Magnetic type short circuit tool with self-protection function

Abstract

The invention provides a magnetic type short circuit tool with a self-protection function. The magnetic type short circuit tool comprises two magnetic devices, an insulating handle, an automatic protection unit and a short circuit conductor. The two ends of the short-circuit conductor are both provided with the magnetic attraction devices, and the magnetic attraction devices are used for being in magnetic attraction connection with the electrical contact to be short-circuited, so that rapid and reliable non-handheld fixation is realized. And an insulating handle is arranged on the magnetic suction device. Meanwhile, an automatic protection unit is integrated on the short-circuit conductor, and short-circuit current can be automatically cut off or limited when abnormal conditions such as dangerous voltage and abnormal large current are detected, so that the safety of operators and equipment is effectively protected when temporary safe short-circuit operation is carried out in maintenance and repair of the control system and the control equipment.

Description

Technical Field

[0001] This invention belongs to the technical field of testing tools for nuclear power plant protection and control systems, and specifically relates to a magnetic shorting tool with self-protection function. Background Technology

[0002] During the maintenance and testing of nuclear power plant control systems, it is often necessary to short-circuit logic control loops to simulate specific signals triggering system responses. This is especially true during anticipated transient (ATWT) logic verification tests (T2 tests) where an emergency shutdown fails, where terminal blocks or relay contacts are frequently shorted to trigger relevant logic signals and verify whether the system functions correctly.

[0003] Currently, common shorting tools mainly include traditional electrical tools such as jumper wires and alligator clips. These tools typically rely on manual operation or mechanical fixation through simple clamping structures. However, in the high reliability requirements and complex electrical environment of nuclear power plants, these traditional tools have the following significant drawbacks: 1. Unreliable fixing and poor compatibility: Handheld clamps are prone to accidental detachment during prolonged operation or when the operator's attention is distracted, causing short-circuit failure or accidental contact with other terminals, affecting test accuracy and even causing malfunctions. Mechanical fixing tools such as alligator clips have low compatibility with different types of terminals, especially when operating in confined spaces with dense wiring in cabinets, making installation difficult and hindering the quick and accurate completion of short-circuit tasks, thus affecting work efficiency.

[0004] 2. Lack of electrical safety monitoring and active protection mechanisms: Traditional short-circuiting tools are purely mechanical structures and do not possess voltage or current detection capabilities. If a dangerous voltage exists at the short-circuit point before the operation and is not effectively released, or if an abnormally large current occurs in the circuit after the short circuit due to system faults, the tool itself cannot identify such electrical hazards. This not only easily damages the shorted equipment but also poses a risk of electric shock to operators, a serious hidden danger in environments with extremely high safety requirements, such as nuclear power plants.

[0005] Therefore, existing short-circuit tools are insufficient in terms of reliability, ease of use, and safety, making it difficult to fully meet the high standards of operation required by nuclear power plants. There is an urgent need for a short-circuit tool that can reliably fix the circuit, is easy to operate, and possesses electrical condition monitoring and autonomous protection capabilities in hazardous situations, in order to improve the safety and efficiency of testing and maintenance work. Summary of the Invention

[0006] The purpose of this invention is to provide a magnetic short-circuit tool with self-protection function, which can achieve reliable fixation, is convenient and efficient to operate, and can automatically cut off or limit the short-circuit current when abnormal conditions such as dangerous voltage or abnormally large current are detected, effectively protecting the safety of operators and equipment.

[0007] To solve the above-mentioned technical problems, the present invention provides a magnetic shorting tool with self-protection function, comprising: two magnetic suction devices, an insulated handle, an automatic protection unit, and a shorting conductor; The two ends of the shorting conductor are respectively connected to a magnetic attraction device, and the two magnetic attraction devices are respectively used to magnetically connect with the two electrical contacts to be shorted to form a shorting path; The magnetic attraction device is equipped with the insulated handle; The automatic protection unit is connected in series with the short-circuit conductor to monitor the status of the short-circuit path in real time and automatically cut off the current flowing through the short-circuit conductor when an abnormality is detected.

