Photovoltaic cable system

Abstract

The utility model provides a photovoltaic cable system, and relates to the field of photovoltaic technology. Comprising a first cable and a second cable; two ends of the first cable are connected with the box type transformer and the string type inverter through the first cable terminal; the two ends of the second cable are connected with the two box-type transformers or the box-type transformers and the booster station switch cabinet through second cable terminals. The box-type transformer is connected with the communication box through a communication cable, a power line carrier cable and a power line of the programmable logic controller; the first cable, the second cable, the communication cable, the power line carrier cable and the programmable logic controller power line are laid in a direct burial mode. According to the utility model, the first cable, the second cable, the communication cable, the power line carrier cable and the programmable logic controller power line are laid in a direct burial manner, the first cable protection sleeve and the second cable protection sleeve are arranged, and the fireproof coating layers are arranged on the outer surfaces of the first cable and the second cable, so that the effects of convenient laying and water and fire prevention are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaics, in particular to a photovoltaic cable system. Background Art

[0002] In the process of photovoltaic power generation, the photovoltaic field includes a large number of devices with different functions. In order to ensure that the photovoltaic field can continuously and stably output electrical energy, it is necessary to lay a cable system between the devices.

[0003] In actual applications, it is difficult to waterproof and fireproof the cables between string inverters and box transformers, box inverters and box inverters, and box inverters and booster station switch cabinets, which leads to hidden dangers in power transmission and increases the difficulty of subsequent maintenance, making it difficult to ensure the normal operation of photovoltaic power generation equipment. Utility Model Content

[0004] The utility model provides a photovoltaic cable system, which solves the technical problem of being difficult to effectively prevent water and fire during the process of transmitting electric power from a string inverter to a switch cabinet of a booster station.

[0005] To solve the above technical problems, the technical solution of this novel invention is as follows:

[0006] A photovoltaic cable system, comprising:

[0007] a first cable and a second cable;

[0008] Two ends of the first cable are respectively connected to the box-type transformer and the string inverter;

[0009] The two ends of the second cable are respectively connected to two box-type transformers or the box-type transformer is connected to the switch cabinet of the booster station;

[0010] The box-type transformer is connected to the communication box via a communication cable, a power carrier cable and a programmable logic controller power line;

[0011] The first cable, the second cable, the communication cable, the power carrier cable and the programmable logic controller power line are all laid by direct burial.

[0012] Optionally, the underground parts of the first cable and the second cable are both buried in trench-filled sand;

[0013] A protective plate is provided on the top of the trench filling sand;

[0014] Backfill soil is arranged on the top of the protection plate.

[0015] Optionally, the heights of the first cable and the second cable from the ground are greater than a first preset distance;

[0016] The distances among the first cable, the second cable, the communication cable, the power carrier cable and the power line of the programmable logic controller are greater than a second preset distance.

[0017] Optionally, the string inverter is placed on a first foundation;

[0018] The box-type transformer and the step-up station switch cabinet are both placed on the second foundation;

[0019] A fire retardant coating layer is provided on the outer surfaces of the underground parts of the first cable and the second cable.

[0020] Optionally, a plurality of first cable protection tubes penetrating the first foundation are arranged inside the first foundation;

[0021] The first cable passes through the first cable protection tube and is connected to the string inverter;

[0022] The space between the first cable and the inner surface of the first cable protection tube is filled with asphalt hemp.

[0023] Optionally, caulking paste is provided at both ends of the first cable protection tube;

[0024] The outer side of the caulking paste is provided with a plugging material;

[0025] The lengths of the blocking material and the caulking paste are both greater than the third preset distance.

[0026] Optionally, a cable channel is provided in the second foundation;

[0027] A fireproof board is provided on the top of the cable channel;

[0028] The edge of the fireproof board is tightly connected to the cable channel through blocking material.

[0029] Optionally, a cable groove is provided on the fireproof board;

[0030] A second cable protection tube is sleeved on the outer surface of the first cable and the second cable located in the cable trough.

