CN111628304A - Grounding grid system construction method - Google Patents
Grounding grid system construction method Download PDFInfo
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- CN111628304A CN111628304A CN202010602368.0A CN202010602368A CN111628304A CN 111628304 A CN111628304 A CN 111628304A CN 202010602368 A CN202010602368 A CN 202010602368A CN 111628304 A CN111628304 A CN 111628304A
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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
- 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
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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
- H01R4/62—Connections between conductors of different materials; Connections between or with aluminium or steel-core aluminium conductors
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Abstract
A grounding grid system construction method belongs to the field of grounding grids. Firstly, embedding a vertical grounding electrode, wherein the vertical grounding electrode is provided with a pure aluminum skin or an aluminum alloy skin which gives consideration to the flow scattering effect on the basis of large surface area, and the pure aluminum skin and the outer surface of the aluminum alloy skin are treated by a conductive oxidation method to form a conductive protective layer; then laying a horizontal grounding electrode, wherein the horizontal grounding electrode has a cylindrical pure aluminum skin or an aluminum alloy skin which has heat dissipation effect on the basis of flow dissipation and pressure equalization effect, and the pure aluminum skin and the outer surface of the aluminum alloy skin are treated by a conductive oxidation method to form a conductive protective layer; the vertical ground and the horizontal ground are then electrically connected. The constructed grounding grid system is in practical fit, corrosion-resistant and long in service life, and can maximally consider the current dispersion and voltage sharing effects of power frequency current and lightning current.
Description
Technical Field
The invention relates to the technical field of grounding networks, in particular to a grounding network system construction method.
Background
The grounding device is an important component of an overhead transmission line, the conventional grounding device of the transmission line is mainly buried underground by a comprehensive grounding device consisting of galvanized round steel, but the resistivity of steel is higher than that of copper and aluminum, the corrosion speed of the steel in soil is higher, the steel cannot have the same service life as other components of the transmission line, and the steel needs to be periodically checked and replaced. While copper materials are high in price and poor in economical efficiency when used as grounding materials, common aluminum or aluminum alloy materials are naturally oxidized in air to form compact high-insulation oxide films, and cannot be directly used as grounding materials.
In the grounding grid system, the horizontal grounding grid has the functions of voltage equalization, reduction of contact voltage and step voltage, and current dissipation. The difference between the horizontal grounding electrode and the vertical grounding electrode is as follows: the vertical grounding electrode is mainly used for dissipating and leaking lightning current, and the horizontal grounding electrode is mainly used for dissipating and leaking power frequency current.
Disclosure of Invention
The invention aims to provide a grounding grid system construction method, which aims to solve the technical problem that a grounding grid constructed by the existing grounding grid system construction method cannot give consideration to corrosion resistance, current dissipation effect and heat dissipation effect.
In order to solve the technical problems, the following technical scheme can be selected according to the needs:
a grounding grid system construction method comprises the following steps:
burying a vertical grounding electrode, wherein a conductor part of the vertical grounding electrode is composed of a first conductor, the first conductor is a hollow pure aluminum conductor or a hollow aluminum alloy conductor, the cross section of the first conductor is in a ring shape, the outer diameter of the ring shape is 40-50 mm, the wall thickness of the ring shape is 3.5-5.0 mm, and the outer surface of the first conductor is treated by a conductive oxidation method to form a conductive protective layer;
laying a horizontal grounding electrode, wherein the horizontal grounding electrode comprises a third conductor and a fourth conductor, the third conductor is coated on the surface of the fourth conductor and is non-detachably connected with the fourth conductor, the third conductor is a hollow pure aluminum conductor or a hollow aluminum alloy conductor, the fourth conductor is round steel, the thickness of the third conductor is 0.2-0.5 mm, and the outer surface of the third conductor is treated by a conductive oxidation method to form a conductive protective layer;
the vertical grounding electrode and the horizontal grounding electrode are electrically connected.
