CN104332727A - Concentrated grounding device using displacement current to improve flow dispersion characteristic and arrangement method thereof - Google Patents

Concentrated grounding device using displacement current to improve flow dispersion characteristic and arrangement method thereof Download PDF

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Publication number
CN104332727A
CN104332727A CN201410640835.3A CN201410640835A CN104332727A CN 104332727 A CN104332727 A CN 104332727A CN 201410640835 A CN201410640835 A CN 201410640835A CN 104332727 A CN104332727 A CN 104332727A
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China
Prior art keywords
earthing
grounding
displacement current
centralized
improve
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CN201410640835.3A
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CN104332727B (en
Inventor
齐飞
周卫华
陈俊武
周恒逸
赵邈
段绪金
叶会生
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State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Hunan Electric Power Co Ltd
State Grid Hunan Electric Power Co Ltd
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State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Hunan Electric Power Co Ltd
State Grid Hunan Electric Power Co Ltd
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Publication of CN104332727A publication Critical patent/CN104332727A/en
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    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01RELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R4/00Electrically-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
    • H01R4/58Electrically-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
    • H01R4/66Connections with the terrestrial mass, e.g. earth plate, earth pin

Abstract

The invention discloses a concentrated grounding device using displacement current to improve flow dispersion characteristic and an arrangement method thereof. The concentrated grounding device using the displacement current to improve the flow dispersion characteristic comprises a first grounding device and a second grounding device, the first grounding device is embedded under the ground, the second grounding device is embedded below the first grounding device, and the second grounding device is parallel to the first grounding device in a non-contact mode. The concentrated grounding device using the displacement current to improve the flow dispersion characteristic can be broadly used for the grounding design of the concentrated grounding device, and the grounding device is obvious in resistance reducing effect, easy and convenient to construct and mount, and capable of greatly improving the electricity system running safety.