[0031] Optionally, the first cable passes through the cable trough and is connected to the box-type transformer, and the second cable passes through the cable trough and is connected to the box-type transformer or the booster station switch cabinet.

[0032] Optionally, the blocking material is provided at both ends of the second cable protection tube and between the outer surface of the second cable protection tube and the inner surface of the cable trough;

[0033] The second cable protection tube is tightly connected to the cable trough via a plugging material.

[0034] The above solution of the utility model includes at least the following beneficial effects:

[0035] The above scheme of the utility model includes: a first cable and a second cable; the two ends of the first cable are connected to the box-type transformer and the string inverter through the first cable terminal; the two ends of the second cable are connected to two box-type transformers or the box-type transformer and the booster station switch cabinet through the second cable terminal; the box-type transformer is connected to the communication box through the communication cable, the power carrier cable and the programmable logic controller power line; the first cable, the second cable, the communication cable, the power carrier cable and the programmable logic controller power line are all laid by direct burial. The technical scheme of the utility model can realize the power transmission between the string inverter and the box-type transformer by setting the first cable to connect the box-type transformer and the string transformer. By setting the second cable between the box-type transformers and between the box-type transformer and the booster station switch cabinet, multiple power transmission circuits are constructed, which plays the role of transmitting power between the box-type transformer and the booster station switch cabinet. By laying the first cable, the second cable, the communication cable, the power carrier cable and the programmable logic controller power line by direct burial, it is convenient to lay, save materials and laying time, and effectively prevent water and fire. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a schematic diagram of the first basic structure of the utility model;

[0037] Figure 2 It is a schematic diagram of the second basic structure of the utility model;

[0038] Figure 3 It is the second basic top view of the utility model;

[0039] Figure 4 This is a schematic diagram of the structure of the second cable protection tube of the utility model;

[0040] Figure 5 This is a schematic diagram of the connection structure between the communication box and the box-type inverter of the utility model;

[0041] Figure 6 This is a schematic diagram of the cable laying structure of the utility model;

[0042] Figure 7 This is a schematic diagram of the utility model cable and road crossing laying structure;

[0043] Figure 8 This is a schematic diagram of the utility model cable laying structure across a river;

[0044] Description of reference numerals:

[0045] 1. First cable; 2. Second cable; 3. Box transformer; 31. Communication box; 4. Communication cable; 5. Power carrier cable; 6. Programmable logic controller power line; 7. Trench filling sand; 8. Protection board; 9. Backfill soil; 10. Fire retardant coating layer; 11. First foundation; 12. First cable protection tube; 121. Asphalt hemp; 122. Caulking paste; 13. Blocking material; 14. Second foundation; 141. Cable channel; 142. Fireproof board; 143. Cable trough; 144. Second cable protection tube. DETAILED DESCRIPTION

[0046] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0047] like Figure 1 , Figure 2 and Figure 5 As shown, an embodiment of the utility model provides a photovoltaic cable system, comprising:

[0048] A first cable 1 and a second cable 2;

[0049] The two ends of the first cable 1 are connected to the box-type transformer 3 and the string inverter through the first cable terminal;

[0050] The two ends of the second cable 2 are connected to two box-type transformers 3 or the box-type transformer 3 is connected to the switch cabinet of the booster station through the second cable terminal;

[0051] The box-type transformer 3 is connected to the communication box 31 via a communication cable 4, a power carrier cable 5 and a programmable logic controller (PLC) power line 6;

[0052] The first cable 1, the second cable 2, the communication cable 4, the power carrier cable 5 and the programmable logic controller power line 6 are all laid by direct burial.

[0053] In this embodiment, both the box-type transformer 3 and the communication box 31 are provided with a fiber optic distribution box, and the fiber optic distribution box in the box-type transformer 3 is connected to the fiber optic distribution box in the communication box 31 through a communication cable 4. Specifically, the communication cable 4 adopts a cable of the ZC-DJYVP23-2×2×1.0 model. The power interface in the communication box 31 is connected to the "self-use 220Vac" interface in the box-type transformer 3 through the programmable logic controller power line 6. Specifically, the programmable logic controller power line 6 adopts a power line of the ZC-YJY23-0.6 / 1.0-3×6 model. The programmable logic controller interface of the communication box 31 is connected to the "800Vac" interface in the box-type transformer 3 through the power carrier cable 5. Specifically, the power carrier cable 5 adopts a communication cable 4 of the ZC-YJY23-1.8 / 3.0-3×10 model.

