CN104332727B - A kind of utilization displacement current improves the centralized earthing device and method for arranging of characteristics of the dispersed flow - Google Patents

A kind of utilization displacement current improves the centralized earthing device and method for arranging of characteristics of the dispersed flow Download PDF

Info

Publication number
CN104332727B
CN104332727B CN201410640835.3A CN201410640835A CN104332727B CN 104332727 B CN104332727 B CN 104332727B CN 201410640835 A CN201410640835 A CN 201410640835A CN 104332727 B CN104332727 B CN 104332727B
Authority
CN
China
Prior art keywords
earthing
grounding
centralized
displacement current
arranging
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201410640835.3A
Other languages
Chinese (zh)
Other versions
CN104332727A (en
Inventor
齐飞
周卫华
陈俊武
周恒逸
赵邈
段绪金
叶会生
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
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
Original Assignee
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
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 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 filed Critical State Grid Corp of China SGCC
Priority to CN201410640835.3A priority Critical patent/CN104332727B/en
Publication of CN104332727A publication Critical patent/CN104332727A/en
Application granted granted Critical
Publication of CN104332727B publication Critical patent/CN104332727B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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 the centralized earthing device and method for arranging that a kind of utilization displacement current improves characteristics of the dispersed flow, including the first earthing or grounding means, the first described earthing or grounding means is embedded in underground, it is characterized in that, also include the second earthing or grounding means, the second described earthing or grounding means is embedded in the lower section of the first earthing or grounding means, parallel to each other and do not contact with the first earthing or grounding means.The grounding design of centralized earthing device is the composite can be widely applied to, resulting earthing or grounding means has resistance reducing effect substantially, and construction and installation are easy, can greatly improve the security of Operation of Electric Systems.

