Insulation defect diagnosis method for T-connection type long-distance power supply line

Abstract

The invention relates to the technical field of power supply line insulation defect detection, in particular to an insulation defect diagnosis method for a T-connection type long-distance power supply line, which comprises a local end power supply conversion device, a controllable T-type junction box and a far-end detection control module. The local side power supply conversion device outputs a voltage level to supply power to the whole line equipment; one end of the controllable T-shaped junction box is connected with the far-end detection control module and supplies power to the far-end detection control module, and the far-end detection module controls the controllable T-shaped junction box according to the level of input voltage and judges whether electric energy is transmitted to the next segment or not. The output voltage of the local side power supply conversion device is adjusted to fall within the voltage detection range of the far-end detection control module in sequence, the insulation performance is judged in combination with the controllable T-shaped junction box controlled in a segmented mode, the method effectively avoids environmental interference such as thunderstorm and vehicle collision, and the method is particularly suitable for expressway power supply scenes.

Description

Technical Field

[0001] The invention relates to the technical field of insulation defect detection of power supply lines, in particular to an insulation defect diagnosis method for a T-connected long-distance power supply line. Background Art

[0002] With the development of the Internet of Things and smart transportation, the power supply and distribution system of highways has gradually changed from the traditional mode to the direction of intelligence and remoteness. In this context, remote power supply systems have been widely used, including components such as local power conversion devices, transmission cables, T-junction boxes, remote power conversion devices and remote devices. The local power conversion device converts the AC power supply of the mains or the new energy power supply (such as wind power generation, photovoltaic power generation, etc.) into a high-voltage DC power supply, and transmits the electric energy to the remote power conversion device through the transmission cable. The latter then converts the high-voltage DC power supply into low-voltage DC power such as 12VDC, 24VDC, 48VDC or AC power such as 220VAC, 380VAC to meet the needs of the remote device. These devices are widely used in smart scenes of highways, especially low-voltage DC devices have become the main type of electricity consumption.

[0003] However, with the gradual promotion of remote power supply technology in smart highway scenarios, the length of power supply lines has increased year by year. Inaccurate construction, external factors such as thunderstorms or vehicle collisions during system operation often lead to frequent tripping of switches on the lines. This phenomenon is usually related to the degradation of insulation performance of the lines, and the existing power supply and distribution system lacks effective insulation performance evaluation methods.

[0004] At present, the insulation detection of highway power supply lines mainly relies on manual operation, using insulation resistance testers to detect them section by section. This method is time-consuming and labor-intensive, with low detection efficiency and difficulty in locating faults in real time. Once the insulation performance of the power supply line has problems, it often leads to restricted traffic on the highway or long-term stagnation of the power supply and distribution system, seriously affecting the operating efficiency and safety of the highway.

[0005] Existing technologies attempt to locate insulation defects by adding information sensing modules, distributed data acquisition modules, distributed processing modules, and information communication modules, combined with ultrasound, ultra-high frequency, pulse current, and infrared thermal imaging technologies. However, this type of solution has the following problems: a large number of peripheral modules need to be added, resulting in a high overall system cost; adding modules will change the existing construction plan, resulting in an increase in construction costs; the solution is not applicable in highway scenarios and is easily affected by external interference; The professional requirements for construction workers are high, which increases the difficulty of implementation.

[0006] Therefore, the existing insulation detection technology is difficult to meet the needs of efficient, economical and accurate detection of the insulation performance of power supply lines in highway scenarios. There is an urgent need for a technical solution with lower cost, more convenient operation and stronger anti-interference ability. Summary of the invention

[0007] The invention provides a method for diagnosing insulation defects of a T-connected long-distance power supply line to solve the problems of the prior art.

[0008] The present invention is achieved through the following technical solutions: A method for diagnosing insulation defects of a T-connected long-distance power supply line, comprising a local power conversion device, a controllable T-type junction box, and a remote detection control module; The output voltage level of the local-end power conversion device supplies power to the overall line equipment; One end of the controllable T-junction box is connected to the remote detection control module to supply power to the remote detection control module, and the other end is in a closed state by default to transmit power to the next segment; The remote detection module controls the controllable T-junction box according to the input voltage level to determine whether to transmit electric energy to the next segment.

[0009] Furthermore, an insulation detection module is provided in the local power conversion device, and the insulation detection module is used for insulation detection of the connection line of the local power conversion device; The remote detection control module is provided with a remote power conversion device, which converts the input voltage level into an output voltage level that adapts to the requirements of other devices or lines to provide power for the remote detection control module.

