CN115603067A - Graphite resistance reducing agent for tower grounding device and construction method - Google Patents

Graphite resistance reducing agent for tower grounding device and construction method Download PDF

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Publication number
CN115603067A
CN115603067A CN202210197837.4A CN202210197837A CN115603067A CN 115603067 A CN115603067 A CN 115603067A CN 202210197837 A CN202210197837 A CN 202210197837A CN 115603067 A CN115603067 A CN 115603067A
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China
Prior art keywords
grounding
pit
reducing agent
resistance reducing
head
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CN202210197837.4A
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Chinese (zh)
Inventor
谭金河
李望增
翟荣斌
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Taiyuan Heyuan Electric Power Technology Co ltd
Yuncheng Power Supply Co of State Grid Shanxi Electric Power Co Ltd
Original Assignee
Taiyuan Heyuan Electric Power Technology Co ltd
Yuncheng Power Supply Co of State Grid Shanxi Electric Power Co Ltd
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Application filed by Taiyuan Heyuan Electric Power Technology Co ltd, Yuncheng Power Supply Co of State Grid Shanxi Electric Power Co Ltd filed Critical Taiyuan Heyuan Electric Power Technology Co ltd
Priority to CN202210197837.4A priority Critical patent/CN115603067A/en
Publication of CN115603067A publication Critical patent/CN115603067A/en
Pending legal-status Critical Current

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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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
    • H01B1/06—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of other non-metallic substances
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R43/00—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacturing Of Electrical Connectors (AREA)

Abstract

The invention discloses a graphite resistance reducing agent for a tower grounding device and a construction method, wherein the graphite resistance reducing agent comprises graphite, conductive cement, aluminum hydroxide and water, the graphite, the conductive cement and the aluminum hydroxide are mixed to form a dry graphite resistance reducing agent product, the ratio of the graphite to the conductive cement to the aluminum hydroxide is 6. The invention aims to provide a graphite resistance reducing agent for a tower grounding device and a construction method, which not only can meet the good resistance reducing effect, but also can meet the requirement of simple field operation.

