CN115441342A - Surrounding grounding system of air-core reactor and arrangement method thereof - Google Patents
Surrounding grounding system of air-core reactor and arrangement method thereof Download PDFInfo
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- 239000002689 soil Substances 0.000 claims abstract description 18
- 230000005672 electromagnetic field Effects 0.000 claims abstract description 15
- 238000004088 simulation Methods 0.000 claims abstract description 11
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 9
- 229910052802 copper Inorganic materials 0.000 claims description 9
- 239000010949 copper Substances 0.000 claims description 9
- 230000035515 penetration Effects 0.000 claims description 3
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- 238000010586 diagram Methods 0.000 description 10
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- 238000010438 heat treatment Methods 0.000 description 2
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- 230000007547 defect Effects 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B5/00—Non-enclosed substations; Substations with enclosed and non-enclosed equipment
- H02B5/01—Earthing arrangements, e.g. earthing rods
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
A grounding system around an air core reactor and an arrangement method thereof are disclosed, the method comprises the following steps: step 1, performing electromagnetic field modeling according to the actual distribution condition of the air-core reactors of the transformer substation, wherein the electromagnetic field modeling comprises modeling of an air-core reactor area, a terminal box, a cable trench and soil; step 2, modeling loops of a primary grounding system and a secondary grounding system according to the distribution condition of the primary ground grid and the distribution condition of the cable trench; step 3, setting a primary ground screen height range h according to the primary ground screen actual limit and the secondary ground screen actual limit 1 Secondary height range of the ground screen h 2 The secondary ground screen has various arrangement modes; step 4, setting a primary ground screen, a secondary ground screen and a specific arrangement mode; and performing electromagnetic field simulation to obtain a loop current result, and selecting the mode with the minimum loop current as the optimal arrangement mode according to the simulation result. By the method, the influence of the magnetic field of the air reactor and the induced current in the primary and secondary ground network loops can be reduced.
Description
Technical Field
The invention relates to the field of magnetic field safety protection of an air reactor of an ultra/extra-high voltage transformer substation, in particular to a surrounding grounding system of the air reactor and an arrangement method thereof.
Background
High-strength space magnetic fields are distributed around the air reactor of the ultra/extra-high voltage transformer substation, and a primary grounding copper bar and a secondary grounding copper bar are arranged in a terminal box around the reactor and are respectively connected to a shielding layer and an armor layer of a grounding armored shielding cable. At present, the wiring mode of the shielding layer armor layer has no unified regulation, and the grounding of two ends of the shielding layer and the grounding of two ends of the armor layer are the current mainstream grounding mode. In actual operation, two grounding wires may be in short circuit due to construction and operation and maintenance factors, and a primary grounding grid loop and a secondary grounding grid loop are formed through the grounding wires. If the loop is located in a high-magnetic-field area such as an air reactor, large loop current is easily generated, heating of the grounding armored shielding cable is caused, and if the loop cannot be found in time, accidents such as fire disasters and the like can be caused, and even power grid accidents are finally caused.
The influence of the air core reactor is not fully considered in the design of the current transformer substation and the grounding grid, and other grounding system arrangement mode designs are not designed at present.
In the research literature, relevant research by domestic and foreign scholars is not discovered for a while, because the air reactor belongs to common equipment in an ultra/extra-high voltage transformer substation, a cable grounding wire is the guarantee of equipment safety, and both the cable grounding wire and the cable grounding wire are indispensable, the circulation overheating of a primary grounding grid and a secondary grounding grid is avoided, and therefore, the arrangement mode of the air reactor is designed, the air reactor is prevented from entering an area of the air reactor, or the circulation is reduced when the air reactor enters the area of the air reactor, the safety of a grounding system is ensured, the safety coefficient of the grounding system of the transformer substation is improved, and the air reactor has great significance for ensuring a secondary protection system of the transformer substation.
Disclosure of Invention
In order to solve the defects in the prior art, the invention provides a grounding system around an air reactor and an arrangement method thereof.
The invention adopts the following technical scheme.
A method for arranging a grounding system around an air core reactor comprises the following steps:
step 1, performing electromagnetic field modeling according to the actual distribution condition of the air-core reactors of the transformer substation, wherein the electromagnetic field modeling comprises modeling of an air-core reactor area, a terminal box, a cable trench and soil;
step 2, modeling loops of a primary grounding system and a secondary grounding system according to the distribution condition of the primary ground grid and the cable trench model obtained in the step 1;
step 3, obtaining the actual limits of the primary ground grid and the secondary ground grid according to the loop models of the primary ground system and the secondary ground system in the step 2, and setting the height range h of the primary ground grid 1 Two isHeight range h of sub-floor net 2 ；
Step 4, according to the primary ground screen height range h of the step 3 1 Secondary ground net height range h 2 Setting a primary grounding grid, a secondary grounding grid and a specific arrangement mode, carrying out electromagnetic field simulation to obtain a loop current result, and selecting the mode with the minimum loop current as the optimal arrangement mode of the grounding system.