Description

A kind of utilize displacement current to improve characteristics of the dispersed flow centralized earthing device and method for arranging
Technical field
The present invention relates to electric power system Lightning protection field, particularly a kind of utilize displacement current to improve characteristics of the dispersed flow centralized earthing device and method for arranging.
Background technology
Power system operation experience shows, thunderbolt is the main cause causing most of transformer station and transmission line trip accident, and the impulse earthed resistance of its centralized earthing device directly has influence on the lightning protection properties of transformer station, circuit.In high soil resistivity, because the impulse earthed resistance of earthing device is often very large, threaten to system safety operation, the Transient grounding resistance therefore reducing high soil resistivity centralized earthing device is significant for the fail safe improving electric power system.Usually the impact adopted in engineering fall resistance measure mainly contain strengthen earth electrode size, utilize natural grounding substance etc.But these methods respectively have its relative application conditions, the design of grounding met the demands is still very difficult.Blindly increase the size of earth electrode, can not reach and well impact resistance reducing effect, the waste of material may be caused.
Research shows, the diffusing of impulse current in soil is mainly by completing under conduction current and displacement current acting in conjunction.Due to soil and non-conductor, it has medium character simultaneously, and therefore, in diffusing electric current, displacement current account for greatly.Especially for high resistivity area, displacement current is often greater than conduction current, in diffusing process, have very important effect.
Summary of the invention
The technical problem of impacting preferably resistance reducing effect cannot be reached in order to solve earthing device, the invention provides and a kind ofly be convenient to realize and the displacement current that utilizes with splendid impact resistance reducing effect improves centralized earthing device and the method for arranging of characteristics of the dispersed flow.
In order to realize above-mentioned technical purpose, technical scheme of the present invention is, a kind of centralized earthing device utilizing displacement current to improve characteristics of the dispersed flow, comprise the first earthing device, the first described earthing device is embedded in underground, also comprise the second earthing device, the second described earthing device is embedded in the below of the first earthing device, parallel to each other with the first earthing device and do not contact.
Described a kind of centralized earthing device utilizing displacement current to improve characteristics of the dispersed flow, the second described earthing device adopts the earthing device identical with the first earthing device.
Described a kind of centralized earthing device utilizing displacement current to improve characteristics of the dispersed flow, the electric capacity C that centralized earthing device is formed is:
C=εS/d
Wherein, ε is soil dielectric constant, and S is that the right opposite of the first earthing device and the second earthing device amasss, and d is the distance between the first earthing device and the second earthing device.
Utilize displacement current to improve a method for arranging for the centralized earthing device of characteristics of the dispersed flow, first bury the first earthing device underground, bury the second earthing device underground then in the first earthing device parallel beneath, and two earthing device are not in contact with each other.
Described a kind of method for arranging utilizing displacement current to improve the centralized earthing device of characteristics of the dispersed flow, the second described earthing device adopts the earthing device identical with the first earthing device.
Described a kind of method for arranging utilizing displacement current to improve the centralized earthing device of characteristics of the dispersed flow, the electric capacity C that centralized earthing device is formed is:
C=εS/d
Wherein, ε is soil dielectric constant, and S is that the right opposite of the first earthing device and the second earthing device amasss, and d is the distance between the first earthing device and the second earthing device.
Double-deck centralized earthing device is improved in fact earth electrode capacity effect over the ground, i.e. basis
C=εS/d
Knownly choose distance between suitable two-layer centralized earthing device to increase electric capacity.Because lightning current equivalent frequency is high, and high-frequency current easily circulates in capacitive reactances.Therefore utilize this feature of high-frequency current, make electric current be undertaken releasing by electric capacity rapidly thus reach the object improving characteristics of the dispersed flow.
The present invention can be widely used in the grounding design of centralized earthing device, and it is obvious that the earthing device obtained has resistance reducing effect, and construction and installation are easy, greatly can improve the fail safe of power system operation.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of double-deck centralized earthing device of the present invention;
Fig. 2 is the equivalent circuit diagram of the double-deck centralized earthing device of the present invention;
Fig. 3 is that centralized earthing device of the present invention carries out analogue test platform schematic diagram;
Wherein 1 be the first earthing device, 2 is the second earthing device.
Embodiment
The present invention proposes a kind of earthing device method for arranging utilizing displacement current to improve characteristics of the dispersed flow.The present invention is mainly by installing double-deck centralized earthing device, accelerate the velocity of liquid assets of displacement current, increase diffusing area, thus reach raising impact diffusing efficiency, reduce the object of Transient grounding resistance, and the impact characteristics analogue test platform schematic diagram provided for this centralized earthing device, to study the impact resistance reducing effect of individual layer and double-deck earthing device.Just method of operation of the present invention is further described below:
See Fig. 1, in the present embodiment, the first earthing device length of side value being in upper strata is 5x5m, earthing material zinc-coated flat steel sheet, laying depth 0.8m; The the second earthing device length of side value being in lower floor is 13x13m, and laying depth is 3m.The structure of earthing device adopts common grounding device constructions, and be namely the sphere of movements for the elephants type structure that space is left in centre by the conductor material split of strip, this device also can adopt other grounding device constructions to implement.In figure, the area of the first earthing device is less, the area of the second earthing device is larger, this is due under general condition, upper layer of soil resistivity is higher, and lower soil resistivity is lower, at the larger earthing device of lower floor's erection space as primary ground pole, diffusing efficiency can be improved, lay the less auxiliary earthing apparatus of area on upper strata simultaneously, utilize displacement current to improve characteristics of the dispersed flow, thus improve the diffusing effect of overall centralized earthing device.And amass to maximize levels right opposite, two earthing device be arranged in parallel.
See Fig. 2, nonlinear resistance R 1with R 2represent the resistance variations, the C that cause because of cremate effect in diffusing process 1for the electric capacity between levels earthing device, C 2for earthing device direct-to-ground capacitance, and C 1much larger than C 2.Under impulse current effect, due to equivalent capacity C 1very large, its capacitive reactance is very little, the circulation of favourable displacement current, namely improves the ability that energy is released.
As shown in Figure 3, be the simulation test device of a set of centralized earthing device impact characteristics for verifying apparatus of the present invention effect.The simulation test device used in the present invention mainly comprises impact high-voltage large current generator, simulation the earth test flume, shunt, impulse voltage divider, digital oscilloscope, earthing device etc.The present invention have developed and a set ofly the packaged type of lightening strike simulating ripple can impact high-voltage large current generator pilot system for this reason, this system is made up of control cabinet, controller and transmission line system, can Based Intelligent Control produce electric current and voltage and generator body ball stand-off distance from, being easily understood in contact action interface, is convenient to the carrying out of analogue test.The material of the centralized earthing device in described test is identical with actual earthing device, and according to the principle of shock test similarity theory, size and buried depth are by actual conditions scaled down.Use the waveform of impulse current and surge voltage under the different earthing device of digital oscilloscope record in test, read the peak value of surge voltage and impulse current, and the impulse earthed resistance of calculating simulation earthing device.Show through simulated experiment, double-deck earthing device effectively can improve impact diffusing effect.

