CN113125897A - Memory, overhead line single-phase earth fault detection method, system and equipment - Google Patents
Memory, overhead line single-phase earth fault detection method, system and equipment Download PDFInfo
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- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The invention discloses a memory, a method, a system and equipment for detecting single-phase earth faults of an overhead line, wherein the method comprises the steps that fault detection terminals respectively provided with all towers comprise a current sensing module for sensing the earth current value of the overhead line and a wireless module for sending monitoring data; the remote server acquires monitoring data, and preliminarily judges whether the tower corresponding to the fault detection terminal has single-phase earth fault or not according to a preset rule by taking the monitoring data as input; when the result of the preliminary judgment is yes, positioning the tower suspected of being in fault according to the identification; respectively acquiring monitoring data of fault detection terminals of a preset number of towers at two sides of a suspected fault tower; and determining whether the result of the preliminary judgment of the suspected fault tower is correct or not according to the ground current values of the towers at two sides of the suspected fault tower. The invention can realize accurate and timely judgment and positioning of the single-phase earth fault of the overhead line.
Description
Technical Field
The invention relates to the field of power transmission, in particular to a method, a system and equipment for detecting single-phase earth faults of a storage and an overhead line.
Background
The more the single-phase earth fault of the overhead line, the more the adverse effect is caused to the distribution line, and the more serious the consequence is. By establishing a fault monitoring system, the occurrence of a ground fault can be responded to and located.
The current detection of the single-phase earth fault of the overhead line comprises an impedance method and an alternating current injection method, wherein the working principle of the impedance method is as follows: the method comprises the steps of calculating the impedance of a fault loop according to the current and the voltage measured when a fault occurs, then estimating the fault distance according to the relation between the length of a line and the impedance on the assumption that the line is a uniform line and the impedance is in direct proportion. The working principle of the alternating current injection method is as follows: the fault section is isolated by using a recloser, then a high-voltage signal is injected, a current of 100-200 mA is kept, the fault section is detected from the initial end of the section along a line by using a detector, if a signal difference more than twice before and after a detection position exists, the detection position can be judged as a fault point, but the method has the defects that the error of the detection result is large, and misjudgment is easily caused.
From the above, a method for detecting a single-phase ground fault of an overhead line is urgently needed at present, so that the single-phase ground fault of the overhead line can be accurately and timely judged and positioned.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Disclosure of Invention
The invention aims to provide a detection scheme capable of accurately and timely judging and positioning the single-phase earth fault of the overhead line.
The invention provides a single-phase ground fault detection method for an overhead line, which comprises the following steps:
s11, the fault detection terminals respectively provided with the towers comprise current sensing modules for sensing the earth current values of the overhead lines and wireless modules for sending monitoring data; the monitoring data comprises the ground current value and the identification of the fault detection terminal;
s12, the remote server acquires the monitoring data, and preliminarily judges whether the tower corresponding to the fault detection terminal has single-phase earth fault according to a preset rule by taking the monitoring data as input;
s13, when the result of the initial judgment is yes, positioning the suspected fault tower according to the identification of the fault detection terminal in the monitoring data;
s14, respectively acquiring monitoring data of fault detection terminals of a preset number of towers at two sides of a suspected fault tower;
and S15, determining whether the result of the preliminary judgment of the suspected fault tower is correct according to the ground current values of the towers at the two sides of the suspected fault tower.
In the present invention, the positioning the tower suspected of having the fault according to the identifier of the fault detection terminal in the monitoring data includes:
and positioning the tower suspected of having the fault according to the corresponding relation between the preset identification of the fault detection terminal and the position of the tower.
In the present invention, the presetting number of towers on both sides of the tower with suspected fault includes:
and one of two sides of the suspected fault tower is close to the tower.
In the present invention, the determining whether the result of the preliminary judgment of the tower with the suspected fault is correct according to the ground current values of the towers at the two sides of the tower with the suspected fault includes:
according to the earth current values of the suspected faulty towers and the towers on two sides of the suspected faulty towers, constructing a curve graph for identifying the earth current values of all the towers;
and when the earth current value of the tower suspected of being in the fault is the peak value in the curve graph, determining that the result of the preliminary judgment is correct.
