Processing method for verifying cable temperature abnormity based on multi-plane hypothesis data

Abstract

The invention discloses a processing method for verifying cable temperature abnormity based on multi-plane hypothesis data. The processing method comprises the following steps: acquiring cable current and temperature monitoring data; performing multi-plane assumption on the cable temperature measurement points; correcting the temperature of a heating point of the cable according to a multi-plane hypothesis; diagnosing the temperature of the cable according to the corrected data; the cable temperature can be monitored in real time through various kinds of temperature monitoring, the temperatures of all positions of the cable are verified and corrected through multi-plane hypothesis, the more accurate cable temperature is obtained, and therefore accurate and rapid detection of cable temperature abnormity is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of substation cable temperature monitoring, and in particular to a processing method for verifying cable temperature anomalies based on multi-plane assumed data. Background Art

[0002] The incoming and outgoing cable lines of low-voltage distribution cabinets are important components of distribution line equipment and also the link for connecting lines and equipment. Their operation directly affects the reliable operation of the entire substation area. If the heat generation information of the cable is not grasped in time, long-term operation will cause insulation damage and phase-to-phase short circuit, leading to cable explosion and combustion. If the fire fighting is not timely, the entire distribution cabinet will be burned, and the power outage area will be small for the customers under the low-voltage circuit and large for all customers in the entire substation area. Currently, the measurement method is adopted during regular inspections or during the annual periodic physical examination of distribution equipment. However, the installation position of the monitoring equipment in the prior art is at a certain distance from the disconnector contact, and it cannot directly reflect the temperature of the heat generation point (usually the contact surface), resulting in a large temperature monitoring error.

[0003] For example, a "Method for Detecting, Processing and Diagnosing Abnormal Heat Generation of Cable Terminals in Operating State" disclosed in a Chinese patent document, with the publication number: CN110045239B, discloses including using a single-chip microcomputer control module to process the temperature data of the cable terminal insulation layer monitored by 8 temperature sensors collected by a temperature signal acquisition system, controlling the operation of 10 cooling fins and an alarm fixed in a temperature control shell; testing the abnormal heat generation situation of the cable terminal; diagnosing the degree of abnormal heat generation of the cable terminal, using the temperature data of 8 temperature sensors within 1 minute of abnormal heat generation of the cable terminal stored in the temperature signal acquisition system, and calculating the abnormal heat generation factor of 8 cable terminal insulation layer test points and the overall heat damage factor of the entire cable terminal; however, this solution does not correct the temperature data generated by the distance between the temperature measurement point and the heat generation point. Summary of the Invention

[0004] In order to solve the problem of lack of temperature data correction in the prior art, the present invention provides a processing method for verifying cable temperature anomalies based on multi-plane assumed data, combines an algorithm model for anomaly judgment, and realizes accurate and rapid detection of cable temperature anomalies.

[0005] To achieve the above object, the present invention provides the following technical solutions: A processing method for verifying cable temperature anomalies based on multi-plane assumed data, comprising the following steps: obtaining cable current and temperature monitoring data; Making multi-plane assumptions about the cable temperature measurement points; Correcting the temperature of the cable heat generation point according to the multi-plane assumptions; Diagnose the cable temperature according to the corrected data. First, measure the temperature of each part of the cable in multiple ways to obtain multiple temperature measurement points. Then, make multi-plane assumptions for multiple cable temperature measurement points, which can verify the temperature of each temperature measurement point, and then determine the heating point and the temperature of the heating point. Then, correct the temperature of the heating point according to the results of the multi-plane assumption to obtain the temperature of the heating point under the combined action of the temperatures detected at multiple locations. Diagnose the corrected temperature of the heating point according to the position and temperature threshold. It is possible to monitor the cable temperature in real time through multiple temperature monitors, verify and correct the temperatures of each part of the cable through multi-plane assumptions, obtain more accurate cable temperatures, and thus achieve accurate and rapid detection of abnormal cable temperatures.

[0006] Preferably, before the multi-plane assumption, the cable is divided into a first temperature and a second temperature. The first temperature is the temperature converted from the cable current; the second temperature is the temperature converted from the temperature monitoring data. The first temperature is the temperature data obtained by collecting indirect variables, and the second temperature is the temperature data obtained by collecting direct variables; the temperature data reflected by the cable working-related characteristics is obtained through the first temperature, and the temperature data of different positions of the cable under different monitoring methods is obtained through the second temperature. After selecting different monitoring methods for the cable heating position according to the heating direction, the temperature data of different planes based on the same heating point can be determined. The changes of different parameters of the same heating point can be determined.

