A device for adjusting phase sequence of cable outlet

Abstract

The utility model discloses a device for adjusting cable outgoing line phase sequence, through fixing device with the cable of needing adjusting phase sequence fixed, then through the adjusting handle connection fixing device, subsequently adjust the direction of twisting phase sequence according to need, and the adjustment amount is accurate when the phase sequence of the cable after permanent fixation is just consistent with the phase sequence of low voltage load switch, then carry out corresponding subsequent work, can arrange the whole row cable consistent under the condition that the box transformer incoming line is more, and the core line camber is consistent, avoids the core line crossing phenomenon, ensures the phase distance of core line and wiring part, thereby guarantees long -term safe and stable operation, avoids the cable and produces the concentrated stress between the fixed position and the conductor connecting section, causes the cable terminal and the load switch incoming terminal to contact not closely, causes the phenomenon of burning because of the bad contact finally, strengthens the cable and the low voltage load switch contact reliability, and good economic and practical effect has been obtained for long -term safe and stable operation.

Description

Technical Field

[0001] This utility model relates to the field of low-voltage AC cable construction technology for photovoltaic power plants, and in particular to a device for adjusting the phase sequence of cable outputs. Background Technology

[0002] Since the low-voltage cables in photovoltaic projects are basically used to step up the voltage from the inverter to the transformer substation before being transmitted to the step-up substation or substation, the low-voltage cables are generally 3*240mm². 2 Or 3*300mm 2 Aluminum alloy cables with steel armor are characterized by high hardness and difficulty in bending. However, due to the shape of the cable head, the cable must be inserted from the bottom of the transformer substation before the cable head can be made. The load switches of the transformer substation are designed to be arranged in rows, and the phase sequence of each load switch is fixed. Therefore, the core wires of the low-voltage cables connected to it must correspond to it. However, the phase sequence of each low-voltage cable extending into the transformer substation may be different when the cable head is made. If the phase wires are not adjusted, they will cross each other. Therefore, the cable phase sequence adjustment device needs to twist the low-voltage cable to make it consistent with the phase sequence of the incoming line section of the transformer substation load switch. Due to the cold weather, the high strength of the cable itself, and the short free section of the cable, it is impossible to twist the low-voltage cable by hand. Using tools such as pipe wrenches and belt wrenches can easily damage the cable sheath due to the small contact surface with the low-voltage cable. In severe cases, it may damage the cable insulation layer. Therefore, a special device is required.

[0003] In addition, with the increasing number of photovoltaic projects and the varying standards, the wiring methods on the low-voltage side of the transformer substation are diverse. Phenomena such as the phase sequence of the same cable crossing each other and the spacing between adjacent cables being too small are common. Even worse, some places add insulating rubber to the insulation gaps to ensure a safe distance. As low-voltage cables generate heat during long-term operation, this will accelerate the aging of insulation at the contact points of adjacent cables. In addition, the reduced insulation distance can easily lead to phase-to-phase short circuits, thus posing a significant safety hazard. This is especially true when the cables are in operation for a long time, where the safety risks are even more prominent.

[0004] Therefore, it is necessary to develop a device for adjusting the phase sequence of cable outputs to solve the above problems. Utility Model Content

[0005] The purpose of this invention is to design a device for adjusting the phase sequence of cable outputs in order to solve the above-mentioned problems.

[0006] This utility model achieves the above objectives through the following technical solutions: A device for adjusting the phase sequence of cable outputs, comprising: The fixing device includes a first clamp and a second clamp for clamping the cable. Both the first clamp and the second clamp are formed into a semi-circular annular columnar structure. The inner diameter of both the first clamp and the second clamp is slightly larger than or equal to the outer diameter of the cable. Protective device; the protective device is installed between the first clamp and the second clamp and the connection point of the cable, respectively; Adjustment handle; the adjustment handle is connected to the fixing device.

[0007] The beneficial effects of this utility model are as follows: This invention uses a fixing device to secure the cable whose phase sequence needs adjustment. Then, the fixing device is connected via an adjusting handle, and the phase sequence is adjusted by twisting the handle as needed. The adjustment is made until the phase sequence of the cable is permanently fixed and matches the phase sequence of the low-voltage load switch. Subsequent work is then performed. In cases with many incoming lines to a transformer substation, this invention ensures that the entire row of cables is arranged consistently with uniform core wire curvature, avoiding core wire crossing and ensuring sufficient phase-to-phase distance between core wires and connection points, thus guaranteeing long-term safe and stable operation. It also prevents concentrated stress between the cable and conductor connection at the fixed position, avoiding poor contact between the cable terminals and the load switch terminals, which could lead to burnout due to poor contact. Furthermore, it enhances the reliability of the cable-to-low-voltage load switch contact, achieving good economic and practical results for long-term safe and stable operation. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of the structure of the device of this utility model; Figure 2 This is a schematic diagram of the fixing device in this utility model.