Further, in the step 1, the modeling of the air reactor region specifically includes the setting of a canopy, a coil component, an insulating component and a supporting component, three-phase guide lines of the air reactor region, and the determination of the number and distribution intervals of the air reactors;
the terminal box modeling specifically comprises setting distribution positions, shell sizes, primary ground grids and secondary ground grids at the distribution positions of the terminal box;
the cable trench modeling comprises the steps of setting a cable trench area;
the soil modeling comprises soil conductivity and magnetic permeability setting.
Furthermore, in the step 2, the primary grounding system and the secondary grounding system form a loop at the terminal box, are respectively connected into the primary grounding grid through the cable trench, are connected into the secondary grounding grid through the special copper bar, and form a loop through various connection modes.
Furthermore, in the terminal box, the primary ground net is connected with the armor layer of the armored shielding cable, and the secondary ground net is connected with the shielding layer of the armored shielding cable.
Further, in the step 3, the height variation range of the secondary ground net is set to be h according to the actual cable trench height 2 Setting the height variation range of the primary ground net as h according to the limitation of the ground penetration depth of the primary ground net 1 ；
The secondary ground screen has various arrangement modes.
Further, in the step 4, according to the result of the analysis of the induced voltage, the induced voltage/line resistance = induced current, and the arrangement mode with the minimum induced current is the optimum arrangement mode of the grounding system;
further, the air core reactor is a coreless reactor which is peculiar to a transformer substation.
Further, the height of the land where the primary land net is located can be adjusted, and the adjustment height is limited to h 1 。
Furthermore, the distribution height of the special copper bars in the cable trench is adjustable, and the adjustment height is h 2 (ii) a The cable trench is in a cross distribution mode, wherein the secondary earth screen can be horizontally arranged, vertically arranged and arranged in a comprehensive mode.
Further, the primary ground grid, the secondary ground grid and the specific arrangement mode are set by an enumeration method;
in the step 4, electromagnetic field simulation is performed by adopting ANSYS.
Further, the grounding system around the air reactor comprises an air reactor area, a terminal box, a cable trench and soil;
a cable trench is arranged below the air-core reactor area, and soil is arranged below the cable trench;
the terminal box is arranged on one side of the air-core reactor area and is located above the cable trench.
Further, the air reactor area is composed of a plurality of air reactors, and an air reactor area three-phase lead wire is arranged on one side of each air reactor.
The method has the advantages that compared with the prior art, the method for designing the arrangement mode of the secondary grounding system around the air reactor of the ultra/extra-high voltage transformer substation can simulate actual situations by establishing the air reactor, the primary grounding system, the secondary grounding system loop, a soil system and the like, and can obtain the arrangement mode of the grounding system for inhibiting the primary loop and the secondary loop with minimum current by designing the heights and the connection modes of the primary ground net and the secondary ground net, so that the influence of the air reactor is reduced to the minimum, the loop current is ensured to be the minimum even if the primary ground net and the secondary ground net form the loop, the heating of an armored shielding cable is not caused, and the operation safety of the secondary ground net is ensured.
Drawings
FIG. 1 is a schematic diagram of a primary grounding system and a secondary grounding system loop of a grounding system around an air-core reactor;
FIG. 2 is a schematic diagram of an air core reactor modeling of an air core reactor surrounding ground system;
FIG. 3 is a terminal box modeling diagram of a grounding system around an air core reactor;
FIG. 4 is a schematic diagram of a grounding system around an air core reactor;
FIG. 5 is a loop model diagram of a primary grounding system and a secondary grounding system of a method for arranging a grounding system around an air-core reactor;
FIG. 6 is a schematic diagram of a preferred embodiment of a method for arranging a grounding system around an air core reactor;
FIG. 7 is a schematic diagram of an induced voltage simulation result of a method for arranging a grounding system around an air-core reactor;
fig. 8 is a design flowchart of a method for arranging the grounding system around the air-core reactor.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. The embodiments described herein are only some embodiments of the invention, and not all embodiments. All other embodiments obtained by a person skilled in the art without any inventive step based on the spirit of the present invention are within the scope of the present invention.
