CN108020739A - A kind of method for reducing deep well grounding electrode maximum current density - Google Patents
A kind of method for reducing deep well grounding electrode maximum current density Download PDFInfo
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- CN108020739A CN108020739A CN201711224975.2A CN201711224975A CN108020739A CN 108020739 A CN108020739 A CN 108020739A CN 201711224975 A CN201711224975 A CN 201711224975A CN 108020739 A CN108020739 A CN 108020739A
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- deep well
- grounding electrode
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The invention discloses a kind of method for reducing deep well grounding electrode maximum current density, include the following steps：S1 determines deep well grounding electrode parameter according to actual conditions；Parameters of the S2 in S1 is modeled, and calculates grounding electrode electric current Density Distribution and surface potential distribution；S3 determines the specifications parameter of auxiliary overflow polar ring according to actual conditions in S1；S4 carries out verification calculating to the deep well grounding electrode for adding auxiliary overflow polar ring；S5 calculates whether step voltage meets regulatory requirements, and adjustment auxiliary polar ring parameter accordingly；S6 is distributed by surface potential relatively determines coverage of the auxiliary polar ring to environment.The method, which has, to be implemented simply, and pair deep well grounding electrode for maximum occur with top current density has the advantages that good inhibiting effect.
Description
Technical field
The present invention relates to high-voltage dc transmission electrical domain, and in particular to a kind of side for reducing deep well grounding electrode maximum current density
Method.
Background technology
The DC transmission engineering overwhelming majority built now is the mode of bipolar both ends neutral ground, this mode
DC transmission system is needed by earthing pole in normal work come the out-of-balance current in scattered system of overflowing, in monopolar ground return
Mode or also need in the case of breaking down is overflow rated current or fault current in scattered system by earthing pole.Therefore, in direct current
In transmission system, the grounding characteristics of earthing pole are extremely important.
Earthing pole in DC transmission engineering built at present is mainly horizontal shallow buried type earthing pole, only waxy common wheat power transmission
Pu'er current conversion station of ± 800kV DC transmission engineering sending ends in Guangdong employs vertical grounding electrode, and up to the present, do not have also
An example runs the deep well grounding electrode used in Practical Project.The major advantage of horizontal shallow buried type earthing pole has construction is simple,
Scattered effect of overflowing to electric current is good, and common circular ring type grounding electrode electric current, which overflows, to be dissipated uniformly, without end effect；Shortcoming is then floor space
Greatly, height is required pole location, is usually built in the few Plain opening of people.In order to solve problem of the earthing pole in addressing, examine
Consider the earthing pole using vertical-type.The earthing pole of vertical-type is less to land seizure, and does not require pole location landform flat, therefore can
To greatly reduce the difficulty of earthing pole addressing.But vertical-type earthing pole conductor is linear pattern conductor, and end overflow density is big, fever
Seriously, and the larger heat dissipation of the depth of burying is difficult.Deep-well compares conventional vertical earthing pole, and number of conductors is few, and the depth of burying is big, heat dissipation
More difficult, control end current density is more important, it is proposed that one kind is close for limiting deep well grounding electrode end conductor electric current
The method of degree.
The content of the invention
In order to overcome shortcoming and deficiency existing in the prior art, the present invention provides a kind of reduction deep well grounding electrode maximum current
The method of density.
The present invention aids in overflow polar ring by adding a circular ring shape above deep well grounding electrode, portion of electrical current is passed through auxiliary
Help overflow polar ring to carry out excessive scattered, reduce the maximum overflow density on electrode.
The present invention adopts the following technical scheme that：
A kind of method for reducing deep well grounding electrode maximum current density, includes the following steps：
S1 determines the parameter of Practical Project middle-deep well earthing pole, and deep well grounding electrode is embedded in deep-well, deep-well in the prior art
In generally filled up by coke, the earth conductor of deep well grounding electrode is inserted in coke layer, the parameter include deep well grounding electrode
Number, the depth of every mouthful of deep-well, the arrangement form of deep-well, the depth of burying and it is corresponding it is embedded ground soil types and earthing pole overflow it is scattered
The size of stream.