Description

Graphite resistance reducing agent for tower grounding device and construction method
Technical Field
The invention relates to the technical field of tower grounding devices, in particular to a graphite resistance reducing agent for a tower grounding device and a construction method.
Background
Nowadays, the dependence degree of people on electric power is gradually deepened in production and life, and electric power supply is also increasingly becoming an essential component of people in production and life. Due to the rapid development of various industries, the power demand is always in an increasing situation, and the development of the power industry is more and more emphasized by the nation.
The transmission line is influenced by the terrain and the climate, and potential safety hazards of lightning trip exist. Some lightning protection measures at present can have partial lightning protection effect, but can greatly increase the one-time investment and later-stage operation and maintenance burden of corresponding equipment. Therefore, from the long-term economy and stability perspectives, the optimal method for reducing the lightning trip-out accident rate of the line and increasing the lightning withstand level of the line is to ensure the good grounding performance of the grounding network of the power transmission line tower.
In order to reduce the grounding grid of the power transmission line tower which operates on line to be below a standard limit value, auxiliary means such as a resistance reducing agent and an epitaxial grounding body are required to be adopted to reduce the resistance of part of areas with high soil resistivity. Among them, the use of resistance reducing agent to reduce resistance is still more common in practical engineering. Resistance reducers have found a wide range of use in grid grounding systems. However, the existing resistance reducing agents are various in types, the quality of the resistance reducing agents is difficult to guarantee, and the construction process has large deviation. In addition, the use amount and the use position of the conventional resistance reducing agent are not clearly specified, the actual use process is often carried out by experience, and the resistance reducing effect cannot completely meet the requirement. In addition, the use of a friction reducer can also cause some corrosion of the earth-grid metal. Therefore, it is very important to provide an effective resistance reduction strategy for the tower grounding grid under high soil resistivity.
Disclosure of Invention
According to the defects of the prior art, the invention aims to provide a graphite resistance reducing agent for a tower grounding device and a construction method, and provides a novel graphite resistance reducing agent, so that the requirements of good resistance reducing effect and simple field operation are met, and when the graphite resistance reducing agent is used, the graphite resistance reducing agent is injected around the tower grounding device to isolate the grounding body from contacting with soil, so that the contact resistance of a contact surface is greatly reduced, and the grounding performance of the grounding device in a soil resistivity area is improved.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a graphite resistance reducing agent for a tower grounding device comprises graphite, conductive cement, aluminum hydroxide and water, wherein the graphite, the conductive cement and the aluminum hydroxide are mixed to form a dry graphite resistance reducing agent product, the ratio of the graphite to the conductive cement to the aluminum hydroxide is 6.
A construction method of a tower grounding device comprises the following steps:
step 1, selecting the position of a grounding electrode, and excavating a circular grounding pit with the diameter of 150mm and the depth of 3000-6000 mm;
step 2, after the circular grounding pit reaches the designed elevation, checking the hole depth, the hole diameter and the verticality of the circular grounding pit, and controlling the hole depth, the hole diameter and the verticality of the circular grounding pit within a reasonable range;
step 3, ensuring the surface of the grounding electrode to be clean, placing the prefabricated vertical grounding electrode with the diameter of 20mm and the length of 2500mm in the center of the circular grounding pit, and driving the vertical grounding electrode into the bottom of the circular grounding pit by 300mm;
step 4, cleaning stone slag around the circular grounding pit, and wetting the inner wall of the circular grounding pit with water;
step 5, putting the rod piece and the grounding electrode which form the vertical grounding body into the drilled circular grounding pit in sequence;
filling, namely filling the graphite resistance reducing agent into the circular grounding pit, and filling and compacting a gap between the rod body and the wall of the circular grounding pit;
and 7, ensuring that the soil on the periphery of the circular grounding pit does not fall to the periphery of the grounding electrode.
Further, the circular pit is excavated by a mechanical luoyang shovel.
Further, in the step 6, after the graphite resistance reducing agent is poured into the container every 200-300 mm, the graphite resistance reducing agent is compacted by a wood stick and then continuously poured into the container until the distance from the ground is about 200mm, and then the graphite resistance reducing agent is backfilled and compacted.