[0010] Furthermore, there are n controllable T-type junction boxes, and the n T-type junction boxes divide the entire circuit into multiple sections. , , …, The n remote detection control modules are connected to corresponding n T-type junction boxes, and the controllable T-type junction boxes connect or separate the sections.

[0011] Further, the steps are as follows: S1, the remote detection control module determines its independent voltage detection range according to the device number x, and when the input voltage is within the detection range of the remote detection control module, controls the controllable T-type junction box to disconnect from the next segment; S2, from Start detection in sections, define the device number x as 1, adjust the output voltage of the local power conversion device, so that the output voltage falls within the voltage detection range of the remote detection control module x Inside; S3, control the controllable T-junction box x to disconnect Segmented connections; S4, obtain the insulation detection module data in the adjustable local power conversion device, and determine Whether the segment insulation performance is defective; S5. Adjust the output voltage of the local power conversion device so that the output voltage falls within the voltage detection range of the remote detection control module x+1. Inside; S6, after the controllable T-type junction box x is closed Connect in sections, and the controllable T-junction box x+1 is disconnected Segmented connections; S7, obtain the insulation detection module data in the adjustable local power conversion device, and determine Whether the segment insulation performance is defective; S8, jump to the next segment and repeat S2, S3, S4 until a segment insulation defect is detected or the entire line detection is completed.

[0012] Furthermore, the voltage detection range , ,… , There is no intersection between them.

[0013] Beneficial effects of the present invention: (1) The present invention proposes a method for diagnosing insulation defects in a T-connected long-distance power supply line. The method adopts a segmented voltage detection method, adjusts the output voltage of the local power conversion device so that it falls within the voltage detection range of the remote detection control module in turn, and combines a segmented controllable T-type junction box to perform insulation performance judgment. The method does not rely on technologies that are sensitive to the external environment (such as ultrasound, ultra-high frequency or infrared imaging), effectively avoids environmental interference such as thunderstorms and vehicle collisions, and is particularly suitable for highway power supply scenarios; (2) The insulation defect diagnosis method for a T-connected long-distance power supply line proposed in the present invention simplifies the entire detection process into a standardized operation through the number management and voltage range division of the remote detection control module. The construction personnel only need to adjust the voltage and read the insulation detection data section by section according to the module number and operation process, without having to master complex signal processing or detection technology, which greatly reduces the professional requirements for operators. (3) The present invention proposes a method for diagnosing insulation defects in a T-connected long-distance power supply line, which directly connects a controllable T-type junction box and a remote detection control module to the power supply line, and utilizes the adjustment capability of the local power conversion device and the existing segmented power supply structure. It does not require large-scale modification of the construction plan, thus reducing the amount of line modification work and the construction cost. (4) The present invention proposes a method for diagnosing insulation defects in a T-connected long-distance power supply line. The method adopts a segment-by-segment detection method. After disconnecting the next segment through a controllable T-type junction box, the data of the insulation detection module at the local end is obtained in real time, thereby accurately judging whether the insulation performance of the current segment has defects. When a segment has an insulation performance problem, the system can quickly locate the defective segment, avoiding the inefficient process of traditional manual segment-by-segment testing, and significantly improving the efficiency of line detection; (5) The present invention proposes a method for diagnosing insulation defects in a T-connected long-distance power supply line. The voltage detection ranges of the remote detection control modules do not overlap with each other, thereby avoiding confusion and misjudgment of voltage signals. Combined with the segmented control characteristics of the controllable T-type junction box, it ensures that each detection is only for the current segment, thereby achieving accurate insulation performance evaluation.

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0015] Figure 1 A system schematic diagram of a T-connected long-distance power supply line insulation defect diagnosis method proposed by the present invention; Figure 2 A flowchart of a method for diagnosing insulation defects of a T-connected long-distance power supply line proposed by the present invention; Figure 3 A schematic diagram of terminal equipment of a T-connected long-distance power supply line insulation defect diagnosis method proposed by the present invention; Figure 4 A schematic diagram of a readable storage medium of a T-connected long-distance power supply line insulation defect diagnosis method proposed by the present invention; In the figure, 200-terminal device, 210-memory, 211-RAM, 212-cache memory, 213-ROM, 214-program / utility, 215-program module, 220-processor, 230-bus, 240-external device, 250-I / O interface, 260-network adapter, 300-program product. DETAILED DESCRIPTION

[0016] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with embodiments and drawings. The exemplary implementation modes of the present invention and their description are only used to explain the present invention and are not intended to limit the present invention.