A method for arranging a grounding system around an air-core reactor comprises the following specific steps:
step 1, performing electromagnetic field modeling according to the actual distribution condition of the air-core reactors of the transformer substation, wherein the electromagnetic field modeling comprises modeling of an air-core reactor area, a terminal box, a cable trench and soil;
the air reactor area modeling specifically comprises setting a rainshelter, a coil component, an insulating component, a supporting component and three-phase guide lines in an air reactor area, determining the number, distribution intervals and the like of the air reactors, and a figure 2 is a hollow reactor modeling diagram;
the terminal box modeling specifically comprises setting distribution positions, shell sizes, primary ground screens and secondary ground screens at the distribution positions of the terminal box, and fig. 3 is a terminal box modeling diagram;
the cable trench modeling comprises the steps of setting a cable trench area;
the soil modeling comprises soil conductivity and magnetic permeability setting.
Step 2, modeling loops of a primary grounding system and a secondary grounding system according to the distribution condition of the primary ground grid and the cable trench model obtained in the step 1;
the primary grounding system and the secondary grounding system form a loop at the terminal box, are respectively connected into the primary ground net through a cable duct, are connected into the secondary ground net through a special copper bar, and form the loop through various connection modes. As shown in fig. 5, a certain connection mode is realized by connecting in a horizontal and vertical direction;
as shown in fig. 1, in the terminal box, the primary ground net is connected to the armor layer of the armored and shielded cable, and the secondary ground net is connected to the shield layer of the armored and shielded cable.
Step 3, obtaining the actual limits of the primary and secondary ground nets according to the loop modeling of the primary and secondary grounding systems in the step 2, and setting the height range h of the primary ground net 1 Secondary ground net height range h 2 The secondary ground screen has various arrangement modes;
setting the height variation range of the secondary ground net as h according to the actual cable trench height 2 Setting the height variation range of the primary ground net as h according to the limitation of the ground penetration depth of the primary ground net 1 As shown in fig. 6. There are various connection modes between the primary and secondary grounding systems.
Step 4, according to the primary ground screen height range h of the step 3 1 Secondary ground screen height range h 2 Setting a primary ground grid, a secondary ground grid and a specific arrangement mode, carrying out electromagnetic field simulation to obtain a loop current result, and selecting the mode with the minimum loop current as the optimal arrangement mode of the grounding system;
setting the primary ground screen, the secondary ground screen and the specific arrangement mode by adopting an enumeration method;
performing electromagnetic field simulation by adopting ANSYS;
according to the analysis result of the induced voltage, the induced voltage/line resistance = induced current, and the arrangement mode with the minimum induced current is the optimal arrangement mode of the grounding system. FIG. 7 shows the simulation result of induced voltage.
The design flow of the arrangement method of the grounding system around the air-core reactor is shown in fig. 8.
FIG. 4 is a schematic diagram of an air core reactor surrounding grounding system including an air core reactor region, a terminal box, a cable trench and soil;
a cable trench is arranged below the hollow reactor area, and soil is arranged below the cable trench;
the terminal box sets up in air-core reactor regional one side, and is located the cable pit top.
The air reactor area is composed of a plurality of air reactors, and three-phase guide lines in the air reactor area are arranged on one sides of the air reactors.
The air core reactor is a special iron-core-free reactor of a transformer substation.
The position of the primary ground net and the secondary ground net is not easy to change due to the need of comprehensively considering the design of the in-station area and the like, but the height of the land where the primary ground net is located has a margin for adjustment, and the adjustment height is limited to h 1 The distribution height of the special copper bar in the cable trench can be adjusted, and the adjustment height is h 2 . The cable trench is mostly in a cross distribution mode, and the secondary ground nets can be horizontally arranged, vertically arranged and arranged in a comprehensive mode.
The position of the primary ground net and the secondary ground net is not easy to change due to the design of comprehensively considering the area in the station and the like, but the height of the land where the primary ground net is located has a margin of adjustment, and the adjustment height is limited to h 1 The distribution height of the special copper bar in the cable trench can be adjusted, and the adjustment height is h 2 . The cable trench is mostly in a cross distribution mode, and the secondary ground nets can be horizontally arranged, vertically arranged and arranged in a comprehensive mode.
The method for designing the arrangement mode of the grounding system around the air reactor based on the principle of minimum induced current can be suitable for designing any grounding system of the air reactor, and by applying the design method, the magnetic field influence of the air reactor can be reduced, the circulating current of a primary grounding system and a secondary grounding system can be reduced, and the normal operation of equipment in the area of the air reactor can be guaranteed.