In the present invention, the determining whether the result of the preliminary judgment of the tower with the suspected fault is correct according to the ground current values of the towers at the two sides of the tower with the suspected fault includes:
and when the earth current value of the suspected fault tower is larger than the earth current values of the two adjacent towers, determining that the result of the preliminary judgment is correct.
In the invention, the overhead line adopts a protection mode that a neutral point is not grounded or a grounding mode that the overhead line is grounded through an arc suppression coil.
In the invention, the current induction module comprises an electromagnetic induction coil and an SPD surge protector;
the electromagnetic induction coil consists of complete annular metal and a secondary coil wound on the complete annular metal;
the SPD surge protector is used for preventing lightning or power frequency initial heavy current.
On the other side of the embodiment of the invention, the invention also provides a single-phase grounding fault detection system for the overhead line, which comprises a fault detection terminal and a remote server;
the fault detection terminals respectively provided with each tower comprise a current sensing module for sensing the earth current value of the overhead line and a wireless module for sending monitoring data; the monitoring data comprises the ground current value and the identification of the fault detection terminal;
the remote server comprises an initial judgment unit, a positioning unit, a value taking unit and a final judgment unit;
the initial judgment unit is used for acquiring the monitoring data and primarily judging whether the tower corresponding to the fault detection terminal has a single-phase earth fault or not according to a preset rule by taking the monitoring data as input;
the positioning unit is used for positioning the suspected fault tower according to the identification of the fault detection terminal in the monitoring data when the preliminary judgment result is yes;
the value taking unit is used for respectively acquiring monitoring data of fault detection terminals of a preset number of towers at two sides of a suspected fault tower;
and the final judgment unit is used for determining whether the primary judgment result of the suspected fault tower is correct according to the ground current values of the towers at two sides of the suspected fault tower.
In another aspect of the embodiment of the present invention, there is also provided a memory including a software program adapted to execute the steps of the above-mentioned overhead line single-phase ground fault detection method by a processor.
In another aspect of the embodiments of the present invention, there is also provided an overhead line single-phase ground fault detection apparatus, where the overhead line single-phase ground fault detection apparatus includes a computer program stored on a memory, where the computer program includes program instructions, and when the program instructions are executed by a computer, the computer executes the method described in the above aspects, and achieves the same technical effect.
Compared with the prior art, the invention has the following beneficial effects:
firstly, arranging a fault detection terminal on each tower of an overhead line to acquire a ground current value of the overhead line, and then sending the ground current value to a remote server through a wireless module; therefore, the remote server can obtain the earth current value of each tower; by respectively preliminarily judging the ground current values of all the towers, the tower with the ground current value exceeding the preset value can be preliminarily judged as a suspected fault tower and positioned. In order to avoid erroneous judgment, in the method, monitoring data of fault detection terminals of a preset number of towers at two sides of a suspected fault tower are respectively acquired; and then, whether the preliminary judgment result of the tower with the suspected fault is correct or not is determined by integrating the ground current values of the tower with the suspected fault and towers on two sides of the tower with the suspected fault, so that the single-phase ground fault of the overhead line is accurately and timely judged and positioned.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood and to make the technical means implementable in accordance with the contents of the description, and to make the above and other objects, technical features, and advantages of the present invention more comprehensible, one or more preferred embodiments are described below in detail with reference to the accompanying drawings.
Drawings
FIG. 1 is a schematic diagram of the steps of the overhead line single-phase ground fault detection method of the present invention;
FIG. 2 is a schematic structural diagram of an overhead line single-phase ground fault detection system according to the present invention;
FIG. 3 is a schematic diagram of the remote server according to the present invention;
fig. 4 is a schematic structural diagram of the overhead line single-phase ground fault detection device.
Detailed Description
The following detailed description of the present invention is provided in conjunction with the accompanying drawings, but it should be understood that the scope of the present invention is not limited to the specific embodiments.
Throughout the specification and claims, unless explicitly stated otherwise, the word "comprise", or variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated element or component but not the exclusion of any other element or component.
Spatially relative terms, such as "below," "lower," "upper," "above," "upper," and the like, may be used herein for ease of description to describe one element or feature's relationship to another element or feature in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the object in use or operation in addition to the orientation depicted in the figures. For example, if the items in the figures are turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" the elements or features. Thus, the exemplary term "below" can encompass both an orientation of below and above. The article may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative terms used herein should be interpreted accordingly.
