CN114150320B - Grounding method and system for female protection coupler of electric instrument of apron valve well - Google Patents
Grounding method and system for female protection coupler of electric instrument of apron valve well Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 19
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 89
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- 239000004567 concrete Substances 0.000 claims description 4
- 238000009413 insulation Methods 0.000 abstract description 13
- 238000013461 design Methods 0.000 description 13
- 238000012360 testing method Methods 0.000 description 11
- 238000001514 detection method Methods 0.000 description 8
- 238000010892 electric spark Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 5
- 239000007788 liquid Substances 0.000 description 5
- 238000005536 corrosion prevention Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
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- 239000011150 reinforced concrete Substances 0.000 description 2
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- 238000003466 welding Methods 0.000 description 2
- 229910001335 Galvanized steel Inorganic materials 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 208000025274 Lightning injury Diseases 0.000 description 1
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
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- 230000005540 biological transmission Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000008397 galvanized steel Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
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Classifications
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F13/00—Inhibiting corrosion of metals by anodic or cathodic protection
- C23F13/02—Inhibiting corrosion of metals by anodic or cathodic protection cathodic; Selection of conditions, parameters or procedures for cathodic protection, e.g. of electrical conditions
- C23F13/06—Constructional parts, or assemblies of cathodic-protection apparatus
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F13/00—Inhibiting corrosion of metals by anodic or cathodic protection
- C23F13/02—Inhibiting corrosion of metals by anodic or cathodic protection cathodic; Selection of conditions, parameters or procedures for cathodic protection, e.g. of electrical conditions
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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
- H01R4/64—Connections between or with conductive parts having primarily a non-electric function, e.g. frame, casing, rail
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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
Abstract
The invention discloses a grounding method of a female protection coupler of an electric instrument of an apron valve well, which comprises the following steps: equipotential connection is carried out on the steel bars and the outer lining steel plates of the valve well and the valve well grounding electrode, and the valve well grounding electrode is connected with the apron grounding system; installing an insulating joint on the cable steel pipe; a grounded flat steel belt is arranged in the valve well and is supported by a bus insulator; the grounding flat steel belt is respectively connected with the explosion-proof solid decoupler and the grounding wire of the electric instrument equipment, and the other end of the grounding flat steel belt is connected with the grounding electrode of the valve well; and enabling the explosion-proof solid decoupler to operate in an isolated mode when the potential of the oil supply pipeline is smaller than the absolute value of the threshold potential, and to operate in a short circuit mode when the potential of the oil supply pipeline is larger than the absolute value of the threshold potential. The invention limits the potential of the oil supply pipeline between threshold potentials, thereby eliminating the interference of strong energy such as direct lightning current, induced lightning current, alternating current fault current and the like, effectively meeting the explosion-proof grounding requirement of electric instrument equipment, and ensuring the effective and stable electricity-saving operation of the pipeline insulation and negative protection system.
Description
Technical Field
The invention belongs to the technical field of oil and gas pipeline protection, and particularly relates to a grounding method and a grounding system for an electric instrument female protection coupler of an apron valve well.
Background
With the development of new construction, reconstruction and extension technologies of airports in China, airport oil supply engineering is an indispensable sub-engineering for airport construction and development, and is a key factor for ensuring normal operation of airports. At present, an electric valve operating system is adopted for an air oil supply pipeline of an apron, explosion-proof electric instrument equipment such as an electric valve, a pressure transmitter and a liquid level switch are arranged in an air apron valve well, wherein an electric fault grounding, explosion-proof grounding and lightning protection grounding are needed to be carried out on cable grounding core wires of an outer shell of the explosion-proof electric instrument equipment such as the electric valve, the pressure transmitter and the liquid level switch and a power supply, otherwise, an electric fault can occur when the electric fault does not ground, insulation damage occurs, a shell collision fault can electrically injure a person, an electric element of an electric transmission mechanism can be damaged when the electric valve outer shell does not make lightning protection grounding, and oil vapor explosion can be caused when the explosion-proof electric fault does not ground.
