Safety protection tool for cable inspection and repair

Abstract

Provide a safety protection tool for cable inspection and repair that improves usability during inspection and repair and ensures personal safety. 【Solution means】The safety protection tool for cable inspection and repair includes a common grounding device 2 and a plurality of safety protection devices, and the common grounding device is provided with wiring terminals. The common grounding device is for connecting each of the safety protection devices via the wiring terminals. The safety protection device is for connecting each cable head.

Description

[Technical field]

[0001] The present invention relates to the technical field of special tools for equipment inspection and repair, and in particular to a safety protection tool for cable inspection and repair. [Background technology]

[0002] When inspecting and repairing electrical equipment, it is often necessary to loosen the connecting cable heads of electrical equipment (motors, transformers, switchgear, etc.) in connection with certain operations.

[0003] In order to prevent electric shock accidents to workers, the inspection and repair work procedures usually require that the three unwound exposed cable heads be bundled with another soft copper wire (forming a three-phase short circuit) and then the cables and the common grounding device be pulled out (forming grounding). The above operation is not easy because the three-phase cables have different protruding lengths and some cables are thick and hard.

[0004] The reason for this regulation is obviously to ensure the principle of prioritizing human safety. However, from the viewpoint of electrical principles, this type of operation is extremely inconvenient for the switchgear. If the power switch is turned on by mistake, it is equivalent to a direct short circuit switch-on, which will inevitably cause serious damage to the switch and pose a danger to the upper power supply. It will lead to various serious consequences, such as cross-level tripping and uncontrollable expansion of the scope of power outage losses. In fact, similar incidents have occurred in many power companies.

[0005] Currently, the inspection and repair regulations further require that the exterior of the cable head that is three-phase short-circuited with the soft copper wire be completely wrapped with insulating tape so that no metal conductive parts are allowed to be exposed. This ensures psychological safety, but in fact it brings about new dangers.

[0006] At present, since the quality of the insulating tape is very good, the process of removing the tape after inspection and repair is very time-consuming. In addition, after the insulating adhesive of the insulating tape adheres to the surface of the terminal of the taped cable, it becomes difficult to clean, the conductivity of the cable terminal deteriorates, and abnormal heating due to poor contact frequently occurs in the later stage.

[0007] Therefore, it is necessary to design a device that is simple, not complicated to manufacture, easy to use, can protect personal safety as described above, balance with equipment safety, and avoid the above-mentioned adverse effects.

[0008] Therefore, how to provide a safety protection tool for cable inspection and repair that is easy to use and can guarantee personal safety at the same time is a technical problem that those skilled in the art should solve.

Summary of the Invention

Problems to be Solved by the Invention

[0009] The present invention provides a safety protection tool for cable inspection and repair, and solves the technical problems in the prior art that the safety protection tool for cable inspection and repair is not easy to use and danger may occur to the cable.

Means for Solving the Problems

[0010] To achieve the above object, the present invention provides a safety protection tool for cable inspection and repair, which includes a common grounding device and a plurality of safety protection devices. The common grounding device is provided with wiring terminals, among which, the common grounding device is for connecting each of the safety protection devices through the wiring terminals, and the safety protection device is for connecting each cable head.

[0011] Furthermore, the safety protection device is a composite safety protection cap, and the composite safety protection cap is composed of an inner layer metal conductive material and an outer layer insulating material.

[0012] Furthermore, it further includes a current-limiting live warning device, and the current-limiting live warning device is connected in series via a conductive cord between the common grounding device and each safety protection device.

[0013] Furthermore, the current-limiting live warning device consists of a current-limiting impedance and an audible / visual warning device, and the current-limiting impedance and the audible / visual warning device are electrically connected in series.

[0014] Furthermore, the metal liner of the composite safety protection cap is embedded with a corrugated elastic copper sheet.

Advantages of the Invention

[0015] Compared with the prior art, the present invention has the following beneficial effects. The present invention provides a safety protection tool for cable inspection and repair, which includes a common grounding device and a plurality of safety protection devices. The common grounding device is provided with wiring terminals. Among them, the common grounding device is for connecting each of the safety protection devices through the wiring terminals, and the safety protection device is for connecting each cable head. With the above tool, it is convenient during inspection and repair, and at the same time, personal safety can be protected.

Brief Description of the Drawings

[0016]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Embodiments for Carrying Out the Invention

[0017] The following specific embodiments of the present invention will be described in more detail in relation to the accompanying drawings and embodiments. The following embodiments are used to explain the present invention, but are not intended to limit the scope of the present invention.

