CN113541114B - Underground barrier-based ground current protection method for buried pipe network - Google Patents
Underground barrier-based ground current protection method for buried pipe network Download PDFInfo
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- CN113541114B CN113541114B CN202110735649.8A CN202110735649A CN113541114B CN 113541114 B CN113541114 B CN 113541114B CN 202110735649 A CN202110735649 A CN 202110735649A CN 113541114 B CN113541114 B CN 113541114B
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- barrier
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- insulating plate
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/045—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage adapted to a particular application and not provided for elsewhere
- H02H9/047—Free-wheeling circuits
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
- H01R4/58—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation characterised by the form or material of the contacting members
- H01R4/66—Connections with the terrestrial mass, e.g. earth plate, earth pin
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G9/00—Installations of electric cables or lines in or on the ground or water
- H02G9/06—Installations of electric cables or lines in or on the ground or water in underground tubes or conduits; Tubes or conduits therefor
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- Laying Of Electric Cables Or Lines Outside (AREA)
Abstract
The invention discloses a ground current protection method for a buried pipe network based on an underground barrier. The method provides three arrangement schemes that the barrier is only arranged on the grounding side of the tower, or only arranged on the buried pipeline side, or simultaneously arranged on the grounding side of the tower and the buried pipeline side. When the power grid has a ground fault or is struck by lightning, the discharge channel in the soil can be prevented from being developed and reaching the pipeline due to the existence of the barrier, the current flowing to the pipeline side is reduced, and the influence of the power grid on the pipeline is reduced.
Description
Technical Field
The invention belongs to the technical field of power transmission and transformation, and particularly relates to a buried pipe network grounding current protection method based on an underground barrier.
Background
Lightning strikes to overhead transmission lines may cause insulator flashover. In general, flashover is an ionization path along the surface of an insulator, which is connected to a tower and a grounded foundation and finally flows through soil, releasing lightning current to shallow soil near the tower and the grounded foundation. When lightning current is released in the soil, if the impact current is large, the possibility of breaking through the soil and forming electric arcs in the soil exists. The arc path end point may be a nearby ground water level, but is more likely to be a water pipe, sewer pipe, municipal natural gas pipe, oil pipeline, buried communication cable and optical and/or power cable, etc. disposed in the soil. And power frequency follow current is generated after flashover current caused by lightning stroke, if the soil is discharged and punctured under the action of lightning impulse and an arc channel is formed, the power frequency follow current flows through the lightning channel in an arc form and finally stops on the surface of a buried metal pipeline. When the distance between the metal pipeline and the tower grounding device is short, under the condition that the power transmission line has a grounding fault, the fault current can also directly flow to the metal pipeline through the grounding device, and the threat to the metal pipeline is caused.
On the other hand, the ground potential near the pipeline is raised by the ground current, and the pipeline metal is connected with the low potential far away, so that the anti-corrosion layer of the pipeline bears higher voltage and can be punctured.
Disclosure of Invention
The invention provides a method for protecting a buried pipe network from an earth current, which is used for protecting the buried pipe network when a power transmission line is struck by lightning or has an earth fault.
In order to achieve the purpose, the ground current protection method for the buried pipe network based on the underground barrier is characterized in that the barrier is arranged between a buried pipeline and a tower grounding device and comprises an insulating plate, and a conductor is arranged on the insulating plate.
Further, the conductor in the barrier is installed on one side of the insulating plate, and the diameter of the conductor is smaller than the width of the insulating plate, and the length of the conductor is smaller than the length of the insulating plate.
Furthermore, the position of the lower edge of the barrier is lower than that of the tower grounding device and the lower edge of the buried pipeline.
Further, the conductors are arranged at the same depth of the axis of the buried pipeline.
Further, when installing the barrier, the side of the barrier having the conductor is faced to the buried pipeline.
Further, the length of the barrier is greater than the diagonal length of the grounding device, and the height is greater than the maximum depth of the buried pipeline in the ground.
Further, the insulating plate is made of an epoxy resin material.
Further, the conductor is a graphite conductor.
Compared with the prior art, the invention has at least the following beneficial technical effects:
the invention vertically arranges the flat-plate type barrier in the soil between the buried pipeline and the tower grounding device, and when the power grid has a grounding fault or is struck by lightning, the existence of the barrier can prevent a discharge channel in the soil from developing to the buried pipeline, reduce the current flowing to the side of the buried pipeline, balance the ground potential rise near the pipeline and the tower, reduce the influence of the power grid on the pipeline and realize the protection of the buried pipe network.
