High-voltage cable cross interconnection grounding mode live-line inspection method and related device

Abstract

The invention discloses a high-voltage cable cross interconnection grounding mode live-line inspection method, which comprises the following steps: 1) when the number of cross interconnection sections of a high-voltage cable is greater than 1, taking direct grounding boxes on two sides of the boundary of adjacent cross interconnection sections as signal receiving ends, taking a direct grounding box shared by the adjacent cross interconnection sections as a signal transmitting end, and taking a direct grounding box shared by the adjacent cross interconnection sections as a signal receiving end; the direct grounding points on the two sides of each crossed interconnection section respectively form a loop; when the number of the crossed and interconnected sections of the high-voltage cable is 1, the direct grounding points on the two sides of the crossed and interconnected sections of the high-voltage cable form loops respectively; 2) injecting a preset frequency modulation signal generated by the signal transmitting device into any phase of one side of the to-be-inspected high-voltage cable, and receiving a modulation signal returned by the other side of the to-be-inspected high-voltage cable by the signal receiving device; and 3) judging the crossed interconnection grounding mode of the high-voltage cable. The method and the related device can realize live detection of the crossed interconnection grounding mode of the high-voltage cable.

Description

Technical Field

[0001] The present invention belongs to the technical field of power cable detection, and relates to a method for detecting a cross-connected grounding mode of a high-voltage cable and a related device. Background Art

[0002] For long single-core cable lines of 110kV and above, the cable's metal sheath is typically interconnected in a three-phase cross-connection configuration to reduce the impact of induced current on the cable's current-carrying capacity. During cable grounding box installation, due to the complex wiring of this method, construction workers can easily misconnect the connecting plates within the box. This can lead to inconsistent phase sequences between two cross-connected grounding boxes within a complete cross-connection section, resulting in abnormal circulating current values ​​around the metal sheath under heavy cable loads. These high circulating currents not only reduce the cable's current-carrying capacity but also generate additional heat loss, accelerating aging of the cable's main insulation.

[0003] At present, the majority of cases of abnormal circulating current of cable metal sheaths that have appeared on site are caused by inconsistent connecting plates in the cross-connection box, resulting in unbalanced three-phase circulating current or large amplitude differences. Among the identification methods, one type uses online acquisition devices or on-site live detection to obtain the circulating current power frequency signal, and analyzes whether the circulating current is abnormal based on the current technical specifications for high-voltage cable status detection and the inherent judgment criteria. When the cable load current is small, the difference in the circulating current amplitude is not obvious, which can easily lead to misjudgment; when the load current is large, it may not be determined to be abnormal circulating current, resulting in defective operation of the cable. The other type is to open the cover of the grounding box and visually check whether the wiring of the connecting plates in the box is correct. This method is mostly carried out when the cable is energized. There is a high risk of electric shock when removing the cover of the grounding box, and it is time-consuming and labor-intensive. Summary of the Invention

[0004] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a method and related device for live inspection of the cross-interconnected grounding mode of high-voltage cables. This method and related device can realize live detection of the cross-interconnected grounding mode of high-voltage cables without removing the cover of the grounding box when the cable is running live.

[0005] To achieve the above object, the present invention discloses a method for live inspection of a cross-connected grounding mode of a high-voltage cable, comprising the following steps:

[0006] 1) Determine the number of cross-connected sections of the high-voltage cable. When the number of cross-connected sections of the high-voltage cable is greater than 1, the direct grounding boxes on both sides of the boundaries of adjacent cross-connected sections are used as signal receiving ends, and the direct grounding box shared by the adjacent cross-connected sections is used as the signal transmitting end. The direct grounding points on both sides of each cross-connected section respectively constitute a loop; when the number of cross-connected sections of the high-voltage cable is 1, the direct grounding points on both sides of the cross-connected section of the high-voltage cable respectively constitute a loop;

[0007] 2) When the cable is running live and the box cover is not removed, use a coupled cable live identification instrument to inject the preset frequency modulated signal generated by the signal transmitter into any phase on one side of the high-voltage cable to be inspected through a coupling clamp or a coupling coil. The signal receiving device receives the modulated signal transmitted back from the other side of the high-voltage cable to be inspected;

[0008] 3) Determine the cross-connection grounding mode of the high-voltage cable based on the phase direction and amplitude of the returned modulated signal.

