CN116577698A - Substation ground fault monitoring method based on electromagnetic field distribution - Google Patents
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/08—Measuring electromagnetic field characteristics
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/62—Testing of transformers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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Abstract
The application discloses a substation ground fault monitoring method based on electromagnetic field distribution, which comprises the following steps: the method comprises the steps of obtaining the geographic position of a transformer in a power substation, and dividing the area of the power substation into a plurality of observation areas; calculating a fault influence coefficient of the transformer; selecting a plurality of target transformers according to the fault influence coefficient, and respectively performing electromagnetic field intensity simulation of a normal operation state and electromagnetic field intensity simulation of a ground fault state on each target transformer to obtain a magnetic field distribution result; dividing a monitoring area of the ground fault according to a magnetic field distribution result, and setting a lowest electromagnetic field intensity threshold value; and monitoring the electromagnetic field intensity of the target transformer in real time in the monitoring area, and sending out a ground fault early warning signal when the electromagnetic field intensity of the target transformer is lower than a minimum electromagnetic field intensity threshold value. The application overcomes the hysteresis defect of the traditional ground fault monitoring method, shortens the response time for coping with the ground fault and maintains the stability of normal operation of the transformer substation.
Description
Technical Field
The application relates to the technical field of ground fault monitoring, in particular to a substation ground fault monitoring method based on electromagnetic field distribution.
Background
In engineering construction of railway projects, it is generally necessary to construct a plurality of transformers of different capacity levels and substations made up of other electric power devices, and these transformers are generally electrically connected to other related electric power devices through a substation, thereby making up the substation. In an actual engineering application environment, the ground fault is taken as one of main faults of a substation, and how to timely and accurately realize the ground fault monitoring plays a vital role in normal operation of electrical equipment of railway projects. The on-line identification and monitoring of the grounding faults of the substation resistor can be performed, timely early warning and timely processing can be timely found, so that fault hidden danger is eliminated, and power failure accidents are reduced. The accurate and effective monitoring mode can advance the processing of the ground fault to the stage of online monitoring and early warning, effectively improve the prevention capability of the fault and reduce the occurrence probability of the fault.
The traditional ground fault monitoring generally needs to set corresponding ground fault monitoring circuits or equipment on each transformer, and the traditional monitoring mode can only respond at the moment when the ground fault occurs, has certain hysteresis, and causes that the transformer substation can suffer certain loss due to the ground fault, so that the timely response efficiency of the ground fault of the transformer substation is affected.
Disclosure of Invention
Aiming at least one defect or improvement requirement of the prior art, the application provides the substation ground fault monitoring method based on electromagnetic field distribution, which can judge the occurrence of the ground fault in advance, overcomes the hysteresis defect of the traditional ground fault monitoring method, shortens the response time for coping with the ground fault, can know the possibility of the ground fault in advance to a certain extent, and further maintains the stability of normal operation of the substation.
To achieve the above object, according to a first aspect of the present application, there is provided a method for monitoring a ground fault of a substation based on electromagnetic field distribution, the method comprising the steps of:
the method comprises the steps of obtaining the geographic position of each transformer in a power substation, and dividing the area of the power substation into a plurality of observation areas according to the distribution density of the geographic positions of the transformers;
respectively acquiring topological structures of the transformers and the high-voltage cables in each observation area, historical fault grounding records of the transformers and parameters of the transformers, and calculating fault influence coefficients of the transformers;
selecting a plurality of target transformers according to the fault influence coefficient, and respectively performing electromagnetic field intensity simulation of a normal operation state and electromagnetic field intensity simulation of a ground fault state on each target transformer to obtain a magnetic field distribution result of an observation area in the normal operation state and a magnetic field distribution result of the observation area in the ground fault state;
dividing a monitoring area of the ground fault according to the magnetic field distribution result of the observation area in the running state and the magnetic field distribution result of the observation area in the ground fault state, and setting a lowest electromagnetic field intensity threshold value;
and monitoring the electromagnetic field intensity of the target transformer in real time in the monitoring area, and sending out a ground fault early warning signal when the electromagnetic field intensity of the target transformer is lower than a minimum electromagnetic field intensity threshold value.