Description

A kind of utilization displacement current improves the centralized earthing device and method for arranging of characteristics of the dispersed flow
Technical field
It is more particularly to a kind of to improve diffusing spy using displacement current the present invention relates to power system Lightning protection field The centralized earthing device and method for arranging of property.
Background technology
Operation of Electric Systems experience have shown that, thunderbolt is the main original for causing most of transformer stations and transmission line of electricity trip accident Because, and the impulse earthed resistance of its centralized earthing device directly influences transformer station, the lightning protection properties of circuit.In high electric resistance of soil Rate area, because the impulse earthed resistance of earthing or grounding means is often very big, threatens to system safety operation, therefore the high soil of reduction The Transient grounding resistance of earth resistivity area concentration earthing or grounding means is significant for the security for improving power system. The impact drop resistance measure generally used in engineering, which mainly has, to be increased the size of grounding body, utilizes natural grounding substance etc..But these Method respectively has its relative application conditions, meets desired the design of grounding still very difficult.Blindly increase grounding body Size, can not reach impact resistance reducing effect well, be likely to result in the waste of material.
Research shows that diffusing of the dash current in soil is mainly by conducting under electric current and displacement current collective effect Complete.Due to soil and non-conductor, it has medium character simultaneously, therefore, and displacement current account for very big by one in diffusing electric current Part.Especially for high resistivity area, displacement current has very important commonly greater than conduction electric current during diffusing Effect.
The content of the invention
In order to solve the technical problem that earthing or grounding means is unable to reach preferably impact resistance reducing effect, the present invention provides one kind just Improve centralized earthing device and the arrangement side of characteristics of the dispersed flow in the utilization displacement current realized and there is splendid impact resistance reducing effect Method.
In order to realize above-mentioned technical purpose, the technical scheme is that, one kind improves characteristics of the dispersed flow using displacement current Centralized earthing device, including the first earthing or grounding means, the first described earthing or grounding means is embedded in underground, also including the second ground connection dress Put, the second described earthing or grounding means is embedded in the lower section of the first earthing or grounding means, it is parallel to each other and do not contact with the first earthing or grounding means.
A kind of described utilization displacement current improves the centralized earthing device of characteristics of the dispersed flow, and the second described earthing or grounding means is adopted With with the first earthing or grounding means identical earthing or grounding means.
A kind of described utilization displacement current improves the centralized earthing device of characteristics of the dispersed flow, what centralized earthing device was formed Electric capacity C is:
C=ε S/d
Wherein, ε is soil dielectric constant, and S is the facing area of the first earthing or grounding means and the second earthing or grounding means, and d is first The distance between earthing or grounding means and the second earthing or grounding means.
A kind of utilization displacement current improves the method for arranging of the centralized earthing device of characteristics of the dispersed flow, and the first ground connection is buried first Device, then in embedded second earthing or grounding means of the first earthing or grounding means parallel beneath, and two earthing or grounding means are not in contact with each other.
A kind of described utilization displacement current improves the method for arranging of the centralized earthing device of characteristics of the dispersed flow, described second Earthing or grounding means is used and the first earthing or grounding means identical earthing or grounding means.
A kind of described utilization displacement current improves the method for arranging of the centralized earthing device of characteristics of the dispersed flow, concentrates ground connection dress Putting formed electric capacity C is:
C=ε S/d
Wherein, ε is soil dielectric constant, and S is the facing area of the first earthing or grounding means and the second earthing or grounding means, and d is first The distance between earthing or grounding means and the second earthing or grounding means.
Double-deck centralized earthing device is substantially to improve the capacity effect of grounding body over the ground, i.e. basis
C=ε S/d
Understand to choose the distance between suitable two layers of centralized earthing device to increase electric capacity.Due to lightning current equivalent frequency Height, and high frequency electric easily circulates in capacitive reactances.Therefore using the high frequency electric feature, electric current is made to run through electric capacity progress Release to reach the purpose of raising characteristics of the dispersed flow.
The grounding design of centralized earthing device is the composite can be widely applied to, resulting earthing or grounding means has resistance reducing effect Substantially, construction and installation are easy, can greatly improve the security of Operation of Electric Systems.
Brief description of the drawings
Fig. 1 is the schematic diagram of the 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 is simulated test platform schematic diagram;
Wherein 1 it is the first earthing or grounding means, 2 is the second earthing or grounding means.
Embodiment
The present invention, which proposes a kind of utilization displacement current, improves the earthing or grounding means method for arranging of characteristics of the dispersed flow.It is of the invention main It is by installing double-deck centralized earthing device, accelerating the velocity of liquid assets of displacement current, increase diffusing area, so as to reach raising punching Stream efficiency is smashed, the purpose of Transient grounding resistance is reduced, and provides the impact characteristics simulation examination for the centralized earthing device Platform schematic diagram is tested, to study the impact resistance reducing effect of individual layer and double-deck earthing or grounding means.Just the operating method of the present invention is made below Further instruction:
Referring to Fig. 1, in the present embodiment, the first earthing or grounding means length of side value in upper strata is 5x5m, and earthing material is zinc-plated Band steel, laying depth 0.8m;The second earthing or grounding means length of side value in lower floor is 13x13m, and laying depth is 3m.Ground connection dress The structure put uses common grounding device constructions, i.e., leave the sphere of movements for the elephants type in space for centre by the conductor material split of strip Structure, the present apparatus can also be implemented using other grounding device constructions.The area of the first earthing or grounding means is smaller in figure, and second connects The area of ground device is larger, and under this is due to general condition, upper layer of soil resistivity is higher, and lower soil resistivity is relatively low, The larger earthing or grounding means of lower floor's erection space can improve diffusing efficiency as primary ground pole, while laying area on upper strata Less auxiliary earthing apparatus, characteristics of the dispersed flow is improved using displacement current, so as to improve the diffusing effect of overall centralized earthing device Really.And in order to maximize levels facing area, two earthing or grounding means be arranged in parallel.
Referring to Fig. 2, nonlinear resistance R1With R2Represent diffusing during because of caused by cremate effect resistance variations, C1For Electric capacity between levels earthing or grounding means, C2For earthing or grounding means direct-to-ground capacitance, and C1Much larger than C2.Under dash current effect, due to Equivalent capacity C1Very big, its capacitive reactance very little, the circulation of favourable displacement current improves the ability that energy is released.
As shown in figure 3, being for verifying that the simulation of a set of centralized earthing device impact characteristics of apparatus of the present invention effect is tried Experiment device.The simulation test device used in the present invention, which mainly includes impact high-voltage large current generator, simulation the earth, to be tested Groove, current divider, impulse voltage divider, digital oscilloscope, earthing or grounding means etc..A set of thunder and lightning that can simulate is have developed for this present invention to rush The packaged type impact high-voltage large current generator pilot system of ripple is hit, the system is by control cabinet, controller and transmission linear system System constitute, can Based Intelligent Control produce voltage x current and generator body ball stand-off distance from, contact action interface is easily understood, It is easy to the progress of simulated test.The material of centralized earthing device in the experiment is identical with actual earthing or grounding means, according to impact The principle of the theory of similarity is tested, size and buried depth press actual conditions scaled down.In experiment using digital oscilloscope record not With dash current under earthing or grounding means and the waveform of surge voltage, the peak value of surge voltage and dash current, and calculating simulation are read The impulse earthed resistance of earthing or grounding means.Show by simulated experiment, double-deck earthing or grounding means can be effectively improved impact diffusing effect.

