Power cable insulation fault alarm device

Abstract

The utility model discloses a power cable insulation fault alarm device comprising an open type current transformer which is provided with a positioning mechanism used for clamping and positioning a cable. The open type current transformer is composed of a fixed section and a movable section rotationally arranged on the fixed section, and the positioning mechanism is composed of two positioning assemblies arranged in a mirror symmetry mode. According to the utility model, the positioning assemblies are arranged on the fixed section and the movable section of the open-type current transformer, so that the open-type current transformer can be normally sleeved on a cable to be detected, and after the open-type current transformer is installed, the two positioning assemblies can be synchronously installed and abut against the upper side and the lower side of the cable. According to the utility model, the cable can be ensured to be located in the middle of the open-type current transformer during detection, and the open-type current transformer can be limited to move on the cable by using friction force, so that the detection precision can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of power detection, in particular to a power cable insulation fault alarm device. Background Technique

[0002] The statements herein only provide the background technique related to the present invention and do not necessarily constitute the prior art.

[0003] The 380V AC system in the power plant is a grounding system, adopting the direct grounding method of the transformer neutral point. It is the only control and power source for 380V auxiliary loads, DC systems, UPS, etc. At present, for the insulation detection of the 380V AC system, except for some lighting power supplies equipped with leakage protectors, most other branch power supplies do not adopt leakage protection measures. Even if some branches of the 380V AC system are equipped with grounding protection devices, due to problems such as insufficient sensitivity and dead zones in the grounding protection, the fault current of high-resistance grounding cannot be detected in time. If the start of the grounding protection device causes suspicion, there are no relevant technical means to confirm the fault location. When the insulation of the AC system decreases and leakage or grounding faults occur, they cannot be discovered and processed in time, which may cause misoperation or refusal to operate of the relay protection, and even lead to fire and electrical equipment tripping accidents.

[0004] At present, through the combined research on equipment such as the 380V auxiliary AC system grounding model, insulation on-line monitoring device, acquisition module, current transformer, etc., and through the analysis of the residual current vector superposition algorithm, it is possible to realize the real-time on-line analysis of the insulation level of the 380V auxiliary AC system and accurately locate the fault branch. However, after the existing current transformer is installed on the cable, due to the different diameters of the cables, it is difficult to ensure that the cable is centered. At the same time, due to the gaps between them, the current transformer will also shift from its initial installation position during use, and both of the above situations will affect the detection accuracy. Summary of the Utility Model

[0005] The purpose of the utility model is to aim at the above deficiencies at present and provide a power cable insulation fault alarm device to achieve the purpose of improving the detection accuracy.

[0006] To solve the above technical problems, the utility model adopts the following technical scheme: a power cable insulation fault alarm device, including an opening type current transformer, and a positioning mechanism for clamping and positioning with the cable is arranged on the opening type current transformer; the opening type current transformer consists of a fixed section and a movable section rotatably arranged on the fixed section, and the positioning mechanism consists of two positioning components arranged symmetrically in a mirror image, and the two positioning components are respectively arranged on the fixed section and the movable section.

[0007] Further, the positioning component includes a semi-circular ring, and a pressing component capable of moving towards and away from the cable side is arranged on the semi-circular ring.

[0008] Further, the pressing component includes a flexible pressing plate, the flexible pressing plate is in a W shape, and the flexible pressing plate is composed of a middle pressing section and adjusting sections located on both sides of the pressing section. A guide groove for guiding the movement of the adjusting sections is arranged in the semi-circular ring. When both adjusting sections move towards the pressing section, the pressing section moves towards the cable side. When both adjusting sections move away from the pressing section, the pressing section moves away from the cable side;

[0009] The pressing component further includes a locking component for locking the moving position after the movement of the adjusting section is completed.

[0010] Further, the locking component includes a screw detachably arranged on the adjusting section. A dial is rotatably arranged on the screw. A compression spring is arranged on the bottom end of the dial close to the adjusting section side. A retaining pin is arranged on the top end of the dial close to the adjusting section side. A sliding groove for the dial to slide and a plurality of clamping grooves for the retaining pin to be clamped are formed on the semi-circular ring. When the compression spring is in a natural state, the retaining pin is clamped into the clamping groove. When the compression spring is completely compressed, the retaining pin disengages from the clamping groove.