In this document, the terms "first", "second", etc. are used to distinguish two different elements or portions, and are not used to define a particular position or relative relationship. In other words, the terms "first," "second," and the like may also be interchanged with one another in some embodiments.
In order to accurately and timely judge and position the single-phase earth fault of the overhead line, as shown in fig. 1, the embodiment of the invention provides a single-phase earth fault detection method of the overhead line, which comprises the following steps:
s11, the fault detection terminals respectively provided with the towers comprise current sensing modules for sensing the earth current values of the overhead lines and wireless modules for sending monitoring data; the monitoring data comprises the ground current value and the identification of the fault detection terminal;
the overhead line single-phase earth fault detection system in the embodiment of the invention comprises a remote server and a plurality of fault detection terminals; the fault detection terminal is respectively arranged on each tower in the overhead line, and a current induction module in the fault detection terminal is used for detecting the earth current value of the tower; the wireless module sends the monitoring data including the ground current value and the identification of the fault detection terminal to the remote server.
In practical application, the position of each tower can be determined through the identification of the fault detection terminal, and further, when the ground current value of the tower is abnormal, the ground fault can be positioned according to the monitoring data.
In the embodiment of the invention, the overhead line adopts a protection mode that a neutral point is not grounded or a grounding mode that the overhead line is grounded through an arc suppression coil.
The current induction module in the embodiment of the invention can specifically comprise an electromagnetic induction coil and an SPD surge protector;
the electromagnetic induction coil of the current induction module consists of complete annular metal and a secondary coil wound on the complete annular metal;
the SPD surge protector is used for preventing lightning or power frequency initial heavy current.
S12, the remote server acquires the monitoring data, and preliminarily judges whether the tower corresponding to the fault detection terminal has single-phase earth fault according to a preset rule by taking the monitoring data as input;
the remote server in the embodiment of the invention is used as a data processing center, and can perform data analysis according to the monitoring data received from each fault detection terminal so as to determine whether each tower has a single-phase earth fault.
In practical application, whether a single-phase earth fault exists in a tower corresponding to a fault detection terminal is preliminarily judged according to a preset rule, a specific mode can be that a threshold range is preset, when the earth current value in monitoring data of a certain tower exceeds the threshold range, the tower is preliminarily judged to be likely to have the earth fault, and at the moment, the tower can be called as a suspected fault tower.
Further, the preset rule may further include:
when a single-phase grounding fault caused by breakdown of a lightning arrester or an insulator occurs on a certain tower N of the overhead line, the grounding wire of the tower N has an obvious grounding current value I; therefore, whether the tower is possible to have a single-phase earth fault or not is judged by analyzing the earth current value I. When the value of the current to ground I is at Ik＜I≤kI0And meanwhile, the suspected single-phase earth fault of the position of the overhead line on the tower can be judged.
Wherein Ik is unbalanced current when the overhead line normally operates, k is a reliability coefficient, and a coefficient I0 is zero-sequence current; wherein, Ik=0.15I0。
S13, when the result of the initial judgment is yes, positioning the suspected fault tower according to the identification of the fault detection terminal in the monitoring data;
the monitoring data comprises the identification of the fault detection terminal, so that after a certain tower is judged to be a suspected fault tower according to the ground current value in the monitoring data, the suspected fault tower can be further positioned according to the identification of the fault detection terminal in the monitoring data, namely, which tower is possible to have a ground fault and the position of the tower are determined.
S14, respectively acquiring monitoring data of fault detection terminals of a preset number of towers at two sides of a suspected fault tower;
whether each tower has a ground fault or not is judged by simply determining whether the ground fault occurs through the threshold range, which is likely to cause misjudgment because the ground current in the tower is influenced by the adjacent towers, thereby causing the abnormal ground current of the tower without the fault.
Based on the above reasons, in the embodiment of the present invention, when it is determined that a certain tower is a tower suspected to have a fault, it is further required to verify whether the result of the preliminary determination is correct through monitoring data of adjacent towers.
In practical application, one tower position with a ground fault can respectively affect the ground currents in a plurality of towers at two sides of the tower position, and the influence degree is larger when the distance is closer; typically, the monitoring data of one tower on each of two sides of the tower suspected of having the fault can be respectively taken to verify whether the result of the preliminary judgment is correct or not; of course, a person skilled in the art may also take the monitoring data of a plurality of towers respectively on both sides of the tower suspected of having the fault as needed to verify whether the result of the preliminary determination is correct.
