based on the target high-frequency current amplitude and the target capacitance amplitude so as to acquire discharge information of the cable to be tested through the target acquisition channel.
5. The method of claim 4, wherein the obtaining the set of high-frequency current amplitudes based on the set of high-frequency current mixing data and the high-frequency current local oscillation amplitudes comprises: performing low-pass filtering processing on the high-frequency current mixing data set to obtain a high-frequency current filtering mixing data set; Determining a high-frequency current filtering mixing amplitude set based on the high-frequency current filtering mixing data set; And obtaining a high-frequency current amplitude set based on the high-frequency current filtering mixing amplitude set and the high-frequency current local oscillation amplitude.
6. The method of claim 5, wherein the obtaining the set of high-frequency current amplitudes based on the set of high-frequency current filtering mixing amplitudes and the high-frequency current local oscillation amplitudes comprises: Obtaining a high-frequency current product value based on the product of the high-frequency current local oscillation amplitude and a preset mixing coefficient; And obtaining the high-frequency current amplitude set based on the ratio of the high-frequency current filtering mixing amplitude set to the high-frequency current product value.
7. The method according to claim 4, wherein selecting a target collecting channel from the high-frequency current collecting channel and the capacitor collecting channel based on the target high-frequency current amplitude and the target capacitor amplitude to collect discharge information of the cable to be tested through the target collecting channel comprises: Comparing the target high-frequency current amplitude with the target capacitance amplitude, and taking the high-frequency current acquisition channel as a target acquisition channel when the target high-frequency current amplitude is larger than the target capacitance amplitude; and when the target high-frequency current amplitude is smaller than the target capacitance amplitude, taking the capacitance acquisition channel as a target acquisition channel.
8. The utility model provides a cable discharge collection system, its characterized in that is applied to binary channels multiplex collection system, binary channels multiplex collection system includes high-frequency current collection passageway and electric capacity collection passageway, wherein, high-frequency current collection passageway with the cable earth wire signal connection of cable awaits measuring, electric capacity collection passageway with the cable earth wire signal connection of cable awaits measuring, the device includes: The basic data acquisition module is used for acquiring high-frequency current acquisition data of the cable to be tested based on the high-frequency current acquisition channel and acquiring capacitance acquisition data of the cable to be tested based on the capacitance acquisition channel; the high-frequency current mixing data set acquisition module is used for repeatedly executing the high-frequency current mixing data acquisition step based on the preset high-frequency current local oscillation frequency, the preset high-frequency current local oscillation amplitude and the high-frequency current acquisition data until the high-frequency current local oscillation frequency is equal to the preset high-frequency current local oscillation frequency value to obtain a high-frequency current mixing data set; The capacitance mixing data set acquisition module is used for repeatedly executing the capacitance mixing data acquisition step based on the preset capacitance local oscillation frequency, the preset capacitance local oscillation amplitude and the capacitance acquisition data until the capacitance local oscillation frequency is equal to the preset capacitance local oscillation frequency value to obtain a capacitance mixing data set; The target acquisition channel selection module is used for selecting a target acquisition channel from the high-frequency current acquisition channel and the capacitance acquisition channel based on the high-frequency current mixing data set, the high-frequency current local oscillation amplitude, the capacitance mixing data set and the capacitance local oscillation amplitude so as to acquire discharge information of the cable to be tested through the target acquisition channel; The method comprises the steps of obtaining a preset first frequency value and a first addition sum of the high-frequency current local oscillation frequency every time the high-frequency current frequency mixing data obtaining step is executed, taking the first addition sum as a new high-frequency current local oscillation frequency, obtaining a preset second frequency value and a second addition sum of the capacitor local oscillation frequency every time the capacitor frequency mixing data obtaining step is executed, and taking the second addition sum as the new capacitor local oscillation frequency.
9. A terminal device comprising a processor, a memory and a computer program stored in the memory and configured to be executed by the processor, the processor implementing a cable discharge acquisition method as claimed in any one of claims 1-7 when the computer program is executed.
