Complete set of insulation grounding device for leading-down section of transformer substation

Abstract

The embodiment of the utility model discloses a complete set of insulation grounding device for a leading-down section of a transformer substation, which comprises an OPGW (Optical Fiber Composite Overhead Ground Wire) optical cable, a guide optical cable, a connector box and a residual cable rack for coiling the OPGW optical cable and the guide optical cable, and further comprises a composite insulator, a hoop assembly and a grounding wire, the residual cable rack is arranged on the hoop assembly through the composite insulator, the connector box is arranged on the residual cable rack, and the grounding wire is arranged on the connector box. The OPGW optical cable is connected with the upper end of the guide optical cable through the connector box, and the grounding wire is connected with the OPGW optical cable. The insulation distance is stable and consistent, the structure is firm, aging, fracture and loosening are avoided, and long-term safe and reliable use can be realized; when lightning stroke and line fault occur, the device can discharge electricity, so that the OPGW optical cable is in a complete grounding state, and large current is led to the ground through a tower.

Description

Technical Field

[0001] This utility model relates to the field of optical communication technology, and in particular to a complete set of insulation and grounding devices for the downlead section of a substation. Background Technology

[0002] The down conductor of the fiber optic composite overhead ground wire (OPGW) at the station was eroded and broken due to lightning and induced electricity, causing communication service interruption and seriously affecting the safety and normal operation of the communication system and the power grid.

[0003] Article 6.3 of DL / T 1378-2014, "Technical Guidelines for Lightning Protection and Grounding of Fiber Optic Composite Overhead Ground Wire (OPGW)," stipulates that the grounding of OPGW entering the site should adopt a reliable grounding method, and at least one point of the OPGW leading down from the structure should be grounded. In addition to the grounding point, a distance of not less than 20mm should be maintained between the OPGW body and the structure. The OPGW leading down should be fixed with insulated clamps, and the excess cable rack and junction box should also be insulated from the structure. However, there are no further specifications regarding the insulation process of the OPGW leading down cable.

[0004] The existing OPGW entry scheme has the following disadvantages: (1) The optical cable is easily scratched and burned by discharge at the frame platform. (2) Discharge burns occur between the surplus cable rack and the reserved cable, and the inter-cable erosion is obvious. (3) The aging of the insulation rubber causes the OPGW to loosen. (4) The insulation of the down-lead cable is unreliable, and its insulation distance is too close. Utility Model Content

[0005] The technical problem to be solved by this utility model embodiment is to provide a complete set of insulation and grounding device for the downlead section of a substation to prevent electrolytic corrosion, strand breakage and other situations.

[0006] To address the aforementioned technical problems, this utility model provides a complete insulation and grounding device for the downlead section of a substation, including an OPGW optical cable, a guide optical cable, a junction box, and a slack cable frame for coiling the OPGW optical cable and the guide optical cable. It also includes a composite insulator, a clamp assembly, and a grounding wire. The slack cable frame is mounted on the clamp assembly via the composite insulator, and the junction box is mounted on the slack cable frame. The upper ends of the OPGW optical cable and the guide optical cable are connected via the junction box, and the upper end of the grounding wire is connected to the OPGW optical cable and the guide optical cable.

[0007] Furthermore, the clamp assembly consists of an upper clamp, a lower clamp, and a frame angle steel set on the upper clamp and the lower clamp, with several composite insulators provided on the frame angle steel.

[0008] Furthermore, one end of the frame angle steel is connected to the lower clamp via a pivot, and the upper clamp is provided with several adjusting bolt holes. The other end of the frame angle steel is provided with adjusting holes corresponding to the adjusting bolt holes, and the other end of the frame angle steel is connected to the upper clamp via adjusting bolts.

[0009] Furthermore, it also includes a grounding switch installed on the cable rack, and the grounding wire is connected to the OPGW optical cable through the grounding switch.

[0010] Furthermore, the spare cable rack is equipped with several spare cable forks, and the OPGW optical cable and guide optical cable are coiled on the spare cable forks.

[0011] Furthermore, it also includes several downlead clamps for securing the OPGW optical cable.

[0012] The beneficial effects of this utility model are as follows: the insulation distance of this utility model is stable and consistent, and the structure is solid, it will not age, break or loosen, and can be used safely and reliably for a long time; in the event of lightning strikes or line faults, this utility model can discharge, so that the OPGW optical cable is in a completely grounded state, and the large current is introduced into the ground through the tower. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural diagram of the complete insulation and grounding device for the substation downlead section according to an embodiment of this utility model.

[0014] Figure 2 This is a three-dimensional structural diagram of the cable tray portion according to an embodiment of the present utility model.

[0015] Figure 3 This is a top view of the cable tray portion according to an embodiment of the present invention.