However, the valve well adopts a reinforced concrete structure, the outermost layer of the valve well is formed by welding a 10mm steel plate, 4-6 DN50 cable steel pipes are welded with the steel plate in a sealing manner, and three rust-proof layers with six oil layers are arranged outside the steel plate and are insulated from the ground. Because the valve well concrete structure and the outer lining steel plate structure are subjected to corrosion prevention and insulation treatment, the valve well is in a state of being insulated from the ground, the grounding electrode is not more than 1 omega of the valve well steel plate outer lining steel bar structure, in addition, a power cable of an electric valve and an instrument is led to a mounting equipment box for mounting an apron ground to penetrate through a DN50 galvanized steel pipe, and the cable steel pipe is connected with a grounding system of the equipment box and a grounding system such as an apron street lamp and the like in an equipotential manner.
In addition, the constant potential meter operation output condition is shown in the first table in the case that the electric meter device is not grounded at all, and the constant potential output overload non-operation condition is shown in the second table in the case that the electric meter device is directly grounded without any measure. Because electric instrument equipment such as an electric valve, a pressure transmitter and the like is arranged on an oil supply pipeline, the oil supply pipeline is insulated from the ground to form an insulation system, the electric spark detection withstand voltage of a corrosion-resistant layer of the pipeline 3PE is 15KV, once the electric spark detection withstand voltage is connected with the ground, the electric spark detection withstand voltage is equivalent to the electric spark detection withstand voltage of the oil supply pipeline, the electric spark detection withstand voltage is equivalent to the electric spark detection withstand voltage of the pipeline is connected with the ground, the protection potential of the pipeline is subjected to multiple ground faults to cause protection current leakage, so that the load of a potentiostat is increased, the protection potential of the pipeline is interfered by strong electromagnetic waves such as the ground and nearby subways, the electric spark detection withstand voltage of the electric spark detection withstand voltage cannot normally operate, even power cannot be transmitted at all, accelerated corrosion of the oil line is caused, and the protection potential is flat and hydrogen embrittlement damage of the steel pipeline is caused.
Meter-constant potential working mode output parameter (under the condition that the pipeline electric valve instrument is not connected with any grounding wire)
Meter two constant potential working mode output parameter (under the condition of earthing connection of pipeline mounted electric valve, pressure transmitter and liquid level switch)
It can be seen that when the electric instrument devices such as the electric valve and the pressure transmitter are installed on the oil supply pipeline, the electric instrument devices must be grounded, and the oil supply pipeline must be operated in an insulating manner, so that a contradiction exists between the electric instrument devices and the oil supply pipeline. In order to solve this problem, the prior art mainly proposes the following solutions:
1. The flanges at the two ends of the electric valve are installed as insulating flanges, but the method has the problems that the diameter of the valve connecting bolt is required to be reduced because the connecting bolt is required to be provided with an insulating sleeve, so that the connecting strength of the high-strength bolt is greatly reduced, the bolt is not accepted as a result of being broken, and in addition, the insulating effect of the insulating flanges is poor because the electric valve in a well is in a humid environment for a long time.
2. The conventional drainage device is adopted, a plurality of diodes which are connected with each other are utilized to form the drainage device and are grounded, the potential of the pipeline is limited to the conduction potential at the two ends of the diodes, but the method cannot withstand high-energy current and high-energy lightning current, so that the negative protection system and the pipeline are damaged.
Therefore, the existing solution cannot effectively solve the problem that the oil supply pipeline is ensured to stably and insulatively run while the electric instrument equipment is grounded.
Disclosure of Invention
The invention aims to provide a grounding method and a grounding system for a female protection coupler of an electric instrument of an apron valve well, which are used for solving at least one technical problem in the prior art.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
In a first aspect, the invention provides a grounding method for a female protection coupler of an electric instrument of an apron valve well, comprising the following steps:
Equipotential connection is carried out on the steel bars and the outer lining steel plates of the valve well and the valve well grounding electrode, and the valve well grounding electrode is connected with the apron grounding system through a cable steel pipe, wherein the resistance of the valve well grounding electrode is less than or equal to 1 omega;
installing an insulating joint on a cable steel pipe of electrical instrument equipment to isolate the cable steel pipe from the apron grounding system, wherein the electrical instrument equipment is installed on an oil supply pipeline;
A grounding flat steel belt is arranged in the valve well, and is supported by a bus insulator to be insulated from the valve well concrete;
Connecting the grounding flat steel belt with one end of an explosion-proof solid-state decoupling device and a grounding wire of the electric instrument equipment respectively, and connecting the other end of the explosion-proof solid-state decoupling device with the valve well grounding electrode;
And enabling the explosion-proof solid decoupler to operate in an isolated mode when the potential of the oil supply pipeline is smaller than the threshold potential absolute value, and performing short-circuit grounding drainage operation when the potential of the oil supply pipeline is larger than the threshold potential absolute value.
