CN218070763U - Secondary grounding system suitable for hydropower station - Google Patents
Secondary grounding system suitable for hydropower station Download PDFInfo
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- CN218070763U CN218070763U CN202222409288.0U CN202222409288U CN218070763U CN 218070763 U CN218070763 U CN 218070763U CN 202222409288 U CN202222409288 U CN 202222409288U CN 218070763 U CN218070763 U CN 218070763U
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Abstract
The utility model provides a secondary ground system suitable for power station, mainly including setting up the secondary ground in relay protection room female arranging and set up respectively at communication room, the other screen room of machine, high tension switchgear room, regimen room, GIS room and the indoor secondary of low tension switchgear and connect the branch row, the female row of secondary ground is connected with main grounding net and every secondary through single core cable respectively. Adopt the utility model discloses can satisfy the universality demand of different power station secondary ground connection equipotentials.
Description
Technical Field
The utility model belongs to the technical field of the ground connection technique and specifically relates to a secondary ground system suitable for power station is related to.
Background
Various electrical devices and systems of the hydropower station need a certain potential as a reference point and are used for safety protection of personnel and equipment, so that a main grounding network of the hydropower station is generally built on the basis of a factory building and a basic natural grounding body of the hydropower station. According to the requirements of national regulations, major anti-accident measures of national power grids and anti-accident measures of southern power grids, secondary equipment of the hydropower station needs to independently build a corresponding secondary equipotential grounding grid, and the secondary equipotential grounding grid is effectively connected with a main grounding grid of the hydropower station. The secondary equipotential grounding network of the hydropower station is used as an important component of the hydropower station, and has great significance for the electromagnetic interference resistance, the lightning stroke prevention, the correct action of relay protection equipment and the safety protection of personal equipment of a secondary loop of the total station.
Because the requirements of each unit on the secondary equipotential grounding network of the hydropower station are different, the current secondary equipotential grounding system for the hydropower station has the conditions of non-uniformity and irregularity, and the universality requirements of the secondary equipotential grounding of different hydropower stations cannot be met.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a secondary grounding system suitable for power station to alleviate the above-mentioned problem among the prior art.
The utility model provides a secondary grounding system suitable for a hydropower station, wherein a plant of the hydropower station is provided with a relay protection chamber, a communication chamber, a water regime chamber, a machine side screen chamber, a GIS chamber, a high-voltage switch cabinet chamber and a low-voltage switch cabinet chamber; the relay protection chamber, the communication chamber, the water regime chamber, the beside screen chamber, the GIS chamber, the high-voltage switch cabinet chamber and the low-voltage switch cabinet chamber are all provided with one or more rows of screen cabinets in rows; the secondary grounding system includes: the secondary grounding busbar comprises a secondary grounding busbar, a main grounding grid, a first secondary grounding ground busbar, a second secondary grounding ground busbar, a third secondary grounding ground busbar, a fourth secondary grounding ground busbar, a fifth secondary grounding ground busbar and a sixth secondary grounding ground busbar; the secondary grounding busbar is respectively connected with the main grounding grid, the first secondary ground connection busbar, the second secondary ground connection busbar, the third secondary ground connection busbar, the fourth secondary ground connection busbar, the fifth secondary ground connection busbar and the sixth secondary ground connection busbar through single-core cables; the secondary grounding busbar is arranged at the bottom of each row of screen cabinets in the relay protection chamber; the first secondary ground connection row is arranged at the bottom of each row of screen cabinets in the communication room; the second secondary ground connection support is arranged at the bottom of each row of screen cabinets in the beside machine screen room; the third secondary ground support is arranged at the bottom of each row of screen cabinets in the high-voltage switch cabinet chamber; the fourth secondary ground connection row is arranged at the bottom of each row of screen cabinets in the regimen room; the fifth secondary ground support is arranged at the bottom of each row of screen cabinets in the GIS room; and the sixth secondary ground support is arranged at the bottom of each row of screen cabinets in the low-voltage switch cabinet chamber.
As a possible implementation, the secondary ground busbar includes a first copper bar segment and a second copper bar segment; the first copper bar sections are arranged at the bottoms of each row of screen cabinets in the relay protection chamber in a through manner along the arrangement direction of each row of screen cabinets in the relay protection chamber, and the first copper bar sections are connected end to end through the second copper bar sections.