Further, in the above method for monitoring a ground fault of a power substation based on electromagnetic field distribution, the obtaining the geographical position of each transformer in the power substation divides the area of the power substation into a plurality of observation areas according to the geographical position distribution density of the transformers, specifically includes:
the method comprises the steps of obtaining the geographic position of each transformer in a substation, and dividing the transformers into a plurality of clustering clusters through a density clustering algorithm;
generating curve families of a plurality of cluster clusters respectively, generating corresponding envelope curves based on each curve family, and dividing the area within the envelope curves into observation areas of the substation.
Further, in the above method for monitoring a ground fault of a power substation based on electromagnetic field distribution, the obtaining the geographic position of each transformer in the power substation divides the transformers into a plurality of cluster clusters through a density clustering algorithm specifically includes:
obtaining geographic coordinates of each transformer in a substation, and randomly selecting any coordinate point of the transformer;
presetting a radius neighborhood and a density threshold of a cluster, taking the transformer coordinate point as a core point, and finding out all transformer coordinate points with the density reaching the core point to form a cluster;
and re-selecting the core points from the coordinate points outside the cluster, and repeating the steps until the coordinate points which can be used as the core points are not available.
Further, the method for monitoring the grounding fault of the substation based on electromagnetic field distribution, wherein the calculating the fault influence coefficient of the transformer specifically comprises the following steps:
determining the adjacent quantity of the power equipment connected by each transformer through the high-voltage cable according to the topological structure of the transformer and the high-voltage cable in each observation area;
and taking the adjacent quantity and the historical ground fault record of the transformer and the transformer capacity parameter as fault influence indexes, and carrying out weighted calculation to obtain the fault influence coefficient of the transformer.
Further, in the substation ground fault monitoring method based on electromagnetic field distribution, the historical ground fault record includes: the total number of low-voltage side single-phase earth faults, low-voltage side two-phase earth faults, high-voltage side single-phase earth faults and high-voltage side two-phase earth faults of the transformer occur in a preset history period.
Further, in the above method for monitoring a ground fault of a substation based on electromagnetic field distribution, the selecting a plurality of target transformers according to the fault influence coefficient is as follows:
and arranging the fault influence coefficients of the transformers in the observation area in sequence from large to small, and selecting a plurality of target transformers with larger fault influence coefficients according to preset proportion.
Further, in the substation grounding fault monitoring method based on electromagnetic field distribution, electromagnetic field intensity simulation in the normal operation state and electromagnetic field intensity simulation in the grounding fault state are performed through a power frequency magnetic field finite element algorithm, and an electromagnetic field intensity distribution cloud image in the normal operation state and an electromagnetic field intensity distribution cloud image in the grounding fault state are generated according to a magnetic field distribution result of an observation area in the normal operation state and a magnetic field distribution result of the observation area in the grounding fault state respectively.
Further, the method for monitoring the grounding fault of the substation based on the electromagnetic field distribution comprises the steps of determining a first closed boundary of a lowest electromagnetic field intensity threshold in an electromagnetic field intensity distribution cloud picture of the normal operation state; determining a second closed boundary of a lowest electromagnetic field intensity threshold in the ground fault state electromagnetic field intensity distribution cloud picture;
and taking the area outside the first closed dividing line and inside the second dividing line as a monitoring area.
Further, in the method for monitoring the grounding fault of the substation based on the electromagnetic field distribution, the arrangement mode of the transformer in the substation comprises naked arrangement and closed arrangement;
further, in the above method for monitoring a ground fault of a power substation based on electromagnetic field distribution, when the transformer is arranged in a bare way in the power substation, the electromagnetic field intensity simulation range is as follows: the method comprises the steps of taking an exposed bus as a radiation center, and taking first lengths of a plurality of radiation points on the exposed bus as a radius to form a region;
when the transformer is arranged in a closed mode in the substation, the simulation range of the electromagnetic field intensity is as follows: and taking the closed steel plate shell as a radiation center, and taking a second length which is away from a plurality of radiation points on the closed steel plate shell as an area with a radius.