[0007] Preferably, the multi-plane assumption includes dividing the temperature layer. The first temperature and the second temperature are located in different temperature layers, and simulation assumptions are made for each temperature layer respectively to obtain the assumed data of adjacent temperature layers. It is possible to assume and verify the cable temperature in layers. After obtaining the temperature data, analyze the temperature data in layers. At this time, due to the different propagation effects of temperature between different media, the correlation between the existing temperature data is verified through multiple planes. Since the acquisition methods of the first temperature and the second temperature are different, they are divided into different temperature layers for verification. The temperature layer includes a first temperature layer. The first temperature is in the first temperature layer, and the first temperature layer generates a first correction value; the second temperature is in the second temperature layer, and the second temperature layer generates a second correction value. The simulation assumption is to model the temperature model in the plane, deform the temperature model according to the distribution of temperature points, and determine the temperature change influence value based on the deformed temperature model as the simulation model according to the plane assumption, so as to obtain the simulation influence parameters of each layer.

[0008] Preferably, the simulation hypothesis includes making a hypothesis about the authenticity of the temperature data in the current temperature layer within the plane, determining the temperature at each point in the plane through the authenticity hypothesis, and obtaining the hypothesis data by applying a transformation matrix to the determined temperature in the plane. This can convert the cable temperature verification into a plane temperature verification. It includes establishing a temperature model in the plane, deforming the temperature model according to the distribution of temperature points, and assuming that the deformed temperature model does not extend into adjacent temperature layers. At this time, the temperature at the location of each temperature measurement point in this temperature layer is determined, and the temperature exceeding the plane after the deformation of the temperature point at the temperature measurement point in the plane is converted through a temperature propagation matrix to obtain the assumed influence parameter. This influence parameter is the hypothesis data.

[0009] Preferably, the temperature of each layer is corrected according to the hypothesis data, and the temperature correction is verified against the detection data. After successful verification, the temperature correction is completed; if the verification fails, the current temperature correction is rejected. This can correct the temperature obtained at different positions of the cable to obtain the accurate temperature at the heating point. After obtaining the influence parameter, a vector value is assigned to the influence parameter in another temperature layer, and the hypothesis data is corrected according to the vector value and the influence parameter, thereby realizing the correction based on the mutual influence between multiple temperature layers. Additionally, it includes verifying the temperature correction according to the distribution trend of the detected temperature. If the corrected temperature does not conform to the distribution trend, the current correction is rejected. Thus, the true and accurate temperature correction is selected.

[0010] Preferably, it includes determining the cable heating point according to the second temperature, making a threshold judgment on the uncorrected second temperature, and obtaining the position in the temperature layer where the second temperature exceeds the threshold. The cable heating point is determined based on the position in the temperature layer. The cable heating point can be determined according to the hypothesis verification. After obtaining the temperature data from the directly collected variables, the mutation point characteristics of the temperature data are identified and judged in combination with the temperature thresholds set for each position of the cable to obtain the cable heating point.

[0011] Preferably, the second temperature includes the surface detection temperature and the internal detection temperature, and the surface detection temperature and the internal detection temperature are used for simulation hypothesis in different temperature layers. This can separately conduct hypothesis verification on the currents at different positions of the cable. The second temperature layer is divided into a third temperature layer, and the second temperature layer and the third temperature layer divide the cable in space to obtain the temperature layers for temperature measurement at different positions of the cable.

[0012] Preferably, for the current-converted temperature, it includes obtaining the current monitoring data, fitting the current monitoring data with the cable model, and obtaining the first temperature at each position of the cable according to the conversion formula and feature recognition. This can determine the temperature of the cable based on the current of the cable.

[0013] Preferably, the diagnosis of the cable temperature includes setting a temperature threshold for each temperature layer, making a threshold judgment on the corrected temperature, and diagnosing over-temperature when the corrected temperature exceeds the threshold. It can quickly judge the abnormal cable temperature.

[0014] The present invention has the following advantages: (1) It can monitor the cable temperature in real time through multiple temperature monitors, verify and correct the temperature at various positions of the cable through multi-plane assumptions, obtain a more accurate cable temperature, and thus achieve accurate and rapid detection of abnormal cable temperature; (2) It can conduct hypothesis verification on the cable temperature in layers, convert the cable temperature verification into plane temperature verification, and at the same time can correct according to the temperature obtained at different positions of the cable, so as to obtain the accurate temperature at the heat generation point. Description of the Drawings

[0015] The drawings in the following description are only exemplary. For those of ordinary skill in the art, without creative efforts, other implementation drawings can be obtained according to the provided drawings.

[0016] Figure 1 It is a schematic diagram of the steps of a processing method for verifying abnormal cable temperature based on multi-plane hypothesis data in an embodiment.

