CN-121978466-A - Superconducting transmission line fault detection method based on superconduction and electromagnetic induction

CN121978466ACN 121978466 ACN121978466 ACN 121978466ACN-121978466-A

Abstract

The invention discloses a superconducting transmission line fault detection method based on superconducting and electromagnetic induction, which relates to the technical field of superconducting transmission line fault detection, and comprises the following steps of S10, acquiring magnetic field change time sequences of a target superconducting transmission line at each distribution position point in real time through an electromagnetic induction monitoring device; the method comprises the steps of S20, constructing a reference data matrix, S30, extracting key feature vectors of each end point of a fault position section of a target superconducting transmission line, S40, determining a fault positioning training set of each end point of the fault position section of the target superconducting transmission line, S50, analyzing fault positioning position points of the target superconducting transmission line, S60, predicting real-time fault indexes of the target superconducting transmission line, and S70, carrying out operation and maintenance treatment on the target superconducting transmission line. The invention fully considers the special property of the target superconducting transmission line and overcomes the limitation of the traditional fault detection method in the field of superconducting transmission.

Inventors

LIU YONG
LI JINFENG
Song Daijie
PEI TAO
ZHU CHUANQIANG
SU ZIHAN
PAN TAO

Assignees

日照阳光合源电力工程有限公司
山东华信电气股份有限公司

Dates

Publication Date: 20260505
Application Date: 20260327

Claims (8)