In general, the above technical solutions conceived by the present application, compared with the prior art, enable the following beneficial effects to be obtained:
according to the substation grounding fault monitoring method based on electromagnetic field distribution, electromagnetic field intensity simulation of a normal operation state and electromagnetic field intensity simulation of a grounding fault state are respectively carried out on a transformer, a magnetic field distribution result of an observation area in the normal operation state and a magnetic field distribution result of the observation area in the grounding fault state are obtained, a lowest electromagnetic field intensity threshold value is set according to the magnetic field distribution result, the substation is monitored in a region division mode, and when the surrounding electromagnetic field intensity of the transformer in the monitoring area is lower than the lowest electromagnetic field intensity threshold value, grounding fault early warning signals can be sent out. The application can pre-judge the occurrence of the ground fault, overcomes the hysteresis defect of the traditional ground fault monitoring method, and enables the related maintainers to respond to the ground fault possibly occurring in the transformer substation in advance, thereby shortening the response time for coping with the ground fault, and knowing the possibility of the ground fault in advance to a certain extent, and further maintaining the stability of normal operation of the transformer substation.
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In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic flow chart of a method for detecting a ground fault of a substation based on electromagnetic field distribution according to an embodiment of the present application.
Detailed Description
The present application will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present application more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application. In addition, the technical features of the embodiments of the present application described below may be combined with each other as long as they do not collide with each other.
The terms first, second, third and the like in the description and in the claims and in the above drawings, are used for distinguishing between different objects and not necessarily for describing a particular sequential or chronological order. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those listed steps or elements but may include other steps or elements not listed or inherent to such process, method, article, or apparatus.
The application provides a substation ground fault monitoring method based on electromagnetic field distribution, and fig. 1 is a flow diagram of a high-voltage cable ground fault detection method based on electromagnetic field distribution. Referring to fig. 1, the method includes the steps of:
(1) The method comprises the steps of obtaining the geographic positions of all transformers in a power substation, and dividing the area of the power substation into a plurality of observation areas according to the distribution density of the geographic positions of the transformers.
Specifically, geographic coordinates of each voltage in the substation are obtained, and the transformer is divided into a plurality of clustering clusters through a density clustering algorithm. In a specific embodiment, the density clustering algorithm adopts a DBSCAN algorithm, the DBSCAN algorithm queries the neighborhood density of a given radius by arbitrarily selecting a certain data object in the data set, if the neighborhood density exceeds a given threshold value, the neighborhood density is defined as a cluster, the same density calculation is carried out on the neighborhood data object, and then the cluster expansion and the combination are carried out.
The specific method comprises the following steps: randomly selecting any coordinate point of a transformer, presetting a radius neighborhood and a density threshold of a cluster, taking the transformer coordinate point as a core point, and finding out all transformer coordinate points with the density reaching the core point to form the cluster; the density is reachable, namely that the selected transformer coordinate point is in the radius neighborhood of the core point, and the neighborhood density does not exceed the density threshold. And re-selecting core points from the transformer coordinate points outside the cluster clusters, and repeating the steps until the transformer coordinate points which can be used as the core points are not available, thereby obtaining a plurality of cluster clusters.
And respectively generating curve clusters of a plurality of cluster clusters, generating corresponding envelope lines based on each curve cluster, and dividing the area within the envelope lines into observation areas of the substation.
