Subway contact net wireless checking and discharging rod

Abstract

The utility model provides a subway contact net wireless check and discharge stick, subway contact net wireless check and discharge stick includes: pole body, the part of pole body front end near contact net is covered insulating material, the most front end of pole body includes the suspension component, the suspension component can make pole body hang on subway contact net, check and discharge unit, install in the front part of pole body and carry out check and discharge operation, measurement terminal, integrate in check and discharge unit, monitor contact net residual voltage, discharge current to judge normal pressure, ground wire, one end of ground wire is connected in the grounding end of check and discharge unit, the other end is fixed device, the fixed device makes ground wire reliable grounding, handheld terminal, the handheld terminal receives the signal transmission from check and discharge unit, and sends the instruction to check and discharge unit.

Description

Technical Field

[0001] This invention relates to a wireless discharge tester, specifically a wireless discharge tester for subway overhead contact lines. Background Technology

[0002] In the maintenance of subway overhead contact systems during power outages, existing technologies face a series of safety and efficiency problems caused by improper handling of residual voltage in the contact network. Currently, when subway power supply contact networks are maintained after power outage isolation, some lines often retain high voltages, sometimes exceeding 1000V. This phenomenon is particularly common in older subway projects. The formation mechanism of such high residual voltage is complex. On the one hand, severe weather (such as humidity and thunderstorms) may cause a decline in the insulation performance of the contact network, making it difficult for the charge to dissipate quickly. On the other hand, it may stem from aging issues within the power supply system itself, such as aging of cable insulation layers and accumulation of capacitance effects, resulting in the contact network still storing a large amount of charge after a power outage. To address the above residual voltage problem, existing technologies mainly employ static voltage reduction or suspending multiple traditional voltage detectors to wait for the residual voltage to decrease naturally, or directly suspending grounding devices to forcibly reduce the voltage to ground. However, these methods have significant technical drawbacks: traditional voltage detectors often use a wired connection structure, which not only poses a risk of "cross-current" accidents during operation but also requires close manual contact with live conductors for wiring, greatly increasing the risk of electric shock for operators. When using grounding devices to forcibly reduce voltage, the residual voltage of the contact network may be as high as kilovolts or more, and the instantaneous discharge will produce strong arcing and sparking phenomena, causing electrical damage to the contact network equipment and potentially leading to serious faults such as insulation breakdown. From the perspective of operational efficiency, the shortcomings of existing technologies are even more prominent. The time for static voltage reduction is significantly affected by factors such as environmental humidity and temperature, often requiring tens of minutes or even longer. For maintenance operations that require time, especially emergency repairs, this greatly compresses the effective working time, forcing maintenance personnel to hastily complete maintenance tasks within a limited time, increasing the risk of operational errors. While suspending multiple voltage detectors can accelerate the reduction of residual voltage to some extent, the installation and removal of the detectors is cumbersome, and the parallel operation of multiple devices can easily lead to wiring confusion, thus prolonging the preparation time. Furthermore, existing technologies often employ fixed structures for insulating rods, with a fixed extension length that is inconvenient to store. During high-altitude overhead contact line work, operators must frequently adjust their positions, impacting work efficiency and posing stability issues due to the excessive length of the rods. Additionally, current technologies lack intelligent monitoring and safety control mechanisms for the discharge process. When the contact line is accidentally attached to a live line, traditional voltage detectors cannot automatically identify the normal pressure state and block the discharge channel, potentially leading to live-line work accidents. During discharge, if the current exceeds a safety threshold (e.g., 20mA), existing devices cannot automatically disconnect the line, posing a dual risk of equipment overload damage and electric shock to personnel. These technological shortcomings prevent current maintenance operations from effectively guaranteeing both safety and reliability. Utility Model Content

[0003] This invention provides an insulated and retractable wireless test bar for subway contact networks, aiming to address the safety and efficiency issues faced by existing technologies.

[0004] This utility model provides a wireless discharge tester for subway contact networks, the wireless discharge tester for subway contact networks comprising:

[0005] The pole body has an insulating material covering the front end of the pole body near the contact wire, and the front end of the pole body includes a suspension component that enables the pole body to be suspended from the subway contact wire.

[0006] A discharge detection unit is installed at the front of the rod to perform voltage detection and discharge operations.

[0007] The measuring terminal, integrated within the discharge detection unit, monitors the residual voltage and discharge current of the contact network and performs normal voltage judgment.

[0008] A grounding wire, one end of which is connected to the grounding terminal of the discharge detection unit, and the other end is a fixing device that enables the grounding wire to be reliably grounded;

[0009] The handheld terminal receives signals transmitted from the discharge detection unit and sends instructions to the discharge detection unit.

[0010] In one embodiment, the rod body adopts a multi-section nested sleeve structure, and each sleeve section is fixed in its extended position by a friction locking device.

[0011] In one embodiment, the length of the pole when fully extended is greater than 5 meters.

[0012] In one embodiment, the length of the rod when fully retracted is less than 1.2 meters.

[0013] In one embodiment, the handle of the rod is wrapped with a non-slip insulating rubber sleeve.

