CN114256823B - Complete device and method for preventing power grid from entering ground and overcurrent for buried oil and gas pipe network - Google Patents
Complete device and method for preventing power grid from entering ground and overcurrent for buried oil and gas pipe network Download PDFInfo
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
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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
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess 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
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Abstract
The invention discloses a complete device and a method for preventing power grid from entering the ground and overcurrent for a buried oil and gas pipe network. According to the invention, the drainage needle is arranged on the oil gas pipeline, and the copper bar and the drainage net are matched to drain and discharge the over-current to deeper soil far away from the oil gas pipeline, so that the potential lifting and direct damage of the over-current to the oil gas pipeline are avoided, the flow of the over-current into the ground to the buried oil gas pipeline is reasonably limited, the potential of the soil near the oil gas pipeline is reduced, the condition of damage to the buried oil gas pipeline caused by the over-current into the ground can be greatly avoided, and the field practicability and the popularization are strong.
Description
Technical Field
The invention belongs to the technical field of electric power engineering, and particularly relates to a complete device and a method for preventing power grid in-ground overcurrent of a buried oil and gas pipe network.
Background
In recent years, with the rapid development of economy in China, the demand of social production and resident life on fossil primary energy such as petroleum and natural gas and electric energy is continuously increased, and the dislocation of energy distribution and consumption in the geographic space in China makes large-scale and long-distance energy transmission necessary. Under the background, numerous power transmission lines and oil and gas transmission pipelines are built in China, and due to the effective utilization of the land resources, the power transmission lines and the oil and gas pipelines are bound to share a common corridor, and a large number of power transmission channels and the oil and gas pipelines are parallel or even cross.
When the transmission tower is struck by lightning or the transmission line has a ground fault, a large ground current can be generated, and the current can flow to a nearby buried oil and gas pipeline and even form an arc discharge channel after entering the soil on the shallow surface layer, so that the oil and gas pipeline is threatened; and, because great electric current distributes in soil, the soil potential can obtain showing promotion, probably forms great potential difference between oil gas pipeline inside and outside wall, leads to oil gas pipeline surface anticorrosive coating to be punctured. If the situation happens, potential safety hazards are caused to the oil and gas pipeline, and fossil energy leakage and even larger safety accidents are caused.
The invention discloses a protection method of a buried oil and gas pipe network aiming at power grid ground faults or lightning strokes, and the invention is CN 202110472231.2.A method of laying a grounding drainage copper bar in parallel along the length direction of an oil and gas pipeline is provided to balance the potential of the oil and gas pipeline and the nearby ground potential, only the rough length range and the approximate arrangement position of the copper bar are specified, and the correlation analysis of the size and the arrangement mode of the copper bar and factors such as the radius of the oil and gas pipeline, the soil resistivity, the maximum ground current, the duration of the ground overcurrent, the distance between the oil and gas pipeline and a tower grounding device and the like is not involved, and the specific implementation method of adjusting the content of the invention according to the actual situation is not realized; and the protective effect of only laying the copper bars on the oil-gas pipeline is not obvious under the condition of large ground current, and a systematic protection scheme on the oil-gas pipeline is not formed.
Disclosure of Invention
The invention aims to provide a complete device for preventing power grid ground-entering over-current of a buried oil and gas pipe network, which can solve the problem that a buried oil and gas pipeline is damaged due to lightning strike on a transmission tower or ground fault of a transmission line in the prior art.
In order to achieve the purpose, the invention adopts the technical scheme that: the utility model provides a bury ground oil gas pipe network and prevent that electric wire netting from going into ground overcurrent integrated equipment, includes the oil gas pipeline, at a plurality of current drainage needles of oil gas pipeline surface via the insulating base installation of oil gas pipeline orientation transmission tower earthing device one side to be provided with first copper bar along the pipeline axial, will flow drainage needle formation electrical connection through first copper bar, be provided with the drainage net in the oil gas pipeline outside of keeping away from transmission tower earthing device direction, the first copper bar is connected through the second copper bar to the drainage net.
Furthermore, one end of the drainage needle is fixed on the side surface of the oil-gas pipeline close to the transmission tower grounding device, and the needle point at the other end faces the tail end of the vertical ray, closest to the oil-gas pipeline, of the transmission tower grounding device.
Further, the oil gas pipeline outside cover is equipped with the staple bolt, and the staple bolt adopts glass fiber reinforcement epoxy material to make, and insulator foot integrated into one piece sets up on the staple bolt, and the drainage needle passes through insulator foot to be fixed on oil gas pipeline surface.