Furthermore, the conductor in the barrier is arranged on one side of the insulating plate, the diameter of the conductor is smaller than the width of the insulating plate, and the length of the conductor is smaller than the length of the insulating plate, so that the direct discharge of the tower grounding device to the conductor in the barrier is avoided.
Furthermore, the conductor is arranged at the same depth position of the axis of the buried pipeline, so that the protective effect of the barrier is improved.
Furthermore, the length of the barrier is greater than the diagonal length of the grounding device, and the height of the barrier is greater than the maximum depth of the buried pipeline in the ground, so that the protection effect of the barrier is improved.
Furthermore, the insulating plate is made of epoxy resin, the insulating property and the heat resistance of the epoxy resin are excellent, the protection effect can be guaranteed, and the service life is long.
Furthermore, the conductor is a graphite conductor, so that the conductor is prevented from being corroded.
Drawings
Fig. 1 is a schematic view of a barrier arrangement according to the present invention;
FIG. 2 is a schematic diagram of a specific structure of the barrier;
FIG. 3 shows the structure before and after installation of the barrier in example 1;
in the figure: 1. a tower grounding device; 2. a barrier; 3. burying a pipeline; 21. insulating board, 22, conductor.
Detailed Description
In order to make the objects and technical solutions of the present invention clearer and easier to understand. The present invention will be described in further detail with reference to the following drawings and examples, wherein the specific examples are provided for illustrative purposes only and are not intended to limit the present invention.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings, which are based on the orientations and positional relationships indicated in the drawings, and are used for convenience in describing the present invention and for simplicity in description, but do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified. In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1
The technical scheme includes that a ground current protection method for a buried pipe network based on an underground barrier is characterized in that the underground current protection method is characterized in that a barrier 2 is arranged in a position 1m away from a buried pipeline 3 in an area between the buried pipeline 3 and a tower grounding device 1, and in order to reduce construction difficulty, the barrier 2 is in a flat plate type and is vertically arranged.
The structure of the barrier 2 referring to fig. 2, the barrier 2 is composed of an insulating plate 21 and a conductor 22. A conductor 22 is attached to the center of the insulating plate 21, and the conductor 22 has a rod shape. The insulating plate 21 can prevent the tower grounding device 1 from discharging to the buried pipeline 3 and block the generation of a discharge channel, and meanwhile, the insulating plate 21 changes the current dispersion path of the current in the ground and reduces the current flowing to the direction of the buried pipeline 3; the conductor 22 in the barrier 2 can then balance the ground potential rise near the buried pipeline 3 or the tower earthing device 1.
Preferably, in order to avoid that the tower earthing device 1 discharges directly to the conductor 22 in the barrier 2, the insulating plate 21 is burned out under the thermal effect of the current. The conductor 22 in the barrier is installed only on one side of the insulating plate 21, and the conductor 22 has a diameter smaller than the width of the insulating plate 21 and a length smaller than the length of the insulating plate 21. When installing the barrier 2, the side with the conductor 22 faces the buried pipeline 3 and the side without the conductor 22 faces the tower earthing device 1.
After the barrier 2 is installed, when the arc channel reaches the vicinity of the barrier 2, the thermal effect is strong, and the insulating plate 21 needs to have both excellent insulating property and heat resistance, so the insulating plate 21 is made of epoxy resin material.
The metallic conductor material has a problem of corrosion in soil, and the conductor 22 is preferably a graphite conductor.
In order to guarantee the effect of the barrier, the length of the barrier 2 should be greater than the diagonal length of the grounding device 1, the height should be greater than the maximum depth of the buried pipeline 3 in the ground, the conductor 22 is arranged at the same depth of the axis of the buried pipeline 3, and the length of the conductor 22 is half of the length of the insulating plate 21.
Example 2
A buried pipe network ground current inlet protection method based on underground barriers is characterized in that a barrier 2 is vertically arranged between a buried pipeline 3 and a tower grounding device 1 at a position 2m away from the grounding device, and the barrier 2 is composed of an insulating plate 21 and a conductor 22. A conductor 22 is mounted at the center of the insulating plate 21. The insulating plate 21 can prevent the tower grounding device 1 from discharging to the buried pipeline 3 and block the generation of a discharging channel, and meanwhile, the insulating plate 21 changes the current dispersion path of the current in the ground and reduces the current flowing to the direction of the buried pipeline 3; the conductor 22 in the barrier 2 can then balance the ground potential rise near the buried pipeline 3 or the tower earthing device 1.