S2 establishes deep well grounding electrode model according to the parameter determined in S1 in CDEGS, and carries out simulation calculation to it, obtains
Preliminary current distributions and surface potential distribution situation on to earthing pole；
S3 determines the parameter of addition auxiliary overflow polar ring, including aid in overflow pole according to the parameter of S1 middle-deep well earthing poles
Ring size, the auxiliary overflow polar ring depth of burying, auxiliary overflow polar ring laying coke layer thickness, the auxiliary overflow polar ring level are set
Put, be normally at the top of deep well grounding electrode, or be arranged in parallel with the upper end of deep well grounding electrode, pass through electricity with deep well grounding electrode
Cable connects, and the general depth of burying is 3-5 meters.
S4 adds auxiliary overflow polar ring in the deep well grounding electrode model of CDEGS, and deep well grounding electrode is emulated again
Calculate, calculate current distributions and surface potential distribution situation on earthing pole, while calculate the step voltage size of earth's surface.
The auxiliary overflow polar ring is arranged on the top of deep well grounding electrode conductor.
S5 compares the step voltage size being calculated and Practical Project step voltage limit value, if be calculated across
Step voltage is more than engineering step voltage limit value, then repeatedly S3, adjustment aid in the parameter of overflow polar ring, such as increase polar ring radius and increasing
Add depth of burying etc.；If the step voltage being calculated meets engineering step voltage limit value, S6 is carried out.
S6 is contrasted the ammeter current potential that S4 is calculated with not increasing the surface potential of auxiliary overflow polar ring, determines to increase
Add scope of the auxiliary overflow polar ring to earth surface effects, not plus before auxiliary overflow polar ring, electric current is by deep well grounding electrode in distance
The deeper place of earth's surface, which overflow, to be dissipated, small to earth surface effects.After adding auxiliary overflow polar ring, there is portion of electrical current from close to earth's surface
Auxiliary overflow polar ring, which overflow, to be dissipated, and may increase the influence to earth's surface, therefore need to be assessed.
The step voltage limit value is calculated according to the following formula：
Umax=5+0.03 ρs
Wherein UmaxFor step voltage limit value, ρsFor upper soll layer resistivity.
Beneficial effects of the present invention：
This method can reduce the maximum current density of deep well grounding electrode, be transported for DC transmission system monopolar ground return
Line mode leaves the nargin of bigger, while implements relatively simple, it is easy to accomplish.
Brief description of the drawings
Fig. 1 is the deep well grounding electrode model for not adding auxiliary overflow ring；
Fig. 2 is overflow density not plus during auxiliary overflow polar ring along earthing pole conductor distribution situation；
Fig. 3 is deep well grounding electrode model after addition auxiliary overflow polar ring；
Fig. 4 be after addition auxiliary overflow polar ring overflow density along earthing pole conductor distribution situation
Fig. 5 be addition auxiliary overflow polar ring after and be not added with auxiliary overflow polar ring when surface potential distribution comparison diagram.
Embodiment
With reference to embodiment and attached drawing, the present invention is described in further detail, but embodiments of the present invention are not
It is limited to this.
Embodiment
A kind of method for reducing deep well grounding electrode maximum current density, includes the following steps：
S1 assumes that certain deep well grounding electrode is made of three mouthfuls of deep-wells, every mouthful of deep-well depth 1000m, in equilateral three that the length of side is 100m
Angular arrangement, the depth of burying take 4m, and earthing pole conductor is taken as a diameter of 550mm of coke layer around the round steel conductor of Φ 70.According to
± 800kV extra-high voltage DC transmission system rated current the values of 500MW, take that to flow through the earth current of earthing pole be 3125A.Examine
Consider the low soil model of deep well grounding electrode addressing prioritizing selection lower soil resistivity, therefore take typical hierarchical soil model such as table
Shown in 1：
1 stratified soil resistivity of table
Parameters of the S2 in S1 establishes deep well grounding electrode model as shown in Figure 1, and being calculated excessive scattered in CDEGS
Current density is with the distribution of earthing pole conductive surface as shown in Fig. 2, and calculating surface potential distribution situation, such as Fig. 5 at this time.
S3 is according to the deployment scenarios of S1 middle-deep well earthing poles, and it is 57.735m to take auxiliary overflow polar ring radius, and the depth of burying is
4m, at this time aid in polar ring just with deep well grounding electrode conductor upper-end contact.