Compared with the prior art, the method for designing the arrangement mode of the secondary grounding system around the air reactor of the ultra/extra-high voltage transformer substation has the advantages that the arrangement mode of the grounding system for inhibiting the primary and secondary loop currents to the minimum can be obtained by establishing the simulation actual situation of the air reactor, the primary and secondary grounding system loops, the soil system and the like and designing the heights and the connection modes of the primary and secondary grounding grids, the influence of the air reactor is reduced to the minimum, the loop currents are minimum even if the primary and secondary grounding grids form loops, the armored shielding cable is not heated, and the operation safety of the secondary grounding grid is ensured.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (12)
1. A method of arranging a grounding system around an air-core reactor, the method comprising the steps of:
step 1, performing electromagnetic field modeling according to the actual distribution condition of the air-core reactors of the transformer substation, wherein the electromagnetic field modeling comprises modeling of an air-core reactor area, a terminal box, a cable trench and soil;
step 2, modeling loops of a primary grounding system and a secondary grounding system according to the distribution condition of the primary ground grid and the cable trench model obtained in the step 1;
step 3, obtaining the actual limit of the primary ground grid and the actual limit of the secondary ground grid according to the loop modeling of the primary ground system and the secondary ground system in the step 2,setting a primary height range h of the ground screen 1 Secondary ground net height range h 2 ；
Step 4, according to the primary ground screen height range h of the step 3 1 Secondary ground net height range h 2 Setting a primary grounding grid, a secondary grounding grid and a specific arrangement mode, carrying out electromagnetic field simulation to obtain a loop current result, and selecting the mode with the minimum loop current as the optimal arrangement mode of the grounding system.
2. A method of arranging a grounding system around an air-core reactor according to claim 1, characterized in that:
in the step 1, the modeling of the air reactor area specifically comprises the steps of arranging a rain shelter, a coil part, an insulating part, a supporting part and three-phase guide lines in the air reactor area, and determining the number and distribution intervals of the air reactors;
the terminal box modeling process comprises the steps of setting distribution positions, shell sizes, primary ground screens and secondary ground screens at the distribution positions of the terminal box;
the cable trench modeling comprises the steps of setting a cable trench area;
the soil modeling comprises soil conductivity and magnetic permeability setting.
3. A method of arranging a grounding system around an air-core reactor according to claim 1, characterized in that:
in the step 2, the primary grounding system and the secondary grounding system form a loop at the terminal box, are respectively connected into the primary ground net through the cable trench, are connected into the secondary ground net through the special copper bar, and form the loop through various connection modes.
4. A method of arranging an air-core reactor surrounding ground system according to claim 3, characterized in that:
in the terminal box, the primary ground net is connected with the armor layer of the armored shielding cable, and the secondary ground net is connected with the shielding layer of the armored shielding cable.
5. The arrangement method of the air-core reactor surrounding ground system according to claim 1, characterized in that:
in the step 3, the height variation range of the secondary ground net is set to be h according to the actual cable trench height 2 Setting the height variation range of the primary ground net as h according to the limitation of the ground penetration depth of the primary ground net 1 ；
The secondary ground screen has various arrangement modes.
6. The arrangement method of the air-core reactor surrounding ground system according to claim 1, characterized in that:
in the step 4, according to the analysis result of the induced voltage, the induced voltage/line resistance = induced current, and the arrangement mode with the minimum induced current is the optimal arrangement mode of the grounding system.
7. The arrangement method of the air-core reactor surrounding ground system according to claim 1, characterized in that:
the air core reactor is a special iron-core-free reactor of a transformer substation.
8. The arrangement method of the air-core reactor surrounding ground system according to claim 1, characterized in that:
the height of the land where the primary ground net is located can be adjusted, and the limitation of the adjusting height is h 1 。
9. A method of arranging a grounding system around an air-core reactor according to claim 1, characterized in that:
the distribution height of the special copper bar in the cable trench is adjustable, and the adjustment height is h 2 ；
The cable trench is in a cross distribution mode, wherein the secondary ground nets can be horizontally arranged, vertically arranged and arranged in a comprehensive mode.
10. The arrangement method of the air-core reactor surrounding ground system according to claim 1, characterized in that:
the primary ground net, the secondary ground net and the specific arrangement mode are set by an enumeration method;
in the step 4, electromagnetic field simulation is performed by adopting ANSYS.
11. An air-core reactor surrounding ground system arranged by the arranging method according to any one of claims 1 to 10, characterized in that:
the grounding system around the air reactor comprises an air reactor area, a terminal box, a cable trench and soil;
a cable trench is arranged below the air-core reactor area, and soil is arranged below the cable trench;
the terminal box is arranged on one side of the air-core reactor area and is located above the cable trench.
12. An air-core reactor surrounding ground system according to claim 11, characterized in that:
the air reactor area is composed of a plurality of air reactors, and three-phase guide lines in the air reactor area are arranged on one sides of the air reactors.
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| CN202211150704.8A CN115441342B (en) | 2022-09-21 | 2022-09-21 | Hollow reactor peripheral grounding system and arrangement method thereof |
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| CN202211150704.8A CN115441342B (en) | 2022-09-21 | 2022-09-21 | Hollow reactor peripheral grounding system and arrangement method thereof |
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