Claims (2)

1. a kind of utilization displacement current improves the centralized earthing device of characteristics of the dispersed flow, including the first earthing or grounding means, described first Earthing or grounding means is embedded in underground, it is characterised in that also including the second earthing or grounding means, and the second described earthing or grounding means is embedded in first The lower section of earthing or grounding means, it is parallel to each other and do not contact with the first earthing or grounding means, wherein the area of the first earthing or grounding means is smaller, second The area of earthing or grounding means is larger, and the second described earthing or grounding means is used to be connect with the first earthing or grounding means identical earthing or grounding means, concentration The electric capacity C that ground device is formed is:
C=ε S/d
Wherein, ε is soil dielectric constant, and S is the facing area between the first earthing or grounding means and the second earthing or grounding means, and d connects for first The distance between ground device and the second earthing or grounding means.
2. a kind of utilization displacement current improves the method for arranging of the centralized earthing device of characteristics of the dispersed flow, it is characterised in that bury first If the first earthing or grounding means, then in embedded second earthing or grounding means of the first earthing or grounding means parallel beneath, and two earthing or grounding means are mutual not Contact, wherein the area of the first earthing or grounding means is smaller, the area of the second earthing or grounding means is larger, and the second described earthing or grounding means is used With the first earthing or grounding means identical earthing or grounding means, the electric capacity C that centralized earthing device is formed is:
C=ε S/d
Wherein, ε is soil dielectric constant, and S is the facing area of the first earthing or grounding means and the second earthing or grounding means, and d is the first ground connection The distance between device and the second earthing or grounding means.
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)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201410640835.3A CN104332727B (en) 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

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201410640835.3A CN104332727B (en) 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

Publications (2)

Publication Number Publication Date
CN104332727A CN104332727A (en) 2015-02-04
CN104332727B true CN104332727B (en) 2017-07-11

Family

ID=52407410

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201410640835.3A Active CN104332727B (en) 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

Country Status (1)

Country Link
CN (1) CN104332727B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
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

Family Cites Families (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
JP5876845B2 (en) * 2013-03-13 2016-03-02 公益財団法人鉄道総合技術研究所 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

Also Published As

Publication number Publication date
CN104332727A (en) 2015-02-04

Similar Documents

Publication Publication Date Title
CN102841280B (en) Method for simulating lightning trip-out rates of 500kV transmission line with four circuits on same tower
Haddad et al. Experimental investigation of the impulse characteristics of practical ground electrode systems
CN104332727B (en) A kind of utilization displacement current improves the centralized earthing device and method for arranging of characteristics of the dispersed flow
Banjanin et al. Lightning protection of overhead transmission lines using external ground wires
CN204257834U (en) A kind of centralized earthing device utilizing displacement current to improve characteristics of the dispersed flow
El Mghairbi et al. Technique to increase the effective length of practical earth electrodes: Simulation and field test results
Elgayar et al. Induced voltages on a gas pipeline due to lightning strikes on nearby overhead transmission line
Prasad et al. Soil resistivity and earthing system
Esmaeilian et al. Wind farm grounding systems design regarding the maximum permissible touch & step voltage
Elmghairbi et al. Potential rise and safety voltages of wind turbine earthing systems under transient conditions
Li et al. Lightning transient characteristics of cable power collection system in wind power plants
Liu et al. Research on electromagnetic character of 500/220kV mixed-voltage quadruple-circuit transmission line
Gouda et al. Parameters affecting the back flashover across the overhead transmission line insulator caused by lightning
CN202384676U (en) Grounding net of urban indoor 220kV transformer substation
CN103647270A (en) +/-800 kV extra high voltage DC line grounding arrangement method and system
Lehtonen et al. Ground potential rise and lightning overvoltages in control systems of large power-plants under high soil resistivity
Araneo et al. Transient response of grounding systems of wind turbines under lightning strikes
Elmghairbi et al. A technique to increase the effective length of horizontal earth electrodes and its application to a practical earth electrode system
Adelian Improvement of substation earthing
Nikolovski et al. Frequency and time response of power plant grounding system exposed to lightning strike
Siahpoosh et al. Wind farm grounding system analysis
CN203707350U (en) Grounding device for improving tower grounding safety
CN103166141A (en) Grounding grid of urban full-indoor transformer substation of 220kV
Phayomhom et al. Safety analysis for grounding system of two neighbouring substations in MEA's power distribution system
Omidiora et al. Simulation performance of lightning discharges around medium voltage underground cables

Legal Events

Date Code Title Description
PB01 Publication
C06 Publication
SE01 Entry into force of request for substantive examination
C10 Entry into substantive examination
GR01 Patent grant
GR01 Patent grant