[0008] Optionally, in the above-mentioned magnetic shorting tool, the insulating handle is sleeved on the connection end between the shorting conductor and the magnetic device.

[0009] Optionally, in the above-mentioned magnetic shorting tool, the magnetic device includes a permanent magnet assembly.

[0010] Optionally, in the above-mentioned magnetic shorting tool, the permanent magnet assembly includes a plurality of stacked cylindrical permanent magnets.

[0011] Optionally, in the above-mentioned magnetic shorting tool, the automatic protection unit includes an insulating housing and a safety device disposed in the insulating housing. Both ends of the insulating housing are provided with clearance openings for penetrating the shorting conductor, and the safety device is a fast-acting fuse.

[0012] Optionally, in the above-mentioned magnetic shorting tool, the insulating housing includes two half-shells, one end of the two half-shells is a connecting end and is connected by threads, and the other end of the two half-shells is provided with the clearance opening.

[0013] Optionally, in the above-mentioned magnetic shorting tool, the automatic protection unit further includes a clamping spring, which is sleeved on the shorting conductor and located between the safety device and the inner wall of the insulating housing.

[0014] Optionally, in the above-mentioned magnetic shorting tool, a pressure plate is provided on the connection surface of the safety device and the shorting conductor.

[0015] Optionally, in the above-mentioned magnetic shorting tool, the shorting conductor is a flexible wire made of multiple strands of fine copper or aluminum wire twisted together.

[0016] Optionally, in the above-mentioned magnetic shorting tool, the outer layer of the flexible wire is wrapped with a polyvinyl chloride insulation layer.

[0017] This invention provides a magnetic shorting tool with self-protection function, the advantages of which are: Magnetic attraction devices are installed at both ends of the shorting conductor, allowing for quick and reliable non-handheld fixing by magnetically connecting it to the electrical contacts to be shorted. Simultaneously, an automatic protection unit is integrated into the shorting conductor, which automatically cuts off or limits the short-circuit current when abnormal conditions such as dangerous voltages or abnormally high currents are detected. This effectively protects the safety of operators and equipment during temporary safe short-circuiting operations in the maintenance and repair of control systems and equipment. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0019] Figure 1 A schematic diagram illustrating the working principle of a magnetic shorting tool with self-protection function provided in an embodiment of the present invention; Figure 2 A front view of a magnetic shorting tool with self-protection function provided in an embodiment of the present invention; Figure 3 A top view of a magnetic shorting tool with self-protection function provided in an embodiment of the present invention; Figure 4 A side view of a magnetic shorting tool with self-protection function provided in an embodiment of the present invention; Figure 5 This is a schematic diagram of the structure of the self-protection unit provided in an embodiment of the present invention.

[0020] In the image above: 100 - Magnetic suction device; 200-Insulated Handle; 300 - Self-protection unit; 310 - Insulating housing; 320 - Safety device; 330 - Compression spring; 400 - Short-circuit conductor. Detailed Implementation

[0021] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0022] The core of this invention is to provide a magnetic short-circuit tool with self-protection function, which can achieve reliable fixation, is convenient and efficient to operate, and can automatically cut off or limit the short-circuit current when abnormal conditions such as dangerous voltage or abnormally large current are detected, effectively protecting the safety of operators and equipment.

[0023] To enable those skilled in the art to better understand the technical solutions provided by the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] For details, please refer to Figures 1-5 The present invention provides a magnetic shorting tool with self-protection function, comprising: two magnetic suction devices 100, an insulated handle 200, an automatic protection unit 300, and a shorting conductor 400.

[0025] The core conductive component of the shorting conductor 400 can be a low-resistance, high-current-carrying-capacity wire, used to establish a low-impedance connection path between two electrical contacts or conductors that need to be shorted. Additionally, it increases the flexibility of use and adaptability to different installation positions and angles. Specifically, the shorting conductor 400 is composed of a flexible wire with excellent conductivity to ensure good heat dissipation and fatigue resistance when high currents pass through it.