And S15, determining whether the result of the preliminary judgment of the suspected fault tower is correct according to the ground current values of the towers at the two sides of the suspected fault tower.
The tower position with the ground fault respectively influences the ground currents in a plurality of towers at two sides of the tower position, the influence degree is larger as the distance is closer, the specific expression is that the ground current value of the tower position with the ground fault is the largest, the adjacent tower receives the influence, the ground current abnormality can also occur, but the ground current value of the tower receiving the influence is smaller than the ground current value of the tower position with the ground fault.
The inventor finds that under the influence of the ground current of the tower position where the ground fault really occurs, the towers on two adjacent sides of the tower position can generate the ground current; the ground current value of the adjacent tower pole is generally smaller than the ground current value of the tower position actually having the ground fault and larger than one tenth of the ground current value of the tower position actually having the ground fault, specifically:
even if the tower N +1 or N-1 close to the tower N with the fault is preliminarily judged to be a tower with the suspected fault due to the ground current value I 'according to the preset rule, when the range of the ground current value I' corresponding to the tower N +1 or N-1 is more than 0.1I and less than I ', the ground current value I' close to the tower N +1 or N-1 is judged to be influenced by the tower N with the fault, the tower N +1 or N-1 does not have the fault, and the tower N +1 or N-1 is in a safe state, so that the misjudgment can be avoided.
From the above, if the ground current values of the adjacent towers at the two sides of the suspected faulty tower are smaller than the ground current value of the suspected faulty tower, the suspected faulty tower is the tower which really has the ground fault; if the earth current value of a certain tower close to the suspected faulty tower is larger than that of the tower close to the suspected faulty tower, it is indicated that the earth current value abnormality of the suspected faulty tower is caused by the influence of the earth fault of the tower close to the tower, and the suspected faulty tower does not have a fault. That is to say, when the earth current value of the suspected tower with the fault is greater than the earth current values of the two adjacent towers, the result of the preliminary judgment is determined to be correct, and otherwise, the preliminary result is determined to be misjudgment.
Based on the above principle, in the embodiment of the present invention, whether the result of the preliminary determination of the tower suspected of having the fault is correct is determined according to the ground current values of the towers on the two sides of the tower suspected of having the fault, and the specific steps may include:
firstly, according to the earth current values of suspected faulty towers and towers on two sides of the suspected faulty towers, constructing a curve graph for identifying the earth current values of all the towers; the abscissa in the graph is the suspected fault towers and towers on two sides of the suspected fault towers which are sequentially arranged; the ordinate is the corresponding earth current value of each tower pole; in practical application, one tower with suspected faults and towers on two sides of the tower with suspected faults can be taken, and a plurality of towers can be taken.
When the earth current value of the tower suspected of being in fault is the peak value in the curve graph, the result of the preliminary judgment is determined to be correct,
in the whole curve, the tower with the earth current value at the peak value is the tower which really has the earth fault, if not, the tower with the suspected fault can be judged that the earth current value abnormality of the tower with the suspected fault is caused by the influence of the adjacent tower earth fault, and the tower does not have the fault.
In another aspect of the embodiment of the present invention, a single-phase ground fault detection system for an overhead line is further provided, and fig. 2 illustrates a schematic structural diagram of the single-phase ground fault detection system for an overhead line provided in the embodiment of the present invention, where the single-phase ground fault detection system for an overhead line is a system corresponding to the single-phase ground fault detection method for an overhead line in the embodiment corresponding to fig. 1, and may be implemented by an electronic device, such as a network device, a terminal device, or a server. Specifically, the overhead line single-phase earth fault detection system in the embodiment of the invention comprises a fault detection terminal 01 and a remote server 02;
the fault detection terminal 01 respectively provided with each tower comprises a current sensing module 11 for sensing the earth current value of the overhead line and a wireless module 12 for sending monitoring data; the monitoring data comprise the ground current value and the identifier of the fault detection terminal 01;
as shown in fig. 3, the remote server 02 includes an initial judgment unit 21, a positioning unit 22, a value taking unit 23, and a final judgment unit 24;
the initial judgment unit 21 is configured to obtain the monitoring data, and primarily judge whether a single-phase ground fault exists in a tower corresponding to the fault detection terminal 01 according to a preset rule by using the monitoring data as an input;
the positioning unit 22 is configured to, when the initial determination result is yes, position the tower suspected of having the fault according to the identifier of the fault detection terminal 01 in the monitoring data;
the value taking unit 23 is configured to obtain monitoring data of fault detection terminals 01 of a preset number of towers on both sides of a suspected fault tower respectively;
the final judgment unit 24 is configured to determine whether the result of the preliminary judgment of the suspected faulty tower is correct according to the ground current values of the towers on the two sides of the suspected faulty tower.