[0009] In the diagram: 1-Fixing device; 2-Adjusting handle; 3-Connecting column; 4-Screw; 5-Nut; 6-Lower mounting plate; 7-Upper mounting plate; 8-First clamp; 9-Second clamp; 10-Hinge; 11-Connecting rod. Detailed Implementation

[0010] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0011] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0012] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0013] In the description of this utility model, it should be understood that the terms "upper", "lower", "inner", "outer", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the utility model product is usually placed in during use, or the orientation or positional relationship that is commonly understood by those skilled in the art. They are only used to facilitate the description of this utility model and to simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0014] Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0015] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, terms such as "set" and "connection" should be interpreted broadly. For example, "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; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0016] The specific embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0017] like Figure 1-2 As shown, a device for adjusting the phase sequence of cable outputs includes: Fixing device 1; The fixing device 1 includes a first clamp 8 and a second clamp 9 for clamping the cable. Both the first clamp 8 and the second clamp 9 are formed into a semi-circular annular columnar structure. The inner diameter of the first clamp 8 and the second clamp 9 is slightly larger than or equal to the outer diameter of the cable. Protective devices; the protective devices are installed between the first clamp 8 and the second clamp 9 and the connection points of the cable, respectively; Adjusting handle 2; Adjusting handle 2 is connected to fixing device 1.

[0018] In some embodiments, such as Figure 2As shown, the fixing device 1 also includes a screw 4, a nut 5, a lower mounting plate 6, an upper mounting plate 7, and a hinge 10. The outer wall of the middle part of the first clamp 8 is connected to the middle part of the upper mounting plate 7, and the outer wall of the middle part of the second clamp 9 is connected to the middle part of the lower mounting plate 6. The first end of the upper mounting plate 7 is connected to the first end of the hinge 10, and the first end of the lower mounting plate 6 is connected to the second end of the hinge 10. The second end of the upper mounting plate 7 has a through hole. The first end of the screw 4 is connected to the second end of the lower mounting plate 6. The second end of the screw 4 passes through the through hole on the upper mounting plate 7 and is threadedly engaged with the nut 5.

[0019] In some embodiments, such as Figure 2 As shown, the fixing device 1 also includes four connecting rods 11. Two connecting rods 11 are located on both sides of the connection between the upper mounting plate 7 and the first clamp 8, and are connected to the upper mounting plate 7 and the first clamp 8 respectively. The other two connecting rods 11 are located on both sides of the connection between the lower mounting plate 6 and the second clamp 9, and are connected to the lower mounting plate 6 and the second clamp 9 respectively. The connections between the upper mounting plate 7 and the first clamp 8, between the connecting rods 11 and the upper mounting plate 7, between the first clamp 8 and the connecting rods 11, between the lower mounting plate 6 and the second clamp 9, between the connecting rods 11 and the lower mounting plate 6, and between the second clamp 9 and the connecting rods 11 are all welded.

[0020] In some embodiments, such as Figure 1 and 2 As shown, the fixing device 1 also includes a connecting post 3. The first end of the connecting post 3 is connected to the lower end of the second end of the lower mounting plate 6, and the adjusting handle 2 is connected to the second end of the connecting post 3. The adjusting handle 2 is formed into a cylindrical structure, and the inner diameter of the adjusting handle 2 is larger than the outer diameter of the connecting post 3. The adjusting handle 2 is sleeved on the connecting post 3.

[0021] In some embodiments, such as Figure 2 As shown, the upper mounting plate 7 is perpendicular to the upper end of the hinge 10, and the lower mounting plate 6 is perpendicular to the lower end of the hinge 10.

[0022] In some embodiments, the outer diameter of the cable is 50mm or 57mm. Therefore, the first clamp 8 and the second clamp 9 are both made of 100mm long φ65*4mm galvanized steel pipes divided into two semicircles to form clamps that hold the cable. The backs of the first clamp 8 and the second clamp 9 are welded to the lower mounting plate 6 and the upper mounting plate 7 of 100*150*10mm respectively. To ensure welding quality, 2*φ12 circular connecting rods 11 are filled on both sides between the back of the clamp and the steel plate. A high-strength screw 4 of M12*100mm strength grade 8.8 is welded at the middle of the lower mounting plate 6 at a distance of 30mm from the edge to clamp the cable with the nut 5. The upper mounting plate 7 has a 30*15mm rectangular hole cut in the middle near the edge to cooperate with the screw 4. The net distance between the lower mounting plate 6 and the upper mounting plate 7 is 57mm.

[0023] Protective devices: In high-altitude and cold regions, especially during winter construction, the outer sheath of the cable is relatively fragile and easily damaged by external forces. In particular, the clamps are in direct contact with the cable, and even a slight force can cause the cable to break. Therefore, protective measures are required. Considering the convenience of using local materials, the stripped cable sheath can be used as a protective material. Before adjusting the phase sequence, it can be directly added between the clamps and the cable to avoid direct contact between the clamps and the cable. At the same time, it increases the area of ​​the cable subjected to torsional force and reduces the possibility of cable damage.