Further, the member includes ground connection downlead and copper-plated steel bar, many the copper-plated steel bar links to each other in proper order, ground connection downlead and one at the top the copper-plated steel bar links to each other through first mounting, adjacent two the copper-plated steel bar passes through the second mounting and links to each other, the second mounting includes first head, connector and second head, first head with the second head is established respectively the both ends of connector, first head is open-top tubular structure, the second head is bottom open-ended tubular structure, first head with the second head inboard all is equipped with annular buckle, be equipped with back-off and first latch on the annular buckle, the back-off rotationally connects the inboard of annular buckle, first head with the second head outside all is equipped with the retaining member, the retaining member support lean on the annular buckle and with first head or the second head rotationally connects, the top and the bottom of copper-plated steel bar all are equipped with another copper-plated steel bar top respectively, the second latch can with first latch cooperation, first head with a second cover is established.
And further, filling 100-200 mm of filler into the bottom of the circular grounding pit, and then sequentially putting down the rods by connecting the copper-plated steel rods and inserting the copper-plated steel rods downwards until the rod is inserted to the bottom of the hole from the ground.
Further, the copper-plated steel bar is placed manually by means of rope binding and shoulder lifting.
Further, the plating of the copper-plated steel bar may not be damaged when the second fixing member is tightened using a tool.
Further, first mounting includes connecting plate and cover shell, the connecting plate with the ground connection downlead is fixed, the cover shell is fixed copper-plated rod iron top.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. according to the graphite resistance reducing agent for the tower grounding device and the construction method, the optimal ratio of the raw materials to the water, which meets the requirements of good resistance reducing effect and simple field operation, is obtained for the graphite resistance reducing agent commonly used in engineering on the basis of combining laboratory tests and engineering practice. The field application shows that the grounding device has a good resistance reducing effect, can reduce the contact resistance between the grounding electrode and the soil, and can equivalently increase the diameter of the grounding electrode, thereby effectively reducing the size of the stray current resistance value of the grounding device.
2. The graphite resistance reducing agent for the tower grounding device and the construction method thereof provided by the invention are used for carrying out the hole forming construction of the grounding pit of the vertical grounding body, thereby realizing mechanical operation. The standard operation process is formed on the basis of combining the actual field for the operations of hole forming, vertical grounding body lower rod and graphite resistance reducing agent filling, so that the construction of the tower vertical grounding body is more scientific, reasonable and standard.
Drawings
FIG. 1 is a schematic diagram of graphite resistance reducing agent construction;
FIG. 2 is a construction flow chart of the present invention;
fig. 3 is a schematic view of the internal structure of a second fixing member of the tower vertical grounding device according to the present invention;
FIG. 4 is a schematic view of the structure of the invention showing the cooperation of the annular buckle and the copper-plated steel bar;
fig. 5 is a schematic view of a horizontal ray grounding device.
Wherein: 1. a down conductor; 2. plating copper on a steel bar; 21. a second latch; 3. a first fixing member; 31. a connecting plate; 32. a housing; 4. a second fixing member; 41. a first head; 42. a connector; 43. a second head; 44. an annular buckle; 45. reversing; 46. a first latch; 47. a locking member; 5. a graphite resistance reducing agent; 6. and (6) backfilling soil.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate a number of the indicated technical features. Thus, a feature defined as "first," "second," etc. 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.
Example 1.
The invention provides a graphite resistance reducing agent for a tower grounding device, which comprises graphite, conductive cement, aluminum hydroxide and water, wherein the graphite, the conductive cement and the aluminum hydroxide are mixed to form a dry graphite resistance reducing agent product, the proportion of the graphite, the conductive cement and the aluminum hydroxide is 6.
The graphite resistance reducing agent dry product is tested, and rho is obtained in the full dry process 0 =0.0138 Ω · m; at 2% water spray, ρ 2 =0.0127 Ω · m; at 5% of water spray, rho 5 =0.00935 Ω · m; at 10% of water spray, rho 10 =0.0069 Ω · m; at 20% of water spray, p 20 =0.0455 Ω · m, and it is seen that 5% to 10% of water spray is the most preferable. Therefore, when the graphite resistance reducing agent is used, the dry graphite resistance reducing agent is mixed with water to form the graphite resistance reducing agent 5, wherein the water content is 5-10 percent。
If the graphite powder originally has moisture, spraying can be omitted or a small amount of the graphite powder can be sprayed.
The invention provides a graphite resistance reducing agent for a tower grounding device on the basis of combining laboratory tests and engineering practice, and the optimal ratio of raw materials to water which meets the requirements of good resistance reducing effect and simple field operation is obtained. The field application shows that the grounding device has a good resistance reducing effect, can reduce the contact resistance between the grounding electrode and the soil, and can equivalently increase the diameter of the grounding electrode, thereby effectively reducing the size of the current scattering resistance value of the grounding device and improving the grounding performance of the grounding device in a soil resistivity area.
A construction method of a tower grounding device, which uses the graphite resistance reducing agent 5, as shown in fig. 2, includes:
step 1, selecting the position of a grounding electrode, and excavating a circular grounding pit with the diameter of 150mm and the depth of 3000-6000 mm;
step 2, after the formed hole reaches the designed elevation, checking the hole depth, the hole diameter and the verticality of the circular grounding pit, and controlling the hole depth, the hole diameter and the verticality of the circular grounding pit within a reasonable range;
step 3, ensuring the surface of the grounding electrode to be clean, placing the prefabricated vertical grounding electrode with the diameter of 20mm and the length of 2500mm in the center of the circular grounding pit, and driving the vertical grounding electrode into the bottom of the circular grounding pit by 300mm;
step 4, cleaning stone slag around the circular grounding pit, and wetting the inner wall of the circular grounding pit with water;
step 5, putting the rod piece and the grounding electrode which form the vertical grounding body into the drilled circular grounding pit in sequence;
filling, namely filling the graphite resistance reducing agent 5 into the circular grounding pit, and filling and compacting a gap between the rod body and the wall of the circular grounding pit;
and 7, ensuring that the soil on the periphery of the circular grounding pit does not fall to the periphery of the grounding electrode.
In the step 1, the circular grounding pit is excavated through a mechanical Luoyang shovel, and the hole forming construction of the grounding pit of the vertical grounding body is carried out, so that the mechanical operation is realized. The hole forming, the vertical grounding body lower rod and the graphite resistance reducing agent 5 filling operation are combined to form a standardized operation flow on the basis of on-site practice, so that the construction of the tower vertical grounding body is more scientific, reasonable and standard.
And the graphite resistance reducing agent 5 and the construction method by utilizing the mechanical Luoyang shovel are simple, convenient and easy to operate, and can keep good effects for a long time. The mechanical Luoyang shovel has deep drilling hole, is suitable for most areas, and can meet the requirements of site construction of horizontal and vertical grounding devices.
In step 6, after the graphite resistance reducing agent 5 is poured into the container every time 200-300 mm, the graphite resistance reducing agent is compacted by a wood stick and then continuously poured into the container until the distance from the ground is about 200mm, and then the graphite resistance reducing agent is compacted by backfill soil 6.
In step 5, specifically, as shown in fig. 1, 3 and 4, the rod provided by the present invention includes a ground down lead 1 and a copper-plated steel bar 2, the multiple copper-plated steel bars 2 are sequentially connected, the ground down lead 1 and a topmost copper-plated steel bar 2 are connected through a first fixing member 3, two adjacent copper-plated steel bars 2 are connected through a second fixing member 4, the second fixing member 4 includes a first head 41, a connecting member 42 and a second head 43, the first head 41 and the second head 43 are respectively disposed at two ends of the connecting member 42, the first head 41 is a cylindrical structure with an open top, the second head 43 is a cylindrical structure with an open bottom, an annular buckle 44 is disposed inside each of the first head 41 and the second head 43, an inverted buckle 45 and a first latch 46 are disposed on the annular buckle 44, the inverted buckle 45 is rotatably connected inside the annular buckle 44, a locking member 47 is disposed outside each of the first head 41 and the second head 43, the locking member 47 abuts against the annular buckle 44 and is rotatably connected to the first head 41 or the second head 43, a second latch 21 is disposed at the top and the bottom of the steel bar 2, and the second latch 21 can be respectively fitted with the other copper-plated steel bar 2.
Preferably, 100-200 mm of filler is filled into the bottom of the circular grounding pit, and then the rods are sequentially placed by connecting the copper-plated steel rod 2 and inserting the copper-plated steel rod 2 downwards until the rod is inserted into the bottom of the hole from the ground.
Preferably, because the adopted copper-plated steel bar 2 is light in weight, the copper-plated steel bar 2 is placed manually by means of rope binding and shoulder lifting.
Preferably, the coating of the copper-plated steel bar 2 is not damaged when the second fixing member 4 is tightened using a tool.
As shown in fig. 1, the first fixing element 3 comprises a connecting plate 31 and a jacket 32, the connecting plate 31 is fixed with the ground down conductor 1, and the jacket 32 is fixed on the top of the copper-plated steel bar 2.
Example 2.
The horizontal ray earth mat shown in fig. 5 is located on a mountain top plane, the local soil resistivity is 1560 Ω · m, the buried soil of the original ray is dug up, and the graphite friction reducer 5 of the present invention is poured in. Through testing, the grounding resistance is reduced to 20 omega from the original 26 omega, and the requirement of a grounding limit value of 25 omega is met. Because the original soil is not cleaned and the surface of the round steel is rusted, the resistance reducing effect is not expected, but is reduced by 23.08 percent.
The comparison shows that the effect of the graphite resistance reducer 5 on reducing the grounding resistance is sufficiently positive compared with the buried original soil. And the filling amount of the horizontal grounding body is less than that of the vertical grounding body, and the horizontal grounding device and the graphite resistance reducing agent 5 are simpler and more cost-effective to carry out grounding resistance reduction in a mountain area with high soil resistivity.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (9)