[0009] The further improvement of the live inspection method for the cross-connected grounding mode of high-voltage cables of the present invention is as follows:

[0010] Furthermore, the phase sequence calibrated by the direct grounding boxes on both sides of the boundary of the adjacent cross-interconnected sections is consistent with the three-phase sequence of the high-voltage cable.

[0011] Furthermore, the coupled cable live identification instrument can be applied to multiple complete cross-connected sections with a length greater than 5 km. The signal transmitting device is provided with multiple signal output ports, and each signal output port can simultaneously emit output signals of different frequencies; at the same time, the number of signal receiving devices is multiple.

[0012] Furthermore, the process of determining the cross-connection grounding mode of the high-voltage cable according to the phase direction and amplitude of the returned modulation signal is as follows:

[0013] The phase direction and amplitude of the received modulated signal are compared with the phase direction and amplitude of the transmitted modulated signal, and the cross-connection grounding mode of the high-voltage cable is determined based on the comparison result.

[0014] Furthermore, the cross-connection grounding methods of the high-voltage cables are divided into four categories:

[0015] The first correct phase sequence is that the aluminum sheaths of the first section of cable of phase A are connected with the second section of cable of phase B and the third section of cable of phase C; the aluminum sheaths of the first section of cable of phase B are connected with the second section of cable of phase C and the third section of cable of phase A; the aluminum sheaths of the first section of cable of phase C are connected with the second section of cable of phase A and the third section of cable of phase B;

[0016] The second correct phase sequence is that the aluminum sheaths of the first section of cable of phase A are connected to the aluminum sheaths of the second section of cable of phase C and the third section of cable of phase B; the aluminum sheaths of the first section of cable of phase B are connected to the aluminum sheaths of the second section of cable of phase A and the third section of cable of phase C; and the aluminum sheaths of the first section of cable of phase C are connected to the aluminum sheaths of the second section of cable of phase B and the third section of cable of phase A.

[0017] The first incorrect phase sequence is that the aluminum sheaths of the first section of cable of phase A are connected to the aluminum sheaths of the second section of cable of phase B and the third section of cable of phase A; the aluminum sheaths of the first section of cable of phase B are connected to the aluminum sheaths of the second section of cable of phase C and the third section of cable of phase B; and the aluminum sheaths of the first section of cable of phase C are connected to the aluminum sheaths of the second section of cable of phase A and the third section of cable of phase C.

[0018] The second incorrect phase sequence is that the aluminum sheaths of the first section of cable of phase A are connected with the second section of cable of phase C and the third section of cable of phase A; the aluminum sheaths of the first section of cable of phase B are connected with the second section of cable of phase A and the third section of cable of phase B; and the aluminum sheaths of the first section of cable of phase C are connected with the second section of cable of phase B and the third section of cable of phase C.

[0019] The present invention discloses a live inspection system for a high-voltage cable cross-connected grounding method, comprising:

[0020] A determination module is used to determine the number of cross-interconnected sections of the high-voltage cable. When the number of cross-interconnected sections of the high-voltage cable is greater than 1, the direct grounding boxes on both sides of the boundaries of adjacent cross-interconnected sections are used as signal receiving ends, and the direct grounding boxes shared by adjacent cross-interconnected sections are used as signal transmitting ends. The direct grounding points on both sides of each cross-interconnected section respectively form a loop; when the number of cross-interconnected sections of the high-voltage cable is 1, the direct grounding points on both sides of the cross-interconnected section of the high-voltage cable respectively form a loop;

[0021] The detection module is used to use a coupled cable live identification instrument to inject a preset frequency modulated signal generated by a signal transmitter into any phase on one side of the high-voltage cable to be inspected through a coupling clamp or a coupling coil when the cable is running live and the box cover is not removed. The signal receiving device receives the modulated signal returned from the other side of the high-voltage cable to be inspected;

[0022] The judgment module is used to judge the cross-connection grounding mode of the high-voltage cable according to the phase direction and amplitude of the returned modulation signal.

[0023] Furthermore, the phase sequence calibrated by the direct grounding boxes on both sides of the boundary of the adjacent cross-interconnected sections is consistent with the three-phase sequence of the high-voltage cable.