In one possible design, the electrical meter device includes an electrically operated valve, a pressure transmitter, and/or a level switch.
In one possible design, the method further comprises:
connecting a power cable inlet wire of the electric valve into an equipment box on the ground of the apron, wherein a wiring terminal of the equipment box is connected with a grounding system of the apron in an equipotential manner;
A solid state decoupler core is mounted within the device housing.
In one possible design, the threshold potential is 2v.
In one possible design, the oil supply line is provided with a negative potential keeping potential meter system, which enables the potential of the oil supply line to run at-0.85 to-1.2V.
In one possible design, the explosion-proof solid state decoupler is model BX SSD/EX-L100.
In a second aspect, the present invention provides a ground system for a female protection coupler of an electrical instrument of a apron valve shaft, comprising:
the valve well, the steel bar and the outer lining steel plate of the valve well are connected with the valve well grounding electrode in an equipotential manner, and the valve well grounding electrode is connected with the apron grounding system through a cable steel pipe, wherein the resistance of the valve well grounding electrode is less than or equal to 1 omega;
the cable steel pipe of the electric instrument equipment is provided with an insulating joint, wherein the electric instrument equipment is arranged on an oil supply pipeline;
The grounding flat steel belt is arranged in the valve well and is supported by a bus insulator, and the grounding flat steel belt is connected with a grounding wire of electrical instrument equipment;
the valve well grounding electrode is connected with the valve well grounding electrode through the valve well grounding electrode;
The anti-explosion solid-state decoupling device is provided with a threshold potential, the anti-explosion solid-state decoupling device operates in an isolated mode when the potential of the oil supply pipeline is smaller than the absolute value of the threshold potential, and the anti-explosion solid-state decoupling device operates in a short circuit mode when the potential of the oil supply pipeline is larger than the absolute value of the threshold potential.
In one possible design, the system further comprises:
a solid state decoupler core mounted in an equipment box on the apron floor.
In one possible design, the insulation joint is a high voltage explosion proof insulation joint, which is screwed to the cable steel pipe.
In one possible design, the explosion-proof solid state decoupler is model BX SSD/EX-L100.
The beneficial effects are that:
The valve well grounding electrode is connected with the apron grounding system through a cable steel pipe; then installing an insulating joint on the cable steel pipe of the electric instrument equipment to isolate the cable steel pipe from the apron grounding system, wherein the electric instrument equipment is installed on the oil supply pipeline; then installing a grounding flat steel belt in the valve well, and supporting the grounding flat steel belt to be insulated with the valve well by a bus insulator; then, connecting the grounding flat steel belt with one end of the explosion-proof solid-state decoupling device and the grounding wire of the electric instrument equipment respectively, and connecting the other end of the explosion-proof solid-state decoupling device with the grounding electrode of the valve well; the grounding resistance meter for the valve well test is obtained through an explosion-proof solid state decoupling device test; the explosion-proof solid decoupler is enabled to operate in an isolated mode when the potential of the oil supply pipeline is smaller than the absolute value of the threshold potential, and is enabled to operate in a short-circuit grounding drainage mode when the potential of the oil supply pipeline is larger than the absolute value of the threshold potential, so that the potential of the oil supply pipeline is limited between the threshold potentials (for example, between-2V and +2V), interference of strong energy such as direct lightning current, induced lightning current and alternating current fault current is eliminated, meanwhile, the explosion-proof grounding requirement of electric instrument equipment is effectively met, and the effective stable electricity-saving operation of the pipeline insulation and negative protection system can be guaranteed. In addition, by installing the solid decoupling cores in the equipment boxes, preferably, the solid decoupling cores are installed in the equipment boxes of all electric valve grounding wires, so that the influence of the connection of the grounding terminals of the equipment boxes and the apron grounding system on the electric valve and the protection potential of the pipeline can be eliminated, the oil supply pipeline of the aviation oil is ensured not to be influenced by subway stray current and grounding leakage current, the corrosion prevention and protection effect of the pipeline are ensured not to be influenced by electromagnetic interference, the cathode protection system can effectively and energy-effectively operate, and the potential of the oil supply pipeline can stably operate between-0.85V and-1.2V.