A grounding grid system construction method comprises the following steps:
burying a vertical grounding electrode, wherein a conductor part of the vertical grounding electrode is composed of a first conductor, the first conductor is a hollow pure aluminum conductor or a hollow aluminum alloy conductor, the cross section of the first conductor is in a ring shape, the outer diameter of the ring shape is 40-50 mm, the wall thickness of the ring shape is 3.5-5.0 mm, and the outer surface of the first conductor is treated by a conductive oxidation method to form a conductive protective layer;
laying a horizontal grounding electrode, wherein the horizontal grounding electrode comprises a third conductor, the third conductor is a solid pure aluminum conductor or a solid pure aluminum alloy conductor, the cross section of the third conductor is circular, the diameter of the circle is 10-12 mm, and the outer surface of the third conductor is treated by a conductive oxidation method to form a conductive protective layer;
and welding the vertical grounding electrode and the horizontal grounding electrode.
A grounding grid system construction method comprises the following steps:
burying a vertical grounding electrode, wherein the vertical grounding electrode comprises a first conductor and a second conductor, the first conductor is coated on the surface of the second conductor and is in non-detachable connection with the second conductor, the first conductor is a hollow pure aluminum conductor or a hollow aluminum alloy conductor, the second conductor is angle steel or flat steel, the thickness of the first conductor is 0.2 mm-0.5 mm, and the outer surface of the first conductor is treated by a conductive oxidation method to form a conductive protective layer;
laying a horizontal grounding electrode, wherein the horizontal grounding electrode comprises a third conductor and a fourth conductor, the third conductor is coated on the surface of the fourth conductor and is non-detachably connected with the fourth conductor, the third conductor is a hollow pure aluminum conductor or a hollow aluminum alloy conductor, the fourth conductor is round steel, the thickness of the third conductor is 0.2-0.5 mm, and the outer surface of the third conductor is treated by a conductive oxidation method to form a conductive protective layer;
the vertical grounding electrode and the horizontal grounding electrode are electrically connected.
A grounding grid system construction method comprises the following steps:
burying a vertical grounding electrode, wherein the vertical grounding electrode comprises a first conductor and a second conductor, the first conductor is coated on the surface of the second conductor and is in non-detachable connection with the second conductor, the first conductor is a hollow pure aluminum conductor or a hollow aluminum alloy conductor, the second conductor is angle steel or flat steel, the thickness of the first conductor is 0.2 mm-0.5 mm, and the outer surface of the first conductor is treated by a conductive oxidation method to form a conductive protective layer;
laying a horizontal grounding electrode, wherein the horizontal grounding electrode comprises a third conductor, the third conductor is a solid pure aluminum conductor or a solid pure aluminum alloy conductor, the cross section of the third conductor is circular, the diameter of the circle is 10-12 mm, and the outer surface of the third conductor is treated by a conductive oxidation method to form a conductive protective layer;
and welding the vertical grounding electrode and the horizontal grounding electrode.
Compared with the prior art, the invention has the beneficial effects that:
1. in the grounding grid system, the difference between the horizontal grounding electrode and the vertical grounding electrode is as follows: the vertical grounding electrode is mainly used for dissipating and discharging lightning current, and the end part of the vertical grounding electrode is obvious in current dissipation and temperature rise; the horizontal grounding electrode is mainly used for dissipating and discharging power frequency current, the current dissipation effect is uniform, and the temperature rise phenomenon at the end part also exists; under the same test parameters, the temperature rise speed and amplitude of the end part of the horizontal grounding electrode are lower than those of the vertical grounding electrode. Based on the consideration, the primary consideration of the horizontal grounding electrode is the current dispersion effect, and the secondary consideration is the heat dissipation effect; the primary consideration of the vertical grounding electrode is the heat dissipation effect, and the secondary consideration is the current dissipation effect. According to the invention, the conductive protective layer overcomes the defect of non-conductivity of aluminum oxide, is beneficial to dissipating current, is corrosion-resistant and has long service life; the vertical grounding electrode formed by the hollow pure aluminum conductor or the hollow aluminum alloy conductor has large surface area and good heat dissipation effect; the surface area of the vertical grounding electrode formed by wrapping angle steel or flat steel with the hollow pure aluminum conductor or the hollow aluminum alloy conductor is large, and the heat dissipation effect is superior to that of round steel; the hollow pure aluminum conductor or the hollow aluminum alloy conductor wraps the horizontal grounding electrode formed by the round steel, the flow dispersion effect and the pressure equalizing effect of the hollow pure aluminum conductor or the hollow aluminum alloy conductor are superior to those of the vertical grounding electrode, and the heat dissipation effect of the hollow pure aluminum conductor or the hollow aluminum alloy conductor is also superior to those of a common steel grounding electrode and a galvanized steel grounding electrode; the horizontal grounding electrode formed by the solid pure aluminum conductor or the solid pure aluminum alloy conductor has better current dissipation effect and voltage-sharing effect than the vertical grounding electrode, and the heat dissipation effect is better than the common steel grounding electrode and the galvanized steel grounding electrode.
