Metro line insulator centralized detection system and method

Abstract

The application relates to a centralized detection system and method for subway line insulators. The system comprises an on-site detection module arranged at the grounding end of each insulator on a current collector rail, which is used for in-situ detection of the current change value of the grounding end of the insulator; a receiver in communication connection with the on-site detection module, which is used for receiving the current change value sent by the on-site detection module; a transmitter connected with the current collector rail, which is used for sending a modulated signal to the current collector rail; when the insulator is in failure, the insulator is in conduction, the on-site detection module senses the current change value generated by the modulated signal, and whether the insulator is in failure is judged according to the sensed current change value. The centralized detection of the insulators in the subway line can be realized by adopting the system.

Description

Technical Field

[0001] This application relates to the field of power electronics technology, and in particular to a centralized testing system and method for subway line insulators. Background Technology

[0002] The subway line has insulators connected in series between the current-carrying shoe and the grounding end. During operation, the insulators may fail due to the impact of the current-carrying shoe and their own aging, which may affect the normal operation of the subway. Therefore, centralized testing is required.

[0003] Currently, on-site testing equipment uses series voltage division schemes and is generally designed for AC voltage testing of 35kV and above. This method requires space for the grounding terminal of the insulator, and during retrofitting, the original installation structure needs to be redesigned to make room for the on-site testing module. However, currently, subway line insulators are directly fixed to concrete structures, making retrofitting impractical. DC line leakage current detection typically uses positive and negative current detection to determine the difference. Due to the long length of subway lines and the use of inter-section power supply, power is supplied through the current receiving rail to the car body and then grounded, making it impossible to detect leakage in individual insulators. Therefore, none of the above methods are suitable for centralized testing of insulators on subway lines. Summary of the Invention

[0004] Therefore, it is necessary to provide a centralized testing system and method for subway line insulators to address the aforementioned technical problems.

[0005] A centralized testing system for subway line insulators, the testing system comprising:

[0006] A local detection module is installed at the grounding terminal of each insulator on the current receiving rail, which is used to sense the current change value at the grounding terminal of the insulator.

[0007] A receiver that is communicatively connected to the local detection module, the receiver being used to receive the current change value sent by the local detection module;

[0008] A transmitter, connected to the receiving rail, is used to send a modulated signal to the receiving rail;

[0009] When an insulator fails, the insulator becomes conductive, and the local detection module senses the change in current generated by the modulation signal. Based on the magnitude of the sensed change in current, it determines whether the insulator is faulty.

[0010] In one embodiment, the local detection module includes: a mutual inductance coil and a processing circuit; the mutual inductance coil is used to sense the current change value at the grounding terminal of the insulator; the processing circuit is used to amplify the current change value.

[0011] In one embodiment, when the sensed current change is 0, the insulator is normal; when the sensed current change is less than the current change corresponding to the modulation signal, the insulator is determined to be in a first fault state; when the sensed current change is equal to the current change corresponding to the modulation signal, the insulator is determined to be in a second fault state.

[0012] In one embodiment, the receiver is also connected to a centralized detection module for identifying all faulty insulators on the subway line.

[0013] A centralized inspection method for insulators on subway lines, applied in a centralized inspection system for insulators on subway lines, the method comprising:

[0014] The modulated signal is sent to the receiving track via the transmitter;

[0015] When the insulator on the current-receiving rail is turned on, the grounding terminal of the insulator generates a changing current under the action of the modulation signal;

[0016] The changing current is sensed by the local detection module, and the current change value is obtained. The current change value is then sent to the receiver via communication, so as to determine whether the insulator is faulty based on the magnitude of the sensed current change value.

[0017] In one embodiment, the local detection module includes: a mutual inductance coil and a processing circuit; including: sensing the current change value at the grounding terminal of the insulator through the mutual inductance coil; and amplifying the current change value through the processing circuit.

[0018] In one embodiment, the method further includes: when the sensed current change value is 0, the insulator is normal; when the sensed current change value is less than the current change value corresponding to the modulation signal, the insulator is determined to be in a first fault state; when the sensed current change value is equal to the current change value corresponding to the modulation signal, the insulator is determined to be in a second fault state.