[0017] Example 1 refer to Figure 1, a method for diagnosing insulation defects of a T-connected long-distance power supply line, comprising a local power conversion device, a controllable T-type junction box, and a remote detection control module; The output voltage level of the local power conversion device is used to supply power to the entire line equipment. As the power source of the power supply system, it converts the input AC power or new energy power (such as wind power generation, photovoltaic power generation) into high-voltage DC power and transmits it to the remote end through a transmission cable.

[0018] The local power conversion device outputs high-voltage direct current to provide power to the power supply line, performs insulation performance detection on the power supply line connected to the local end, and the output voltage can be adjusted to meet the voltage range requirements of the remote detection control module, thereby realizing the diagnosis and positioning of insulation performance section by section.

[0019] One end of the controllable T-type junction box is connected to the remote detection control module to power the remote detection control module, and the other end is in a closed state by default to transmit electrical energy to the next segment. The controllable T-type junction box serves as a power transmission switch for the line segment and is responsible for managing the power connectivity between adjacent segments.

[0020] One end of the controllable T-junction box is connected to the remote detection control module to supply power to it and receive control signals; the other end is closed by default to transmit electrical energy to the next segment.

[0021] According to the instruction of the remote detection control module, the connection with the next segment is opened or closed to achieve segmented isolation or connection of the line, thereby cooperating with the insulation detection process.

[0022] The remote detection control module serves as a core control unit for remote line detection and is responsible for monitoring and controlling the state of the controllable T-type junction box according to the input voltage.

[0023] The remote detection control module has an independent built-in voltage detection range to determine whether the input voltage is within the range of responsibility of this module. When the input voltage is within its detection range, the controllable T-junction box is controlled to disconnect the connection with the next segment to ensure that the insulation detection is only for the current segment. The built-in remote power conversion device can convert high-voltage DC power into low-voltage DC power (such as 12VDC, 24VDC, 48VDC) or AC power (such as 220VAC, 380VAC) that is suitable for the needs of this module or other equipment, provide power supply for this module, and assist in the insulation performance diagnosis of each section of the line through the control function.

[0024] The remote detection module controls the controllable T-junction box according to the input voltage level to determine whether to transmit electric energy to the next segment.

[0025] In this embodiment, an insulation detection module is provided in the local power conversion device. The insulation detection module is used for insulation detection of the connection line of the local power conversion device. By detecting the insulation performance of the connection line of the local power conversion device, it is possible to quickly and in real time find out whether the insulation state of the line is abnormal, thereby providing reliable data support for diagnosis. In the section-by-section detection process, the insulation detection module determines whether there is an insulation performance defect by analyzing the insulation condition of the current section, thereby providing a basis for subsequent positioning of the faulty section.

[0026] The remote detection control module is provided with a remote power conversion device, which converts the input voltage level into an output voltage level that adapts to the requirements of other devices or lines to provide power for the remote detection control module.

[0027] There are n controllable T-type junction boxes, and the n T-type junction boxes divide the entire circuit into multiple sections. , , …, ; n said remote detection control modules are connected to n said T-type junction boxes in correspondence, and the controllable T-type junction box connects or separates each section, and each section corresponds to a remote detection control module and a controllable T-type junction box. When it is detected that the insulation performance of a certain section of the line is abnormal, the specific section position can be quickly determined, and the insulation defect can be accurately located. The independence of each section makes the detection result not subject to interference from other sections, ensuring the accuracy of the insulation performance judgment and avoiding misjudgment or missed judgment that may occur in the detection of the entire line. The controllable T-type junction box can disconnect or connect each section with the adjacent section according to the instructions of the remote detection control module, ensuring that only the current section is acted on during the detection, thereby realizing the insulation performance evaluation of each section in the process of adjusting the voltage of the local power supply.

[0028] refer to Figure 2 , the steps of the method are as follows: S1. The remote detection control module determines its independent voltage detection range according to the device number x. When the input voltage is within the detection range of this remote detection control module, the controllable T-junction box is controlled to disconnect from the next segment. The voltage detection range is an independent interval set for each module. By adjusting the output voltage of the local power conversion device, it is ensured that the signal can match a specific module, thereby realizing independent identification and control of the module. In this implementation, a unique signal coding can also be used instead of the voltage range, such as distinguishing modules by frequency or pulse coding.

[0029] S2, from Start detection in sections, define the device number x (x=1, 2, 3...n) as 1, adjust the output voltage of the local power conversion device so that the output voltage falls within the voltage detection range of the remote detection control module x After adjusting the voltage, only the module numbered x can detect the input signal, and the other modules do not respond because the voltage is not within the detection range. In this embodiment, the signal of each line segment can also be collected by distributed sensors without relying on the separate adjustment of the voltage range.