Further, the length L (m) of the drainage needle is larger than the radius R of the protected oil and gas pipeline.
Furthermore, the distance D between two adjacent drainage needles in the integral extension direction of the oil and gas pipeline of the drainage needle meets the requirement that D is more than or equal to 2L and less than or equal to 7.5L.
Furthermore, the drainage network is rectangular and horizontally laid below the side, away from the transmission tower grounding device, of the oil and gas pipeline, the length direction of the drainage network is parallel to the extending direction of the oil and gas pipeline, the vertical minimum distance between the drainage network and the bottom of the oil and gas pipeline is larger than 2m, and the horizontal minimum distance is larger than 4 m.
Further, the length A of the drainage net satisfies
Width B satisfies
Where N is the number of drainage needles connected to the drainage network, ρ is the resistivity (Ω × m) of the soil when dry, and L is the length of the drainage needles.
Furthermore, when the soil resistivity is larger than 300 omega m, the radioactive rays of the drainage network are welded at two top points on one side of the drainage network far away from the oil and gas pipeline, and the direction is vertical to the extending direction of the oil and gas pipeline.
Furthermore, the drainage net is formed by arranging and combining four conductors at equal intervals in the length direction and the width direction.
Furthermore, the sectional area of the copper bar is calculated according to the maximum ground current which may appear in the power grid and the minimum distance between the drainage needle and the power transmission tower grounding grid.
Furthermore, the drainage needle and the drainage net are made of copper-plated steel materials.
Furthermore, each joint adopts an exothermic welding process.
A flow guide copper bar sectional area accounting method for a buried oil and gas pipe network power grid ground-entering over-current prevention complete device is characterized in that four corners of a transmission tower grounding device are provided with grounding device radioactive rays, and a transmission tower grounding device ground-entering current IGroundThe radioactive rays of the grounding device flow out, the end point of the radioactive rays of the grounding device is used as a point current source, and for a single drainage needle, the single drainage needle is considered to be influenced only by the radioactive rays of the two grounding devices pointing to the side of the oil-gas pipeline, and the needle point potential V is obtained according to the ground current; according to the buried depth H of the drainage net and the length L of the copper barCopper barObtaining an approximate value of the grounding resistance R of the whole drainage device; to obtainAnd after the needle point potential V and the resistance R approximate values are obtained, the minimum sectional area S of the copper bar is calculated according to the thermal stability coefficient of the grounding conductor material and the duration of the ground overcurrent.
Further, the calculation formula of the needle point potential V is
Wherein r is the average distance from the needle point to the radial end points of two grounding devices pointing to the side of the oil-gas pipeline, rho is the resistivity when the soil is dry, IGroundAnd grounding current is input into the grounding device of the transmission tower.
Further, the R approximate value of the resistance is calculated by the formula
Wherein A is the drainage net length, B is the drainage net width, LCopper barThe length of the copper bar is, and H is the buried depth of the drainage net.
Further, the sectional area S of the copper bar is calculated according to the formula
Where c is the thermal stability coefficient of the ground conductor material, tjThe minimum sectional area S of the copper bar is calculated according to the formula, and the unit is mm2。
Compared with the prior art, the invention has the following beneficial effects: under the condition that does not influence bury ground oil gas pipeline and transmission tower earthing device, through set up the drainage needle on oil gas pipeline, and be equipped with copper bar and drainage net with the overcurrent drainage, discharge to the more deep soil of keeping away from oil gas pipeline, avoid the overcurrent to cause current potential lifting and direct destruction to oil gas pipeline, the ground overcurrent flow direction is buried underground to the reasonable restriction, and play the effect that reduces near oil gas pipeline soil potential, the condition that buries ground oil gas pipeline destruction that can greatly avoid the ground overcurrent to arouse takes place, on-the-spot practicality and can promote nature are strong.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the oil and gas pipeline and the hoop in accordance with the present invention;
in the figure: 1. the device comprises an oil gas pipeline, 2 transmission tower grounding devices, 3 first copper bars, 4 second copper bars, 5 drainage needles, 6 drainage nets, 7 drainage net radioactive rays, 8 grounding device radioactive rays, 9 hoops and 10 insulating bases.