1. The utility model provides a graphite resistance reducing agent for shaft tower earthing device which characterized in that: the graphite resistance reducing agent comprises graphite, conductive cement, aluminum hydroxide and water, wherein the graphite, the conductive cement and the aluminum hydroxide are mixed to form a graphite resistance reducing agent dry product, the ratio of the graphite to the conductive cement to the aluminum hydroxide is 6.
2. A construction method of a tower grounding device is characterized by comprising the following steps:
step 1, selecting the position of a grounding electrode, and excavating a circular grounding pit with the diameter of 150mm and the depth of 3000-6000 mm;
step 2, after the formed hole reaches the designed elevation, checking the hole depth, the hole diameter and the verticality of the circular grounding pit, and controlling the hole depth, the hole diameter and the verticality of the circular grounding pit within a reasonable range;
step 3, ensuring the surface of the grounding electrode to be clean, placing the prefabricated vertical grounding electrode with the diameter of 20mm and the length of 2500mm in the center of the circular grounding pit, and driving the vertical grounding electrode into the bottom of the circular grounding pit by 300mm;
step 4, cleaning stone slag around the circular grounding pit, and wetting the inner wall of the circular grounding pit with water;
step 5, putting the rod piece and the grounding electrode which form the vertical grounding body into the drilled circular grounding pit in sequence;
filling, namely filling the graphite resistance reducing agent into the circular grounding pit, and filling and compacting a gap between the rod body and the wall of the circular grounding pit;
and 7, ensuring that the soil on the periphery of the circular grounding pit is not completely fallen to the periphery of the grounding electrode.
3. The construction method of the tower grounding device according to claim 2, wherein: and the circular ground pit is excavated by a mechanical Luoyang shovel.
4. The construction method of the tower grounding device according to claim 2, wherein: in the step 6, after the graphite resistance reducing agent is poured into the container every time 200-300 mm, the graphite resistance reducing agent is tamped by a wood stick and then is poured into the container continuously, and when the graphite resistance reducing agent is about 200mm away from the ground, the graphite resistance reducing agent is backfilled and tamped.
5. The construction method of the tower grounding device according to claim 2, wherein: the rod piece includes ground connection downlead and copper-plated steel bar, many the copper-plated steel bar links to each other in proper order, ground connection downlead and one at top the copper-plated steel bar links to each other through first mounting, and adjacent two the copper-plated steel bar passes through the second mounting and links to each other, the second mounting includes first head, connector and second head, first head with the second head is established respectively the both ends of connector, first head is open-top tubular structure, the second head is bottom open-ended tubular structure, first head with the first inboard of second all is equipped with annular buckle, be equipped with back-off and first latch on the annular buckle, the back-off rotationally connects the inboard of annular buckle, first head with the second first outside all is equipped with the retaining member, the retaining member support lean on the annular buckle and with first head or the second head rotationally connects, the top and the bottom of copper-plated steel bar all are equipped with the second latch, the second latch can with first latch cooperation, first head with the second head is established respectively with another copper-plated steel bar top.
6. The construction method of the tower grounding device according to claim 5, wherein: filling 100-200 mm of filler into the bottom of the circular grounding pit, and then sequentially putting down the rods by connecting the copper-plated steel rods and inserting the copper-plated steel rods downwards until the rod is inserted into the bottom of the hole from the ground.
7. The construction method of the tower grounding device according to claim 5, wherein: the copper-plated steel bar is placed manually by means of rope binding and shoulder lifting.
8. The construction method of the tower grounding device according to claim 5, wherein: when the second fixing piece is screwed down by using a tool, the coating of the copper-plated steel bar cannot be damaged.
9. The construction method of the tower grounding device according to claim 5, wherein: the first fixing piece comprises a connecting plate and a casing, the connecting plate is fixed with the grounding down lead, and the casing is fixed to the top of the copper-plated steel bar.
CN202210197837.4A 2022-03-02 2022-03-02 Graphite resistance reducing agent for tower grounding device and construction method Pending CN115603067A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210197837.4A CN115603067A (en) 2022-03-02 2022-03-02 Graphite resistance reducing agent for tower grounding device and construction method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210197837.4A CN115603067A (en) 2022-03-02 2022-03-02 Graphite resistance reducing agent for tower grounding device and construction method

Publications (1)

Publication Number Publication Date
CN115603067A true CN115603067A (en) 2023-01-13

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Application Number Title Priority Date Filing Date
CN202210197837.4A Pending CN115603067A (en) 2022-03-02 2022-03-02 Graphite resistance reducing agent for tower grounding device and construction method

Country Status (1)

Country Link
CN (1) CN115603067A (en)

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