10. A computer readable storage medium comprising a stored computer program, wherein the computer program, when run, controls a device in which the computer readable storage medium is located to perform a cable discharge acquisition method according to any one of claims 1-7.

Description

Cable discharge acquisition method and device, terminal equipment and storage medium Technical Field The present invention relates to the field of cable discharge acquisition, and in particular, to a cable discharge acquisition method, apparatus, terminal device, and storage medium. Background Along with the advent of the intelligent information age, electric energy has become an indispensable energy source in people's daily life, and the reliability of power supply is related to people's daily life and production life. In urban distribution network systems, power cables of various voltage levels gradually form an intricate distribution network. Power cables belong to the typical capacitive power plant, and local insulation damage will cause failure of the entire insulation system. Therefore, the realization of the state monitoring of cable insulation is a key related to the safe and stable operation of the urban power system. When partial discharge of the cable occurs, various signals are generated, and the generated pulse current signals are often used as key monitoring information of the partial discharge detection technology to determine whether the cable has partial discharge. Currently, the most commonly used sensor for detecting the cable pulse current signal is a high frequency current sensor (HFCT), and because of the parameter limitation of the material, the upper limit of the response frequency of the current HFCT sensor is lower, typically about 50MHz, so when the frequency of the signal generated in the partial discharge is higher, the HFCT cannot be used to obtain accurate partial discharge information. And partial factories and scientific research institutions use the capacitor as detection of discharge pulse signals to construct a capacitive sensor, and the signal detection of 50MHz and above frequency bands is realized by utilizing the better response characteristic of the capacitive sensor in the high frequency band, so that the HFCT and the capacitive sensor are commonly used simultaneously in the prior art. But in this process two separate high-speed sampling and processing channels are typically correspondingly configured. The two-way parallel acquisition and processing architecture can guarantee the detection bandwidth, but the back-end system is inevitably required to synchronously process two paths of high-speed data, and complex signal alignment, fusion and parallel analysis are carried out, so that the data processing burden is heavy, the utilization rate of computing resources is low, the overall response of the system is slow, and the detection flow efficiency is low. Disclosure of Invention The invention provides a cable discharge acquisition method, a device, terminal equipment and a storage medium, which can solve the problems and improve the detection efficiency in the partial discharge process. The invention provides a cable discharge acquisition method, which is applied to a dual-channel multiplexing acquisition system, wherein the dual-channel multiplexing acquisition system comprises a high-frequency current acquisition channel and a capacitance acquisition channel, the high-frequency current acquisition channel is in signal connection with a cable grounding wire of a cable to be tested, the capacitance acquisition channel is in signal connection with the cable grounding wire of the cable to be tested, and the method comprises the following steps: Acquiring high-frequency current acquisition data of the cable to be tested based on the high-frequency current acquisition channel, and acquiring capacitance acquisition data of the cable to be tested based on the capacitance acquisition channel; Repeating the step of obtaining the high-frequency current mixing data based on the preset high-frequency current local oscillation frequency, the preset high-frequency current local oscillation amplitude and the high-frequency current acquisition data until the high-frequency current local oscillation frequency is equal to the preset high-frequency current local oscillation frequency value, so as to obtain a high-frequency current mixing data set; repeating the step of acquiring the capacitance mixing data based on the preset capacitance local oscillation frequency, the preset capacitance local oscillation amplitude and the capacitance acquisition data until the capacitance local oscillation frequency is equal to the preset capacitance local oscillation frequency value, so as to obtain a capacitance mixing data set; Selecting a target acquisition channel from the high-frequency current acquisition channel and the capacitance acquisition channel based on the high-frequency current mixing data set, the high-frequency current local oscillation amplitude, the capacitance mixing data set and the capacitance local oscillation amplitude, so as to acquire discharge information of the cable to be tested through the target acquisition channel; The method comprises the steps of obtaining a prese