As a possible implementation, an antistatic floor is arranged in the relay protection chamber; the bottom of each screen cabinet in the relay protection room is fixedly arranged on the anti-static floor through first channel steel; a secondary equipotential copper bar is arranged inside each screen cabinet in the relay protection room; a post insulator is fixedly mounted on one side of a first channel steel at the bottom of each screen cabinet in the relay protection chamber through a connecting piece, and each post insulator is fixedly connected with the secondary grounding busbar through a connecting piece; and the secondary equipotential copper bar of each screen cabinet in the relay protection chamber is fixedly connected with the corresponding post insulator through a single-core cable.
As a possible implementation, the communication room and the regimen room are both provided with antistatic floors; the bottom of each screen cabinet in the communication room and the regimen room is fixedly arranged on the anti-static floor through second channel steel; a secondary equipotential copper bar is arranged inside each screen cabinet in the communication room and the regimen room; a post insulator is fixedly arranged on one side of a second channel steel at the bottom of each screen cabinet in the communication chamber and the regimen chamber through a connecting piece, and each post insulator is fixedly connected with a secondary ground socket row in the communication chamber and the regimen chamber through the connecting piece; and the secondary equipotential copper bars of each screen cabinet in the communication room and the regimen room are fixedly connected with the corresponding post insulators through single-core cables.
As a possible implementation, cable trenches are arranged in the beside-machine screen chamber, the GIS chamber, the high-voltage switch cabinet chamber and the low-voltage switch cabinet chamber; the bottom of each screen cabinet in the beside-machine screen chamber, the GIS chamber, the high-voltage switch cabinet chamber and the low-voltage switch cabinet chamber is fixedly arranged above the cable trench through a third channel steel; a secondary equipotential copper bar is arranged inside each screen cabinet in the beside-machine screen chamber, the GIS chamber, the high-voltage switch cabinet chamber and the low-voltage switch cabinet chamber; a post insulator is fixedly mounted on one side of a cable trench at the bottom of each screen cabinet in the beside-machine screen chamber, the GIS chamber, the high-voltage switch cabinet chamber and the low-voltage switch cabinet chamber, and each post insulator is fixedly connected with a secondary ground row in the chamber through a connecting piece; and the secondary equipotential copper bar of each screen cabinet in the machine side screen chamber, the GIS chamber, the high-voltage switch cabinet chamber and the low-voltage switch cabinet chamber is fixedly connected with the corresponding post insulator through a single-core cable.
As a possible realization, the secondary grounding busbar, the first secondary ground branch row, the second secondary ground branch row, the third secondary ground branch row, the fourth secondary ground branch row, the fifth secondary ground branch row and the sixth secondary ground branch row adopt a grounding copper bar of-40 mm multiplied by 4 mm.
As a possible implementation, the secondary grounding busbar is provided with a plurality of first through holes at equal intervals along the length direction of the secondary grounding busbar; the first secondary ground connection row, the second secondary ground connection row, the third secondary ground connection row, the fourth secondary ground connection row, the fifth secondary ground connection row and the sixth secondary ground connection row are provided with second through holes at equal intervals along the length direction of each row; the distance between the adjacent first through holes is different from the distance between the adjacent second through holes.
As a possible implementation, the distance between adjacent first through holes is 400mm; and the distance between every two adjacent second through holes is 100mm.
As a possible realization, the connection piece uses an M8 × 30 expansion bolt.
As a possible implementation, the secondary grounding busbar is connected with the main grounding grid through 4 single-core cables.