Drawings
Fig. 1 is a cross-sectional view of a vertical ground electrode of a grounding grid system of the present invention.
Fig. 2 is a cross-sectional view of yet another vertical ground electrode of a grounding grid system of the present invention.
Fig. 3 is a cross-sectional view of yet another vertical ground of the grounding grid system of the present invention.
Fig. 4 is a cross-sectional view of a horizontal ground electrode of a grounding grid system of the present invention.
Fig. 5 is a cross-sectional view of yet another horizontal ground electrode of a grounding grid system of the present invention.
The reference numbers indicate, 10-the second conductor, 11-the first conductor, 110-the first conductor body, 111-the conductive shield, 112-the conductive shield, 20-the fourth conductor, 21-the third conductor, 210-the third conductor body, 211-the conductive shield.
Detailed Description
The present invention is described below in terms of embodiments in conjunction with the accompanying drawings to assist those skilled in the art in understanding and implementing the present invention. Unless otherwise indicated, the following embodiments and technical terms therein should not be understood to depart from the background of the technical knowledge in the technical field.
The length units are in millimeters (mm) unless otherwise specified below.
In the prior art, the following general knowledge exists in the field of grounding systems.
The skin effect coefficient of a conductor is related to the frequency of the current, the shape and size of the conductor.
In the grounding grid, the horizontal grounding wire is beneficial to dissipating and discharging power frequency current, and the vertical grounding wire is beneficial to dissipating and discharging lightning current.
In an effective grounding system and a low-resistance grounding system, the short-time temperature of a steel grounding wire should not exceed 400 ℃, and the short-time temperature of a copper grounding wire should not exceed 450 ℃. When the thermal qualitative of the grounding wire of the electrical equipment in the ungrounded, arc suppression coil grounded and high-resistance grounding system is verified, the temperature of the grounding wire laid under the ground is not higher than 100 ℃ for a long time.
The principle of the conductive oxidation method for preparing the conductive protective film is related to the following reaction formula:
example 1: a grounding grid system construction method comprises the following steps:
burying a vertical grounding electrode, wherein a conductor part of the vertical grounding electrode is formed by a first conductor 11, the first conductor 11 is a hollow pure aluminum conductor or a hollow aluminum alloy conductor, the cross section of the first conductor 11 is in a circular ring shape, the outer diameter of the circular ring shape is 40-50 mm, the wall thickness of the circular ring shape is 3.5-5.0 mm, and the outer surface of the first conductor 11 is treated by a conductive oxidation method to form a conductive protective layer 111;
laying a horizontal grounding electrode, wherein fig. 5 shows the horizontal grounding electrode, the horizontal grounding electrode comprises a third conductor 21 and a fourth conductor 20, the third conductor 21 is coated on the surface of the fourth conductor 20 and is undetachably connected with the fourth conductor 20, the third conductor 21 is a hollow pure aluminum conductor or a hollow aluminum alloy conductor, the fourth conductor 20 is round steel, the thickness of the third conductor 21 is 0.2 mm-0.5 mm, and the outer surface of the third conductor 21 is treated by a conductive oxidation method to form a conductive protective layer 211;
the vertical grounding electrode and the horizontal grounding electrode are electrically connected.
Example 2: a grounding grid system construction method comprises the following steps:
burying a vertical grounding electrode, wherein a conductor part of the vertical grounding electrode is formed by a first conductor 11, the first conductor 11 is a hollow pure aluminum conductor or a hollow aluminum alloy conductor, the cross section of the first conductor 11 is in a circular ring shape, the outer diameter of the circular ring shape is 40-50 mm, the wall thickness of the circular ring shape is 3.5-5.0 mm, and the outer surface of the first conductor 11 is treated by a conductive oxidation method to form a conductive protective layer 111;
laying a horizontal grounding electrode, wherein fig. 4 shows a horizontal grounding electrode, the horizontal grounding electrode comprises a third conductor 21, the third conductor 21 is a solid pure aluminum conductor or a solid pure aluminum alloy conductor, the cross section of the third conductor 21 is circular, the diameter of the circle is 10-12 mm, and the outer surface of the third conductor 21 is treated by a conductive oxidation method to form a conductive protection layer 211;
and welding the vertical grounding electrode and the horizontal grounding electrode.