[0014] In one embodiment, the suspension component at the top of the rod is a metal hook, the surface of which is covered with an insulating material.

[0015] In one embodiment, the discharge detection unit further includes a high residual voltage discharge module and a low residual voltage discharge module.

[0016] In one embodiment, the length of the portion of the pole near the contact wire is 2 meters.

[0017] In one embodiment, the discharge detection unit is mounted on the front end of the rod via an insulating clip.

[0018] In one embodiment, the fixing device at the other end of the grounding wire is a rail grounding clamp.

[0019] In one embodiment, the handheld terminal includes a microcontroller control module. The signal output terminal of the microcontroller control module is connected to a wireless communication chip via an SPI bus. The wireless communication chip establishes an RF link with the wireless receiving module of the measurement terminal. The ROM of the microcontroller control module contains a discharge control instruction set for generating a two-stage discharge trigger signal. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of a wireless discharge tester for subway contact networks according to this utility model;

[0021] Figure 2 This document is a schematic diagram illustrating a usage scenario for a wireless test strip on a subway overhead contact line.

[0022] Figure label:

[0023] 1- Rod;

[0024] 11-Suspension components;

[0025] 2-Discharge testing unit;

[0026] 3-Grounding wire;

[0027] 31-Fixing device;

[0028] 4-Handheld terminal;

[0029] 5-Contact wire;

[0030] 6-Rail. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the utility model and are not intended to limit the utility model.

[0032] Furthermore, it should be noted that, unless otherwise explicitly specified and limited, terms such as “installation,” “connection,” and “linkage” used in the description of this application should be interpreted broadly. For example, a connection can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; or it can be a connection within two components. Those skilled in the art can understand its specific meaning in this application according to the specific circumstances.

[0033] Figure 1 This is a schematic diagram of the overall structure of a wireless discharge tester for subway contact networks according to this utility model. Figure 1As shown, this utility model provides a wireless discharge tester for subway contact networks, the wireless discharge tester for subway contact networks comprising:

[0034] The pole 1 has an insulating material covering the front end of the pole 1 near the contact wire 5. The front end of the pole 1 includes a suspension component 11, which enables the pole 1 to be suspended on the subway contact wire 5.

[0035] In this preferred embodiment, the rod 1 adopts a multi-section nested sleeve structure, and each section of the sleeve is fixed in its extended position by a friction locking device.

[0036] In this preferred embodiment, the length of the pole 1 after it is fully extended is greater than 5 meters.

[0037] In this preferred embodiment, the length of the rod 1 after it is fully retracted is less than 1.2 meters.

[0038] In this preferred embodiment, the length of the portion of the pole 1 near the contact wire 5 is 2 meters.

[0039] In this preferred embodiment, the handle of the rod 1 is wrapped with a non-slip insulating rubber sleeve.

[0040] In this preferred embodiment, the suspension component 11 at the top of the rod 1 is a metal suspension hook, and the surface of the metal suspension hook is covered with insulating material.

[0041] The discharge detection unit 2 is installed at the front of the rod 1 and performs the voltage detection and discharge operations.

[0042] In this preferred embodiment, the discharge detection unit 2 further includes a high residual voltage discharge module and a low residual voltage discharge module.

[0043] In this preferred embodiment, the discharge detection unit 2 is installed at the front end of the rod body 1 via an insulating buckle.

[0044] The measuring terminal, integrated into the discharge detection unit 2, monitors the residual voltage and discharge current of the contact network 5 and performs normal voltage judgment.

[0045] Grounding wire 3, one end of which is connected to the grounding terminal of the discharge detection unit 2, and the other end is a fixing device 31, which enables the grounding wire 3 to be reliably grounded;

[0046] In this preferred embodiment, the fixing device 31 at the other end of the grounding wire 3 is a rail grounding clamp.

[0047] The handheld terminal 4 receives signals transmitted from the discharge detection unit 2 and sends instructions to the discharge detection unit 2.

[0048] In this preferred embodiment, the handheld terminal 4 is equipped with a microcontroller control module. The signal output terminal of the microcontroller control module is connected to the wireless communication chip via the SPI bus. The wireless communication chip establishes an RF link with the wireless receiving module of the measurement terminal. The ROM of the microcontroller control module contains a discharge control instruction set, which is used to generate a two-stage discharge trigger signal.