[0054] The technical solution of the utility model can realize the power transmission between the string inverter and the box-type transformer 3 by setting a first cable 1 to connect the box-type transformer 3 and the string transformer. By setting a second cable 2 between the box-type transformer 3 and between the box-type transformer 3 and the booster station switch cabinet, multiple power transmission circuits are constructed to transmit power between the box-type transformer 3 and the booster station switch cabinet. By laying the first cable 1, the second cable 2, the communication cable 4, the power carrier cable 5 and the programmable logic controller power line 6 by direct burial, it is convenient to lay, save materials and lay time.

[0055] In an optional embodiment of the utility model, the first cable 1 is a 3KV aluminum alloy core power cable;

[0056] The first cable terminal is a 3KV cable terminal.

[0057] In the above embodiment, the first cable 1 may be ZC-YJLHY23-1.8 / 3.0-3×150mm according to actual conditions. 2 ,ZC-YJLHY23-1.8 / 3.0-3×185mm 2 and ZC-YJLHY23-1.8 / 3.0-3×240mm 2 The first cable terminal can be matched with the first cable 1, and a transition plate containing copper and aluminum is arranged in the first cable terminal.

[0058] In an optional embodiment of the utility model, the second cable 2 is a 35KV copper core power cable;

[0059] The second cable terminal is a 35KV cable terminal.

[0060] In the above embodiment, the second cable 2 may be ZC-YJY23-26 / 35-3*70mm according to actual conditions. 2 、ZC-YJY23-26 / 35-3*120mm 2 、ZC-YJY23-26 / 35-3*150mm 2 、ZC-YJY23-26 / 35-3*240mm 2 or ZC-YJY23-26 / 35-3*300mm 2 One or more cables from the model.

[0061] The second cable terminal can be matched with the second cable 2, and a transition plate containing copper and aluminum is arranged in the second cable terminal.

[0062] In an optional embodiment of the utility model, the first cable 1 and the second cable 2 are both located underground and are buried in trench filling sand 7;

[0063] A protective plate 8 is provided on the top of the trench filling sand 7;

[0064] Backfill soil 9 is arranged on the top of the protection plate 8 .

[0065] like Figure 6 , Figure 7 and Figure 8 As shown, in the above embodiment, the first cable 1 and the second cable 2 are surrounded by groove-filling sand 7 with a thickness greater than 0.1m, the width of both ends of the protection plate 8 is greater than 0.1m of the width of the first cable 1 and the second cable 2, and the distance between the second cables 2 is greater than 0.2m.

[0066] When the first cable 1 and the second cable 2 cross the road, the distance between the first cable 1 and the second cable 2 and the ground is greater than 1m. The outer surface of the first cable 1 and the second cable 2 that cross the road is sheathed with a hot-dip galvanized steel pipe. Both ends of the hot-dip galvanized steel pipe are wider than the road surface by more than 1m. The wall thickness of the hot-dip galvanized steel pipe is greater than 3.5mm, and the thickness of the zinc layer is greater than 55um, which plays a role in waterproofing and protecting the cable structure. When the two first cables 1, the two second cables 2, and the first cable 1 and the second cable 2 cross, the distance between the first cable 1, the second cable 2, and the first cable 1 and the second cable 2 is greater than 0.25m, which plays a role in protecting the cable structure and avoiding interference between the cables. When the first cable 1 or the second cable 2 crosses the river, the distance between the first cable 1 or the second cable 2 and the bottom of the river is greater than 1m, which plays a role in preventing liquid leakage.

[0067] In an optional embodiment of the utility model, the heights of the first cable 1 and the second cable 2 from the ground are greater than a first preset distance;

[0068] The distances among the first cable 1 , the second cable 2 , the communication cable 4 , the power carrier cable 5 and the programmable logic controller power line 6 are greater than a second preset distance.