Since the working principle and the beneficial effects of the overhead line single-phase ground fault detection system in the embodiment of the invention have been recorded and described in the overhead line single-phase ground fault detection method corresponding to fig. 1, they can be referred to each other and are not described herein again.
In an embodiment of the present invention, there is further provided a memory, where the memory includes a software program, and the software program is adapted to be executed by a processor to execute the steps in the overhead line single-phase ground fault detection method corresponding to fig. 1.
The embodiment of the present invention can be implemented by a software program, that is, by writing a software program (and an instruction set) for implementing each step in the overhead line single-phase ground fault detection method corresponding to fig. 1, the software program is stored in a storage device, and the storage device is provided in a computer device, so that the software program can be called by a processor of the computer device to implement the purpose of the embodiment of the present invention.
In an embodiment of the present invention, there is also provided an overhead line single-phase ground fault detection apparatus, where a memory included in the overhead line single-phase ground fault detection apparatus includes a corresponding computer program product, and when a program instruction included in the computer program product is executed by a computer, the computer may execute the method for detecting an overhead line single-phase ground fault according to the above aspects, and achieve the same technical effects.
Fig. 4 is a schematic diagram of a hardware structure of an overhead line single-phase ground fault detection device as an electronic device according to an embodiment of the present invention, and as shown in fig. 4, the device includes one or more processors 610, a bus 630, and a memory 620. Taking one processor 610 as an example, the apparatus may further include: input device 640, output device 650.
The processor 610, the memory 620, the input device 640, and the output device 650 may be connected by a bus or other means, such as the bus connection in fig. 4.
The memory 620, which is a non-transitory computer readable storage medium, may be used to store non-transitory software programs, non-transitory computer executable programs, and modules. The processor 610 executes various functional applications and data processing of the electronic device, i.e., the processing method of the above-described method embodiment, by executing the non-transitory software programs, instructions and modules stored in the memory 620.
The memory 620 may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data and the like. Further, the memory 620 may include high speed random access memory, and may also include non-transitory memory, such as at least one magnetic disk storage device, flash memory device, or other non-transitory solid state storage device. In some embodiments, the memory 620 optionally includes memory located remotely from the processor 610, which may be connected to the processing device via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The input device 640 may receive input numeric or character information and generate a signal input. The output device 650 may include a display device such as a display screen.
The one or more modules are stored in the memory 620 and, when executed by the one or more processors 610, perform:
the fault detection terminals respectively provided with each tower comprise a current sensing module for sensing the earth current value of the overhead line and a wireless module for sending monitoring data; the monitoring data comprises the ground current value and the identification of the fault detection terminal;
acquiring the monitoring data, and preliminarily judging whether the tower corresponding to the fault detection terminal has a single-phase earth fault according to a preset rule by taking the monitoring data as input;
when the result of the preliminary judgment is yes, positioning the suspected fault tower according to the identification of the fault detection terminal in the monitoring data;
respectively acquiring monitoring data of fault detection terminals of a preset number of towers at two sides of a suspected fault tower;
and determining whether the result of the preliminary judgment of the suspected fault tower is correct or not according to the ground current values of the towers at two sides of the suspected fault tower.
The product can execute the method provided by the embodiment of the invention, and has corresponding functional modules and beneficial effects of the execution method. For technical details that are not described in detail in this embodiment, reference may be made to the method provided by the embodiment of the present invention.