[0024] Furthermore, the coupled cable live identification instrument can be applied to multiple complete cross-connected sections with a length greater than 5 km. The signal transmitting device is provided with multiple signal output ports, and each signal output port can simultaneously emit output signals of different frequencies; at the same time, the number of signal receiving devices is multiple.

[0025] The present invention discloses a computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps of the live inspection method for the cross-connected grounding mode of high-voltage cables are implemented.

[0026] The present invention discloses a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the live inspection method for a cross-connected grounding mode of a high-voltage cable are implemented.

[0027] The present invention has the following beneficial effects:

[0028] During specific operation of the live inspection method and related devices for the cross-interconnected grounding mode of high-voltage cables described in the present invention, when the cable is running under power and the box cover is not removed, a coupled cable live identification instrument is used to inject a preset frequency modulated signal generated by a signal transmitting device into any phase on one side of the high-voltage cable to be inspected through a coupling clamp or a coupling coil. The signal receiving device receives the modulated signal returned from the other side of the high-voltage cable to be inspected, and uses this to determine the cross-interconnected grounding mode of the high-voltage cable, thereby realizing live detection of the cross-interconnected grounding mode of the high-voltage cable when the cable is running under power and without removing the grounding box cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings, which constitute part of the present invention, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0030] Figure 1 This is a schematic diagram of the implementation principle of the present invention for two continuous cross-connected segments in actual field.

[0031] Figure 2 The present invention is directed to the implementation principle diagram of the first correct cross-interconnection grounding method;

[0032] Figure 3 This is a schematic diagram of the first correct cross-interconnection grounding method summarized in the present invention;

[0033] Figure 4 A schematic diagram of the second correct cross-connection grounding method summarized in the present invention;

[0034] Figure 5 This is a schematic diagram of the first incorrect cross-connection grounding method summarized in the present invention;

[0035] Figure 6 A schematic diagram of the second incorrect cross-connection grounding method summarized in the present invention;

[0036] Figure 7 This is a schematic diagram of the implementation principle of the present invention for the first erroneous cross-interconnection grounding mode. DETAILED DESCRIPTION

[0037] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0038] In the description of the present invention, it is to be understood that the terms “include” and “comprise” indicate the presence of the described features, wholes, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or collections thereof.

[0039] It should also be understood that the terms used in the present specification are only for the purpose of describing particular embodiments and are not intended to limit the present invention. As used in the present specification and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms unless the context clearly indicates otherwise.

[0040] It should be further understood that the term "and / or" as used in the present specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items. For example, A and / or B may represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in the present invention generally indicates that the associated objects are in an "or" relationship.

[0041] It should be understood that although the terms "first," "second," and "third" may be used to describe preset ranges in embodiments of the present invention, these preset ranges should not be limited to these terms. These terms are merely used to distinguish one preset range from another. For example, without departing from the scope of embodiments of the present invention, the first preset range may also be referred to as the second preset range, and similarly, the second preset range may also be referred to as the first preset range.

[0042] The word "if," as used herein, may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting," depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to the determination" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)," depending on the context.

[0043] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0044] The accompanying drawings illustrate various schematic diagrams of structures according to embodiments disclosed herein. These figures are not drawn to scale; for clarity, some details are exaggerated and some details may be omitted. The shapes of the various regions and layers shown in the figures, as well as their relative sizes and positional relationships, are merely exemplary and may deviate in practice due to manufacturing tolerances or technical limitations. Those skilled in the art may design regions / layers with different shapes, sizes, and relative positions as needed.

[0045] Example 1

[0046] The method for live inspection of a cross-connected grounding mode of a high-voltage cable according to the present invention comprises the following steps:

[0047] 1) The present invention summarizes that there are four connection modes for a complete cross-linked phase sequence, such as Figures 3 to 6 shown.

[0048] 2) Take the first correct cross-connection grounding method as an example, Figure 2 As shown in the schematic diagram, a cable live identification instrument is prepared, including a signal transmitter, a signal receiver, a signal transmitter clamp, and a signal receiver clamp. The transmitted signal is injected into the grounding cable through coupling; similarly, the receiving clamp coupled to the grounding cable collects the signal from the transmitter. To verify the correct phase sequence of a high-voltage cable cross-connection, while the cable is live and the box cover is not removed, the grounding box on one side of the complete cross-connection segment boundary serves as the signal transmitter, and the grounding box on the other side serves as the signal receiver. The polarity and amplitude of signals S1 to S4 are used to determine the correct phase sequence.