The utility model provides a secondary ground system suitable for power station, main secondary ground that includes to set up in relay protection room is female arranges and sets up respectively at the indoor secondary of communication room, the other screen room of machine, high tension switchgear room, regimen room, GIS room and low tension switchgear and connects the branch row, and the female row of secondary ground is connected with main earth mat and every secondary ground connection branch row through single core cable respectively. This secondary grounding system structure is succinct clear effective, can satisfy the universality demand of different hydropower station secondary ground equipotentials to alleviate the problem that the secondary equipotential grounding system structure of different hydropower stations that exists is unified, not normal among the prior art.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic diagram of a secondary grounding system suitable for a hydropower station in an embodiment of the present invention;
fig. 2 is an exemplary diagram of a secondary grounding system suitable for use in a hydropower station in an embodiment of the present invention;
fig. 3 is an exemplary diagram of a secondary ground busbar according to an embodiment of the present invention;
fig. 4 is an exemplary diagram of the connection between the secondary equipotential copper bar and the secondary grounding busbar in the relay protection chamber in the embodiment of the present invention;
FIG. 5 is an illustration of an embodiment of the present invention in which the secondary ground support is arranged;
fig. 6 is an exemplary diagram of the connection between the secondary equipotential copper bar and the secondary ground row in the beside screen room, the GIS room, the high-voltage switch cabinet room and the low-voltage switch cabinet room in the embodiment of the present invention;
fig. 7 is an illustration showing an installation example of a secondary grounding busbar in a relay protection chamber in an embodiment of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Various electrical devices and systems of the hydropower station need a certain potential as a reference point and are used for safety protection of personnel and equipment, so that a main grounding network of the hydropower station is generally built on the basis of a factory building and a basic natural grounding body of the hydropower station. According to the requirements of national regulations, major anti-accident measures of national power grids and anti-accident measures of southern power grids, secondary equipment of the hydropower station needs to independently build a corresponding secondary equipotential grounding grid, and the secondary equipotential grounding grid is effectively connected with a main grounding grid of the power station. The secondary equipotential grounding network of the hydropower station is used as an important component of the hydropower station, and has great significance for the electromagnetic interference resistance, the lightning stroke prevention, the correct action of relay protection equipment and the safety protection of personal equipment of a secondary loop of the total station.
Because the requirements of each unit on the secondary equipotential grounding network of the hydropower station are different, the current secondary equipotential grounding system for the hydropower station has the condition of non-uniformity and non-standardization, and the universality requirements of the secondary equipotential of different hydropower stations cannot be met.
Based on the above-mentioned problem among the prior art, the utility model provides a secondary ground system suitable for power station can satisfy the universality demand of different power station secondary ground equipotentials.
A plant of a hydropower station is generally provided with a relay protection chamber, a communication chamber, a water regime chamber, a beside-machine screen chamber, a GIS chamber, a high-voltage switch cabinet chamber (such as a 10kV switch cabinet chamber), a low-voltage switch cabinet chamber (such as a 0.4kV switch cabinet chamber) and the like; the relay protection room, the communication room, the water regime room, the machine side screen room, the GIS room, the high-voltage switch cabinet room and the low-voltage switch cabinet room are all internally provided with cable trenches, and one or more rows of screen cabinets are arranged in rows in the relay protection room, the communication room, the water regime room, the machine side screen room, the GIS room, the high-voltage switch cabinet room and the low-voltage switch cabinet room. An embodiment of the utility model provides a secondary grounding system suitable for power station, it is shown with reference to fig. 1 that this secondary grounding system can include: the grounding device comprises a secondary grounding busbar 1, a main grounding grid 8, a first secondary ground connection row 2, a second secondary ground connection row 3, a third secondary ground connection row 4, a fourth secondary ground connection row 5, a fifth secondary ground connection row 6 and a sixth secondary ground connection row 7; the secondary grounding busbar 1 is respectively connected with a main grounding grid 8, a first secondary grounding ground socket 2, a second secondary grounding ground socket 3, a third secondary grounding ground socket 4, a fourth secondary grounding ground socket 5, a fifth secondary grounding ground socket 6 and a sixth secondary grounding ground socket 7 through single-core cables;
the secondary grounding busbar 1 is arranged at the bottom of each row of screen cabinets in the relay protection chamber; the first secondary ground connection row 2 is arranged at the bottom of each row of screen cabinets in the communication room; the second secondary ground connection row 3 is arranged at the bottom of each row of screen cabinets in the beside screen room; the third secondary ground connection row 4 is arranged at the bottom of each row of screen cabinets in the high-voltage switch cabinet chamber; the fourth secondary ground connection row 5 is arranged at the bottom of each row of screen cabinets in the regimen room; the fifth secondary ground support row 6 is arranged at the bottom of each row of screen cabinets in the GIS room; and a sixth secondary ground connection row 7 is arranged at the bottom of each row of screen cabinets in the low-voltage switch cabinet chamber.