[0026] A magnetic attraction device 100 is connected to each end of the shorting conductor 400. The two magnetic attraction devices 100 are used to magnetically connect with the two electrical contacts to be shorted, forming a shorting circuit. Specifically, the two ends of the shorting conductor 400 can be reliably electrically connected to the conductive connection ends of the two magnetic attraction devices 100 by fastening them with high-strength bolts.

[0027] The magnetic suction device 100 uses magnetic force to firmly attach the shorting tool to the electrical contact to be shorted, achieving quick and reliable shorting and fixing without handheld operation. To prevent electric shock, the magnetic suction device 100 is equipped with an insulated handle 200 for safe operation by the operator.

[0028] It should be noted that the electrical contacts to be shorted are metal terminals, which can be magnetically attracted to the magnetic attraction device 100. The magnetic attraction device 100 is a core component, and preferably uses a permanent magnet, such as a neodymium iron boron strong magnet.

[0029] The insulated handle 200 can be injection molded from epoxy resin or high-performance engineering plastic. The insulated handle 200 can be designed in terms of its placement and shape on the magnetic device 100 according to actual needs. For example... Figure 2 As shown, the insulated handle 200 covers the magnetic device 100, providing the operator with a safe and stable grip. The surface of the handle may be provided with anti-slip texture to enhance operability.

[0030] The automatic protection unit 300 is key to the self-protection function of this solution. It is connected in series in the path of the short-circuit conductor 400. It is used to monitor the status of the short-circuit path in real time and automatically cut off the current flowing through the short-circuit conductor 400 when an abnormality is detected. The above-mentioned abnormalities include, but are not limited to: dangerous voltage at the short-circuit point (higher than the preset safety threshold: 250V); abnormally large current in the circuit after short-circuiting (exceeding the preset safety threshold: 500mA), etc.

[0031] The magnetic short-circuit tool with self-protection function provided by this invention has magnetic suction devices 100 at both ends of the short-circuit conductor 400. These magnetic suction devices 100 magnetically connect to the electrical contacts to be shorted, achieving quick and reliable non-handheld fixing. Simultaneously, an automatic protection unit 300 is integrated on the short-circuit conductor 400, which can automatically cut off or limit the short-circuit current when abnormal conditions such as dangerous voltage or abnormally high current are detected. This effectively protects the safety of operators and equipment during temporary safe short-circuit operations in the maintenance and repair of control systems and equipment.

[0032] In a specific embodiment, the insulating handle 200 is sleeved on the connection end between the short-circuit conductor 400 and the magnetic suction device 100, ensuring effective isolation between the operator and live parts during operation and placement, while also providing structural protection for the connection position of the short-circuit conductor 400 and the magnetic suction device 100. The insulating handle 200 can be formed by heat-shrinking a plastic sleeve at the connection end between the short-circuit conductor 400 and the magnetic suction device 100, so that part of the insulating handle 200 is tightly sleeved on the outer wall of the short-circuit conductor 400 and another part of the insulating handle 200 is tightly sleeved on the outer wall of the magnetic suction device 100.

[0033] In a specific embodiment, the magnetic attraction device 100 includes a permanent magnet assembly. The magnetic attraction device 100 may also include a housing, a magnetically conductive plate, and an electrode connecting plate. The permanent magnet assembly is mounted inside the housing via a non-magnetically conductive fastener. The magnetically conductive plate, made of low-carbon steel, is attached to the adsorption surface of the permanent magnet assembly to concentrate magnetic lines of force and enhance magnetic attraction. The electrode connecting plate, made of copper or brass, extends one end out of the housing as a conductive connection end for connection with the short-circuit conductor 400, while the adsorption surface of the other end is flush with or slightly protruding from the magnetically conductive plate. This ensures that when connected to an electrical contact, the current primarily flows through the electrode connecting plate, rather than the permanent magnet assembly, thereby preventing irreversible demagnetization damage to the permanent magnet assembly caused by strong current.

[0034] Furthermore, the permanent magnet assembly includes multiple stacked cylindrical permanent magnets. The magnetic attraction devices 100 at both ends can each be composed of three cylindrical permanent magnets with a height of 5 mm and a radius of 3 mm, specifically made of neodymium iron boron material.