[0049] 3) Through the coupling clamp or coupling coil, the specific frequency modulation signal S1 generated by the signal generating device is injected into the A1 phase of the grounding cable on one side, and the receiving clamp is put on the C3 phase grounding cable on the other side.

[0050] 4) By Figure 2As can be seen, after signal S1 passes through the metal sheath A1-B2-C3, the attenuated signal S4 is collected by the receiving clamp. Due to the shunting effect, portions of S4, S2 and S3, flow back to the signal transmitter through segments A3 and B3, respectively. S4 has the opposite polarity to S2 and S3. Using the direction of the pulse current S1 input to segment A1 as the identification criterion, segments A3 and B3 only flow through return current. S1 has the opposite polarity to S2 and S3, but the same polarity as S4. Therefore, the receiving clamp is applied to segments A3, B3, and C3 of the grounding cable, respectively. If the signal polarity on segment C3 is the same as S1, and the signal polarity on segments A3 and B3 is opposite to S1, then the cross-connection satisfies the A1-B2-C3 requirement.

[0051] 5) Similarly, when the transmitting clamp is stuck at B1 and C1, the above discrimination principle is used to judge whether the signals of the receiving clamp at A3 and B3 are of the same polarity as the signal of the transmitting end. If both are satisfied, the connection mode of the cross-connection unit can be determined to be A1-B2-C3, B1-C2-A3, C1-A2-B3, and Figure 3 If they are consistent, it is determined that the phase sequence connection of the cross-connection segment is correct.

[0052] 6) Take the first incorrect cross-connection grounding method as an example, Figure 7 In the implementation principle diagram shown, a specific frequency modulation signal S1 generated by a signal generating device is injected into the A1 phase of the grounding cable on one side, and a receiving clamp is put on the C3 phase grounding cable on the other side.

[0053] 7) Due to the shunting effect, a portion of S2's signal, S3 and S4, flows back to the signal transmitter through segments B3 and C3, respectively. The polarity of S2 is opposite to that of S3 and S4. Using the direction of the pulse current S1 input to segment A1 as the identification criterion, segments B3 and C3 only flow through return current. The polarity of S1 is opposite to that of S3 and S4, but the same as that of S2. Therefore, applying the receiving clamp to segments A3, B3, and C3 of the grounding cable, respectively, will reveal that the signal polarity on segment A3 is the same as S1, while the signal polarity on segments B3 and C3 is opposite to that of S1. This indicates that the cross-connection satisfies either A1-B2-A3 or A1-C1-A3.

[0054] 8) Similarly, when the transmitting clamp is stuck at B1 and C1, the above-mentioned discrimination principle is used to judge whether the signals of the receiving clamp at B3 and C2 have the same polarity as the signal at the transmitting end. If all of them are satisfied, it can be determined that the connection mode of the cross-connection unit is A1-B2-A3, B1-C2-B3, C1-A2-C3 or A1-C2-A3, B1-A2-B3, C1-B2-C3, one of which is consistent with the above. Figure 7 The connection methods are the same, so it is determined that the phase sequence connection of the cross-connection segment is wrong.

[0055] 9) The implementation principles of the second correct cross-interconnection grounding method or the second incorrect cross-interconnection grounding method as examples are the same as the above methods and will not be repeated here.

[0056] 10) It should be noted that the aluminum sheath of the single-core cable actually operated on the project site is dead-connected at the straight-through joint, that is, two consecutive cross-connected sections share a direct grounding box. Figure 1 .

[0057] 11) Figure 1 Taking two continuous cross-connection sections at the actual site as an example, the specific frequency modulated signal S1 generated by the signal generator is injected into the A phase of the G2 grounding cable, and the receiving clamps are clamped on the G1 grounding cable and the G3 grounding cable respectively. The first cross-connection unit uses the phase and amplitude information of the signals S2, S4, S5 and S6 to determine the correctness of the phase sequence of the cross-connection section. The second cross-connection unit uses the phase and amplitude information of the signals S3, S7, S8 and S9 to determine the correctness of the phase sequence of the cross-connection section. The implementation principle is the same as the above method.