In an electric power system, when a certain transformer has a ground fault, the larger the distribution density of the transformer is, the larger the fluctuation of the electromagnetic field intensity between each other is. Based on the distribution density of each transformer in the substation, the transformer is divided into a plurality of cluster groups, the distribution of electromagnetic field intensity is information by taking the cluster groups as units, and then even if the occurrence of ground faults in the cluster groups occurs through the change of the electromagnetic field intensity. The method takes the clustering cluster as a unit to analyze, so that the occurrence range and the influence range of the ground faults can be reduced rapidly, and the ground fault occurrence condition of the transformers with the closer distance can be reflected through the peripheral electromagnetic field change of one transformer.
(2) And respectively acquiring topological structures of the transformer and the high-voltage cable in each observation area, historical fault grounding records of the transformer and transformer parameters, and calculating fault influence coefficients of the transformer.
Specifically, determining the adjacent number of the power equipment connected by each transformer through the high-voltage cable according to the topological structure of the transformers and the high-voltage cable in each observation area; and taking the adjacent quantity and the historical ground fault record of the transformer and the transformer capacity parameter as fault influence indexes, and carrying out weighted calculation to obtain the fault influence coefficient of the transformer. The historical ground fault record comprises the total times of occurrence of single-phase ground faults of the low-voltage side, two-phase ground faults of the low-voltage side, single-phase ground faults of the high-voltage side and two-phase ground faults of the high-voltage side of the transformer in a preset historical period.
(3) And selecting a plurality of target transformers according to the fault influence coefficient, and respectively performing electromagnetic field intensity simulation of a normal operation state and electromagnetic field intensity simulation of a ground fault state on each target transformer to obtain a magnetic field distribution result of an observation area in the normal operation state and a magnetic field distribution result of the observation area in the ground fault state.
Specifically, the calculated fault coefficients of the transformers are arranged in sequence from large to small, and the transformers with large fault influence coefficients represent that the probability of the occurrence of the ground faults is larger, so that a plurality of transformers with larger fault coefficients are extracted in a certain proportion to serve as target transformers for monitoring.
Further, electromagnetic field intensity simulation of a normal operation state and electromagnetic field intensity simulation of a ground fault state are performed through a power frequency magnetic field finite element algorithm, and an electromagnetic field intensity distribution cloud image of the normal operation state and an electromagnetic field intensity distribution cloud image of the ground fault state are generated according to a magnetic field distribution result of an observation area in the normal operation state and a magnetic field distribution result of the observation area in the ground fault state respectively. The operation parameters of electromagnetic field intensity simulation comprise the capacity of the transformer, the rated current of the high-voltage side, the rated current of the low-voltage side, the fault phase current of the high-voltage side, the fault phase current of the low-voltage side and the arrangement mode of a transformer substation where the transformer is located.
The arrangement mode of the transformer in the substation comprises naked arrangement and closed arrangement. When the transformer is arranged in a power substation in a naked way, the simulation range of the electromagnetic field intensity is as follows: the method comprises the steps of taking an exposed bus as a radiation center, and taking first lengths of a plurality of radiation points on the exposed bus as a radius to form a region; when the transformer is arranged in a closed mode in the substation, the simulation range of the electromagnetic field intensity is as follows: and taking the closed steel plate shell as a radiation center, and taking a second length which is away from a plurality of radiation points on the closed steel plate shell as an area with a radius.
In the embodiment, simulation of electromagnetic field distribution around the transformer substation is realized through COMSOL software, the COMSOL software can simulate electromagnetic field intensity in a finite element simulation mode, and the basic idea of a finite element method is as follows: the method comprises the steps of converting a constant solution problem described by a partial differential equation into a variation problem or a weighted margin equation, discretizing the variation problem into an extremum problem of a multi-element function or directly expanding the weighted margin equation by utilizing subdivision interpolation to form an algebraic equation set, and then solving the equation set to obtain an approximate solution of an edge value problem. The embodiment utilizes COMSOL software to carry out simulation analysis on the power frequency electromagnetic field radiation of the railway substation, and comprises main parts of pretreatment, loading and solving, general post-treatment and the like to carry out stage division on the whole simulation process. The preprocessing refers to the early-stage preparation work of finite element simulation, and mainly comprises the establishment of a simulation model, the setting of model material parameters, the selection of solving of problem boundary conditions and grid subdivision; the loading and solving setting is to select the setting of solving frequency, solving step length, solving precision and the like for the established model; post-processing refers to data processing and the finite element computation results are typically presented in the form of cloud graphics or the like.