1. The superconducting transmission line fault detection method based on superconducting and electromagnetic induction is characterized by comprising the following steps of: s10, arranging a plurality of electromagnetic induction monitoring devices along the superconducting transmission line, and acquiring magnetic field change time sequences of a target superconducting transmission line at all arrangement position points in real time through the electromagnetic induction monitoring devices when the superconducting transmission line normally operates; s20, integrating magnetic field change time sequences to construct a reference data matrix corresponding to the magnetic field distribution state of the superconducting transmission line in normal operation; S30, analyzing the fault moment of the target superconducting power transmission line, and extracting key feature vectors of all endpoints of the fault position section of the target superconducting power transmission line according to a reference data matrix corresponding to the magnetic field distribution state of the target superconducting power transmission line during fault; s40, determining a fault positioning training set of each end point of the fault position section of the target superconducting transmission line; S50, analyzing fault positioning position points of a target superconducting transmission line; s60, predicting a real-time fault index of the target superconducting transmission line according to the fault type of the target superconducting transmission line at each fault positioning position point; And S70, selecting whether to inform operation and maintenance personnel to operate and maintain the target superconducting transmission line according to the real-time fault index of the target superconducting transmission line.
2. The method for detecting a fault in a superconducting power transmission line based on superconducting and electromagnetic induction according to claim 1, wherein S10 comprises: s101, acquiring an erection track of a target superconducting transmission line, marking a starting end, a line tower and key nodes of the superconducting transmission line on the erection track, wherein the key nodes comprise an inlet and an outlet of a cooling system and a high-current joint, and an electromagnetic induction monitoring device is arranged at a three-dimensional space position corresponding to each marking point on the erection track; S102, acquiring a preset installation interval of the electromagnetic induction monitoring device, and additionally installing the electromagnetic induction monitoring device on an erection track between adjacent marking points according to the preset installation interval if the distance value between the adjacent marking points is larger than the installation interval; S103, acquiring magnetic field change time sequences of the target superconducting transmission line at all installation position points of the electromagnetic induction monitoring device in real time through the electromagnetic induction monitoring device installed on the erection track of the target superconducting transmission line.
3. The method for detecting the fault of the superconducting transmission line based on the superconducting and electromagnetic induction according to claim 2, wherein S20 comprises the steps of obtaining magnetic field change time sequences of the target superconducting transmission line at installation position points of two adjacent electromagnetic induction monitoring devices, calculating a Pearson correlation coefficient between the two magnetic field change time sequences, traversing the magnetic field change time sequences of the installation position points of all the two adjacent electromagnetic induction monitoring devices, and obtaining a reference data matrix corresponding to the magnetic field distribution state of the target superconducting transmission line in normal operation.
4. The method for detecting a fault in a superconducting power transmission line based on superconducting and electromagnetic induction according to claim 3, wherein S30 comprises: S301, calculating cosine similarity between a data matrix corresponding to a real-time magnetic field distribution state of the target superconducting transmission line and a reference data matrix, if the calculated cosine similarity is smaller than a set threshold value, indicating that the target transmission line is faulty at the moment, and if the calculated cosine similarity is larger than or equal to the set threshold value, indicating that the target transmission line is not faulty at the moment: S302, when a fault occurs in the target power transmission line at the moment, performing element-by-element comparison and difference absolute value calculation on a data matrix corresponding to the real-time magnetic field distribution state of the target superconducting power transmission line and a reference data matrix, and preliminarily determining a fault position section of the target superconducting power transmission line based on the relation between the calculated difference absolute value and an error coefficient, wherein the fault position section is used for representing a line section of the target superconducting power transmission line represented by a subscript of an element corresponding to the difference larger than the error coefficient; s303, acquiring magnetic field change time sequences of all endpoints of the target superconducting transmission line in a fault position section, wherein the endpoints of the fault position section represent installation position points of the electromagnetic induction monitoring device, and extracting key feature vectors of all endpoints of the target superconducting transmission line in the fault position section.
5. The method for detecting a fault of a superconducting power transmission line based on superconducting and electromagnetic induction according to claim 4, wherein the step S40 comprises the step of matching a historical key feature vector of each end point of a fault location section of the target superconducting power transmission line with a historical fault type of each end point of the fault location section of the target superconducting power transmission line to obtain a fault location training set of each end point of the fault location section of the target superconducting power transmission line.
6. The method for detecting the fault of the superconducting transmission line based on the superconducting and electromagnetic induction is characterized in that S50 comprises the steps of randomly selecting one endpoint of a fault position section, recording a fault positioning training set of a target superconducting transmission line at the selected endpoint as a selected fault positioning training set, calculating Euclidean distances between each sample in the selected fault positioning training set and real-time key feature vectors of the target superconducting transmission line at the selected endpoint, sorting according to an increasing relation of the Euclidean distances, obtaining m fault positioning training samples with the smallest Euclidean distance, and taking the fault type with highest occurrence frequency in the m fault positioning samples as the fault type of the target superconducting transmission line at the selected endpoint; When the fault type of the target superconducting transmission line at the selected end point is a specific type of fault, the selected end point is taken as a fault positioning position point of the target superconducting transmission line, and when the fault type of the target superconducting transmission line at the selected end point is not a specific type of fault, the selected end point is not taken as the fault positioning position point of the target superconducting transmission line, wherein the specific type of fault comprises overheating, mechanical stress, external strong magnetic field interference or self defect of the target superconducting transmission line.
7. The method for detecting a fault in a superconducting power transmission line based on superconducting and electromagnetic induction according to claim 6, wherein S60 comprises: S601, acquiring three-dimensional coordinates of each fault location position point of a target superconducting transmission line on an erection track, calculating Euclidean distances between two adjacent fault location position points, carrying out summation processing on all the calculated Euclidean distances, calculating a ratio between a summation processing result and the calculated Euclidean distance total number, calculating a standard deviation according to the calculated ratio and the Euclidean distance between the adjacent fault location position points, and calculating a ratio between the standard deviation and the calculated ratio to obtain a discrete index of each fault location position point of the target superconducting transmission line on the erection track; S602, obtaining fault types of the target superconducting power transmission line at fault location points, determining dangerous values corresponding to the fault location points in the target superconducting power transmission line, carrying out summation processing on all the determined dangerous values, and calculating the ratio between the summation processing result and the total number of the fault location points in the target superconducting power transmission line to obtain a dangerous score of the target superconducting power transmission line; constructing a fault grade evaluation model of a target superconducting transmission line , Real-time fault index for a target superconducting transmission line, wherein, Representing the discrete index of each fault location point of the target superconducting transmission line on the erection track, Representing a risk score for the target superconducting transmission line, Expressed in terms of Exponential function of the base and 。
8. The method for detecting the fault of the superconducting transmission line based on the superconducting and electromagnetic induction according to claim 7, wherein the step S70 comprises the steps of comparing a real-time fault index of the target superconducting transmission line with a fault operation and maintenance threshold, notifying an operation and maintenance person to operate and maintain the target superconducting transmission line if the real-time fault index is more than or equal to the fault operation and maintenance threshold, and notifying the operation and maintenance person to operate and maintain the target superconducting transmission line if the real-time fault index is less than the fault operation and maintenance threshold.