[0058] It should be noted that in the implementation scenario of this invention, the phase sequence calibrated by the direct grounding boxes on both sides of the cross-connection segment must be correct, that is, consistent with the three-phase phase sequence of the cable body; the coupled cable live identification device used in this invention must be accurately applied to complete cross-connection segments greater than 5km in length. The signal transmitter device has two or more signal output ports and can simultaneously emit output signals of different frequencies; at the same time, it is equipped with two or more signal receivers.

[0059] It should be noted that the present invention has the following characteristics:

[0060] The present invention is not affected by the cable load current, can make judgments under the condition of line no-load or light-load, and is not affected by inherent judgment criteria.

[0061] The present invention can be operated under the condition that the line is energized, and there is no need to open the cover of the cross-connection grounding box, thereby reducing the risk of electric shock.

[0062] The present invention can simultaneously check whether the phase sequence connections of two cross-connected units are correct, thereby improving inspection efficiency and reducing manpower investment.

[0063] The present invention determines the phase sequence connection mode of the complete cross-connection segment through the phase and amplitude of the signal, and the determination result is unique.

[0064] Example 2

[0065] The live inspection system for high-voltage cable cross-connection grounding mode of the present invention comprises:

[0066] A determination module is used to determine the number of cross-interconnected sections of the high-voltage cable. When the number of cross-interconnected sections of the high-voltage cable is greater than 1, the direct grounding boxes on both sides of the boundaries of adjacent cross-interconnected sections are used as signal receiving ends, and the direct grounding boxes shared by adjacent cross-interconnected sections are used as signal transmitting ends. The direct grounding points on both sides of each cross-interconnected section respectively form a loop; when the number of cross-interconnected sections of the high-voltage cable is 1, the direct grounding points on both sides of the cross-interconnected section of the high-voltage cable respectively form a loop;

[0067] The detection module is used to use a coupled cable live identification instrument to inject a preset frequency modulated signal generated by a signal transmitter into any phase on one side of the high-voltage cable to be inspected through a coupling clamp or a coupling coil when the cable is running live and the box cover is not removed. The signal receiving device receives the modulated signal returned from the other side of the high-voltage cable to be inspected;

[0068] The judgment module is used to judge the cross-connection grounding mode of the high-voltage cable according to the phase direction and amplitude of the returned modulation signal.

[0069] In this embodiment, the phase sequence calibrated by the direct grounding boxes on both sides of the boundary of the adjacent cross-interconnected sections is consistent with the three-phase sequence of the high-voltage cable.

[0070] In this embodiment, the coupled cable live identification instrument can be applied to multiple complete cross-connected sections with a length greater than 5 km. The signal transmitting device is provided with multiple signal output ports, and each signal output port can simultaneously emit output signals of different frequencies; at the same time, the number of signal receiving devices is multiple.

[0071] The division of modules in the embodiments of the present application is illustrative and is merely a logical functional division. In actual implementation, other division methods may be used. Furthermore, the functional modules in the various embodiments of the present application may be integrated into a single processor, or may exist physically separately, or two or more modules may be integrated into a single module. The aforementioned integrated modules may be implemented in the form of hardware or software functional modules.

[0072] Example 3

[0073] A computer device comprises a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps of the live inspection method for the cross-connection grounding mode of a high-voltage cable are implemented. For example, the method comprises: determining the number of cross-connection sections of the high-voltage cable; when the number of cross-connection sections of the high-voltage cable is greater than one, using the direct grounding boxes on both sides of the boundaries of adjacent cross-connection sections as signal receiving ends, using the direct grounding boxes shared by the adjacent cross-connection sections as signal transmitting ends, and the direct grounding points on both sides of each cross-connection section respectively forming a loop; when the number of cross-connection sections of the high-voltage cable is one, using the direct grounding points on both sides of the cross-connection section of the high-voltage cable respectively forming a loop; using a coupled cable live identification instrument, with the cable running live and the box cover not removed, to inject a preset frequency modulated signal generated by a signal transmitting device into any phase on one side of the high-voltage cable to be inspected through a coupling clamp or a coupling coil, and a signal receiving device to receive the modulated signal returned from the other side of the high-voltage cable to be inspected; and determining the cross-connection grounding mode of the high-voltage cable based on the phase direction and amplitude of the returned modulated signal. The memory may include internal memory, such as high-speed random access memory, and may also include non-volatile memory, such as at least one disk storage device. The processor, network interface, and memory are interconnected via an internal bus. This internal bus may be an Industry Standard Architecture bus, a Peripheral Component Interconnect Standard bus, an Extended Industry Standard Architecture bus, etc. The bus can be divided into an address bus, a data bus, a control bus, etc. The memory is used to store programs. Specifically, the program may include program code, and the program code includes computer operating instructions. The memory may include internal memory and non-volatile memory, and provides instructions and data to the processor.