The conductor 22 in the barrier 2 is only mounted on the side of the insulating plate 21 adjacent the buried pipeline 3 and the conductor 22 has a diameter less than the width of the insulating plate 21 and a length less than the length of the insulating plate 21. In order to avoid the tower grounding device 1 directly discharging the conductor 22 in the barrier 2 and burning the insulating board 21 under the heat effect of the current.
Example 3
In this implementation, two barriers 2 are arranged between buried pipeline 3 and earthing device 1, the distance between one barrier 2 and buried pipeline 3 is 2m, the distance between the other barrier 2 and earthing device 1 is 1m, and two barriers 2 adopt flat plate type and vertical arrangement to reduce the construction difficulty.
The barrier 2 includes an insulating plate 21 and a conductor 22. The conductor 22 is installed at the center of the insulating plate 21, and the conductor 22 has a rod shape. The insulating plate 21 is used for preventing the tower grounding device 1 from discharging to the buried pipeline 3, blocking the generation of a discharging channel, changing a current dispersion path in the ground and reducing the current flowing to the direction of the buried pipeline 3; the conductor 22 can balance the ground potential rise near the buried pipeline 3 or the tower grounding device 1.
Preferably, in order to avoid that the tower earthing device 1 discharges directly to the conductor 22 in the barrier 2, the insulating plate 21 is burned out under the thermal effect of the current. The conductor 22 in the barrier is mounted on only one side of the insulating plate 21 and the conductor 22 has a diameter smaller than the width of the insulating plate 21 and a length smaller than the length of the insulating plate 21. When installing the barrier 2, the side with the conductor 22 faces the buried pipeline 3 and the side without the conductor 22 faces the tower earthing device 1.
After the barrier 2 is installed, when the arc channel reaches the vicinity of the barrier 2, the thermal effect is strong, and the insulating plate 21 needs to have both excellent insulating property and heat resistance, so the insulating plate 21 is made of epoxy resin material.
The conductor 22 is a graphite conductor to avoid corrosion of the metallic conductor material in the soil.
In order to guarantee the effect of the barrier, the length of the barrier 2 is larger than the diagonal length of the grounding device 1, the height is larger than the maximum depth of the buried pipeline 3 in the ground, the conductor 22 is arranged at the same depth of the axis of the buried pipeline 3, and the length of the conductor 22 is half of the length of the insulating plate 21.
It should be noted that: the number and the positions of the barriers 2 are flexibly selected according to the actual situation of site construction, wherein the barriers are preferably arranged on the pipeline side and the tower side at the same time; secondly, the arrangement is selected to be only arranged at the side of the pipeline; finally, the arrangement is chosen only on the side of the tower.
Example 4
Taking a tower grounding device with grounding resistance of 10 omega as an example, the tower grounding device is of a square-frame and ray type, the side length of a square frame is 15m, the length of a ray is 20m, the length of a diagonal line of the grounding device is about 61m, and the buried depth of the grounding device is 0.8m.
A30 km buried metal pipeline is arranged near the grounding device, the nearest distance between the buried metal pipeline and the grounding device is 6m, the outer diameter of the pipeline is 1016mm, the wall thickness is 22mm, the anticorrosive layer is 3PE material with the thickness of 3mm, the buried depth of the axis of the pipeline is 1.5m, and the maximum depth of the pipeline in the ground is about 2m.
Meanwhile, 1m of the buried pipeline side and the grounding device side are respectively provided with a barrier 2, the length of the barrier 2 is 61m, the width of the barrier 2 is 2m, and the conductor 22 in the barrier is made of graphite with the diameter of 30 mm.
When a 2.6/50 mus lightning current of 50kA is passed through the earthing device, the maximum voltage of the coating of the buried metal pipeline before and after installation of the barrier 2 is shown in figure 3. The voltage peak for the coating before installation of the barrier was 85.5kA and for the coating after installation of the barrier was 74.1kA, from which it can be seen that the barrier reduces the maximum voltage of the coating by 13.3%.
The foregoing is a more detailed description of the invention and is not intended to limit the invention to the particular form disclosed. For those skilled in the art to which the invention relates, several simple deductions or substitutions may be made without departing from the spirit of the invention, which should be construed as belonging to the scope of the invention.