The utility model provides a secondary ground system suitable for power station, mainly including setting up the secondary ground in the relay protection room female arranging and set up respectively at communication room, the other screen room of machine, high tension switchgear room, regimen room, GIS room and the indoor secondary of low tension switchgear and connect the branch row, the female row of secondary ground is connected with main grounding net and every secondary branch row through single core cable respectively. The secondary grounding system is simple, clear and effective in structure, and can meet the universality requirement of secondary grounding equipotentials of different hydropower stations, so that the problem that the secondary equipotential grounding systems of different hydropower stations in the prior art are not uniform and irregular in structure is solved.
Exemplarily, referring to fig. 2, a secondary ground busbar 1 is a closed-loop structure formed by connecting end to end of copper bars, a plurality of first through holes 11 are distributed on the secondary ground busbar 1, and post insulators 12 are fixedly mounted at positions where a specified number of first through holes 11 are located; a certain position of the main grounding grid 8 is connected with an insulator 12 arranged on the secondary grounding busbar 1 through a single-core cable 13, so that the single-point reliable connection between the secondary grounding busbar 1 and the main grounding grid 8 is realized; similarly, certain positions of the first secondary ground branch row 2, the second secondary ground branch row 3, the third secondary ground branch row 4, the fourth secondary ground branch row 5, the fifth secondary ground branch row 6 and the sixth secondary ground branch row 7 are respectively correspondingly connected with the insulators 12 arranged on the secondary grounding busbar 1 through single-core cables 14.
Wherein, the inside of each screen cabinet in relay protection room, communication room, the other screen room of machine, high tension switchgear room, regimen room, GIS room and the low tension switchgear room all is provided with secondary equipotential copper bar. Referring to fig. 2, a first secondary ground connection row 2 is respectively connected with a secondary equipotential copper bar 21 of each screen cabinet in a communication room through a single-core cable 14, a second secondary ground connection row 3 is respectively connected with a secondary equipotential copper bar 31 of each screen cabinet in a beside-machine screen room through a single-core cable 14, a third secondary ground connection row 4 is respectively connected with a secondary equipotential copper bar 41 of each screen cabinet in a high-voltage switch cabinet room through a single-core cable 14, a fourth secondary ground connection row 5 is respectively connected with a secondary equipotential copper bar 51 of each screen cabinet in a water-conditioned room through a single-core cable 14, a fifth secondary ground connection row 6 is respectively connected with a secondary equipotential copper bar 61 of each screen cabinet in a GIS room through a single-core cable 14, and a sixth secondary ground connection row 7 is respectively connected with a secondary equipotential copper bar 71 of each screen cabinet in a low-voltage switch cabinet room through a single-core cable 14.
Illustratively, referring to fig. 3, the secondary ground busbar 1 is provided with a plurality of first through holes 11 at equal intervals along the length direction thereof, and each first through hole 11 can be used for connecting a single core cable 13, a single core cable 14, a post insulator 12, and the like. The size of the opening of the first through holes 11 and the distance between the adjacent first through holes 11 can be determined according to actual requirements, for example, the size of the opening of the first through holes 11 is 10mm, and the distance between the adjacent first through holes 11 is 400mm, which is not limited. In addition, every first through-hole 11 all can use with the cooperation of parts such as bolt, gasket, for example, every first through-hole 11 all can be used with a set of M8x 30's hexagon bolt 15 (including two tin-plated gaskets) supporting use, every set of bolt all can be used for realizing through first through-hole 11 that the secondary is earthed and is arranged 1, single core cable and post insulator 12 three between be connected, or realize that the secondary is earthed and arrange 1 and the single core cable between the two be connected, or realize that the secondary is earthed and arrange 1 and post insulator 12 between the two be connected.