[0018] In the description of the present application, the directions or positional relationships indicated by terms such as "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, and are only for facilitating the description of the present invention, and do not indicate or imply that the indicated device or element must be configured and operated in a specific orientation or a specific orientation, and it should be understood that the present invention is not limited.

[0019] The terms "first" and "second" are used only for the purpose of description, and it cannot be understood that they indicate or imply relative importance or implicitly indicate the number of indicated technical features. Thus, the features limited by "first" and "second" can explicitly or implicitly include one or more of those features. In the description of the present application, the meaning of "a plurality" is two or more unless otherwise specified.

[0020] In the description of the present application, it should be noted that the terms "mount", "connect", and "couple" should be understood in a broad sense unless there are specific explicit regulations or limitations. For example, there are fixed connections, detachable connections, or integral connections, mechanical connections or electrical connections, direct connections or indirect connections via an intermediate medium, and connections within two elements may also be possible. For those skilled in the art, the specific meanings of the above terms in the present application can be understood in specific cases.

[0021] The present invention provides a safety protection tool for cable inspection and repair, comprising a common grounding device 2, a current-limiting live warning device 3 connected in series in the middle of a conductive cord 9, and a composite safety protection cap 4 made of an inner layer metal conductive material and an outer layer insulating material. This device has a simple mechanical structure and is easy to use. In actual application, it can prevent operators from accidentally touching the electrified cable head, and can avoid various consequences of causing a short circuit by misoperating the switch, and has a reliable protection effect on personal and equipment safety. Furthermore, the current-limiting live warning device 3 is configured such that a current-limiting impedance 5 and an audible / visible warning device 6 are electrically connected in series. When the cable head is accidentally electrified, it can emit an alarm by making a sound or flashing. Caution is given not to touch nearby constructors (Caution is given not to approach nearby constructors).

[0022] Furthermore, the outside of the composite safety protection cap 4 is made of an insulating material to ensure the safety of personnel during operation. The metal liner 8 is embedded with a corrugated elastic copper piece to ensure stable and reliable contact when the wiring terminal 1 is inserted into the composite safety protection cap 4.

[0023] This invention also has the following advantages. (1) It can not only protect personal safety, but also consider the safety protection of switching equipment. (2) When the switch is accidentally turned on, a power short-circuit trip accident can be avoided. (3) When removing the tape, it is not necessary to clean the surface insulating adhesive of the wiring terminal 1. (4) It is convenient for testing the insulation of the cable and the withstand voltage test of the cable. Just by removing the corresponding phase of the safety protection cap, it can be tested. (5) The operation and use are simple.

[0024] The above-mentioned tool includes a common grounding device 2 and a plurality of safety protection devices. The common grounding device 2 is provided with wiring terminals. The grounding device 2 is for connecting each of the safety protection devices via the wiring terminals. The safety protection devices are for connecting each cable head. The safety protection device is a composite safety protection cap 4 composed of an inner layer metal conductive material and an outer layer insulating material. The above-mentioned tool further includes a current-limiting live warning device 3. The current-limiting live warning device 3 is connected in series between the common grounding device 2 and each safety protection device via a conductive cord. The current-limiting live warning device 3 includes a current-limiting impedance 5 and an audible-visual warning device 6. The current-limiting impedance 5 and the audible-visual warning device 6 are electrically connected in series. A wavy elastic copper piece is embedded in the metal liner 8 of the composite safety protection cap 4.

[0025] Next, with reference to FIGS. 1 to 5, the operation of the safety protection tool for cable inspection and repair according to the embodiments of the present application will be described.

[0026] FIG. 1 is an image of a cable head in an inspection and repair state.

[0027] In the electrical inspection and repair regulations, in order to prevent electric shock accidents of operators, during inspection and repair, the three exposed cable heads disassembled are bundled with soft copper wires (forming a three-phase short circuit), and the cable and the common grounding device 2 are drawn out (forming a ground). The entire exterior is completely wrapped with insulating tape. (Not shown)

[0028] FIG. 2 shows the safety protection tool for cable inspection and repair.

[0029] As can be seen from the figure, the metal conductive liners 8 of the three composite safety protection caps 4 are drawn out using a conductive cord 9. After passing through their respective current-limiting live warning devices 3, the three are integrally connected and drawn out to one common grounding device 2.

[0030] FIG. 3 is an enlarged view of the current-limiting live warning device 3.