[0011] Further, a scale groove for assisting in judging the moving distance of the adjusting section is arranged on the semi-circular ring.

[0012] The beneficial effects of the present utility model are embodied in:

[0013] In the present utility model, by arranging positioning components on the fixed section and the movable section of the split-core current transformer, the split-core current transformer can be normally sleeved on the cable to be detected. After the split-core current transformer is installed, the two positioning components can also be installed synchronously and abut against the upper and lower sides of the cable. This can not only ensure that the cable is in the middle position of the split-core current transformer during detection, but also utilize the frictional force to limit the movement of the split-core current transformer on the cable, thereby improving the detection accuracy. Description of the Drawings

[0014] Figure 1 is a three-dimensional view of the present utility model;

[0015] Figure 2 is a structural view of the positioning component of the present utility model;

[0016] Figure 3 is a cross-sectional view of the semi-circular ring of the present utility model;

[0017] Figure 4 is a structural view of the flexible pressing plate of the present utility model;

[0018] Figure 5 is a spliced view of the flexible pressing plate and the locking component of the present utility model;

[0019] Figure 6 This is a structural view of the locking component of the present utility model.

[0020] In the figure:

[0021] 1. Open-type current transformer; 2. Positioning mechanism; 21. Semi-circular ring; 22. Pressing component; 221. Flexible pressing plate; 222. Screw; 223. Pushing block; 224. Compression spring; 225. Pin. Specific embodiments

[0022] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0023] Please refer to Figure 1-6 , the present utility model discloses a power cable insulation fault alarm device, including an open-type current transformer 1, and a positioning mechanism 2 for clamping and positioning with the cable is arranged on the open-type current transformer 1; the open-type current transformer 1 is composed of a fixed section and a movable section rotatably arranged on the fixed section, and the positioning mechanism 2 is composed of two positioning components arranged symmetrically in mirror image, and the two positioning components are respectively arranged on the fixed section and the movable section.

[0024] In the present utility model, by arranging positioning components on the fixed section and the movable section of the open-type current transformer 1, the open-type current transformer 1 can be normally sleeved on the cable to be detected. After the open-type current transformer 1 is installed, the two positioning components can also be installed synchronously and abutted against the upper and lower sides of the cable, which can not only ensure that the cable is in the middle position of the open-type current transformer 1 during detection, but also use the friction force to limit the movement of the open-type current transformer 1 on the cable, thereby improving the detection accuracy.

[0025] In one embodiment, the positioning component includes a semi-circular ring 21, and a pressing component 22 capable of moving towards and away from the cable side is arranged on the semi-circular ring 21.

[0026] With such a design, the positioning component can be adjusted according to the cable diameter, so as to meet the installation requirements of various types of cables.

[0027] In one embodiment, the pressing component 22 includes a flexible pressing plate 221. The flexible pressing plate 221 is in a W shape and is composed of a middle pressing section and adjusting sections located on both sides of the pressing section. A guide groove for guiding the movement of the adjusting sections is provided inside the semi-circular ring 21. When both adjusting sections move towards the pressing section, the pressing section moves towards the cable. When both adjusting sections move away from the pressing section, the pressing section moves away from the cable.

[0028] The pressing component 22 further includes a locking component for locking the moving position after the movement of the adjusting sections is completed.

[0029] With such a design, the adjusting sections of the flexible pressing plate 221 are hidden inside the semi-circular ring 21, which can not only meet the adjustment requirements of the pressing section, but also reduce the overall occupied volume and facilitate installation and fixation in a narrow space.

[0030] Preferably, the flexible pressing plate 221 is a flexible rubber plate.