Example 3: a grounding grid system construction method comprises the following steps:
burying a vertical grounding electrode, wherein a vertical grounding electrode is respectively shown in fig. 2 and fig. 3, and referring to fig. 2, the vertical grounding electrode comprises a first conductor 11 and a second conductor 10, the first conductor 11 is coated on the surface of the second conductor 10 and is undetachably connected with the second conductor 10, the first conductor 11 is a hollow pure aluminum conductor or a hollow aluminum alloy conductor, the second conductor 10 is flat steel, the thickness of the first conductor 11 is 0.2 mm-0.5 mm, and the outer surface of the first conductor 11 is treated by a conductive oxidation method to form a conductive protection layer 111; referring to fig. 3, the vertical ground electrode includes a first conductor 11 and a second conductor 10, the first conductor 11 is coated on the surface of the second conductor 10 and is non-detachably connected with the second conductor 10, the first conductor 11 is a hollow pure aluminum conductor or a hollow aluminum alloy conductor, the second conductor 10 is an angle steel or a flat steel, the thickness of the first conductor 11 is 0.2mm to 0.5mm, and the outer surface of the first conductor 11 is treated by a conductive oxidation method to form a conductive protection layer 111;
laying a horizontal grounding electrode, wherein fig. 5 shows the horizontal grounding electrode, the horizontal grounding electrode comprises a third conductor 21 and a fourth conductor 20, the third conductor 21 is coated on the surface of the fourth conductor 20 and is undetachably connected with the fourth conductor 20, the third conductor 21 is a hollow pure aluminum conductor or a hollow aluminum alloy conductor, the fourth conductor 20 is round steel, the thickness of the third conductor 21 is 0.2 mm-0.5 mm, and the outer surface of the third conductor 21 is treated by a conductive oxidation method to form a conductive protective layer 211;
the vertical grounding electrode and the horizontal grounding electrode are electrically connected.
Example 4: a grounding grid system construction method comprises the following steps:
burying a vertical grounding electrode, burying the vertical grounding electrode, and respectively showing a vertical grounding electrode in fig. 2 and fig. 3, referring to fig. 2, the vertical grounding electrode comprises a first conductor 11 and a second conductor 10, wherein the first conductor 11 is coated on the surface of the second conductor 10 and is undetachably connected with the second conductor 10, the first conductor 11 is a hollow pure aluminum conductor or a hollow aluminum alloy conductor, the second conductor 10 is flat steel, the thickness of the first conductor 11 is 0.2 mm-0.5 mm, and the outer surface of the first conductor 11 is treated by a conductive oxidation method to form a conductive protection layer 111; referring to fig. 3, the vertical ground electrode includes a first conductor 11 and a second conductor 10, the first conductor 11 is coated on the surface of the second conductor 10 and is non-detachably connected with the second conductor 10, the first conductor 11 is a hollow pure aluminum conductor or a hollow aluminum alloy conductor, the second conductor 10 is an angle steel or a flat steel, the thickness of the first conductor 11 is 0.2mm to 0.5mm, and the outer surface of the first conductor 11 is treated by a conductive oxidation method to form a conductive protection layer 111;
laying a horizontal grounding electrode, wherein fig. 4 shows a horizontal grounding electrode, the horizontal grounding electrode comprises a third conductor 21, the third conductor 21 is a solid pure aluminum conductor or a solid pure aluminum alloy conductor, the cross section of the third conductor 21 is circular, the diameter of the circle is 10-12 mm, and the outer surface of the third conductor 21 is treated by a conductive oxidation method to form a conductive protection layer 211;
and welding the vertical grounding electrode and the horizontal grounding electrode.
The invention is described in detail above with reference to the figures and examples. It should be understood that in practice it is not intended to be exhaustive of all possible embodiments, and the inventive concepts of the present invention are presented herein by way of illustration. Without departing from the inventive concept of the present invention and without any creative work, a person skilled in the art should, in all of the embodiments, make optional combinations of technical features and experimental changes of specific parameters, or make a routine replacement of the disclosed technical means by using the prior art in the technical field to form specific embodiments, which belong to the content implicitly disclosed by the present invention.