Detailed Description
Referring to fig. 1-2, a buried oil and gas pipe network anti-power grid in-ground overcurrent complete equipment comprises an oil and gas pipeline 1, a plurality of drainage pins 5 are installed on the surface of the oil and gas pipeline 1 facing one side of a transmission tower grounding device 2 through an insulating base 10, a first copper bar 3 is arranged along the axial direction of the pipeline, the drainage pins 5 form electrical connection through the first copper bar, a drainage net 6 is arranged on the outer side of the oil and gas pipeline 1 far away from the direction of the transmission tower grounding device 2, and the drainage net 6 is connected with the first copper bar 3 through a second copper bar 4. According to the invention, under the condition that the buried oil and gas pipeline 1 and the transmission tower grounding device are not influenced, the drainage needle is arranged on the oil and gas pipeline 1, and the copper bar and the drainage net are matched to drain and discharge the over-current into deeper soil far away from the oil and gas pipeline 1, so that the potential lifting and direct damage of the over-current to the oil and gas pipeline 1 are avoided, the flow of the over-current into the ground is reasonably limited to the buried oil and gas pipeline 1, the effect of reducing the potential of the soil near the oil and gas pipeline 1 is achieved, the condition that the buried oil and gas pipeline 1 is damaged due to the over-current into the ground can be greatly avoided, and the field practicability and the popularization are strong.
One end of the drainage needle 5 is fixed on the side surface of the oil and gas pipeline 1 close to the transmission tower grounding device 2, and the needle point of the other end faces the end, closest to the oil and gas pipeline 1, of the transmission tower grounding device 2.
Wherein, 1 outside cover of oil gas pipeline is equipped with staple bolt 9, and staple bolt 9 adopts glass fiber reinforcement epoxy material to make, and insulator foot 10 integrated into one piece sets up on staple bolt 9.
Wherein the length L (m) of the drainage needle 5 is larger than the radius R of the protected oil and gas pipeline 1.
Wherein, the distance D between two adjacent drainage needles 5 of the drainage needles 5 in the integral extension direction of the oil gas pipeline 1 satisfies 2L and 7.5L.
The drainage network 6 is rectangular and horizontally laid below the side, away from the transmission tower grounding device 2, of the oil and gas pipeline 1, the length direction of the drainage network 6 is parallel to the extending direction of the oil and gas pipeline 1, the vertical minimum distance between the drainage network and the bottom of the oil and gas pipeline 1 is larger than 2m, and the horizontal minimum distance is larger than 4 m.
Wherein the length A of the drainage net 6 satisfies
Width B of
Where N is the number of drainage needles 5 connected to the drainage network 6, ρ is the resistivity (Ω × m) when the soil is dry, and L is the length of the drainage needle.
When the soil resistivity is larger than 300 omega m, the drainage network radioactive rays 7 are additionally welded at two top points on one side of the drainage network 6 far away from the oil and gas pipeline 1, and the direction is vertical to the extending direction of the oil and gas pipeline 1.
The drainage net 6 is formed by arranging and combining four conductors at equal intervals in the length and width directions.
The sectional area of the copper bar is calculated according to the maximum ground current which possibly appears in the power grid and the minimum distance between the drainage pin 5 and the power transmission tower grounding grid.
Wherein, the drainage needle 5 and the drainage net 6 are made of copper-plated steel materials.
Wherein, each joint adopts a heat release welding process.
A flow guide copper bar sectional area accounting method for a buried oil and gas pipe network power grid ground-entering over-current prevention complete device is characterized in that four corners of a transmission tower grounding device 2 are provided with grounding device radioactive rays 8, and a transmission tower grounding device ground-entering current IGroundThe radioactive rays 8 of the grounding device flow out, the end point of the radioactive rays 8 of the grounding device is used as a point current source, and for a single drainage needle 5, the single drainage needle is considered to be only influenced by the ground-in currents of the two radioactive rays 8 of the grounding device pointing to the oil-gas pipeline 1 side, and the needle point potential V is obtained according to the ground-in currents; according to the buried depth H and copper of the drainage net 6Row length LCopper barObtaining an approximate value of the grounding resistance R of the whole drainage device; and after obtaining the needle point potential V and the approximate value of the resistance R, calculating the minimum sectional area S of the copper bar according to the thermal stability coefficient of the grounding conductor material and the duration of the earth overcurrent.
Wherein the calculation formula of the needle point potential V is as follows
Wherein r is the average distance from the needle point to the end points of the radioactive rays 8 of the two grounding devices at the side pointing to the oil and gas pipeline 1, rho is the resistivity when the soil is dry, IGroundAnd the grounding current is the grounding current of the grounding device of the transmission tower.
Wherein, the resistance R approximate value calculation formula is
Wherein A is the drainage net length, B is the drainage net width, LCopper barThe length of the copper bar is, and H is the buried depth of the drainage net.