[0031] In one embodiment, the locking component includes a screw 222 detachably arranged on the adjusting section. A dial block 223 is rotatably arranged on the screw 222. A compression spring 224 is arranged on one side of the bottom end of the dial block 223 close to the adjusting section. A retaining pin 225 is arranged on one side of the top end of the dial block 223 close to the adjusting section. A sliding groove for the dial block 223 to slide and a plurality of clamping grooves for the retaining pin 225 to be clamped are formed on the semi-circular ring 21. When the compression spring 224 is in a natural state, the retaining pin 225 is clamped into the clamping groove. When the compression spring 224 is completely compressed, the retaining pin 225 disengages from the clamping groove.

[0032] With such a design, when it is necessary to move the adjusting section, by pressing the side of the dial block 223 close to the compression spring 224, the compression spring 224 is compressed, driving the dial block 223 to rotate slightly and the retaining pin 225 to disengage from the clamping groove. Then, the dial block 223 can be pushed to drive the adjusting section to move along the guide groove to change the position of the pressing section. After the adjustment of the pressing section is completed, the dial block 223 is released. The dial block 223 resets under the push of the compression spring 224, so that the retaining pin 225 is inserted into the adjacent clamping groove to complete the position limit. The whole adjustment process is fast and convenient, and the adjustment can be completed without additional tools.

[0033] In one embodiment, a scale groove for assisting in judging the moving distance of the adjusting section is provided on the semi-circular ring 21.

[0034] With such a design, it can be ensured that the two adjusting sections on the same flexible pressing plate 221 can maintain the same adjustment distance, ensuring that the pressing section can press the cable in the middle.

[0035] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present utility model, the directional indications are only used to explain the relative positional relationship, movement conditions, etc. between components in a specific posture (as shown in the attached drawings). If the specific posture changes, the directional indications will also change accordingly.

[0036] In addition, if there are descriptions such as "first", "second", etc. involved in the embodiments of the present utility model, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present utility model.

[0037] In addition, "a plurality of" means two or more.

[0038] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. An insulation fault alarm device for power cables, characterized in that: It includes an open current transformer (1), and a positioning mechanism (2) for clamping and positioning with a cable is arranged on the open current transformer (1); the open current transformer (1) is composed of a fixed section and a movable section rotatably arranged on the fixed section, and the positioning mechanism (2) is composed of two positioning components arranged symmetrically with a mirror image, and the two positioning components are respectively arranged on the fixed section and the movable section.

2. The power cable insulation fault alarm device according to claim 1, characterized in that: The positioning component includes a semi-circular ring (21), and a pressing component (22) capable of moving towards and away from the cable side is arranged on the semi-circular ring (21).

3. The power cable insulation fault alarm device according to claim 2, characterized in that: The pressing component (22) includes a flexible pressing plate (221), the flexible pressing plate (221) is in a W shape, and the flexible pressing plate (221) is composed of a middle pressing section and adjusting sections located on both sides of the pressing section. A guide groove for guiding the movement of the adjusting sections is arranged in the semi-circular ring (21). When both of the two adjusting sections move towards the pressing section side, the pressing section moves towards the cable side. When both of the two adjusting sections move away from the pressing section side, the pressing section moves away from the cable side; The pressing component (22) further includes a locking component for locking the moving position after the movement of the adjusting section is completed.

4. The power cable insulation fault alarm device according to claim 3, characterized in that: The locking component includes a screw (222) detachably arranged on the adjusting section. A dial block (223) is rotatably arranged on the screw (222). A compression spring (224) is arranged on the bottom end of the dial block (223) close to the adjusting section side. A retaining pin (225) is arranged on the top end of the dial block (223) close to the adjusting section side. A sliding groove for the dial block (223) to slide and a plurality of clamping grooves for the retaining pin (225) to be clamped are formed on the semi-circular ring (21). When the compression spring (224) is in a natural state, the retaining pin (225) is clamped into the clamping groove. When the compression spring (224) is completely compressed, the retaining pin (225) disengages from the clamping groove.

5. The power cable insulation fault alarm device according to claim 4, characterized in that: A scale groove for assisting in judging the moving distance of the adjusting section is arranged on the semi-circular ring (21).

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