Drawings
FIG. 1 is a flow chart of a method for grounding an electrical instrument female coupler of an apron valve well in this embodiment;
FIG. 2 is a schematic diagram of an explosion-proof solid state decoupler grounding system in the present embodiment;
FIG. 3 is a schematic structural view of a solid state decoupling core in the present embodiment;
fig. 4 is a schematic diagram showing connection between an insulated joint and a cable steel pipe in this embodiment.
Wherein, 1-explosion-proof solid state decoupler; 2-valve well grounding electrode; 3-a apron grounding system; 4-grounding flat steel strips; 5-busbar insulator; 6-a solid state decoupler core; 7-insulating joints.
Detailed Description
For the purposes of making the objects, technical solutions and advantages of the embodiments of the present specification more clear, the technical solutions of the embodiments of the present specification will be clearly and completely described below with reference to the drawings in the embodiments of the present specification, and it is apparent that the described embodiments are some embodiments of the present specification, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are intended to be within the scope of the present invention based on the embodiments herein.
Examples
As shown in fig. 1-4, in a first aspect, the present embodiment provides a grounding method for a female protection coupler of an electrical instrument of an apron valve well, which includes, but is not limited to, implementation in steps S101-S105:
s101, connecting a reinforcing steel bar and an outer lining steel plate of a valve well with a valve well grounding electrode 2 in an equipotential manner, and connecting the valve well grounding electrode 2 with an apron grounding system 3 through a cable steel pipe, wherein the resistance of the valve well grounding electrode 2 is less than or equal to 1 omega;
The valve well is usually in a reinforced concrete structure, the outermost layer of the valve well is formed by welding a10 mm steel plate, 4-6 DN50 cable steel pipes of electric instrument equipment are welded with the steel plate in a sealing mode, and three-cloth six-oil rust-proof layers are arranged outside the steel plate and are insulated from the ground, so that the steel bars and the outer lining steel plates of the valve well are required to be grounded, namely the steel bars and the outer lining steel plates of the valve well are connected with the valve well grounding electrode 2 in an equipotential mode.
The grounding resistance value of the valve well is obtained by testing the grounding resistance value through one end of the explosion-proof solid-state decoupling device 1 described below and the other inlet end, and the measurement result is that the grounding resistance value is less than or equal to 1 omega, so that the standard design requirement is met.
As a practical application, after the valve well is equipped with the solid-state coupler, the measured ground resistance is as follows:
s102, installing an insulating joint 7 on a cable steel pipe of electrical instrument equipment to isolate the cable steel pipe from the apron grounding system 3, wherein the electrical instrument equipment is installed on an oil supply pipeline;
It should be noted that, preferably, the electrical instrument device includes, but is not limited to, an electric valve, a pressure transmitter and a liquid level switch, the cable steel pipe is a DN50 cable steel pipe, the insulating joint 7 is a high-voltage explosion-proof insulating joint 7, and the cable steel pipe is in threaded connection with the insulating joint 7 so as to isolate the cable steel pipe from the apron grounding system 3.
S103, installing a grounding flat steel belt 4 in the valve well, and supporting the grounding flat steel belt 5 through a bus insulator 5 to enable the grounding flat steel belt to be insulated from the valve well concrete;
Step S104, connecting the grounding flat steel belt 4 with one end of the explosion-proof solid-state decoupling device 1 and a grounding wire of the electric instrument equipment respectively, and connecting the other end of the explosion-proof solid-state decoupling device 1 with the valve well grounding electrode 2;
It should be noted that, preferably, the type of the explosion-proof solid state decoupler 1 is BX SSD/EX-L100; specifically, one end of the grounding flat steel belt 4 is connected with the grounding wires of alternating fault current and lightning current of instrument equipment such as an electric valve, a pressure transmitter, a liquid level switch and the like.