(4) And dividing a monitoring area of the ground fault according to the magnetic field distribution result of the observation area in the running state and the magnetic field distribution result of the observation area in the ground fault state, and setting a lowest electromagnetic field intensity threshold value.
Specifically, a first closed boundary of a lowest electromagnetic field intensity threshold value is determined in an electromagnetic field intensity distribution cloud picture in a normal operation state; determining a second closed boundary of a lowest electromagnetic field intensity threshold in the ground fault state electromagnetic field intensity distribution cloud picture; and taking the area outside the first closed dividing line and inside the second dividing line as a monitoring area of the ground fault.
(5) And monitoring the electromagnetic field intensity of the target transformer in real time in the monitoring area, and sending out a ground fault early warning signal when the electromagnetic field intensity of the target transformer is lower than a minimum electromagnetic field intensity threshold value.
It should be noted that, for simplicity of description, the foregoing method embodiments are all described as a series of acts, but it should be understood by those skilled in the art that the present application is not limited by the order of acts described, as some steps may be performed in other orders or concurrently in accordance with the present application. Further, those skilled in the art will also appreciate that the embodiments described in the specification are all preferred embodiments, and that the acts and modules referred to are not necessarily required for the present application.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and for parts of one embodiment that are not described in detail, reference may be made to related descriptions of other embodiments.
The foregoing is merely exemplary embodiments of the present disclosure and is not intended to limit the scope of the present disclosure. That is, equivalent changes and modifications are contemplated by the teachings of this disclosure, which fall within the scope of the present disclosure. Embodiments of the present disclosure will be readily apparent to those skilled in the art from consideration of the specification and practice of the disclosure herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a scope and spirit of the disclosure being indicated by the claims.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
It will be readily appreciated by those skilled in the art that the foregoing description is merely a preferred embodiment of the application and is not intended to limit the application, but any modifications, equivalents, improvements or alternatives falling within the spirit and principles of the application are intended to be included within the scope of the application.
Claims (10)
1. The utility model provides a substation ground fault monitoring method based on electromagnetic field distribution which is characterized in that the method comprises the following steps:
the method comprises the steps of obtaining the geographic position of each transformer in a power substation, and dividing the area of the power substation into a plurality of observation areas according to the distribution density of the geographic positions of the transformers;
respectively acquiring topological structures of the transformers and the high-voltage cables in each observation area, historical fault grounding records of the transformers and parameters of the transformers, and calculating fault influence coefficients of the transformers;
selecting a plurality of target transformers according to the fault influence coefficient, and respectively performing electromagnetic field intensity simulation of a normal operation state and electromagnetic field intensity simulation of a ground fault state on each target transformer to obtain a magnetic field distribution result of an observation area in the normal operation state and a magnetic field distribution result of the observation area in the ground fault state;
dividing a monitoring area of the ground fault according to the magnetic field distribution result of the observation area in the running state and the magnetic field distribution result of the observation area in the ground fault state, and setting a lowest electromagnetic field intensity threshold value;
and monitoring the electromagnetic field intensity of the target transformer in real time in the monitoring area, and sending out a ground fault early warning signal when the electromagnetic field intensity of the target transformer is lower than a minimum electromagnetic field intensity threshold value.
2. The method for monitoring the ground fault of the power substation based on the electromagnetic field distribution as claimed in claim 1, wherein the step of obtaining the geographical position of each transformer in the power substation and dividing the area of the power substation into a plurality of observation areas according to the geographical position distribution density of the transformers specifically comprises the steps of:
the method comprises the steps of obtaining the geographic position of each transformer in a substation, and dividing the transformers into a plurality of clustering clusters through a density clustering algorithm;
generating curve families of a plurality of cluster clusters respectively, generating corresponding envelope curves based on each curve family, and dividing the area within the envelope curves into observation areas of the substation.