[0035] In a specific embodiment, the automatic protection unit 300 includes an insulating housing 310 and a safety device 320 disposed in the insulating housing 310. Both ends of the insulating housing 310 are provided with clearance openings for passing through the short-circuit conductor 400. The safety device 320 is a fast-acting fuse.

[0036] As an optional implementation, the insulating housing 310 can be a housing made of PVC material, providing an external structure for the self-protection unit while also providing insulation protection. The fuse 320 can be an integrated fast-acting fuse for automatic protection in case of abnormal current or voltage. The fuse 320 is directly connected in series with the short-circuiting conductor 400 and contains a fuse wire. Within the normal short-circuit current range, the fuse will not trip. In the event of an abnormal overload or short circuit, the large fault current will cause the fuse element to melt and vaporize in a very short time, thereby cutting off the circuit. The fuse 320 may include a nickel-plated copper cap, a transparent glass tube, and a lead-antimony alloy fuse wire. The fuse in the fuse 320 is typically made of specific materials to ensure that it can melt and trip in the event of an overload or short circuit, thereby cutting off the circuit protection equipment and wiring.

[0037] In a further specific embodiment, the insulating housing 310 includes two half-shells, one end of which is a connecting end and is connected by threads, and the other end of which is provided with a clearance opening. The design of the half-shell structure makes the assembly and maintenance of the equipment more convenient.

[0038] When the two half-shells are connected by threads, they can be easily separated and reassembled, which is very advantageous for the installation, replacement, or inspection of internal components. For example... Figure 5 As shown, the two half-shells can be connected by threads to form a cylindrical structure.

[0039] To prevent the protection device 320 from shaking inside the insulating housing 310, the automatic protection unit 300 also includes a compression spring 330, which is sleeved on the short-circuiting conductor 400 and located between the protection device 320 and the inner wall of the insulating housing 310.

[0040] In a specific embodiment, a pressure plate is provided at the connection surface between the safety device 320 and the shorting conductor 400. The clamping spring 330 clamps the pressure plate to ensure full contact between the flexible wire and the safety device 320. The clamping spring 330 applies a continuous, directional pressure to the pressure plate, which then transmits this pressure to the safety device 320 connected to the shorting conductor 400. This mechanical pressure is ultimately converted into contact pressure between the electrical connection interfaces, which can resist vibrations and impacts generated during equipment operation, as well as thermal expansion and contraction of materials due to current switching, preventing the connection from loosening.

[0041] In a specific embodiment, the shorting conductor 400 is a flexible wire, which increases the flexibility of use and adaptability to different installation positions and angles. Specifically, the shorting conductor 400 is a flexible wire made of multiple strands of fine copper or aluminum wire twisted together, and the outer layer of the flexible wire is wrapped with a polyvinyl chloride insulation layer. The withstand voltage rating is 600V.

[0042] The workflow of this invention is as follows: 1. Work preparation The operator uses a digital multimeter to check and confirm that the on-resistance of the shorting tool meets the requirements (<0.5W).

[0043] 2. Adsorption and fixation The operator holds the insulated handle 200 and brings the magnetic device 100 at one end of the magnetic shorting tool close to and attaches it to the first target metal contact A. After confirming a reliable connection, the operator then attaches the magnetic device 100 at the other end of the magnetic shorting tool to the second target metal contact B.

[0044] 3. Short-circuit establishment Once the two ends of the magnetic shorting tool form a stable mechanical and electrical connection through magnetic force, a shorting path is then established through the shorting conductor 400.

[0045] 4. Real-time monitoring and protection When the self-protection unit detects an abnormal current (current exceeding 500mA or voltage exceeding 250V), it immediately cuts off the main circuit to protect the equipment and personnel safety.

[0046] The beneficial effects of the technical solution provided by this invention include: 1. Revolutionary improvement in safety performance: Active protection: The integrated self-protection unit can detect dangerous voltages and abnormal high currents in real time and automatically cut off the current within milliseconds, fundamentally avoiding equipment damage and electric shock accidents, and greatly protecting the personal safety of operators.