[0074] Example 4

[0075] A computer-readable storage medium stores a computer program, which, when executed by a processor, implements the steps of the live inspection method for the cross-connection grounding mode of a high-voltage cable, for example, including: determining the number of cross-connection sections of the high-voltage cable; when the number of cross-connection sections of the high-voltage cable is greater than 1, using the direct grounding boxes on both sides of the boundaries of adjacent cross-connection sections as signal receiving ends, using the direct grounding boxes shared by the adjacent cross-connection sections as signal transmitting ends, and the direct grounding points on both sides of each cross-connection section respectively forming a loop; when the number of cross-connection sections of the high-voltage cable is 1, using the direct grounding points on both sides of the cross-connection section of the high-voltage cable respectively forming a loop; using a coupled cable live identification instrument, with the cable running live and the box cover not being removed, to inject a preset frequency modulated signal generated by a signal transmitting device into any phase on one side of the high-voltage cable to be inspected through a coupling clamp or a coupling coil, and a signal receiving device to receive the modulated signal returned from the other side of the high-voltage cable to be inspected; and judging the cross-connection grounding mode of the high-voltage cable based on the phase direction and amplitude of the returned modulated signal. Specifically, the computer-readable storage medium includes, but is not limited to, volatile memory and / or non-volatile memory. The volatile memory may include random access memory (RAM) and / or cache memory, etc. The non-volatile memory may include read-only memory (ROM), hard disk, flash memory, optical disk, magnetic disk, etc.

[0076] Those skilled in the art will appreciate that the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application can adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application can adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

[0077] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the steps in the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0078] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0079] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0080] Those skilled in the art will readily identify other embodiments of the present invention after considering the specification and disclosure of the invention. This application is intended to cover any variations, uses, or adaptations of the present invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered as exemplary only, with the true scope and spirit of the invention being indicated by the following claims.

[0081] It should be understood that the present invention is not limited to the exact construction described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

[0082] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent structural change made to the above embodiment based on the technical essence of the present invention shall still fall within the scope of protection of the technical solution of the present invention.

Claims

1. A method for live inspection of high voltage cable cross-connection grounding, characterized in that: The following steps are involved: Determine the number of cross-connected sections of the high-voltage cable. When the number of cross-connected sections of the high-voltage cable is greater than 1, the direct grounding boxes on both sides of the boundaries of adjacent cross-connected sections are used as signal receiving ends, and the direct grounding box shared by adjacent cross-connected sections is used as the signal transmitting end. The direct grounding points on both sides of each cross-connected section respectively constitute a loop; when the number of cross-connected sections of the high-voltage cable is 1, the direct grounding points on both sides of the cross-connected section of the high-voltage cable respectively constitute a loop; When the cable is running live and the box cover is not removed, a coupled cable live identification instrument is used to inject a preset frequency modulated signal generated by a signal transmitter into any phase on one side of the high-voltage cable to be inspected through a coupling clamp or a coupling coil. The signal receiving device receives the modulated signal transmitted back from the other side of the high-voltage cable to be inspected. The cross-connection grounding mode of the high-voltage cable is determined according to the phase direction and amplitude of the returned modulation signal.

2. The method for live inspection of high-voltage cable cross-connection grounding according to claim 1 is characterized in that: The phase sequence calibrated by the direct grounding boxes on both sides of the boundary of the adjacent cross-interconnected sections is consistent with the three-phase phase sequence of the high-voltage cable.

3. The method for live inspection of high-voltage cable cross-connection grounding according to claim 1 is characterized in that: The coupled cable live identification instrument can be applied to multiple complete cross-connected sections with a length greater than 5 km. The signal transmitting device is provided with multiple signal output ports, and each signal output port can simultaneously emit output signals of different frequencies; at the same time, the number of signal receiving devices is multiple.