[0049] Figure 2 This document is a schematic diagram illustrating a usage scenario for a wireless test strip on a subway overhead contact line. Figure 2 As shown, in a preferred embodiment, the operator carries a 1.2-meter-long wireless discharge tester for the subway contact network to the location of the subway contact network 5. The operator first clamps the fixing device 31 at one end of the grounding wire 3 onto the rail 6, and then stretches the multi-section nested rod of the wireless discharge tester rod 1, making the overall length of the rod reach 5 meters. The rod 1 is suspended on the contact network 5 by the suspension component 11 at its front end. The part of the rod 1 near the contact network is covered with insulating material to ensure safety. Subsequently, the handheld terminal 4 establishes a wireless connection with the discharge tester unit 2, and the measuring terminal begins to monitor the residual voltage and discharge current of the contact network 5. When the residual voltage is greater than 300V, the handheld terminal 4 sends a command to activate the high residual voltage discharge module in the discharge tester unit 2, forming a discharge circuit through the grounding wire; when the residual voltage drops below 300V, it automatically switches to the low residual voltage discharge module to continue working until the residual voltage drops to the safety threshold. During this process, the measuring terminal continuously performs normal pressure judgment. If the voltage of contact network 5 is detected to reach the normal pressure value, the discharge channel will be immediately locked. At the same time, if the discharge current exceeds the safe range, the protection mechanism will be triggered to cut off the circuit. Throughout the operation, the handheld terminal receives and displays the signals transmitted by the discharge detection unit in real time, realizing remote control and status monitoring of the discharge detection operation.

[0050] This utility model has the following beneficial effects:

[0051] 1. Improved safety: The wireless control method eliminates the need for operators to have close contact with live parts, avoiding the risk of electric shock associated with traditional wiring operations and ensuring the safety of operators.

[0052] 2. Improved work efficiency: The pole adopts a multi-section nested telescopic structure, which not only meets the length requirements of the operation but also facilitates storage, reducing the position adjustment problems caused by the fixed pole during operation and improving work efficiency. A suspension component is set at the top of the pole, which can directly suspend the electric detector rod to the contact network, avoiding the cumbersome installation and disassembly problems of traditional electric detectors and simplifying the operation process.

[0053] 3. The overall structural design enables intelligent monitoring and safety control of the discharge process. When normal pressure or overcurrent is detected, the discharge channel can be automatically locked, ensuring operational safety and reliability. The two-stage discharge module and the normal pressure judgment mechanism of the measuring terminal prevent arcing and sparking during discharge, avoiding electrical damage to the overhead contact line equipment. The measuring terminal monitors residual voltage and discharge current in real time and feeds them back to the handheld terminal, accurately determining the discharge status, reducing the waiting time required for traditional static voltage reduction, and shortening maintenance cycles.

[0054] The embodiments described above are merely further illustrations of the present invention and are not intended to limit the present invention in any other way. The present invention may have many other embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding modifications and changes based on the present invention, but all such modifications and changes should fall within the protection scope of the present invention.

[0055] In the description of this application, it should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. For ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0056] It should be noted that, in this application, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. It should also be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Furthermore, features described with reference to certain examples may be combined in other examples.

[0057] The above embodiments are provided for those skilled in the art to implement or use this application. Those skilled in the art can make various modifications or changes to the above embodiments without departing from the spirit of this application. Therefore, the scope of protection of this application is not limited to the above embodiments, but should be the maximum scope that conforms to the innovative features mentioned in the claims.

Claims

1. A wireless test strip for subway overhead contact lines, characterized in that, The wireless discharge tester for the subway overhead contact system includes: The pole body has an insulating material covering the front end of the pole body near the contact wire, and the front end of the pole body includes a suspension component that enables the pole body to be suspended from the subway contact wire. A discharge detection unit is installed at the front of the rod to perform voltage detection and discharge operations. The measuring terminal, integrated within the discharge detection unit, monitors the residual voltage and discharge current of the contact network and performs normal voltage judgment. A grounding wire, one end of which is connected to the grounding terminal of the discharge detection unit, and the other end is a fixing device that enables the grounding wire to be reliably grounded; The handheld terminal receives signals transmitted from the discharge detection unit and sends instructions to the discharge detection unit.

2. The wireless test strip for subway contact networks according to claim 1, characterized in that, The rod body adopts a multi-section nested sleeve structure, and each section of the sleeve is fixed in its extended position by a friction locking device.

3. The wireless test strip for subway contact networks according to claim 2, characterized in that, The pole is more than 5 meters long when fully extended.

4. The wireless test strip for subway contact networks according to claim 2, characterized in that, The length of the rod is less than 1.2 meters when fully retracted.

5. The wireless test strip for subway contact networks according to claim 1, characterized in that, The handle of the pole is wrapped with a non-slip, insulating rubber sleeve.

6. The wireless test strip for subway contact networks according to claim 1, characterized in that, The suspension component at the top of the pole is a metal hook, and the surface of the metal hook is covered with insulating material.

7. The wireless test strip for subway contact networks according to claim 1, characterized in that, The discharge detection unit also includes a high residual voltage discharge module and a low residual voltage discharge module.

8. The wireless test strip for subway contact networks according to claim 1, characterized in that, The discharge detection unit is installed at the front end of the rod body via an insulating clip.

9. The wireless test strip for subway contact networks according to claim 1, characterized in that, The fixing device at the other end of the grounding wire is a rail grounding clamp.

10. The wireless test strip for subway contact networks according to claim 1, characterized in that, The handheld terminal is equipped with a microcontroller control module. The signal output terminal of the microcontroller control module is connected to a wireless communication chip via an SPI bus. The wireless communication chip establishes an RF link with the wireless receiving module of the measurement terminal. The ROM of the microcontroller control module contains a discharge control instruction set, which is used to generate a two-stage discharge trigger signal.

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