Exemplarily, referring to fig. 4, in the relay protection room, the bottom of each screen cabinet 9 is fixedly mounted on the antistatic floor 94 through a first channel steel 93, a secondary equipotential copper bar is disposed inside each screen cabinet 9, a post insulator 12 is fixedly mounted on one side of the first channel steel 93 at the bottom of each screen cabinet 9 through a connecting piece 95, each post insulator 12 is fixedly connected with the secondary grounding busbar 1 through the connecting piece 95, and the secondary equipotential copper bar of each screen cabinet 9 is fixedly connected with the corresponding post insulator 12 through a single-core cable 92.
Exemplarily, based on the similar structure of fig. 4, in the communication room and the water-conditioned room, the bottom of each screen cabinet 9 is fixedly mounted on the antistatic floor 94 through a second channel steel (having the same structure as the first channel steel 93), a secondary equipotential copper bar is provided inside each screen cabinet 9, a post insulator 12 is fixedly mounted on one side of the second channel steel at the bottom of each screen cabinet 9 through a connecting piece 95, each post insulator 12 is fixedly connected with a secondary earth-supported row in the room where the post insulator is located through the connecting piece 95, and the secondary equipotential copper bar of each screen cabinet 9 is fixedly connected with the corresponding post insulator 12 through a single-core cable 92.
Illustratively, referring to fig. 5, each of the first secondary ground contact row 2, the second secondary ground contact row 3, the third secondary ground contact row 4, the fourth secondary ground contact row 5, the fifth secondary ground contact row 6 and the sixth secondary ground contact row 7 (which may be referred to as ground contact row 10 in fig. 5) is provided with second through holes 101 at equal intervals along the length direction of each ground contact row. The size of the opening of the second through hole 101 and the distance between adjacent second through holes 101 can be determined according to actual requirements, for example, the size of the opening of the second through hole 101 is 10mm, and the distance between adjacent second through holes 101 is 100mm, which is not limited herein. In addition, each second through hole 101 can be used together with a bolt, a gasket, and the like, for example, each second through hole 101 can be used together with a set of M8 × 30 hexagon bolts 103 (including two tin-plated gaskets), and each set of bolts can be used for realizing the connection among the three of the secondary ground socket 10, the single-core cable and the post insulator 12, or the connection between the two of the secondary ground socket 10 and the single-core cable, or the connection between the two of the secondary ground socket 10 and the post insulator 12 through the second through hole 101. The pitch between adjacent first through holes 11 may be the same as the pitch between adjacent second through holes 101, or may be different from the pitch between adjacent second through holes 101, which is not limited. For example, the pitch between adjacent first through holes 11 is 400mm, and the pitch between adjacent second through holes 101 is 100mm.
Exemplarily, as shown in fig. 6, the machine side screen room, the GIS room, the high-voltage switch cabinet room and the low-voltage switch cabinet room are provided, the cable trench includes a part of the floor plate 014 and a through hole 0141 formed on the floor plate 014, the bottom of each screen cabinet 01 is fixedly installed above the cable trench through a third channel steel 013, a secondary equipotential copper bar is provided inside each screen cabinet 01, a post insulator 12 is fixedly installed on one side of the cable trench at the bottom of each screen cabinet 01, each post insulator 12 is fixedly connected with a secondary earth support row 10 in the room where the post insulator is located through a connecting piece 015, and the secondary equipotential copper bar of each screen cabinet 01 is fixedly connected with the corresponding post insulator 12 through a single core cable 012.
For example, referring to fig. 4 and 6, since the secondary ground busbar 1 can be generally divided into a straight line portion (i.e., a straight ground busbar) and a turning portion (i.e., a turning ground busbar), and the secondary ground busbar generally adopts a straight ground busbar, the spacing between adjacent post insulators 12 on each turning ground busbar and the spacing between adjacent post insulators 12 on each straight ground busbar can be set according to the actual size of a single cabinet. In order to facilitate the installation and fixation of the secondary grounding busbar 1 and each secondary ground busbar, it is usually necessary to make the distance between the adjacent post insulators 12 on the linear grounding busbar and the width of a single indoor cabinet consistent as much as possible, make the distance between the adjacent post insulators 12 on the linear ground busbar and the width of a single indoor cabinet consistent as much as possible, and set the distance between the adjacent post insulators 12 on the turning grounding busbar according to the width of the single indoor cabinet. For example, the width of each indoor single cabinet is 0.8m, the distance between adjacent post insulators 12 on the linear grounding busbar can be set to 0.8m, the distance between adjacent post insulators 12 on the turning grounding busbar can be set to 0.5m, and the distance between adjacent post insulators 12 on the linear grounding busbar can be set to 0.8m.