[0017] Figure 2 It is a schematic diagram of the data processing logic in an embodiment. Detailed Embodiments

[0018] The following specific embodiments illustrate the implementation manners of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0019] As shown in Figure 1, in a preferred embodiment, the present invention discloses a processing method for verifying abnormal cable temperature based on multi-plane hypothesis data, including the following steps: obtaining cable current and temperature monitoring data; Making multi-plane assumptions about the cable temperature measurement points; Correcting the cable heat generation point temperature according to the multi-plane assumptions; The cable temperature is diagnosed based on the corrected data. First, the temperature of each cable is measured in various ways to obtain multiple temperature measurement points. Then, a multi-plane assumption is made for multiple cable temperature measurement points. The temperature of each temperature measurement point can be verified, and then the hot spot and the temperature of the hot spot are determined. Then, the hot spot temperature is corrected based on the result of the multi-plane assumption to obtain the hot spot temperature based on the combined effect of multiple detection temperatures. The corrected hot spot temperature is diagnosed based on the position and temperature threshold. The cable temperature can be monitored in real time through multiple temperature monitoring, and the temperature of each cable can be verified and corrected through multi-plane assumptions to obtain a more accurate cable temperature, thereby achieving accurate and rapid detection of cable temperature anomalies.

[0020] Before the multi-plane assumption, the cable is divided into a first temperature and a second temperature, the first temperature is the cable current conversion temperature; the second temperature is the temperature monitoring data conversion temperature. The first temperature is the temperature data obtained by collecting indirect variables, and the second temperature is the temperature data obtained by collecting direct variables; the temperature data reflected by the working characteristics of the cable is obtained by the first temperature, and the temperature data of different positions of the cable under different monitoring methods is obtained by the second temperature. After selecting different monitoring methods for the heating position of the cable according to the heating direction, the temperature data of different planes based on the same heating point can be determined. The changes of different parameters of the same heating point can be determined.

[0021] In other embodiments, Figure 2 As shown, the multi-plane hypothesis includes dividing the temperature layer, the first temperature and the second temperature are located in different temperature layers, and simulation assumptions are made for each temperature layer to obtain the assumption data of the adjacent temperature layers. The cable temperature can be layered for hypothesis verification. After obtaining the temperature data, the temperature data is layered and analyzed. At this time, due to the different effects of temperature propagation between different media, the correlation between the existing temperature data is verified through multiple planes. Since the first temperature and the second temperature are obtained in different ways, they are divided into different temperature layers for verification. The temperature layer includes a first temperature layer, the first temperature is in the first temperature layer, and the first temperature layer generates a first correction value; the second temperature is in the second temperature layer, and the second temperature layer generates a second correction value. The simulation assumption is to model the temperature model in the plane, deform the temperature model according to the distribution of the temperature points, and determine the temperature change influence value based on the plane assumption with the deformed temperature model as the simulation model, so as to obtain the simulation influence parameter of each layer.

[0022] In another embodiment, the temperature data of each temperature layer is acquired using different detection methods, which can realize multiple methods of detecting the cable temperature and obtain more accurate measurement results in different cable arrangements and different locations.

[0023] The temperature on the surface of the cable is measured in a non-contact manner, the temperature inside the cable is measured using sensors, and parameters such as current are measured separately.

[0024] In other embodiments, the simulation assumptions include making an in-plane authenticity assumption for the temperature data of this temperature layer, determining the temperature at each point in the plane through the authenticity assumption, and obtaining the assumed data from the determined in-plane temperature through a transformation matrix. It is possible to convert the cable temperature verification into a plane temperature verification. This includes establishing a temperature model in the plane, deforming the temperature model according to the distribution of temperature points, and assuming that the deformed temperature model will not cross into adjacent temperature layers. At this time, the temperature at the location of each temperature measurement point in this temperature layer is determined, and the temperature of the temperature points that exceed the plane after deformation at the temperature measurement points in the plane is transformed through a temperature propagation matrix to obtain the assumed influence parameter. This influence parameter is the assumed data.

[0025] In other embodiments, the temperature of each layer is corrected according to the assumed data, and the temperature correction is verified based on the detection data. After successful verification, the temperature correction is completed. If the verification fails, this temperature correction is rejected. It is possible to correct the temperature obtained at different positions of the cable to obtain the accurate temperature at the heat generation point. After obtaining the influence parameter, a vector value is assigned to the influence parameter in another temperature layer, and the assumed data is corrected according to the vector value and the influence parameter, thereby realizing the correction based on the mutual influence between multiple temperature layers. Additionally, it includes verifying the temperature correction according to the distribution trend of the detected temperature. If the corrected temperature does not conform to the distribution trend, this correction is rejected. Thus, the true and accurate temperature correction is screened out.