[0031] The current-limiting live warning device 3 is installed in series in the middle of the conductive cord. Both ends are electrically connected to the conductive cord 9 of the composite safety protection cap 4 and the cord of the grounding point 10 respectively. The current-limiting impedance 5 in the current-limiting live warning device 3 is limited so that no dangerous large current that threatens the safety of the switching device will occur even when a short-circuit switch-on occurs. Also, when the cable head is live, the audible / visual warning device 6 generates an alarm sound and / or a flash to alert nearby operators that this cable is live and they should not touch it (should not approach).

[0032] The audible / visual warning device 6 uses existing technology, and the explanation of its principle is omitted here.

[0033] Figure 4 is a structural diagram of the composite safety protection cap 4.

[0034] The outer layer of the composite safety protection cap 4 is the insulating housing 7 to ensure the personal safety during operation. The metal liner 8 is made of a metal conductive material (the hatched part in Figure 4) and is led out through the conductive cord 9 respectively. To ensure contact, a wavy elastic copper piece similar to the internal structure of a household electrical outlet is also provided inside the metal liner 8 (not shown here for simplicity). Since it does not belong to the core content of the present invention, it will not be described here either.

[0035] The appearance of the composite safety protection cap 4 is kindly designed in different so-called "phase colors" of yellow, green, and red, making it easy to match the phase sequence when restarting the wiring.

[0036] Figure 5 is an image of the cable head inspection and repair safety protection tool installed in the working position.

[0037] In accordance with the procedures required by the safety operation regulations, first securely connect the common grounding terminal of the cable head inspection and repair safety protection tool and the grounding terminal of the cable lead to the approved grounding point 10. Hold the three composite safety protection caps 4 of the cable head inspection and repair safety tool by the insulating housing 7 and "attach" them to the three exposed cable heads respectively. Adjust the length of the conductive cord 9 so that its metal liner 8 does not loosen, and ensure electrical contact with the cable head to complete the installation.

[0038] Please note that the removal procedure is the reverse of the above installation procedure. The removal procedure is very convenient.

[0039] By applying the above technology, a safety protection tool for cable inspection and repair is provided, which includes a common grounding device 2 and a plurality of safety protection devices. The common grounding device 2 is provided with wiring terminals. Here, the common grounding device 2 is for connecting each of the safety protection devices via the wiring terminals, and the safety protection device is for connecting each cable head. These tools improve the usability during inspection and repair and ensure personal safety.

[0040] Finally, it should be noted that the above embodiments are for explaining the technical means of the present application and do not indicate any limitations. Although the present application has been described in detail with reference to the above embodiments, those skilled in the art will understand that it is possible to modify the technical ideas described in the above embodiments or equivalently replace some of their technical features. These modifications or replacements do not prompt the essence of the corresponding claims to deviate from the spirit and scope of the claims of each embodiment of the present application.

Explanation of Reference Signs

[0041] 1 Wiring Terminal 2 Common Grounding Device 3 Current Limiting Energized Alarm Device 4 Composite Safety Protection Cap 5 Current Limiting Impedance 6 Audible and Visual Alarm Device 7 Insulating housing 8 Metal liner 9 Conductive cord 10 Grounding point

Claims

1. A safety protection tool for cable inspection and repair, comprising a common grounding device and a plurality of safety protection devices, wherein the common grounding device is provided with wiring terminals, and among them, the common grounding device is for connecting each of the safety protection devices through the wiring terminals, the safety protection device is for connecting each cable head, and the safety protection tool for cable inspection and repair is characterized in that.

2. The safety protection device is a composite safety protection cap, and the composite safety protection cap is composed of an inner layer metal conductive material and an outer layer insulating material, and the safety protection tool for cable inspection and repair according to Claim 1 is characterized in that.

3. Further comprising a current-limiting live warning device, and the current-limiting live warning device is connected in series via a conductive cord between the common grounding device and each of the safety protection devices, and the safety protection tool for cable inspection and repair according to Claim 1 is characterized in that.

4. The current-limiting live warning device consists of a current-limiting impedance and an audible / visual warning device, and the current-limiting impedance and the audible / visual warning device are electrically connected in series, and the safety protection tool for cable inspection and repair according to Claim 3 is characterized in that.

5. The metal liner of the composite safety protection cap is embedded with a corrugated elastic copper piece, and the safety protection tool for cable inspection and repair according to Claim 2 is characterized in that.

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