[0019] In one embodiment, the receiver is also connected to a centralized detection module, which identifies all faulty insulators on the subway line to generate a maintenance plan.

[0020] The aforementioned centralized inspection system and method for subway line insulators addresses the problem of centralized inspection of insulators on the current receiving track. On the one hand, it sets up a local detection module at the grounding end of the insulator to sense the change in current at the grounding end of the insulator. On the other hand, it sends a modulation signal through a transmitter to perform active real-time detection. The magnitude of the sensed change in current is used to determine whether the insulator is faulty, thereby enabling centralized inspection of the entire subway line on a regular and periodic basis. Attached Figure Description

[0021] Figure 1 This is a structural block diagram of a centralized detection system for subway line insulators in one embodiment;

[0022] Figure 2 This is a circuit diagram of an on-site detection module in one embodiment. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0024] In one embodiment, such as Figure 1 As shown, a centralized testing system for subway line insulators is provided, comprising:

[0025] A local detection module is installed at the grounding terminal of each insulator on the current receiving rail. This module senses changes in the current at the insulator's grounding terminal. A receiver, connected to the local detection module, receives these current change values. A transmitter, connected to the current receiving rail, sends a modulation signal to the rail. When an insulator fails, it conducts, and the local detection module senses the current change value generated by the modulation signal. The magnitude of the sensed current change value determines whether the insulator is faulty. Specifically, the modulation signal can be sent when the subway is stopped to avoid affecting subway operation.

[0026] It is worth noting that subway lines are long and use a section power supply method. Power is supplied through the current receiving rail to the car body and then grounded. The insulators are connected in parallel between the current receiving rail and the grounding end. If the positive and negative current difference detection method is used, because the insulators of a single section of the line are connected in parallel, with a spacing of about 4 meters between each insulator and a total length of about two kilometers for a single section of the line, the positive and negative current difference detection method cannot detect which insulator is faulty. It can only detect that the insulation of that section is faulty. Therefore, the positive and negative current difference detection method cannot detect and determine the insulation fault of a single insulator in a single section of the line.

[0027] To address the current difficulty in fault detection of insulators on subway tracks, the aforementioned centralized insulator detection system for subway lines is proposed. This system addresses the issue of centralized detection of insulators on current-receiving tracks by, on one hand, installing local detection modules at the insulator grounding terminals to sense changes in current at those terminals; on the other hand, sending modulated signals via a transmitter for active real-time detection. The system determines whether an insulator is faulty based on the magnitude of the sensed current changes, thus enabling periodic and regular centralized detection of the entire subway line.

[0028] It is worth noting that, in order to improve the standby time of the local detection module, a low-power local detection module is adopted. Specifically, the local detection module works when it is woken up and is in sleep mode at other times. In addition, a low-power wireless communication module can be used to further reduce the power consumption when reporting data, thereby greatly improving the standby time of the local detection module.

[0029] In one embodiment, such as Figure 2 As shown, the local detection module includes: a mutual inductance coil and a processing circuit; the mutual inductance coil is used to sense the current change value at the grounding terminal of the insulator; the processing circuit is used to amplify the current change value.

[0030] In one embodiment, when the sensed current change is 0, the insulator is normal; when the sensed current change is less than the current change corresponding to the modulation signal, the insulator is determined to be in a first fault state; when the sensed current change is equal to the current change corresponding to the modulation signal, the insulator is determined to be in a second fault state. In this embodiment, when the current change is 0, it indicates that the insulator's insulation performance is good and it is in a normal state. When the sensed current change is less than the current change corresponding to the modulation signal, the insulator is determined to be in a first fault state. The first fault state refers to an insulator being abnormal, but still in the early stages of the abnormal state. During testing, the fault state of the insulator can be used to determine whether to repair or replace it. The corresponding second fault state indicates complete conduction, requiring replacement.

[0031] Therefore, the detection scheme of the present invention can not only detect which insulators are abnormal, but also discover the possible abnormal states of the insulators, providing a basis for insulator maintenance.