And S105, enabling the explosion-proof solid decoupler 1 to operate in an isolated mode when the potential of the oil supply pipeline is smaller than the absolute value of the threshold potential, and enabling the short circuit to be grounded and drain to operate when the potential of the oil supply pipeline is larger than the absolute value of the threshold potential.
Wherein, it should be noted that, the threshold potential is preferably-2V/+2v, the operation parameter of the explosion solid state decoupler is preferably-2V/+2v, the steady state current 50A, the lightning current passes through the capacity: 100KA 20/80 s. Specifically, the anti-explosion solid-state decoupler 1 operates in an isolation mode when the potential of the oil supply pipeline is less than l+/-2 lV and immediately switches the short-circuit mode to operate when the potential of the oil supply pipeline is greater than l+/-2 lV, and the operation mode can be performed for numerous times, so that the potential of the oil supply pipeline is limited between-2V and +2V, and further, the interference of strong energy such as direct lightning current, induced lightning current, alternating current fault current and the like is eliminated, the anti-explosion grounding requirement of electric instrument equipment is effectively met, and the effective stable electricity-saving operation of the pipeline insulation and negative protection system can be ensured.
In one possible design, the method further comprises:
S106, connecting a power cable inlet wire of the electric valve into an equipment box on the ground of the apron, wherein a wiring terminal of the equipment box is connected with the grounding system 3 of the apron in an equipotential manner; a solid state decoupler core 6 is mounted within the equipment cabinet.
It should be noted that, preferably, the power cable of the electric valve is a quad cable, preferably, the oil supply pipeline is provided with a female protection potential rectifier system, and the female protection potential rectifier system makes the potential of the oil supply pipeline run at-0.85 to-1.2V, and because the connection terminal of the equipment box and the apron grounding system 3 have a certain influence on the electric valve and the protection potential of the pipeline when being connected in an equipotential manner, the solid decoupling core 6 is installed in the equipment box, preferably, the model of the solid decoupling core 6 is JR-SSD +/-2V50/100A, and the threshold potential is-2V/+2V, thereby avoiding the influence on the pipeline protection system caused by the grounding leakage current and subway stray current interference caused by the grounding core of the electric valve power cable.
Based on the disclosure, in the embodiment, the steel bars and the outer lining steel plates of the valve well are connected with the valve well grounding electrode 2 in an equipotential manner, and the valve well grounding electrode 2 is connected with the apron grounding system 3 through a cable steel pipe; then installing an insulating joint 7 on the cable steel pipe of the electric instrument equipment to isolate the cable steel pipe from the apron grounding system 3, wherein the electric instrument equipment is installed on the oil supply pipeline; then, installing a grounding flat steel belt 4 in the valve well, and supporting the grounding flat steel belt 4 through a bus insulator 5; then, connecting the grounding flat steel belt 4 with one end of the explosion-proof solid-state decoupling device 1 and the grounding wire of the electric instrument equipment respectively, and connecting the other end of the explosion-proof solid-state decoupling device 1 with the valve well grounding electrode 2; the grounding resistance meter for the valve well test is obtained by testing the explosion-proof solid-state decoupling device 1; the explosion-proof solid decoupler 1 is enabled to operate in an isolated mode when the potential of the oil supply pipeline is smaller than the absolute value of the threshold potential, and is enabled to operate in a short circuit mode when the potential of the oil supply pipeline is larger than the absolute value of the threshold potential, so that the potential of the oil supply pipeline is limited between the threshold potentials (for example, between-2V and +2V), interference of strong energy such as direct lightning current, induced lightning current and alternating current fault current is eliminated, explosion-proof grounding requirements of electrical instrument equipment are effectively met, and effective stable electricity-saving operation of a pipeline insulation and negative protection system can be guaranteed. In addition, by installing the solid decoupling cores 6 in the equipment boxes, preferably installing the solid decoupling cores 6 in all the equipment boxes, the influence of the connection of the grounding terminals of the equipment boxes and the apron grounding system 3 on the electric valve and the protection potential of the pipeline can be eliminated, the oil supply pipeline of the aviation oil is ensured not to be influenced by subway stray current and grounding leakage current, the corrosion prevention and protection effect of the pipeline are ensured not to be influenced by electromagnetic interference, the cathode protection system can effectively operate in an energy-saving mode, and the potential of the oil supply pipeline can stably operate between-0.85V and-1.2V.