Description

Superconducting transmission line fault detection method based on superconduction and electromagnetic induction Technical Field The invention relates to the technical field of superconducting transmission line fault detection, in particular to a superconducting transmission line fault detection method based on superconducting and electromagnetic induction. Background With the continuous rise of energy demand and the increasing demand for power transmission efficiency and stability, superconducting power transmission is becoming a very potential technology. The superconducting transmission line can realize high-capacity and low-loss power transmission by utilizing the characteristics of zero resistance, complete diamagnetism and the like of the superconducting material at low temperature, and effectively solves the problems of energy loss, heating and the like of the traditional transmission line in long-distance and high-capacity transmission. However, compared with the traditional transmission line, the fault detection and positioning of the superconducting transmission line are more complex and challenging, and due to the special physical properties of the superconducting material, the traditional conventional transmission line fault detection method based on resistance, capacitance, inductance change, traveling wave method and the like is difficult to directly apply to the superconducting transmission line, and the fault point cannot be accurately and rapidly detected and positioned. Disclosure of Invention The invention aims to provide a superconducting transmission line fault detection method based on superconducting and electromagnetic induction so as to solve the problems in the prior art. In order to achieve the above purpose, the invention provides a superconducting transmission line fault detection method based on superconducting and electromagnetic induction, which comprises the following steps: s10, arranging a plurality of electromagnetic induction monitoring devices along the superconducting transmission line, and acquiring magnetic field change time sequences of a target superconducting transmission line at all arrangement position points in real time through the electromagnetic induction monitoring devices when the superconducting transmission line normally operates; s20, integrating magnetic field change time sequences to construct a reference data matrix corresponding to the magnetic field distribution state of the superconducting transmission line in normal operation; S30, analyzing the fault moment of the target superconducting power transmission line, and extracting key feature vectors of all endpoints of the fault position section of the target superconducting power transmission line according to a reference data matrix corresponding to the magnetic field distribution state of the target superconducting power transmission line during fault; s40, determining a fault positioning training set of each end point of the fault position section of the target superconducting transmission line; S50, analyzing fault positioning position points of a target superconducting transmission line; s60, predicting a real-time fault index of the target superconducting transmission line according to the fault type of the target superconducting transmission line at each fault positioning position point; And S70, selecting whether to inform operation and maintenance personnel to operate and maintain the target superconducting transmission line according to the real-time fault index of the target superconducting transmission line. Further, the step S10 includes: S101, acquiring an erection track of a target superconducting transmission line, marking a starting end, a line tower and key nodes of the superconducting transmission line on the erection track, wherein the key nodes comprise an inlet and an outlet of a cooling system and a high-current joint, and an electromagnetic induction monitoring device is arranged at a three-dimensional space position corresponding to each marking point on the erection track; the electromagnetic induction monitoring device consists of a high-sensitivity magnetic field sensor (such as a Hall sensor or a fluxgate sensor), a signal conditioning circuit, a microcontroller and a wireless communication module, wherein the magnetic field sensor is used for sensing tiny changes of a magnetic field around a superconducting transmission line in real time and converting the tiny changes into an electric signal; the microcontroller is used for carrying out analog-to-digital conversion and preliminary data processing on the processed electric signals, the preliminary data processing refers to converting the electric signals obtained after the analog-to-digital conversion into magnetic field intensity values and transmitting the data to a data processing center through a wireless communication module, and a communication protocol adopted by the wireless communication module comprises Wi-Fi,