[0047] 2. Convenient and efficient operation: Magnetic quick fixation: It uses magnetic force to achieve "one-touch fixation", eliminating the tedious steps of traditional mechanical fixation (such as tightening screws), and is especially suitable for scenarios with narrow spaces or requiring rapid operation, greatly improving work efficiency.

[0048] Hands-free: After adsorption, there is no need for continuous manual holding, freeing the operator's hands to perform other tasks, reducing fatigue and the possibility of errors.

[0049] 3. Secure and reliable: Strong magnetic force ensures that the tool is firmly attached during the shorting process and is not easily dislodged due to vibration or accidental contact, thus ensuring the continuous effectiveness of the shorting. In the description of this application, "multiple" means two or more. If "first" or "second" is mentioned, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or the order of the technical features indicated.

[0050] As indicated in this application and claims, unless the context clearly indicates otherwise, the words "a," "an," "a," and / or "the" are not specifically singular and may include the plural. Generally, the terms "comprising" and "including" only indicate the inclusion of expressly identified steps and elements, which do not constitute an exclusive list, and the method or apparatus may also include other steps or elements. An element defined by the phrase "comprising an..." does not exclude the presence of other identical elements in the process, method, product, or apparatus that includes the element.

[0051] In the description of the embodiments of this application, unless otherwise stated, " / " means "or", for example, A / B can mean A or B; "and / or" in this document is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Furthermore, in the description of the embodiments of this application, "multiple" refers to two or more.

[0052] In the description of this application, unless otherwise expressly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.

[0053] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0054] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. It should be noted that those skilled in the art can make several improvements and modifications to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A magnetic shorting tool with self-protection function, characterized in that, include: Two magnetic suction devices (100), an insulated handle (200), an automatic protection unit (300), and a short-circuiting conductor (400). The two ends of the shorting conductor (400) are respectively connected to a magnetic attraction device (100), and the two magnetic attraction devices (100) are respectively used to magnetically connect with the two electrical contacts to be shorted to form a shorting path; The magnetic suction device (100) is provided with the insulating handle (200). The automatic protection unit (300) is connected in series with the short-circuit conductor (400) to monitor the status of the short-circuit path in real time and automatically cut off the current flowing through the short-circuit conductor (400) when an abnormality is detected.

2. The magnetic shorting tool according to claim 1, characterized in that, The insulating handle (200) is sleeved on the connection end of the short-circuiting conductor (400) and the magnetic attraction device (100).

3. The magnetic shorting tool according to claim 1, characterized in that, The magnetic attraction device (100) includes a permanent magnet assembly.

4. The magnetic shorting tool according to claim 3, characterized in that, The permanent magnet assembly includes multiple stacked cylindrical permanent magnets.

5. The magnetic shorting tool according to claim 1, characterized in that, The automatic protection unit (300) includes an insulating housing (310) and a safety device (320) disposed in the insulating housing (310). Both ends of the insulating housing (310) are provided with clearance openings for passing through the short-circuit conductor (400). The safety device (320) is a fast-acting fuse.

6. The magnetic shorting tool according to claim 5, characterized in that, The insulating housing (310) includes two half-shells, one end of which is a connecting end and is connected by a thread, and the other end of which is provided with the clearance opening.

7. The magnetic shorting tool according to claim 5, characterized in that, The automatic protection unit (300) also includes a compression spring (330), which is sleeved on the short-circuit conductor (400) and located between the safety device (320) and the inner wall of the insulating housing (310).

8. The magnetic shorting tool according to claim 7, characterized in that, The connection surface between the safety device (320) and the shorting conductor (400) is provided with a pressure plate.

9. The magnetic shorting tool according to claim 1, characterized in that, The short-circuit conductor (400) is a flexible wire made of multiple strands of fine copper or aluminum wires twisted together.

10. The magnetic shorting tool according to claim 9, characterized in that, The outer layer of the flexible conductor is wrapped with a polyvinyl chloride insulation layer.

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