[0032] In one embodiment, the receiver is also connected to a centralized detection module to identify all faulty insulators on the subway line. After determining the status of all insulators, a specific maintenance plan can be determined.

[0033] In one embodiment, a method for centralized testing of insulators on subway lines is provided, comprising:

[0034] The modulated signal is sent to the receiving track via the transmitter;

[0035] When the insulator on the current-receiving rail is turned on, the grounding terminal of the insulator generates a changing current under the action of the modulation signal;

[0036] The changing current is sensed by the local detection module, and the current change value is obtained. The current change value is then sent to the receiver via communication, so as to determine whether the insulator is faulty based on the magnitude of the sensed current change value.

[0037] In one embodiment, the local detection module includes: a mutual inductance coil and a processing circuit; the step of sensing the changing current through the local detection module to obtain the current change value includes: sensing the current change value at the grounding terminal of the insulator through the mutual inductance coil; and amplifying the current change value through the processing circuit.

[0038] In one embodiment, when the sensed current change is 0, the insulator is normal; when the sensed current change is less than the current change corresponding to the modulation signal, the insulator is determined to be in a first fault state; when the sensed current change is equal to the current change corresponding to the modulation signal, the insulator is determined to be in a second fault state.

[0039] In one embodiment, the receiver is also connected to a centralized detection module, which identifies all faulty insulators on the subway line to generate a maintenance plan.

[0040] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. Any references to memory, storage, databases, or other media used in the embodiments provided in this application can include non-volatile and / or volatile memory. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memory can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in various forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), dual data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), Rambus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), etc.

[0041] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0042] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A metro line insulator centralized detection system, characterized in that, The detection system comprises: a local detection module arranged on each insulator grounding end of the current collector rail, the local detection module being used for sensing a current change value of the insulator grounding end; a receiver in communication connection with the local detection module, the receiver being used for receiving the current change value sent by the local detection module; a transmitter connected with the current collector rail, and used for sending a modulated signal to the current collector rail; when the insulator is in failure, the insulator is in conduction, the local detection module senses a current change value generated by the modulated signal, and whether the insulator is in failure is determined according to the sensed current change value; the local detection module comprises a mutual inductor and a processing circuit; the mutual inductor is used for sensing the current change value of the insulator grounding end; the processing circuit is used for amplifying the current change value; the receiver is further connected with a centralized detection module, and is used for determining all failed insulators on the subway line; whether the insulator is in failure is determined according to the sensed current change value, and the determination comprises: when the sensed current change value is 0, the insulator is normal; when the sensed current change value is less than a current change value corresponding to the modulated signal and is not equal to 0, it is determined that the insulator is in a first failure state; when the sensed current change value is equal to the current change value corresponding to the modulated signal, it is determined that the insulator is in a second failure state.

2. A method for centralized detection of metro line insulators, characterized in that, The method is applied to the subway line insulator centralized detection system of claim 1, and the method comprises: sending the modulated signal to the current collector rail through the transmitter; when the insulator on the current collector rail is in conduction, the insulator grounding end generates a change current under the action of the modulated signal; sensing the change current through the local detection module to obtain a current change value, and sending the current change value to the receiver through communication, so as to determine whether the insulator is in failure according to the sensed current change value; the local detection module comprises a mutual inductor and a processing circuit; sensing the change current through the local detection module to obtain a current change value comprises: sensing the current change value of the insulator grounding end through the mutual inductor, and amplifying the current change value through the processing circuit; whether the insulator is in failure is determined according to the sensed current change value, and the determination comprises: when the sensed current change value is 0, the insulator is normal; when the sensed current change value is less than a current change value corresponding to the modulated signal and is not equal to 0, it is determined that the insulator is in a first failure state; when the sensed current change value is equal to the current change value corresponding to the modulated signal, it is determined that the insulator is in a second failure state; the receiver is further connected with a centralized detection module, and all failed insulators on the subway line are determined through the centralized detection module to generate a maintenance scheme.

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