As an actual application of the embodiment, the embodiment can obtain the actual application effect of the embodiment by testing the protection potential of the output parameter of the negative potential keeping instrument, which is specifically as follows:
Output parameters of three constant potential working modes
Meter four constant potential working mode mining and test pile protection potential test
Output parameters of five constant current working modes
Six-constant-current working mode sampling and test pile protection potential test
Seven-constant potential working mode valve in-well electric valve potential measurement
Electric valve potential measurement in valve well with eight constant current working modes
As shown in tables three to eight, when the method of the example is adopted to perform explosion-proof grounding, alternating-current fault grounding and lightning current grounding, and the oil supply pipeline is ensured to perform stable insulation operation, the grounding wires of the electric valve in the valve well and the pressure transmitter shell are directly connected with the ground flat steel strip 4 arranged in the well through the insulator to be equipotential with the oil supply pipeline, the ground flat steel strip 4 in the well is connected with the valve well grounding electrode 2 through an explosion-proof solid coupler, the grounding resistance is measured to be less than or equal to 1 omega through the solid decoupler, and when alternating-current fault current and/or lightning current occurs, the operation is switched to a short-circuit state, so that the alternating-current fault protection and lightning stroke protection are effectively realized. The grounding wire of the four-core power cable of the electric valve in the valve well is connected to the equipment box, so that a certain influence on the protection potential of the oil supply pipeline exists, and the problem is solved by installing the BX SSD/EX-L100 KA 20/80ns solid-state decoupler core 6.
Test results: because the electric valve body in the FJ-09 valve well and the electric potential of the oil supply pipeline do not meet the requirements, the electric valve body in the FJ-09 valve well and the electric potential of the pipeline are reduced by 1.5A by reducing the output current of a potentiostat by 0.27 omega through installing a solid decoupling device grounding resistor in an equipment box installed on the ground of an apron, and the electric potential of the electric valve body in the FJ-09 valve well and the electric potential of the pipeline are reduced by-0.23V to reach-0.93V so as to meet the requirements of protection potential, the cathode protection potential operates more stably, the output voltage and the output current are reduced to save electric energy and meet the requirements, and therefore, the electric valve power ground wire in the ground equipment box is grounded through the solid decoupling device to realize the required operation effect.
In a second aspect, the present invention provides a ground system for a female protection coupler of an electrical instrument of a apron valve shaft, comprising:
The valve well, the steel bar and the outer lining steel plate of the valve well are connected with the valve well grounding electrode 2 in an equipotential manner, the valve well grounding electrode 2 is connected with the apron grounding system 3 through a cable steel pipe, and the resistance of the valve well grounding electrode 2 is less than or equal to 1 omega;
An electric instrument device, wherein an insulating joint 7 is arranged on a cable steel pipe of the electric instrument device, and the electric instrument device is arranged on an oil supply pipeline;
The grounding flat steel belt 4 is arranged in the valve well and supported by the bus insulator 5, and the grounding flat steel belt 4 is connected with the grounding wire of the electric instrument equipment;
an explosion-proof solid-state decoupling device 1, wherein one end of the explosion-proof solid-state decoupling device 1 is connected with the grounding flat steel belt 4, and the other end of the explosion-proof solid-state decoupling device 1 is connected with the valve well grounding electrode 2;
the anti-explosion solid-state decoupling device 1 is provided with a threshold potential, the anti-explosion solid-state decoupling device 1 operates in an isolated mode when the potential of the oil supply pipeline is smaller than the absolute value of the threshold potential, and the anti-explosion solid-state decoupling device 1 operates in a short circuit mode when the potential of the oil supply pipeline is larger than the absolute value of the threshold potential.
In one possible design, the system further comprises:
a solid state decoupler core 6, said solid state decoupler core 6 being mounted in the equipment box of the apron floor.