[0030] S3, control the controllable T-junction box x to disconnect Segmented connection ensures that the current detection range is limited to Segmentation, through the switch control function of the T-type junction box, physically isolates the current segment from the undetected segment to prevent current from flowing to the undetected area, thereby achieving the independence of the segment insulation performance evaluation. In this embodiment, a circuit breaker or relay can also be used to achieve segment isolation.

[0031] S4, obtain the insulation detection module data in the adjustable local power conversion device, and determine Whether the segmented insulation performance is defective, the insulation detection module determines whether the line meets the insulation requirements based on electrical characteristics such as leakage current and insulation resistance value. If an abnormality is found, the defect location is prompted. In this embodiment, ultrasonic detection or infrared thermal imaging technology can also be used to judge insulation defects.

[0032] S5. Adjust the output voltage of the local power conversion device so that the output voltage falls within the voltage detection range of the remote detection control module x+1. By utilizing the non-intersection characteristic of the voltage intervals, only the module numbered x+1 responds and automatically completes the takeover of the next module. In this embodiment, seamless switching can also be achieved through the signal forwarding function between modules without voltage adjustment.

[0033] S6, after the controllable T-type junction box x is closed Connect in sections, and the controllable T-junction box x+1 is disconnected The segmented connection dynamically adjusts the segmented connection status of the line to ensure that only one section of the line is added to the detection range, and the entire line detection is gradually completed. In this embodiment, distributed intelligent switching equipment can also be used to achieve automatic switching.

[0034] S7, obtain the insulation detection module data in the adjustable local power conversion device, and determine Whether the insulation performance of the segment is defective is determined based on the detection result of the newly added segment and compared with the data of the previous segment to determine whether insulation performance problems occur after connecting the new segment. This embodiment can also use an intelligent diagnosis algorithm combined with historical data for analysis.

[0035] S8, jump to the next segment, repeat S2, S3, S4, until a segment insulation defect is detected or the entire line detection is completed, and the entire line is covered by segmented step-by-step detection. At the same time, it automatically stops when an abnormality is found to locate the defective area.

[0036] Example 2 refer to Figure 3 Based on Example 1, this example proposes a terminal device for diagnosing insulation defects of a T-connected long-distance power supply line. The terminal device 200 includes at least one memory 210, at least one processor 220, and a bus 230 connecting different platform systems.

[0037] The memory 210 may include a readable medium in the form of a volatile memory, such as a RAM 211 and / or a cache memory 212 , and may further include a ROM 213 .

[0038] The memory 210 also stores a computer program, which can be executed by the processor 220, so that the processor 220 executes the application of any one of the above-mentioned methods for diagnosing insulation defects of T-connected long-distance power supply lines in the embodiments of the present application, and its specific implementation is consistent with the implementation method and the technical effect achieved in the above-mentioned application embodiments, and some contents are not repeated. The memory 210 may also include a program / utility 214 having a set (at least one) of program modules 215, such program modules include but are not limited to: an operating system, one or more application programs, other program modules, and program data, each of these examples or some combination may include the implementation of a network environment.

[0039] Accordingly, the processor 220 may execute the above-mentioned computer programs, and may execute the program / utility 214 .

[0040] The bus 230 may be a bus representing one or more of several types of bus structures, including a memory bus or memory controller, a peripheral bus, an accelerated graphics port, a processor, or a local bus using any of a variety of bus architectures.

[0041] The terminal device 200 may also communicate with one or more external devices 240 such as keyboards, pointing devices, Bluetooth devices, etc., and may also communicate with one or more devices that can interact with the terminal device 200, and / or communicate with any device (such as a router, a modem, etc.) that enables the terminal device 200 to communicate with one or more other computing devices. Such communication may be performed through an I / O interface 250. In addition, the terminal device 200 may also communicate with one or more networks (such as a local area network (LAN), a wide area network (WAN) and / or a public network, such as the Internet) through a network adapter 260. The network adapter 260 may communicate with other modules of the terminal device 200 through a bus 230. It should be understood that, although not shown in the figure, other hardware and / or software modules may be used in conjunction with the terminal device 200, including but not limited to: microcode, device drivers, redundant processors, external disk drive arrays, RAID systems, tape drives, and data backup storage platforms, etc.

