CN106896303A - Three-dimensional measurement device and method for spark discharge of lightning protection grounding body of power system - Google Patents
Three-dimensional measurement device and method for spark discharge of lightning protection grounding body of power system Download PDFInfo
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- CN106896303A CN106896303A CN201710240059.1A CN201710240059A CN106896303A CN 106896303 A CN106896303 A CN 106896303A CN 201710240059 A CN201710240059 A CN 201710240059A CN 106896303 A CN106896303 A CN 106896303A
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- G01R31/1272—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/08—Measuring arrangements characterised by the use of optical techniques for measuring diameters
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Elimination Of Static Electricity (AREA)
Abstract
The invention discloses a three-dimensional measuring device and a three-dimensional measuring method for spark discharge of a lightning protection grounding body of an electric power system, which can accurately measure the spark discharge phenomenon of the grounding body on soil under the action of high-amplitude impact current from a three-dimensional angle and realize real-time three-dimensional shooting of an electric tree during spark discharge of a 'grounding body-soil' combined gap. The measuring device has the advantages of high shooting success rate, clear effect, measurable breakdown radius, detachable assembly, no occupation of test site area, convenient and easy operation and the like.
Description
Technical field
The present invention relates to a kind of technical field of power system lightning protection, more particularly to a kind of power system lightning protection
The three-dimensional measuring apparatus and method of body spark discharge.
Background technology
Grounded screen is that basic overvoltage protection in the power domains such as power station, transformer station and ultra-high-tension power transmission line sets
Apply, it is ensured that Power System Shortcuts high current and lightning current are released to greatly, are reduced to operation power personal security and power equipment
Overvoltage infringement.For a long time, power system ground connection field is generally special as evaluation Grounding using power frequency earthing resistance
Property unique parameters, in fact, when short circuit current or lightning current pass through grounding body diffusing, grounding body often embodies inductance effect
Should, capacity effect and spark discharge effect, under the influence of many electromagnetic propertys, its impedance ground value connects grounded screen with power frequency
Ground resistance value differs greatly, and the impulse grounding characteristic of grounding body more meets ground connection diffusing physical process in itself.In recent years, power train
Uniting to grounded screen, the impulse grounding characteristic that embodies more is paid attention under dash current effect, and gradually makees Transient grounding resistance
To evaluate the important indicator of Grounding performance.
Inductive effect, capacity effect and spark discharge under to grounded screen amplitude lightning current or short circuit current effect
When effect is analyzed or tests, first two is typically analyzed by ripe electric network theory and can realize accurately measuring, and
Spark discharge effect of the grounding body in soil be influence Transient grounding resistance most important process, the process time it is of short duration and
Mechanism is extremely complex, is related to the multiple fields such as electricity, magnetics, calorifics and geology, there is no mathematics or thing both at home and abroad at present
Reason model describes this discharge process, can only be analyzed test by physical simulation experiment.Conventional power system is carrying out this examination
X-ray image technology is used when testing, but the technology need to carry out experiment arrangement under absolute half-light, and two-dimensional imaging can only be carried out
Shoot, electric discharge branch shot by the embedded photographic film of multiple spot, then substantially estimate each point thermoelectricity discharge degree of strength from
And analyze the spark discharge physical process of whole grounding body.The implementation Process difficulty is big, and success rate is extremely low, relatively costly, and only
Energy approximate estimation, it is impossible to realize the shooting of the grounding body spark discharge physical process of integrality.
The content of the invention
The technical problems to be solved by the invention are, there is provided a kind of three-dimensional measurement of power system lightning-proof grounding body spark discharge
Power system lightning-proof grounding body Spark Discharges conveniently and accurately can be carried out three dimensional viewing and survey by device and method
Amount.
In order to solve the above technical problems, the three-dimensional the invention provides a kind of power system lightning-proof grounding body spark discharge is surveyed
Amount device, including：
Grounding box, it is the transparent cabinet of the upper end open being made up of four side box walls and bottom boxboard；
Inside the grounding box, the bottom boxboard and/or the covering of four side box walls are provided with discharge plate, the discharge electrode
Plate passes through ground connection；
Grounding body is internally provided with the grounding box, described grounding body one end is hanging, and the other end is connected with a connecting line, and
The connector is arranged with insulating sleeve, the grounding body and the side box wall of the casing four and bottom with the connecting line junction
There is discharging gap in layer boxboard；
Simulation soil, is contained in the grounding box and covers the grounding body, and the insulating sleeve at least some is exposed
The upper surface of the simulation soil.
Wherein, four side box walls and bottom boxboard of the grounding box are constituted using transparent acrylic material, its four sides case
Mutually fixed by insulated bolt between wall, connected by fluted body track between its bottom bottom and tank wall, the insulated bolt is used
Epoxy resin, nylon, polytetrafluoroethylene (PTFE) or acrylic material.
Wherein, the grounding body covers the compound earthing material of steel, copper or soft graphite using round steel, band steel, galvanized steel, copper.
Wherein, the discharge plate is the metallic plate for being attached to tank wall and bottom, and discharging gap is constituted with grounding body, described to put
Battery lead plate cuts out preparation by iron sheet or Copper Foil.
Wherein, the simulation soil is mixed with boiling water by agar powder and formed.
Wherein, described connecting line one end is connected with power supply, and the other end is connected with grounding body, the connecting line with ground connection
Can be fixed using Wiring nose or bolt between body, its material is copper stranded conductor；The insulating sleeve uses high voltage insulating materials, including
One of epoxy resin, nylon, fiberglass, Teflon material are planted.