3. The method for monitoring the ground fault of the substation based on the electromagnetic field distribution according to claim 2, wherein the step of obtaining the geographic position of each transformer in the substation, and dividing the transformers into a plurality of cluster clusters through a density clustering algorithm, specifically comprises the steps of:
obtaining geographic coordinates of each transformer in a substation, and randomly selecting any coordinate point of the transformer;
presetting a radius neighborhood and a density threshold of a cluster, taking the transformer coordinate point as a core point, and finding out all transformer coordinate points with the density reaching the core point to form a cluster;
and re-selecting the core points from the coordinate points outside the cluster, and repeating the steps until the coordinate points which can be used as the core points are not available.
4. The method for monitoring the ground fault of the power substation based on the electromagnetic field distribution as claimed in claim 1, wherein the calculating the fault influence coefficient of the transformer specifically comprises:
determining the adjacent quantity of the power equipment connected by each transformer through the high-voltage cable according to the topological structure of the transformer and the high-voltage cable in each observation area;
and taking the adjacent quantity and the historical ground fault record of the transformer and the transformer capacity parameter as fault influence indexes, and carrying out weighted calculation to obtain the fault influence coefficient of the transformer.
5. A substation ground fault monitoring method based on electromagnetic field distribution as in claim 4, wherein said historical ground fault record comprises: the total number of low-voltage side single-phase earth faults, low-voltage side two-phase earth faults, high-voltage side single-phase earth faults and high-voltage side two-phase earth faults of the transformer occur in a preset history period.
6. The method for monitoring ground faults of a power substation based on electromagnetic field distribution as claimed in claim 1, wherein the selecting a plurality of target transformers according to the fault influence coefficient is as follows:
and arranging the fault influence coefficients of the transformers in the observation area in sequence from large to small, and selecting a plurality of target transformers with larger fault influence coefficients according to preset proportion.
7. The electromagnetic field distribution-based substation ground fault monitoring method as claimed in claim 1, wherein the electromagnetic field intensity simulation of the normal operation state and the electromagnetic field intensity simulation of the ground fault state are performed by a power frequency magnetic field finite element algorithm, and an electromagnetic field intensity distribution cloud image of the normal operation state and an electromagnetic field intensity distribution cloud image of the ground fault state are generated according to a magnetic field distribution result of the observation area in the normal operation state and a magnetic field distribution result of the observation area in the ground fault state, respectively.
8. The electromagnetic field distribution based substation ground fault monitoring method as in claim 7, wherein a first closed boundary of a lowest electromagnetic field intensity threshold is determined in the electromagnetic field intensity distribution cloud for the normal operating state; determining a second closed boundary of a lowest electromagnetic field intensity threshold in the ground fault state electromagnetic field intensity distribution cloud picture;
and taking the area outside the first closed dividing line and inside the second dividing line as a monitoring area.
9. The method for monitoring the ground fault of the power substation based on the electromagnetic field distribution as claimed in claim 1, wherein the arrangement mode of the transformer in the power substation comprises naked arrangement and closed arrangement.
10. The method for monitoring ground faults of a power substation based on electromagnetic field distribution as claimed in claim 9, wherein when the arrangement mode of the transformer at the power substation is naked arrangement, the electromagnetic field intensity simulation range is as follows: the method comprises the steps of taking an exposed bus as a radiation center, and taking first lengths of a plurality of radiation points on the exposed bus as a radius to form a region;
when the transformer is arranged in a closed mode in the substation, the simulation range of the electromagnetic field intensity is as follows: and taking the closed steel plate shell as a radiation center, and taking a second length which is away from a plurality of radiation points on the closed steel plate shell as an area with a radius.
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| CN117849498A (en) * | 2023-12-27 | 2024-04-09 | 慧之安信息技术股份有限公司 | Power grid transformer defect detection method and system based on multi-target identification |
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