[0042] Example 3 refer to Figure 4 This embodiment proposes a computer-readable storage medium for a method for diagnosing insulation defects of a T-connected long-distance power supply line. Instructions are stored on the computer-readable storage medium. When the instructions are executed by a processor, the specific implementation method of implementing any of the above-mentioned methods for diagnosing insulation defects of a T-connected long-distance power supply line is consistent with the implementation method and the technical effect achieved in the above-mentioned application embodiments, and some contents will not be repeated here.

[0043] Figure 4 The program product 300 provided in this embodiment for implementing the above-mentioned application is shown, which can adopt a portable compact disk read-only memory (CD-ROM) and include program code, and can be run on a terminal device, such as a personal computer. However, the program product 300 of the present invention is not limited to this. In this embodiment, the readable storage medium can be any tangible medium containing or storing a program, which can be used by an instruction execution system, device or device or used in combination with it. The program product 300 can adopt any combination of one or more readable media. The readable medium can be a readable signal medium or a readable storage medium. The readable storage medium can be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or device, or any combination of the above. More specific examples of readable storage media (non-exhaustive list) include: an electrical connection with one or more wires, a portable disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above.

[0044] Computer-readable storage media may include data signals propagated in baseband or as part of a carrier wave, wherein readable program codes are carried. Such propagated data signals may take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. The readable storage medium may also be any readable medium other than the readable storage medium, which may send, propagate, or transmit a program used by or in combination with an instruction execution system, an apparatus, or a device. The program code contained on the readable storage medium may be transmitted with any appropriate medium, including but not limited to wireless, wired, optical cable, RF, etc., or any suitable combination of the above. The program code for performing the operation of the present invention may be written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Java, C++, etc., and also conventional procedural programming languages ​​such as "C" language or similar programming languages. The program code may be executed entirely on a user computing device, partially on a user device, as an independent software package, partially on a user computing device, partially on a remote computing device, or entirely on a remote computing device or server. Where a remote computing device is involved, the remote computing device may be connected to the user computing device through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computing device (e.g., through the Internet using an Internet service provider).

[0045] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A method for diagnosing insulation defects in a T-connected long-distance power supply line, characterized in that: It includes a local power conversion device, a controllable T-type junction box, and a remote detection control module; The output voltage level of the local-end power conversion device supplies power to the overall line equipment; One end of the controllable T-junction box is connected to the remote detection control module to supply power to the remote detection control module, and the other end is in a closed state by default to transmit power to the next segment; The remote detection module controls the controllable T-junction box according to the input voltage level to determine whether to transmit electric energy to the next segment.

2. The insulation defect diagnosis method for a T-connected long-distance power supply line according to claim 1 is characterized in that: The local power conversion device is provided with an insulation detection module, and the insulation detection module is used for insulation detection of the connection line of the local power conversion device; The remote detection control module is provided with a remote power conversion device, which converts the input voltage level into an output voltage level that adapts to the requirements of other devices or lines to provide power for the remote detection control module.

3. The insulation defect diagnosis method for a T-connected long-distance power supply line according to claim 2 is characterized in that: There are n controllable T-type junction boxes, and the n T-type junction boxes divide the entire circuit into multiple sections. , , …, The n remote detection control modules are connected to corresponding n T-type junction boxes, and the controllable T-type junction boxes connect or separate the sections.

4. The insulation defect diagnosis method for a T-connected long-distance power supply line according to claim 3 is characterized in that: Here are the steps: S1, the remote detection control module determines its independent voltage detection range according to the device number x, and when the input voltage is within the detection range of the remote detection control module, controls the controllable T-type junction box to disconnect from the next segment; S2, from Start detection in sections, define the device number x as 1, adjust the output voltage of the local power conversion device, so that the output voltage falls within the voltage detection range of the remote detection control module x Inside; S3, control the controllable T-junction box x to disconnect Segmented connections; S4, obtain the insulation detection module data in the adjustable local power conversion device, and determine Whether the segment insulation performance is defective; S5. Adjust the output voltage of the local power conversion device so that the output voltage falls within the voltage detection range of the remote detection control module x+1. Inside; S6, after the controllable T-type junction box x is closed Connect in sections, and the controllable T-junction box x+1 is disconnected Segmented connections; S7, obtain the insulation detection module data in the adjustable local power conversion device, and determine Whether the segment insulation performance is defective; S8, jump to the next segment and repeat S2, S3, S4 until a segment insulation defect is detected or the entire line detection is completed.

5. The insulation defect diagnosis method for a T-connected long-distance power supply line according to claim 4 is characterized in that: The voltage detection range , ,… , There is no intersection between them.

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