Parameters of the S4 in S3, auxiliary overflow polar ring such as Fig. 3 institutes are added in the deep well grounding electrode model established in S2
Show, the radius of auxiliary overflow polar ring 2 is equal to the radius of deep well grounding electrode 1 and the situation of buried depth with buried depth, and deep-well is connect again
Earth polar model carries out simulation calculation, and it is 2.913V that maximum stride voltage at this time, which is calculated, and scattered current density edge of overflowing is calculated
It is as shown in Figure 4 the distribution of earthing pole conductor.It can be seen that after addition auxiliary overflow polar ring, maximum current on deep well grounding electrode conductor
Density is from 8.1A/m-2It is reduced to 6.9A/m-2, have dropped 15% or so.
S5 step voltage limit values are calculated as the following formula：
Umax=5+0.03 ρs
Wherein UmaxFor step voltage limit value, ρsFor upper soll layer resistivity, it is calculated under () soil model, across
Step voltage limits are 9.5V, and step voltage is met the requirements.
Calculate surface potential after adding auxiliary overflow polar ring to be distributed, the results are shown in Figure 5.
S6 contrasts, which add auxiliary overflow polar ring and do not add surface potential under auxiliary overflow polar ring, to be distributed, as a result such as Fig. 5 institutes
Show.As can be seen that influence of the addition auxiliary overflow polar ring to surrounding environment is not substantially change, it is approximate after distance is more than 300m
It is just the same.
Above-described embodiment is the preferable embodiment of the present invention, but embodiments of the present invention and from the embodiment
Limitation, other any Spirit Essences without departing from the present invention with made under principle change, modification, replacement, combine, simplification,
Equivalent substitute mode is should be, is included within protection scope of the present invention.
Claims (6)
- A kind of 1. method for reducing deep well grounding electrode maximum current density, it is characterised in that include the following steps：S1 determines the parameter of Practical Project middle-deep well earthing pole, and the parameter includes earthing pole conductor parameter, earthing pole buries ginseng Number, soil model and DC transmission system are overflow scattered size of current by earthing pole；S2 establishes deep well grounding electrode model according to the parameter determined in S1 in CDEGS, and carries out simulation calculation to it, is connect Preliminary current distributions and surface potential distribution situation on earth polar；S3 determines the parameter of addition auxiliary overflow polar ring, including aid in overflow polar ring big according to the parameter of S1 middle-deep well earthing poles Small, the auxiliary overflow polar ring depth of burying and auxiliary overflow polar ring laying coke layer thickness；S4, which is established in S2 in deep well grounding electrode model, adds auxiliary overflow polar ring, carries out emulation meter to deep well grounding electrode again Calculate, recalculate current distributions and ammeter Potential distribution situation on earthing pole, while the step voltage for calculating earth's surface is big It is small；S5 is calculated step voltage and is compared with the step voltage limit value set in Practical Project, if the electricity that strides being calculated Pressure is more than the step voltage limit value that sets in Practical Project, then the repeatedly parameter of S3, then adjustment auxiliary overflow polar ring, after making calculating Step voltage be less than or equal to step voltage limit value, then carry out S6；S6 is contrasted the ammeter current potential that S4 is calculated with not increasing the surface potential of auxiliary overflow polar ring, determines that increase is auxiliary Help scope of the overflow polar ring to earth surface effects.
- 2. according to the method described in claim 1, it is characterized in that, in the S5, adjustment aids in the parameter of overflow polar ring, specifically For：Increase polar ring radius and the increase depth of burying.
- 3. according to the method described in claim 1, it is characterized in that, the auxiliary overflow polar ring is arranged on the upper of deep well grounding electrode Side is parallel with the upper end of deep well grounding electrode, and is electrically connected with deep well grounding electrode.
- 4. according to the method described in claim 1, it is characterized in that, the Practical Project middle-deep well earthing pole conductor parameter is also wrapped Include number, the depth and arrangement form of every mouthful of deep-well of deep well grounding electrode.
- 5. according to the method described in claim 1, it is characterized in that, the step voltage limit value is calculated according to the following formula：Umax=5+0.03 ρsWherein UmaxFor step voltage limit value, ρsFor upper soll layer resistivity.
- 6. according to the method described in claim 3, it is characterized in that, 3 meters -5 meters of the auxiliary overflow polar ring depth of burying, horizontal Set.
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| CN201711224975.2A CN108020739B (en) | 2017-11-29 | 2017-11-29 | Method for reducing maximum current density of deep well grounding electrode |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112035990A (en) * | 2020-09-18 | 2020-12-04 | 国网湖南省电力有限公司 | Simulation system for deep well grounding electrode of extra-high voltage direct current transmission line |
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