Wherein the sectional area S of the copper bar is calculated by the formula
Where c is the thermal stability coefficient of the ground conductor material, tjThe minimum sectional area S of the copper bar is calculated according to the formula, and the unit is mm2。
For not taking ground production and living space, the oil gas pipeline 1 that carries oil gas mostly buries in the underground, and the degree of depth is in 0.5m ~1m within range, and constructor often adds the anticorrosive coating in 1 surface of the oil gas pipeline of metal in order to prevent that oil gas pipeline 1 from burying for a long time in the underground and being destroyed by the acid-base material corruption in soil, and because the anticorrosive coating generally is insulating material, can also play certain protection invasion voltage ripples's effect. In one embodiment, a section of gas and oil pipeline 1 is laid parallel to a 500kV transmission line of the power grid and the minimum horizontal distance between the gas and oil pipeline 1 and the transmission tower grounding device 2 is only about 6.5 m. This section oil gas pipeline 1 is just less than a year after putting into operation, and the operation maintainer detects that obvious by erosion and damage phenomenon appear in 1 surperficial anticorrosive coating of discovery oil gas pipeline than other sections oil gas pipeline 1, seriously influences the safety and stability operation of oil gas pipeline 1. The investigation and analysis determine that the overlarge ground current caused by lightning strike or ground fault of the transmission line is the main reason for the erosion of the anticorrosive coating of the oil and gas pipeline 1. In order to prevent the overcurrent of the power grid in the ground, after the anticorrosive coating is repaired, the device for preventing the overcurrent of the power grid in the ground of the buried oil and gas pipe network based on the needle-network structure is arranged on the section of the gas and oil gas pipeline 1. In order to better verify the actual protection effect of the device applied to the engineering, only a part of the oil-gas pipeline 1 with the length of 100m is provided with a protection device.
The pipe diameter of the oil and gas pipeline 1 at the section is 1219mm, the extending direction is nearly parallel to the transmission line, the burial depth is about 0.7m, and the burial depth of the transmission tower grounding device 2 is about 0.5 m. Firstly, arranging drainage needles 5 on an oil and gas pipeline 1 at equal intervals by matching a hoop 9 made of a glass fiber reinforced epoxy resin material with an insulating base 10 which is integrally formed on the hoop 9, wherein as shown in fig. 2, the distance between the joint of the drainage needle 5 and the insulating base 10 and the surface of the oil and gas pipeline 1 is 0.25 m; the diameter of the drainage needle 5 is 8mm, the length of the main body is 0.75m, the length of the needle point is 0.2m, the thickness of the copper plating on the surface is 200 mu m, the distance between the drainage needles 5 is 4m, and 24 drainage needles 5 are arranged in total. Then, a drainage network 6 is horizontally laid on one side, away from the power transmission line, of the oil and gas pipeline 1 (the length direction of the drainage network 6 is parallel to the extending direction of the oil and gas pipeline 1), the length of the drainage network 6 is 4.5m, the width of the drainage network is 2.5m, the burial depth of the drainage network is 4m, and the minimum horizontal distance between the drainage network and the oil and gas pipeline 1 is 4.5 m. All the drainage needles 5 are electrically connected through the first copper bars 3, then the first copper bars 3 are connected with the drainage net 6 through the second copper bars 4, the specification of the copper bars is selected to be 15mm by 3mm, and the joints adopt an exothermic welding process. After 3 months, the oil and gas pipeline 1 at the section is detected, and the surface anticorrosive coating of the part of the oil and gas pipeline 1 provided with the protection device is more complete than the unprotected part and has no obvious damage, so that the needle-net structured buried oil and gas pipeline network power grid in-ground overcurrent prevention device provided by the invention has obvious beneficial effects.
In another embodiment, because the resistivity of the soil where the oil and gas pipeline 1 is located is higher and the maximum ground current of the power grid is larger, in order to ensure the protection effect, the number of the drainage grids 6 connected in parallel is increased, the specification of the drainage copper bars is increased to 10mm by 6mm, and drainage grid radioactive rays 7 are welded at two top points of one side of the drainage grids 6 far away from the oil and gas pipeline 1, and the direction is perpendicular to the extending direction of the oil and gas pipeline 1, as shown in fig. 1.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. The utility model provides a buried oil gas pipe network prevents electric wire netting over current integrated equipment that ingresses ground, characterized by: the device comprises an oil gas pipeline, wherein a plurality of drainage needles are arranged on the surface of the oil gas pipeline on one side, facing a transmission tower grounding device, of the oil gas pipeline through an insulating base, first copper bars are arranged along the axial direction of the pipeline, the drainage needles are electrically connected through the first copper bars, a drainage net is arranged on the outer side, far away from the transmission tower grounding device, of the oil gas pipeline, and the drainage net is connected with the first copper bars through second copper bars; the staple bolt is overlapped in the oil gas pipeline outside, and the staple bolt adopts glass fiber reinforcement epoxy material to make, and insulator foot integrated into one piece sets up on the staple bolt, and current drainage needle one end is fixed at the oil gas pipeline side surface that is close to transmission tower earthing device, and the needle point of the other end is terminal towards transmission tower earthing device and the nearest perpendicular ray of oil gas pipeline.