In the embodiments provided in the present invention, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage device and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage device includes: a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a ReRAM, an MRAM, a PCM, a NAND Flash, a NOR Flash, a Memory, a magnetic disk, an optical disk, or other various media that can store program codes.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A single-phase grounding fault detection method for an overhead line is characterized by comprising the following steps:
s11, the fault detection terminals respectively provided with the towers comprise current sensing modules for sensing the earth current values of the overhead lines and wireless modules for sending monitoring data; the monitoring data comprises the ground current value and the identification of the fault detection terminal;
s12, the remote server acquires the monitoring data, and preliminarily judges whether the tower corresponding to the fault detection terminal has single-phase earth fault according to a preset rule by taking the monitoring data as input;
s13, when the result of the initial judgment is yes, positioning the suspected fault tower according to the identification of the fault detection terminal in the monitoring data;
s14, respectively acquiring monitoring data of fault detection terminals of a preset number of towers at two sides of a suspected fault tower;
and S15, determining whether the result of the preliminary judgment of the suspected fault tower is correct according to the ground current values of the towers at the two sides of the suspected fault tower.
2. The overhead line single-phase earth fault detection method of claim 1, wherein the positioning suspected faulty tower according to the identification of the fault detection terminal in the monitoring data comprises:
and positioning the tower suspected of having the fault according to the corresponding relation between the preset identification of the fault detection terminal and the position of the tower.
3. The method for detecting the single-phase earth fault of the overhead line according to claim 2, wherein the step of presetting a number of towers on two sides of the tower with the suspected fault comprises the following steps:
and one of two sides of the suspected fault tower is close to the tower.
4. The method for detecting the single-phase ground fault of the overhead line according to any one of claims 1 to 3, wherein the step of determining whether the result of the preliminary judgment of the tower with the suspected fault is correct according to the ground current values of the towers at two sides of the tower with the suspected fault comprises the following steps:
according to the earth current values of the suspected faulty towers and the towers on two sides of the suspected faulty towers, constructing a curve graph for identifying the earth current values of all the towers;
and when the earth current value of the tower suspected of being in the fault is the peak value in the curve graph, determining that the result of the preliminary judgment is correct.
5. The method for detecting the single-phase earth fault of the overhead line according to claim 3, wherein the step of determining whether the result of the preliminary judgment of the tower with the suspected fault is correct according to the earth current values of the towers at two sides of the tower with the suspected fault comprises the following steps:
and when the earth current value of the suspected fault tower is larger than the earth current values of the two adjacent towers, determining that the result of the preliminary judgment is correct.
6. The overhead line single-phase ground fault detection method of claim 5, comprising:
the overhead line adopts a protection mode that a neutral point is not grounded or a grounding mode that the overhead line is grounded through an arc suppression coil.
7. The overhead line single-phase ground fault detection method of claim 1, wherein the current sensing module comprises an electromagnetic induction coil and an SPD surge protector;
the electromagnetic induction coil consists of complete annular metal and a secondary coil wound on the complete annular metal;
the SPD surge protector is used for preventing lightning or power frequency initial heavy current.
8. A single-phase grounding fault detection system for an overhead line is characterized by comprising a fault detection terminal and a remote server;
the fault detection terminals respectively provided with each tower comprise a current sensing module for sensing the earth current value of the overhead line and a wireless module for sending monitoring data; the monitoring data comprises the ground current value and the identification of the fault detection terminal;
the remote server comprises an initial judgment unit, a positioning unit, a value taking unit and a final judgment unit;
the initial judgment unit is used for acquiring the monitoring data and primarily judging whether the tower corresponding to the fault detection terminal has a single-phase earth fault or not according to a preset rule by taking the monitoring data as input;
the positioning unit is used for positioning the suspected fault tower according to the identification of the fault detection terminal in the monitoring data when the preliminary judgment result is yes;
the value taking unit is used for respectively acquiring monitoring data of fault detection terminals of a preset number of towers at two sides of a suspected fault tower;
and the final judgment unit is used for determining whether the primary judgment result of the suspected fault tower is correct according to the ground current values of the towers at two sides of the suspected fault tower.
9. Memory, characterized in that it comprises a software program adapted to execute the steps of the overhead line single-phase ground fault detection method according to any one of claims 1 to 7 by a processor.
10. An overhead line single phase ground fault detection device comprising a bus, a processor and a memory as claimed in claim 9;
the bus is used for connecting the memory and the processor;
the processor is configured to execute a set of instructions in the memory.
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