[0016] Explanation of icon numbers

[0017] OPGW optical cable 1, guide optical cable 2, junction box 3, excess cable rack 4, composite insulator 5, grounding wire 6, upper clamp 7, lower clamp 8, frame angle steel 9, grounding switch 10, excess cable fork 12, downlead clamp 13, frame 14, elbow clamp 15. Detailed Implementation

[0018] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of this application can be combined with each other. The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0019] In this embodiment of the invention, directional indicators (such as up, down, left, right, front, back, etc.) are only used to explain the relative positional relationship and movement of the components in a specific posture (as shown in the attached figure). If the specific posture changes, the directional indicators will also change accordingly.

[0020] Furthermore, in this utility model, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features.

[0021] Please refer to Figures 1-3 The complete set of insulation and grounding device for the substation lead-down section in this embodiment of the utility model includes OPGW optical cable, guide optical cable, junction box, surplus cable rack, composite insulator, clamp assembly, and grounding wire.

[0022] The excess cable rack is mounted on the clamp assembly via composite insulators. A junction box is located on the excess cable rack. The upper ends of the OPGW optical cable and the guide optical cable are connected through the junction box. The upper end of the grounding wire is connected to the OPGW optical cable and the guide optical cable. The grounding wire is typically crimped in the field.

[0023] In one implementation, the clamp assembly consists of an upper clamp, a lower clamp, and frame angle steel mounted on the upper and lower clamps. Several composite insulators are mounted on the frame angle steel. The composite insulators have sufficient safety distance, and the insulation distance is stable and consistent; moreover, the structure is robust, will not age, break, or loosen, and can be used safely and reliably for a long period.

[0024] In one implementation, the angle of the frame angle steel is adjustable. One end of the frame angle steel is connected to the lower clamp via a pivot, and the upper clamp is provided with several adjusting bolt holes. The other end of the frame angle steel is provided with adjusting holes corresponding to the adjusting bolt holes, and the other end of the frame angle steel is connected to the upper clamp via adjusting bolts.

[0025] The upper and lower clamps are installed on the frame (the frame is usually a cement column). The frame angle steel can be adjusted according to the frame angle to make the cable rack perpendicular to the ground.

[0026] The cable trays and frame angle steel are preferably made of galvanized steel, which ensures a stable and robust structure and a long service life. The upper and lower clamps are preferably made of hot-dip galvanized flat steel.

[0027] In one implementation, the complete insulation and grounding device for the substation's downlead section also includes a grounding switch mounted on the slack cable rack via composite insulators. The upper end of the grounding wire is connected to the OPGW optical cable via the grounding switch. The lower end of the grounding wire is connected to the grounding device or reliably electrically connected to the substation's internal grid.

[0028] During normal operation, the grounding switch is closed, ensuring reliable grounding of the optical cable. When it is necessary to measure the grounding resistance within the station, the grounding switch is opened, making the operation of measuring the grounding resistance within the station very convenient.

[0029] In one implementation, the slack cable rack is provided with several slack cable forks, and the OPGW optical cable and guide optical cable are coiled on the slack cable forks.

[0030] As one implementation method, the complete insulation and grounding device for the substation's downlead section also includes several downlead clamps for fixing the OPGW optical cable. The downlead clamps are installed on the frame using elbow clamps. By fixing the downlead clamps, the distance between the optical cable and the edges of flanges or crossbeam platforms is ensured to be no less than 100mm, completely solving the problem of cable burnt strands in this area. The downlead clamps preferably use 10kV post-type composite insulators.

[0031] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A complete insulation and grounding device for the downlead section of a substation, comprising an OPGW optical cable, a guide optical cable, a junction box, and a slack cable rack for coiling the OPGW optical cable and the guide optical cable, characterized in that, It also includes composite insulators, clamp assemblies, and grounding wires. The excess cable rack is set on the clamp assembly via composite insulators, and the junction box is set on the excess cable rack. The upper ends of the OPGW optical cable and the guide optical cable are connected through the junction box, and the grounding wire is connected to the OPGW optical cable.

2. The complete set of insulation and grounding device for the substation downlead section as described in claim 1, characterized in that, The clamp assembly consists of an upper clamp, a lower clamp, and frame angle steel mounted on the upper and lower clamps. Several composite insulators are mounted on the frame angle steel.

3. The complete set of insulation and grounding device for the substation downlead section as described in claim 2, characterized in that, One end of the frame angle steel is connected to the lower clamp via a pivot, and the upper clamp is provided with several adjusting bolt holes. The other end of the frame angle steel is provided with adjusting holes corresponding to the adjusting bolt holes, and the other end of the frame angle steel is connected to the upper clamp via adjusting bolts.

4. The complete set of insulation and grounding device for the substation downlead section as described in claim 1, characterized in that, It also includes a grounding switch installed on the cable rack, and the grounding wire is connected to the OPGW optical cable through the grounding switch.

5. The complete set of insulation and grounding device for the substation downlead section as described in claim 1, characterized in that, The spare cable rack is equipped with several spare cable forks, and the OPGW optical cable and guide optical cable are coiled on the spare cable forks.

6. The complete set of insulation and grounding device for the substation downlead section as described in claim 1, characterized in that, It also includes several downlead clamps for securing the OPGW optical cable.

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