Exemplarily, referring to fig. 7, in the relay protection chamber, the secondary ground busbar 1 includes a first copper bar segment (i.e., a vertical copper bar segment in fig. 7) and a second copper bar segment (i.e., a horizontal copper bar segment in fig. 7), the first copper bar segment is disposed at the bottom of each row of the screen cabinets 101 along the arrangement direction of each row of the screen cabinets 101, and two adjacent first copper bar segments are connected end to end through the second copper bar segment. In addition, still can additionally install corresponding insulator 12 on secondary ground busbar 1, will additionally install corresponding insulator 12 and be connected with the indoor secondary copper bar of central control through single core cable 02 to realize the female connection between arranging 1 of secondary ground and the indoor secondary copper bar of central control.
Illustratively, referring to fig. 2, the secondary ground busbar 1, the first secondary ground busbar 2, the second secondary ground busbar 3, the third secondary ground busbar 4, the fourth secondary ground busbar 5, the fifth secondary ground busbar 6 and the sixth secondary ground busbar 7 may adopt a-40 mm × 4mm ground copper bar.
For example, referring to fig. 4 and 6, the M8 × 30 expansion bolts may be used for the connecting members 95 and 015.
For example, referring to fig. 2, the secondary ground busbar 1 may be connected to the main ground grid 8 through 4 single core cables 13.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications or substitutions do not depart from the scope of the invention in its corresponding aspects.
Claims (10)
1. A secondary grounding system suitable for a hydropower station is characterized in that a workshop of the hydropower station is provided with a relay protection chamber, a communication chamber, a water regime chamber, a beside screen chamber, a GIS chamber, a high-voltage switch cabinet chamber and a low-voltage switch cabinet chamber; the relay protection chamber, the communication chamber, the water regime chamber, the beside screen chamber, the GIS chamber, the high-voltage switch cabinet chamber and the low-voltage switch cabinet chamber are all provided with one or more rows of screen cabinets in rows; the secondary grounding system includes: the secondary grounding busbar comprises a secondary grounding busbar, a main grounding grid, a first secondary grounding ground busbar, a second secondary grounding ground busbar, a third secondary grounding ground busbar, a fourth secondary grounding ground busbar, a fifth secondary grounding ground busbar and a sixth secondary grounding ground busbar; the secondary grounding busbar is respectively connected with the main grounding grid, the first secondary ground connecting row, the second secondary ground connecting row, the third secondary ground connecting row, the fourth secondary ground connecting row, the fifth secondary ground connecting row and the sixth secondary ground connecting row through single-core cables;
the secondary grounding busbar is arranged at the bottom of each row of screen cabinets in the relay protection chamber; the first secondary ground connection row is arranged at the bottom of each row of screen cabinets in the communication room; the second secondary ground support is arranged at the bottom of each row of screen cabinets in the beside screen room; the third secondary ground connection row is arranged at the bottom of each row of screen cabinets in the high-voltage switch cabinet chamber; the fourth secondary ground connection row is arranged at the bottom of each row of screen cabinets in the water regime room; the fifth secondary ground support is arranged at the bottom of each row of screen cabinets in the GIS room; and the sixth secondary ground support is arranged at the bottom of each row of screen cabinets in the low-voltage switch cabinet chamber.
2. The secondary grounding system according to claim 1, wherein the secondary grounding busbar includes a first copper bar segment and a second copper bar segment; the first copper bar sections are arranged at the bottom of each row of screen cabinets in the relay protection chamber in a full-length mode along the arrangement direction of each row of screen cabinets in the relay protection chamber, and the first copper bar sections are connected end to end through the second copper bar sections.