Claims (6)

1. the centralized earthing device utilizing displacement current to improve characteristics of the dispersed flow, comprise the first earthing device, the first described earthing device is embedded in underground, it is characterized in that, also comprise the second earthing device, the second described earthing device is embedded in the below of the first earthing device, parallel to each other with the first earthing device and do not contact.
2. a kind of centralized earthing device utilizing displacement current to improve characteristics of the dispersed flow according to claim 1, is characterized in that, the second described earthing device adopts the earthing device identical with the first earthing device.
3. a kind of centralized earthing device utilizing displacement current to improve characteristics of the dispersed flow according to claim 1, it is characterized in that, the electric capacity C that centralized earthing device is formed is:
C=εS/d
Wherein, ε is soil dielectric constant, and S is that the right opposite between the first earthing device and the second earthing device amasss, and d is the distance between the first earthing device and the second earthing device.
4. utilize displacement current to improve a method for arranging for the centralized earthing device of characteristics of the dispersed flow, it is characterized in that, first bury the first earthing device underground, bury the second earthing device underground then in the first earthing device parallel beneath, and two earthing device are not in contact with each other.
5. a kind of method for arranging utilizing displacement current to improve the centralized earthing device of characteristics of the dispersed flow according to claim 1, is characterized in that, the second described earthing device adopts the earthing device identical with the first earthing device.
6. a kind of method for arranging utilizing displacement current to improve the centralized earthing device of characteristics of the dispersed flow according to claim 1, it is characterized in that, the electric capacity C that centralized earthing device is formed is:
C=εS/d
Wherein, ε is soil dielectric constant, and S is that the right opposite of the first earthing device and the second earthing device amasss, and d is the distance between the first earthing device and the second earthing device.
CN201410640835.3A 2014-11-13 2014-11-13 A kind of utilization displacement current improves the centralized earthing device and method for arranging of characteristics of the dispersed flow Active CN104332727B (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106785508A (en) * 2016-12-13 2017-05-31 深圳供电局有限公司 A kind of overhead power transmission line pole tower combined type grounded screen
CN107102219A (en) * 2017-03-08 2017-08-29 国网山西省电力公司大同供电公司 A kind of impact diffusing pilot system that earthing material is combined for graphite

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201540969U (en) * 2009-09-03 2010-08-04 庄严 Grounding module with capacitor characteristics
CN202308338U (en) * 2011-11-15 2012-07-04 傅玉洁 Double-layer structure grounding grid with characteristics of effectively improving electric potential distribution and reducing step voltage
JP2014175298A (en) * 2013-03-13 2014-09-22 Railway Technical Research Institute Grounding device
CN204257834U (en) * 2014-11-13 2015-04-08 国家电网公司 A kind of centralized earthing device utilizing displacement current to improve characteristics of the dispersed flow

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201540969U (en) * 2009-09-03 2010-08-04 庄严 Grounding module with capacitor characteristics
CN202308338U (en) * 2011-11-15 2012-07-04 傅玉洁 Double-layer structure grounding grid with characteristics of effectively improving electric potential distribution and reducing step voltage
JP2014175298A (en) * 2013-03-13 2014-09-22 Railway Technical Research Institute Grounding device
CN204257834U (en) * 2014-11-13 2015-04-08 国家电网公司 A kind of centralized earthing device utilizing displacement current to improve characteristics of the dispersed flow

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106785508A (en) * 2016-12-13 2017-05-31 深圳供电局有限公司 A kind of overhead power transmission line pole tower combined type grounded screen
CN106785508B (en) * 2016-12-13 2020-02-21 深圳供电局有限公司 Overhead transmission line shaft tower combination formula ground net
CN107102219A (en) * 2017-03-08 2017-08-29 国网山西省电力公司大同供电公司 A kind of impact diffusing pilot system that earthing material is combined for graphite
CN107102219B (en) * 2017-03-08 2019-09-10 国网山西省电力公司大同供电公司 A kind of impact diffusing pilot system for the compound earthing material of graphite

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