4. The method for live inspection of high-voltage cable cross-connection grounding according to claim 1 is characterized in that: The process of determining the cross-connection grounding mode of the high-voltage cable according to the phase direction and amplitude of the returned modulation signal is as follows: The phase direction and amplitude of the received modulated signal are compared with the phase direction and amplitude of the transmitted modulated signal, and the cross-connection grounding mode of the high-voltage cable is determined based on the comparison result.

5. The method for live inspection of high-voltage cable cross-connection grounding according to claim 1 is characterized in that: The cross-connection grounding methods of the high-voltage cables are divided into four categories: The first correct phase sequence is that the aluminum sheaths of the first section of cable of phase A are connected with the second section of cable of phase B and the third section of cable of phase C; the aluminum sheaths of the first section of cable of phase B are connected with the second section of cable of phase C and the third section of cable of phase A; the aluminum sheaths of the first section of cable of phase C are connected with the second section of cable of phase A and the third section of cable of phase B; The second correct phase sequence is that the aluminum sheaths of the first section of cable of phase A are connected to the aluminum sheaths of the second section of cable of phase C and the third section of cable of phase B; the aluminum sheaths of the first section of cable of phase B are connected to the aluminum sheaths of the second section of cable of phase A and the third section of cable of phase C; and the aluminum sheaths of the first section of cable of phase C are connected to the aluminum sheaths of the second section of cable of phase B and the third section of cable of phase A. The first incorrect phase sequence is that the aluminum sheaths of the first section of cable of phase A are connected to the aluminum sheaths of the second section of cable of phase B and the third section of cable of phase A; the aluminum sheaths of the first section of cable of phase B are connected to the aluminum sheaths of the second section of cable of phase C and the third section of cable of phase B; and the aluminum sheaths of the first section of cable of phase C are connected to the aluminum sheaths of the second section of cable of phase A and the third section of cable of phase C. The second incorrect phase sequence is that the aluminum sheaths of the first section of cable of phase A are connected with the second section of cable of phase C and the third section of cable of phase A; the aluminum sheaths of the first section of cable of phase B are connected with the second section of cable of phase A and the third section of cable of phase B; and the aluminum sheaths of the first section of cable of phase C are connected with the second section of cable of phase B and the third section of cable of phase C.

6. A live inspection system for high-voltage cable cross-connection grounding, characterized in that: include: A determination module is used to determine the number of cross-interconnected sections of the high-voltage cable. When the number of cross-interconnected sections of the high-voltage cable is greater than 1, the direct grounding boxes on both sides of the boundaries of adjacent cross-interconnected sections are used as signal receiving ends, and the direct grounding boxes shared by adjacent cross-interconnected sections are used as signal transmitting ends. The direct grounding points on both sides of each cross-interconnected section respectively form a loop; when the number of cross-interconnected sections of the high-voltage cable is 1, the direct grounding points on both sides of the cross-interconnected section of the high-voltage cable respectively form a loop; The detection module is used to use a coupled cable live identification instrument to inject a preset frequency modulated signal generated by a signal transmitter into any phase on one side of the high-voltage cable to be inspected through a coupling clamp or a coupling coil when the cable is running live and the box cover is not removed. The signal receiving device receives the modulated signal returned from the other side of the high-voltage cable to be inspected; The judgment module is used to judge the cross-connection grounding mode of the high-voltage cable according to the phase direction and amplitude of the returned modulation signal.

7. The high-voltage cable cross-connection grounding mode live inspection system according to claim 6 is characterized in that: The phase sequence calibrated by the direct grounding boxes on both sides of the boundary of the adjacent cross-interconnected sections is consistent with the three-phase phase sequence of the high-voltage cable.

8. The high-voltage cable cross-connection grounding method live inspection system according to claim 6 is characterized in that: The coupled cable live identification instrument can be applied to multiple complete cross-connected sections with a length greater than 5 km. The signal transmitting device is provided with multiple signal output ports, and each signal output port can simultaneously emit output signals of different frequencies; at the same time, the number of signal receiving devices is multiple.

9. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the computer program, the steps of the live inspection method for the cross-connection grounding mode of the high-voltage cable are implemented as described in any one of claims 1 to 7.

10. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the steps of the live inspection method for the cross-connection grounding mode of a high-voltage cable are implemented as described in any one of claims 1 to 7.

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