[0069] In the above embodiment, the center distance of the first cable 1 is greater than 2 times the outer diameter of the first cable 1, the bending radius of the first cable 1 is greater than 15 times the outer diameter of the first cable 1, and the bending radius of the second cable 2 is greater than 15 times the outer diameter of the second cable 2. Preferably, the first preset distance is 0.7m, and the second preset distance is 0.25m.

[0070] In an optional embodiment of the utility model, the string inverter is placed on a first foundation 11;

[0071] The box-type transformer 3 and the booster station switch cabinet are both placed on the second foundation 14;

[0072] like Figure 1 and Figure 2 As shown, a fire retardant coating layer 10 is provided on the outer surfaces of the first cable 1 and the second cable 2 located underground.

[0073] In the above embodiment, the fire retardant coating layer 10 is arranged on the outer surface of the first cable 1 and the second cable 2 located underground and close to the first foundation 11 and the second foundation 14. The thickness of the fire retardant coating layer 10 is greater than 2 mm and the length is greater than 1 m, which plays a role in preventing the fire from spreading along the cable after the cable is overloaded.

[0074] In an optional embodiment of the utility model, a plurality of first cable protection tubes 12 penetrating the first foundation 11 are arranged inside the first foundation;

[0075] The first cable 1 passes through the first cable protection tube 12 and is connected to the string inverter;

[0076] The space between the first cable 1 and the inner surface of the first cable protection tube 12 is filled with asphalt hemp 121 .

[0077] like Figure 1As shown, in the above embodiment, a plurality of cable reserved holes are opened inside the first foundation 11, and the cable reserved holes are perpendicular to the thickness direction of the first foundation 11 or at an acute angle within 30 degrees. The cable protection tube is arranged in the cable reserved holes, and the inner diameter of the cable reserved holes is the same as the outer diameter of the cable protection tube. Asphalt hemp 121 is filled between the outer surface of the first cable 1 and the inner surface of the cable protection tube to enhance the tensile strength of the first cable 1. Preferably, the diameter of the cable protection tube is 50 mm.

[0078] In an optional embodiment of the utility model, caulking paste 122 is provided at both ends of the first cable protection tube 12;

[0079] The outer side of the caulking paste 122 is provided with a plugging material 13;

[0080] The lengths of the blocking material 13 and the caulking paste 122 are greater than the third preset distance.

[0081] like Figure 1 As shown, in the above embodiment, the caulking paste 122 and the plugging material 13 are both arranged at the gap where the end of the cable protection tube is connected to the first cable 1, and the plugging material 13 and the caulking paste 122 seal the first cable 1 and the end of the cable protection tube to achieve waterproof and fireproof effects. Further, the third preset distance is 50 mm, and the plugging material 13 is an organic plugging material.

[0082] In an optional embodiment of the present utility model, a cable channel 141 is provided in the second foundation 14;

[0083] A fireproof plate 142 is provided on the top of the cable channel 141;

[0084] The edge of the fireproof board 142 is tightly connected to the cable channel 141 through the plugging material 13;

[0085] The fireproof board 142 is provided with a cable slot 143;

[0086] A second cable protection tube 144 is sleeved on the outer surface of the first cable 1 and the second cable 2 located in the cable trough 143;

[0087] The blocking materials 13 are disposed at both ends of the second cable protection tube 144 and between the outer surface of the second cable protection tube 144 and the inner surface of the cable groove 143 .

[0088] like Figure 2 and Figure 3As shown, in the above embodiment, the cable channel 141 runs through the second foundation 14 and a cable groove 143 is opened on the fireproof board 142, which is convenient for the first cable 1 to be connected to the box-type transformer 3 and the second cable 2 to be connected to the box-type transformer 3 or the switch cabinet of the booster station. A plugging material 13 is arranged between the edge of the fireproof board 142 and the inner side of the cable channel 141 to prevent liquid from flowing into the ground from outside the second foundation 14. The second cable protection tube 144 serves to protect the first cable 1 and the second cable 2. The plugging material 13 is arranged at both ends of the second cable protection tube 144 and between the outer surface of the second cable protection tube 144 and the inner surface of the cable groove 143 to play a role in waterproofing and fire prevention.