In one possible design, the insulation joint 7 is a high voltage explosion-proof insulation joint 7, and the high voltage explosion-proof insulation joint 7 is in threaded connection with the cable steel pipe.
In one possible design, the explosion-proof solid state decoupler 1 is of the type BX SSD/EX-L100.
Finally, it should be noted that: the foregoing description is only of the preferred embodiments of the invention and is not intended to limit the scope of the invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The method for grounding the female protection coupler of the electric instrument of the apron valve well is characterized by comprising the following steps of:
Equipotential connection is carried out on the steel bars and the outer lining steel plates of the valve well and the valve well grounding electrode, and the valve well grounding electrode is connected with the apron grounding system through a cable steel pipe, wherein the resistance of the valve well grounding electrode is less than or equal to 1 omega;
installing an insulating joint on a cable steel pipe of electrical instrument equipment to isolate the cable steel pipe from the apron grounding system, wherein the electrical instrument equipment is installed on an oil supply pipeline;
A grounding flat steel belt is arranged in the valve well, and is supported by a bus insulator to be insulated from the valve well concrete;
Connecting the grounding flat steel belt with one end of an explosion-proof solid-state decoupling device and a grounding wire of the electric instrument equipment respectively, and connecting the other end of the explosion-proof solid-state decoupling device with the valve well grounding electrode;
And enabling the explosion-proof solid decoupler to operate in an isolated mode when the potential of the oil supply pipeline is smaller than the threshold potential absolute value, and to operate in a short-circuit grounding drainage mode when the potential of the oil supply pipeline is larger than the threshold potential absolute value.
2. The method of claim 1, wherein the electrical meter device comprises an electrically operated valve, a pressure transmitter, and/or a level switch.
3. The method of grounding an apron valve electrical instrument female coupler of claim 2, further comprising:
connecting a power cable inlet wire of the electric valve into an equipment box on the ground of the apron, wherein a wiring terminal of the equipment box is connected with the grounding system of the apron in an equipotential manner;
A solid state decoupler core is mounted within the device housing.
4. The method of grounding an electrical instrument female coupler of an apron valve shaft of claim 1, wherein the threshold potential is 2V.
5. The method for grounding an electrical instrument female protection coupler of an apron valve well according to claim 1, wherein the oil supply pipeline is provided with a female protection potentiostat system, and the female protection potentiostat system enables the potential of the oil supply pipeline to run at-0.85 to-1.2V.
6. The method for grounding an apron valve electric instrument female protection coupler of claim 1, wherein the explosion-proof solid state decoupler is of the type BX SSD/EX-L100.
7. An apron valve well electrical instrument female protection coupler grounding system, comprising:
the valve well, the steel bar and the outer lining steel plate of the valve well are connected with the valve well grounding electrode in an equipotential manner, and the valve well grounding electrode is connected with the apron grounding system, wherein the resistance of the valve well grounding electrode is less than or equal to 1 omega;
the cable steel pipe of the electric instrument equipment is provided with an insulating joint, wherein the electric instrument equipment is arranged on an oil supply pipeline;
The grounding flat steel belt is arranged in the valve well and is supported by a bus insulator, and the grounding flat steel belt is connected with a grounding wire of electrical instrument equipment;
the valve well grounding electrode is connected with the valve well grounding electrode through the valve well grounding electrode;
The anti-explosion solid-state decoupling device is provided with a threshold potential, the anti-explosion solid-state decoupling device operates in an isolated mode when the potential of the oil supply pipeline is smaller than the absolute value of the threshold potential, and the anti-explosion solid-state decoupling device operates in a short circuit mode when the potential of the oil supply pipeline is larger than the absolute value of the threshold potential.
8. The apron valve shaft electrical instrument female coupler grounding system of claim 7, further comprising:
a solid state decoupler core mounted in an equipment box on the apron floor.
9. The apron valve shaft electrical instrument female protection coupler grounding system of claim 7, wherein the insulated joint is a high voltage explosion proof insulated joint, the high voltage explosion proof insulated joint being threadably connected to the cable steel pipe.
10. The apron valve shaft electrical instrument female coupler grounding system of claim 7, wherein the explosion-proof solid state decoupler is of the type BX SSD/EX-L100.