3. The secondary grounding system of claim 1, wherein an antistatic floor is provided in the relay chamber; the bottom of each screen cabinet in the relay protection room is fixedly arranged on the anti-static floor through a first channel steel; a secondary equipotential copper bar is arranged inside each screen cabinet in the relay protection room; a post insulator is fixedly mounted on one side of a first channel steel at the bottom of each screen cabinet in the relay protection chamber through a connecting piece, and each post insulator is fixedly connected with the secondary grounding busbar through a connecting piece; and the secondary equipotential copper bar of each screen cabinet in the relay protection chamber is fixedly connected with the corresponding post insulator through a single-core cable.
4. The secondary grounding system of claim 1, wherein an antistatic floor is provided in each of the communication chamber and the regimen chamber; the bottom of each screen cabinet in the communication room and the regimen room is fixedly arranged on the anti-static floor through second channel steel; a secondary equipotential copper bar is arranged inside each screen cabinet in the communication room and the regimen room; a post insulator is fixedly arranged on one side of a second channel steel at the bottom of each screen cabinet in the communication chamber and the regimen chamber through a connecting piece, and each post insulator is fixedly connected with a secondary ground socket row in the communication chamber and the regimen chamber through the connecting piece; and the secondary equipotential copper bars of each screen cabinet in the communication room and the regimen room are fixedly connected with the corresponding post insulators through single-core cables.
5. The secondary grounding system of claim 1, wherein cable trenches are arranged in the beside-machine screen chamber, the GIS chamber, the high-voltage switch cabinet chamber and the low-voltage switch cabinet chamber; the bottom of each screen cabinet in the machine side screen chamber, the GIS chamber, the high-voltage switch cabinet chamber and the low-voltage switch cabinet chamber is fixedly arranged above the cable trench through a third channel steel; a secondary equipotential copper bar is arranged inside each screen cabinet in the beside-machine screen chamber, the GIS chamber, the high-voltage switch cabinet chamber and the low-voltage switch cabinet chamber; a post insulator is fixedly installed on one side of a cable trench at the bottom of each screen cabinet in the machine side screen chamber, the GIS chamber, the high-voltage switch cabinet chamber and the low-voltage switch cabinet chamber, and each post insulator is fixedly connected with a secondary ground row in the room where the post insulator is located through a connecting piece; and the secondary equipotential copper bar of each screen cabinet in the machine side screen chamber, the GIS chamber, the high-voltage switch cabinet chamber and the low-voltage switch cabinet chamber is fixedly connected with the corresponding post insulator through a single-core cable.
6. The secondary grounding system of claim 1, wherein the secondary grounding busbar, the first secondary ground pin row, the second secondary ground pin row, the third secondary ground pin row, the fourth secondary ground pin row, the fifth secondary ground pin row and the sixth secondary ground pin row are all made of-40 mm x 4mm grounding copper bars.
7. The secondary grounding system of claim 1, wherein the secondary grounding busbar is provided with a plurality of first through holes at equal intervals along the length direction thereof; the first secondary ground connection row, the second secondary ground connection row, the third secondary ground connection row, the fourth secondary ground connection row, the fifth secondary ground connection row and the sixth secondary ground connection row are provided with second through holes at equal intervals along the length direction of each row; the distance between the adjacent first through holes is different from the distance between the adjacent second through holes.
8. The secondary grounding system of claim 7, wherein a pitch of adjacent first through holes is 400mm; and the distance between every two adjacent second through holes is 100mm.
9. The secondary grounding system of any of claims 3-5, wherein the connector is an M8x30 expansion bolt.
10. The secondary grounding system according to any one of claims 1 to 8, wherein the secondary grounding busbar is connected to the main grounding grid through 4 single-core cables.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222409288.0U CN218070763U (en) | 2022-09-09 | 2022-09-09 | Secondary grounding system suitable for hydropower station |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222409288.0U CN218070763U (en) | 2022-09-09 | 2022-09-09 | Secondary grounding system suitable for hydropower station |
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| Publication Number | Publication Date |
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| CN218070763U true CN218070763U (en) | 2022-12-16 |
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| CN202222409288.0U Active CN218070763U (en) | 2022-09-09 | 2022-09-09 | Secondary grounding system suitable for hydropower station |
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| Country | Link |
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