2. The buried oil and gas pipe network power grid in-ground over-current prevention complete device of claim 1, which is characterized in that: the length L of the drainage needle is larger than the radius R of the protected oil and gas pipeline, and the distance D between two adjacent drainage needles in the integral extension direction of the oil and gas pipeline satisfies that D is larger than or equal to 2L and smaller than or equal to 7.5L.
3. The buried oil and gas pipe network power grid ground overcurrent prevention complete device of claim 1 is characterized in that: the drainage network is rectangular and horizontally laid below the side, away from the transmission tower grounding device, of the oil and gas pipeline, the length direction of the drainage network is parallel to the extending direction of the oil and gas pipeline, the vertical minimum distance between the drainage network and the bottom of the oil and gas pipeline is larger than 2m, and the horizontal minimum distance is larger than 4 m.
4. The buried oil and gas pipe network power grid in-ground over-current prevention complete device of claim 1, which is characterized in that: the drainage net is formed by arranging and combining four conductors at equal intervals in the length and width directions, and the length A of the drainage net meets the requirement
Width B of
And N is the number of drainage needles connected to the drainage network, rho is the resistivity of the soil when the soil is dry, and L is the length of the drainage needles.
5. The buried oil and gas pipe network power grid in-ground over-current prevention complete device of claim 1, which is characterized in that: and when the soil resistivity is more than 300 omega m, welding radioactive rays of the drainage network at two top points on one side of the drainage network far away from the oil and gas pipeline, wherein the direction is vertical to the extending direction of the oil and gas pipeline.
6. A flow guide copper bar sectional area accounting method of a buried oil and gas pipe network power grid in-ground overcurrent prevention complete device adopts the buried oil and gas pipe network power grid in-ground overcurrent prevention complete device of claim 1, and is characterized in that: the four corners of the grounding device of the transmission tower are provided with the radioactive rays of the grounding device, and the grounding device of the transmission tower is provided with a grounding current IGroundThe radioactive rays of the grounding device flow out, the radioactive wire end point of the grounding device is used as an end current source, and then for a single drainage needle, a single row is consideredThe current needle is only influenced by the radioactive ray earth-entering current of the two grounding devices pointing to the side of the oil-gas pipeline, and the needle point potential V is obtained according to the earth-entering current; according to the buried depth H of the drainage net and the length L of the copper barCopper barObtaining an approximate value of the grounding resistance R of the whole drainage device; and after obtaining the needle point potential V and the approximate value of the resistance R, calculating the minimum sectional area S of the copper bar according to the thermal stability coefficient of the grounding conductor material and the duration of the earth overcurrent.
7. The method for checking the cross section of the flow guide copper bar of the complete device for preventing the power grid from entering the ground from overcurrent according to claim 6, wherein the method comprises the following steps: the calculation formula of the needle point potential V is
Wherein r is the average distance from the needle point to the radial end points of two grounding devices pointing to the side of the oil-gas pipeline, rho is the resistivity when the soil is dry, IGroundAnd the grounding current is the grounding current of the grounding device of the transmission tower.
8. The method for checking the cross section of the flow guide copper bar of the complete device for preventing the power grid from entering the ground from overcurrent according to claim 7, wherein the method comprises the following steps: the resistance R approximate value calculation formula is
Wherein A is the drainage net length, B is the drainage net width, LCopper barThe length of the copper bar is, and H is the buried depth of the drainage net.
9. The method for checking the cross section of the flow guide copper bar of the complete device for preventing the power grid from entering the ground from overcurrent according to claim 8, wherein the method comprises the following steps: the sectional area S of the copper bar is calculated by the formula
Where c is the thermal stability coefficient of the grounded conductor material, tjFor duration of the over-current, V is the potential of the needle tip, and R is the ground resistance of the whole drainage deviceThe approximate value is the minimum sectional area S of the copper bar calculated according to the formula, and the unit of the sectional area S of the copper bar is mm2。
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