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| CN202111467913.0A CN114150320B (en) | 2021-12-03 | 2021-12-03 | Grounding method and system for female protection coupler of electric instrument of apron valve well |
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| CN202111467913.0A CN114150320B (en) | 2021-12-03 | 2021-12-03 | Grounding method and system for female protection coupler of electric instrument of apron valve well |
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Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001313101A (en) * | 2000-04-27 | 2001-11-09 | Sankosha Corp | Grounding system |
| JP2010001549A (en) * | 2008-06-23 | 2010-01-07 | Tokyo Gas Co Ltd | Cathodic corrosion protection system and cathodic corrosion protection method for underground pipeline |
| JP2012193414A (en) * | 2011-03-16 | 2012-10-11 | Tokyo Gas Co Ltd | Cathodic protection method and cathodic protection system of buried metal pipeline |
| CN202954094U (en) * | 2012-12-05 | 2013-05-29 | 四川石油天然气建设工程有限责任公司 | Earthing system for cathode protection |
| CN203056116U (en) * | 2012-12-20 | 2013-07-10 | 北京碧海舟腐蚀防护工业股份有限公司 | Grounding grid system |
| CN103899883A (en) * | 2014-04-03 | 2014-07-02 | 中国石油集团工程设计有限责任公司 | Oil and gas pipeline comprehensive protection method for high-voltage direct-current grounding electrode interference |
| CN105239078A (en) * | 2015-01-26 | 2016-01-13 | 陕西延长石油（集团）有限责任公司管道运输公司 | Anti-corrosion method for in-station pipeline of oil transportation station |
| CN206310241U (en) * | 2016-10-11 | 2017-07-07 | 陕西宇阳石油科技工程有限公司 | A kind of gas pipeline gas-oil valve grounding-for-lightning device |
| CN109868481A (en) * | 2019-03-22 | 2019-06-11 | 中国石油天然气集团公司 | The means of defence that oil-gas pipeline is interfered by HVDC transmission line earthing pole location |
| CN116029244A (en) * | 2022-12-09 | 2023-04-28 | 广州大学 | Buried metal pipeline equivalent circuit model under influence of direct current ground current |
-
2021
- 2021-12-03 CN CN202111467913.0A patent/CN114150320B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001313101A (en) * | 2000-04-27 | 2001-11-09 | Sankosha Corp | Grounding system |
| JP2010001549A (en) * | 2008-06-23 | 2010-01-07 | Tokyo Gas Co Ltd | Cathodic corrosion protection system and cathodic corrosion protection method for underground pipeline |
| JP2012193414A (en) * | 2011-03-16 | 2012-10-11 | Tokyo Gas Co Ltd | Cathodic protection method and cathodic protection system of buried metal pipeline |
| CN202954094U (en) * | 2012-12-05 | 2013-05-29 | 四川石油天然气建设工程有限责任公司 | Earthing system for cathode protection |
| CN203056116U (en) * | 2012-12-20 | 2013-07-10 | 北京碧海舟腐蚀防护工业股份有限公司 | Grounding grid system |
| CN103899883A (en) * | 2014-04-03 | 2014-07-02 | 中国石油集团工程设计有限责任公司 | Oil and gas pipeline comprehensive protection method for high-voltage direct-current grounding electrode interference |
| CN105239078A (en) * | 2015-01-26 | 2016-01-13 | 陕西延长石油（集团）有限责任公司管道运输公司 | Anti-corrosion method for in-station pipeline of oil transportation station |
| CN206310241U (en) * | 2016-10-11 | 2017-07-07 | 陕西宇阳石油科技工程有限公司 | A kind of gas pipeline gas-oil valve grounding-for-lightning device |
| CN109868481A (en) * | 2019-03-22 | 2019-06-11 | 中国石油天然气集团公司 | The means of defence that oil-gas pipeline is interfered by HVDC transmission line earthing pole location |
| CN116029244A (en) * | 2022-12-09 | 2023-04-28 | 广州大学 | Buried metal pipeline equivalent circuit model under influence of direct current ground current |
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| CN114150320A (en) | 2022-03-08 |
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