[0089] In an optional embodiment of the utility model, the first cable 1 passes through the cable trough 143 and is connected to the box-type transformer 3, and the second cable 2 passes through the cable trough 143 and is connected to the box-type transformer 3 or the booster station switch cabinet;

[0090] The second cable protection tube 144 is tightly connected to the cable trough 143 via a plugging material 13 .

[0091] like Figure 4 As shown, in the above embodiment, the distance between the second cable protection tube 144 and the inner surface of the cable trough 143 is less than 10 mm.

[0092] The above is a preferred embodiment of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A photovoltaic cable system, characterized in that: include: A first cable (1) and a second cable (2); The two ends of the first cable (1) are respectively connected to the box-type transformer (3) and the string inverter; The two ends of the second cable (2) are respectively connected to two box-type transformers (3) or the box-type transformer (3) is connected to a switch cabinet of a booster station; The box-type transformer (3) is connected to the communication box (31) via a communication cable (4), a power carrier cable (5) and a programmable logic controller power line (6); The first cable (1), the second cable (2), the communication cable (4), the power carrier cable (5) and the programmable logic controller power line (6) are all laid by direct burial.

2. The photovoltaic cable system according to claim 1, characterized in that: The underground parts of the first cable (1) and the second cable (2) are both buried in trench-filled sand (7); A protective plate (8) is provided on the top of the trench filling sand (7); Backfill soil (9) is arranged on the top of the protection plate (8).

3. The photovoltaic cable system according to claim 1, characterized in that: The heights of the first cable (1) and the second cable (2) from the ground are greater than a first preset distance; The distance between the first cable (1), the second cable (2), the communication cable (4), the power carrier cable (5) and the programmable logic controller power line (6) is greater than a second preset distance.

4. The photovoltaic cable system according to claim 1, characterized in that: The string inverter is placed on a first foundation (11); The box-type transformer (3) and the booster station switch cabinet are both placed on a second foundation (14); A fire retardant coating layer (10) is provided on the outer surfaces of the underground parts of the first cable (1) and the second cable (2).

5. The photovoltaic cable system according to claim 4, characterized in that: A plurality of first cable protection tubes (12) penetrating the first foundation (11) are arranged inside the first foundation (11); The first cable (1) passes through the first cable protection tube (12) and is connected to the string inverter; Asphalt hemp (121) is filled between the first cable (1) and the inner surface of the first cable protection tube (12).

6. The photovoltaic cable system according to claim 5, characterized in that: Both ends of the first cable protection tube (12) are provided with caulking paste (122); A plugging material (13) is arranged on the outer side of the caulking paste (122); The lengths of the blocking material (13) and the caulking paste (122) are both greater than the third preset distance.

7. The photovoltaic cable system according to claim 6, characterized in that: A cable channel (141) is provided in the second foundation (14); A fireproof board (142) is provided on the top of the cable channel (141); The edge of the fireproof board (142) is tightly connected to the cable channel (141) via the blocking material (13).

8. The photovoltaic cable system according to claim 7, characterized in that: The fireproof board (142) is provided with a cable groove (143); A second cable protection tube (144) is sleeved on a portion of the outer surface of the first cable (1) and the second cable (2) located in the cable trough (143).

9. The photovoltaic cable system according to claim 8, characterized in that: The first cable (1) passes through the cable trough (143) to be connected to the box-type transformer (3), and the second cable (2) passes through the cable trough (143) to be connected to the box-type transformer (3) or the switch cabinet of the booster station.

10. The photovoltaic cable system according to claim 9, characterized in that: The blocking material (13) is provided at both ends of the second cable protection tube (144) and between the outer surface of the second cable protection tube (144) and the inner surface of the cable trough (143); The second cable protection tube (144) is connected to the cable trough (143) via the blocking material (13).

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