[0024] Considering that all cables are adjusted while fully inserted into the transformer substation, and taking into account the need for ease and lightness in installing the fixing device 1, a plug-in connection method is adopted for the extension of the connecting column 3 and the adjusting handle 2. The connecting column 3 is made of 150mm φ24 round steel, with 50mm welded to the middle section of the lower mounting plate 6. The adjusting handle 2 is made of 700mm φ32*3mm seamless steel pipe. When in use, the adjusting handle 2 is inserted into the connecting column 3, and the phase sequence of the cable outlet is adjusted by rotating the adjusting handle 2 to extend the lever arm. In practice, first, thread the low-voltage cables into the low-voltage incoming side of the transformer substation in sequence, temporarily fix and mark each cable, then begin stripping the outer sheath and steel armor of the cables. After removing the filler, expose the cable cores. Once all cables have exposed and marked cores, count the cables whose phase sequence needs adjustment. Fix the cables that do not require phase sequence adjustment first. For cables that require phase sequence adjustment, loosen the temporary fixation first, loosening it to the extent that the cable can rotate freely. Then, add protective rubber to the vertical section where the cable enters the transformer substation, and then fix device 1 on the rubber cover. Fixing device 1 should avoid the adjusting handle 2. Adjust the cable's orientation, then tighten the bolts of the fixing device 1. At this point, the first clamp 8 and the second clamp 9 in the fixing device 1 are tightly fixed to the cable to be adjusted. Then, put on the adjusting handle 2 and adjust the phase sequence in the required direction. Considering that the cable has a reverse force during the adjustment process, over-adjustment is necessary. Over-adjustment is closely related to the ambient temperature. The adjustment amount should be such that the phase sequence of the cable is exactly consistent with the phase sequence of the low-voltage load switch after permanent fixing. Then, carry out the corresponding subsequent work. The wiring after adjusting the cable in this way is aesthetically pleasing and has reliable contact, enhancing the long-term stable operation of the cable wiring. After adjustment, the entire row of cables is arranged in a consistent manner, the core wire curvature is consistent, and there is no core wire crossing phenomenon, ensuring the phase distance between the core wires and the wiring part, thereby ensuring long-term safe and stable operation. It avoids the generation of concentrated stress between the cable and the conductor connection section at the fixed position, which can lead to poor contact between the cable terminal and the copper busbar of the load switch, easily generating transition resistance that may gradually increase, eventually leading to burnout due to poor contact at the contact surface.

[0025] The above are merely preferred embodiments of this utility model. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model.

Claims

1. A device for adjusting the phase sequence of cable outputs, characterized in that, include: Fixture; The fixing device includes a first clamp and a second clamp for clamping the cable. Both the first clamp and the second clamp are formed into a semi-circular annular columnar structure. The inner diameter of both the first clamp and the second clamp is slightly larger than or equal to the outer diameter of the cable. Protective device; the protective device is installed between the first clamp and the second clamp and the connection point of the cable, respectively; Adjustment handle; the adjustment handle is connected to the fixing device.

2. The device for adjusting the phase sequence of cable outputs according to claim 1, characterized in that, The fixing device also includes a screw, a nut, a lower mounting plate, an upper mounting plate, and a hinge. The outer wall of the middle part of the first clamp is connected to the middle part of the upper mounting plate, the outer wall of the middle part of the second clamp is connected to the middle part of the lower mounting plate, the first end of the upper mounting plate is connected to the first end of the hinge, the first end of the lower mounting plate is connected to the second end of the hinge, the second end of the upper mounting plate has a through hole, the first end of the screw is connected to the second end of the lower mounting plate, and the second end of the screw passes through the through hole on the upper mounting plate and is threaded into the nut.

3. The device for adjusting the phase sequence of cable outputs according to claim 2, characterized in that, The fixing device also includes four connecting rods, two of which are located on both sides of the connection between the upper mounting plate and the first clamp, and are connected to the upper mounting plate and the first clamp respectively; the other two connecting rods are located on both sides of the connection between the lower mounting plate and the second clamp, and are connected to the lower mounting plate and the second clamp respectively.

4. The device for adjusting the phase sequence of cable outputs according to claim 3, characterized in that, The connections between the upper mounting plate and the first clamp, the connecting rod and the upper mounting plate, the first clamp and the connecting rod, the lower mounting plate and the second clamp, the connecting rod and the lower mounting plate, and the second clamp and the connecting rod are all welded.

5. The device for adjusting the phase sequence of cable outputs according to claim 2, characterized in that, The fixing device also includes a connecting column, the first end of which is connected to the lower end of the second end of the lower mounting plate, and the adjusting handle is connected to the second end of the connecting column.

6. The device for adjusting the phase sequence of cable outputs according to claim 5, characterized in that, The adjusting handle is formed into a cylindrical structure, with the inner diameter of the adjusting handle being larger than the outer diameter of the connecting post, and the adjusting handle is sleeved on the connecting post.

7. The device for adjusting the phase sequence of cable outputs according to claim 2, characterized in that, The upper mounting plate is perpendicular to the upper end of the hinge, and the lower mounting plate is perpendicular to the lower end of the hinge.

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