Claims (4)
1. A grounding grid system construction method is characterized by comprising the following steps:
burying a vertical grounding electrode, wherein a conductor part of the vertical grounding electrode is composed of a first conductor, the first conductor is a hollow pure aluminum conductor or a hollow aluminum alloy conductor, the cross section of the first conductor is in a ring shape, the outer diameter of the ring shape is 40-50 mm, the wall thickness of the ring shape is 3.5-5.0 mm, and the outer surface of the first conductor is treated by a conductive oxidation method to form a conductive protective layer;
laying a horizontal grounding electrode, wherein the horizontal grounding electrode comprises a third conductor and a fourth conductor, the third conductor is coated on the surface of the fourth conductor and is non-detachably connected with the fourth conductor, the third conductor is a hollow pure aluminum conductor or a hollow aluminum alloy conductor, the fourth conductor is round steel, the thickness of the third conductor is 0.2-0.5 mm, and the outer surface of the third conductor is treated by a conductive oxidation method to form a conductive protective layer;
the vertical grounding electrode and the horizontal grounding electrode are electrically connected.
2. A grounding grid system construction method is characterized by comprising the following steps:
burying a vertical grounding electrode, wherein a conductor part of the vertical grounding electrode is composed of a first conductor, the first conductor is a hollow pure aluminum conductor or a hollow aluminum alloy conductor, the cross section of the first conductor is in a ring shape, the outer diameter of the ring shape is 40-50 mm, the wall thickness of the ring shape is 3.5-5.0 mm, and the outer surface of the first conductor is treated by a conductive oxidation method to form a conductive protective layer;
laying a horizontal grounding electrode, wherein the horizontal grounding electrode comprises a third conductor, the third conductor is a solid pure aluminum conductor or a solid pure aluminum alloy conductor, the cross section of the third conductor is circular, the diameter of the circle is 10-12 mm, and the outer surface of the third conductor is treated by a conductive oxidation method to form a conductive protective layer;
and welding the vertical grounding electrode and the horizontal grounding electrode.
3. A grounding grid system construction method is characterized by comprising the following steps:
burying a vertical grounding electrode, wherein the vertical grounding electrode comprises a first conductor and a second conductor, the first conductor is coated on the surface of the second conductor and is in non-detachable connection with the second conductor, the first conductor is a hollow pure aluminum conductor or a hollow aluminum alloy conductor, the second conductor is angle steel or flat steel, the thickness of the first conductor is 0.2 mm-0.5 mm, and the outer surface of the first conductor is treated by a conductive oxidation method to form a conductive protective layer;
laying a horizontal grounding electrode, wherein the horizontal grounding electrode comprises a third conductor and a fourth conductor, the third conductor is coated on the surface of the fourth conductor and is non-detachably connected with the fourth conductor, the third conductor is a hollow pure aluminum conductor or a hollow aluminum alloy conductor, the fourth conductor is round steel, the thickness of the third conductor is 0.2-0.5 mm, and the outer surface of the third conductor is treated by a conductive oxidation method to form a conductive protective layer;
the vertical grounding electrode and the horizontal grounding electrode are electrically connected.
4. A grounding grid system construction method is characterized by comprising the following steps:
burying a vertical grounding electrode, wherein the vertical grounding electrode comprises a first conductor and a second conductor, the first conductor is coated on the surface of the second conductor and is in non-detachable connection with the second conductor, the first conductor is a hollow pure aluminum conductor or a hollow aluminum alloy conductor, the second conductor is angle steel or flat steel, the thickness of the first conductor is 0.2 mm-0.5 mm, and the outer surface of the first conductor is treated by a conductive oxidation method to form a conductive protective layer;
laying a horizontal grounding electrode, wherein the horizontal grounding electrode comprises a third conductor, the third conductor is a solid pure aluminum conductor or a solid pure aluminum alloy conductor, the cross section of the third conductor is circular, the diameter of the circle is 10-12 mm, and the outer surface of the third conductor is treated by a conductive oxidation method to form a conductive protective layer;
and welding the vertical grounding electrode and the horizontal grounding electrode.
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| CN106374242A (en) * | 2016-10-28 | 2017-02-01 | 国网江西省电力公司萍乡供电分公司 | Grounding grid built by using steel pipe pole pile foundation |
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Application publication date: 20200904 |
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| RJ01 | Rejection of invention patent application after publication |