Claims (3)
1. A buried pipe network ground inlet current protection method based on an underground barrier is characterized in that the barrier (2) is arranged between a buried pipeline (3) and a tower grounding device (1), the barrier (2) comprises an insulating plate (21), and a conductor (22) is installed on the insulating plate (21);
the conductor (22) is arranged on one side of the insulating plate (21), the diameter of the conductor (22) is smaller than the width of the insulating plate (21), and the length of the conductor is smaller than the length of the insulating plate (21);
the lower edge of the barrier (2) is lower than the lower edges of the tower grounding device (1) and the buried pipeline (3);
the conductors (22) are arranged at the same depth of the axis of the buried pipeline (3);
when the barrier (2) is installed, the side of the barrier (2) with the conductor (22) faces the buried pipeline (3);
the length of the barrier (2) is larger than the diagonal length of the tower grounding device (1), and the height of the barrier is larger than the maximum depth of the buried pipeline (3) in the ground.
2. A method for protecting the current entering the ground of a buried pipe network based on an underground barrier according to claim 1, characterized in that the insulation board (21) is made of epoxy resin material.
3. The method for protecting the current entering the ground of the buried pipe network based on the underground barrier as claimed in claim 1, wherein the conductor (22) is a graphite conductor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110735649.8A CN113541114B (en) | 2021-06-30 | 2021-06-30 | Underground barrier-based ground current protection method for buried pipe network |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110735649.8A CN113541114B (en) | 2021-06-30 | 2021-06-30 | Underground barrier-based ground current protection method for buried pipe network |
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| CN113541114A CN113541114A (en) | 2021-10-22 |
| CN113541114B true CN113541114B (en) | 2023-03-07 |
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| CN114256823B (en) * | 2022-03-01 | 2022-07-12 | 国网江西省电力有限公司电力科学研究院 | Complete device and method for preventing power grid from entering ground and overcurrent for buried oil and gas pipe network |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101392870A (en) * | 2008-09-18 | 2009-03-25 | 国网武汉高压研究院 | Determining and protecting method for influence of extra-high voltage AC pipeline on petroleum and nature gas pipeline |
| CN101944738A (en) * | 2009-07-10 | 2011-01-12 | 杭州碧蕾科技有限公司 | Lightning protection method by grounding nearest point of signal feeder port |
| CN110470723A (en) * | 2019-03-18 | 2019-11-19 | 中国电力科学研究院有限公司 | A kind of buried metal pipeline DC influence of protective layer breakage determines method |
| CN211930256U (en) * | 2020-05-22 | 2020-11-13 | 武汉爱伦菲尼克斯科技有限责任公司 | Lightning protection circuit for protecting box type transformer |
| CN112054460A (en) * | 2020-08-07 | 2020-12-08 | 深圳供电局有限公司 | Tower system |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE466160B (en) * | 1990-10-12 | 1992-01-07 | Statens Vattenfallsverk | DEVICE FOR COMPENSATION OF VARIABLE ELECTRICAL POTENTIAL IN A MEDIUM SURROUNDING A METALLIC PIPE CONDUCT IN THE MEDIUM |
| US6866770B2 (en) * | 2002-06-03 | 2005-03-15 | Corrosion Restoration Technologies, Inc. | Protective ground mat for induced potentials and method therefor |
| CA2966406A1 (en) * | 2014-11-07 | 2016-05-12 | Nkt Cables Group A/S | Grounding conductor, electrical power system and use of grounding conductor |
| CN106021866B (en) * | 2016-05-10 | 2018-07-24 | 清华大学 | The unified calculation method that direct current grounding pole influences AC network and oil-gas pipeline |
-
2021
- 2021-06-30 CN CN202110735649.8A patent/CN113541114B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101392870A (en) * | 2008-09-18 | 2009-03-25 | 国网武汉高压研究院 | Determining and protecting method for influence of extra-high voltage AC pipeline on petroleum and nature gas pipeline |
| CN101944738A (en) * | 2009-07-10 | 2011-01-12 | 杭州碧蕾科技有限公司 | Lightning protection method by grounding nearest point of signal feeder port |
| CN110470723A (en) * | 2019-03-18 | 2019-11-19 | 中国电力科学研究院有限公司 | A kind of buried metal pipeline DC influence of protective layer breakage determines method |
| CN211930256U (en) * | 2020-05-22 | 2020-11-13 | 武汉爱伦菲尼克斯科技有限责任公司 | Lightning protection circuit for protecting box type transformer |
| CN112054460A (en) * | 2020-08-07 | 2020-12-08 | 深圳供电局有限公司 | Tower system |
Non-Patent Citations (1)
| Title |
|---|
| 高压输电线路对埋地钢管的干扰与预防;龚瑞祥;《上海煤气》;20111231;第13-15 * |
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