[0026] In other embodiments, it includes determining the cable heat generation point according to the second temperature, making a threshold judgment on the uncorrected second temperature, and obtaining the position in the temperature layer where the second temperature exceeds the threshold. The cable heat generation point is determined according to the position in the temperature layer. It is possible to determine the cable heat generation point based on the hypothesis verification. After obtaining the temperature data from the directly collected variables, the mutation point characteristics of the temperature data are identified, and a judgment is made in combination with the temperature thresholds set for each position of the cable to obtain the cable heat generation point.

[0027] The second temperature includes the surface detection temperature and the internal detection temperature, and the surface detection temperature and the internal detection temperature are used for simulation assumptions in different temperature layers. It is possible to separately make hypothesis verifications for the currents at different positions of the cable.

[0028] The current-converted temperature includes obtaining current monitoring data, fitting the current monitoring data with the cable model, and obtaining the first temperature at each position of the cable according to the conversion formula and feature recognition. It is possible to determine the temperature of the cable based on the current of the cable.

[0029] The diagnosis of the cable temperature includes setting the temperature threshold for each temperature layer, judging the threshold of the corrected temperature, and diagnosing over-temperature when the corrected temperature exceeds the threshold. It can quickly judge the abnormal cable temperature.

[0030] In another embodiment, it includes a computing cloud. The cable temperature data at different positions are all uploaded to the computing cloud for hypothesis verification. After diagnosing over-temperature, the computing cloud binds the over-temperature data and the corresponding cable position into a data chain and reports it. Thus, the intelligent diagnosis and reporting of cable temperature monitoring are realized.

[0031] Although the present invention has been described in detail with general descriptions and specific embodiments above, on the basis of the present invention, some modifications or improvements can be made, which are obvious to those skilled in the art. Therefore, these modifications or improvements made without departing from the spirit of the present invention all fall within the scope of protection required by the present invention.

Claims

1. A processing method for verifying cable temperature anomalies based on multi-plane hypothesis data, characterized in that, It includes the following steps: obtaining cable current and temperature monitoring data; making multi-plane assumptions for the cable temperature measurement points; correcting the temperature of the cable heating points according to the multi-plane assumptions; diagnosing the cable temperature according to the corrected data.

2. The processing method for verifying abnormal cable temperature based on multi-plane hypothesis data according to claim 1, wherein Before the multi-plane assumptions, the cable is divided into a first temperature and a second temperature. The first temperature is the temperature converted from the cable current; the second temperature is the temperature converted from the temperature monitoring data.

3. The processing method for verifying cable temperature anomalies based on multi-plane hypothesis data according to claim 2, wherein, The multi-plane assumptions include dividing temperature layers. The first temperature and the second temperature are in different temperature layers, and simulation assumptions are made for each temperature layer respectively to obtain the assumed data of adjacent temperature layers.

4. A method for processing cable temperature anomalies based on multi-plane hypothesis data verification according to claim 3, characterized in that, The simulation assumptions include making authenticity assumptions within the plane for the temperature data of this temperature layer, determining the temperature at each location within the plane through the authenticity assumptions, and obtaining the assumed data by using the conversion matrix for the determined temperature within the plane.

5. The processing method for verifying cable temperature anomalies based on multi-plane hypothesis data according to claim 4, characterized in that Temperature correction is performed on the temperature data of each layer according to the assumed data, and the temperature correction is verified according to the detection data. After the verification is correct, the temperature correction is completed. If the verification fails, this temperature correction is rejected.

6. A method for processing cable temperature anomalies based on multi-plane hypothesis data verification according to claim 3 or 4 or 5, characterized in that It includes determining the cable heating points according to the second temperature, making a threshold judgment on the uncorrected second temperature, obtaining the position in the temperature layer where the second temperature exceeds the threshold, and determining the cable heating points according to the position in the temperature layer.

7. A method for processing cable temperature anomaly verification based on multi-plane hypothesis data according to claim 3 or 4 or 5, characterized in that The second temperature includes the surface detection temperature and the internal detection temperature, and simulation assumptions are made for the surface detection temperature and the internal detection temperature in different temperature layers.

8. A method for processing cable temperature anomaly verification based on multi-plane hypothesis data according to claim 6, characterized in that The temperature converted from the current includes obtaining the current monitoring data, fitting the current monitoring data with the cable model, and obtaining the first temperature at each position of the cable according to the conversion formula and feature recognition.

9. A processing method for verifying cable temperature anomalies based on multi-plane hypothesis data according to claim 7, characterized in that, The diagnosis of the cable temperature includes setting the temperature threshold for each temperature layer, making a threshold judgment on the corrected temperature, and diagnosing over-temperature when the corrected temperature exceeds the threshold.

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