Correspondingly, another aspect of the present invention, also provides a kind of three-dimensional survey of power system lightning-proof grounding body spark discharge
Amount method, comprises the following steps：
The grounding box is assembled, and discharge plate is covered in grounding box, discharge plate is connected with connecting wires；
Grounding body is suspended on grounding box center away from one end insulated wire of connecting line, and the grounding body is integrally protected
Water holding level state；
Agar powder is stirred into clear viscous shape colloid according to appropriate than adding into boiling water, that pours into that connection finishes connects
In ground case, the thick colloid is set to cover the grounding body, and insulating sleeve at least some is exposed the thick glue
The upper surface of body；
Whole grounding box is stood and naturally cools to room temperature, make colloid solidification, and form simulation soil after standing the scheduled time；
Impulse current generator terminals are connected the connecting line of grounding box, after the completion of connection, and firing test electric current, make simulation
Clearly spark discharge branch vestige is produced in soil.
Wherein, the step of firing test electric current is specially：Test current is adjusted to the μ s of waveform 2.6/50, peak value
60kA, and start.
Implement the present invention, with following beneficial effect：
The present invention provides the three-dimensional measuring apparatus and method of a kind of power system lightning-proof grounding body spark discharge, can simulate electric power
System earth net Transient grounding resistance and Spark Discharges, can produce clearly spark discharge branch in soil is simulated
Vestige, such that it is able to the spark discharge branch vestige is carried out it is three-dimensional shoot measurement, to adopt that shoot in this way success rate high, clap
Take the photograph effect clear, puncturing radius can survey；Detachable assembling is provided simultaneously with, test site area is not take up, it is easy to operate etc.
Advantage；
Therefore the device and method for using the present invention to provide, can Spark Discharges be carried out with accurate description and measurement, it is electric power
The design and construction of system earth net provides powerful guarantee, and it meets reliability, easily construction requirement, with important actual work
Journey application value.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing skill
The accompanying drawing to be used needed for art description is briefly described, it should be apparent that, drawings in the following description are only the present invention
Some embodiments, for those of ordinary skill in the art, without having to pay creative labor, can be with root
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is an a kind of reality of the three-dimensional measuring apparatus of power system lightning-proof grounding body spark discharge that the present invention is provided
Apply the structural representation of example；
Fig. 2 is the principle schematic of the bottom with tank wall cooperation of grounding box in Fig. 1.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clearly and completely
Description, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.Based on this hair
Embodiment in bright, the every other implementation that those of ordinary skill in the art are obtained under the premise of creative work is not made
Example, belongs to the scope of protection of the invention.
The present invention relates to the three-dimensional measuring apparatus and method of a kind of power system lightning-proof grounding body spark discharge, relate generally to
The occasions such as a kind of power system power station, transformer station, transmission line of electricity are carrying out the design of lightning-proof grounding body, construction and experiment when institute
The experimental rig for needing, the device can accurately observe grounding body under the effect of amplitude dash current to the fire of soil from three-dimensional perspective
Flower electric discharge phenomena.
As shown in figure 1, showing a kind of three-dimensional measurement of power system lightning-proof grounding body spark discharge of present invention offer
The schematic diagram of device one embodiment.In the embodiment, the three-dimensional measuring apparatus include：
Grounding box 1, it is the transparent cabinet of the upper end open being made up of four side box walls 10 and bottom boxboard 11, specifically, institute
Four side box walls 10 and bottom boxboard 11 for stating grounding box are constituted using transparent acrylic material, by exhausted between its four side box wall 10
Edge bolt is mutually fixed, and is connected by fluted body track 100 between its bottom bottom 11 and tank wall 10（It is shown in Figure 2）, it is described
Insulated bolt is made of epoxy resin, nylon, polytetrafluoroethylene (PTFE) or acrylic material；In a specific example, this connects
The length of ground case 1 takes 0.5m ~ 2m, and width is 0.5m ~ 2m, is highly 0.5 ~ 1m, and each tank wall of grounding box 1 is saturating using 20mm thickness
Bright acrylic glass preparation, by each tank wall of connection of being perforated to sheet material, a diameter of 12mm of insulated bolt, reach is 40mm,
The depth of the guide rail of left and right sides tank wall is 10mm, is highly 11mm；It is understood that above-mentioned size is only for example, and respectively
Gap between tank wall can carry out encapsulation process in outside with adhesive tape；
In the inside of the grounding box 1, covering is provided with discharge plate 3, institute on the side box wall of the bottom boxboard 11 and/or four
Discharge plate 3 is stated to be grounded by ground wire 4；Show to set discharge plate 3 on bottom boxboard 11 in Fig. 1, it is to be understood that
The discharge plate 11 can also be arranged on tank wall simultaneously, and specifically, the discharge plate 3 is to be attached to tank wall and/or bottom
Metallic plate, can be that the metallic plate being prepared from is cut out using such as 0.3 ~ 1mm of thickness iron sheets or Copper Foil, for example, at one
In example, can be using the Copper Foil of thickness 0.8mm；The ground wire 4 can use copper stranded conductor, for will realize experiment impact electricity
Flow and put to greatly；
Grounding body 20 is internally provided with the grounding box, the one end of the grounding body 20 is hanging, the other end and the phase of a connecting line 21
Connection, and the connector 20 is arranged with insulating sleeve 22, the grounding body 20 and the case with the junction of the connecting line 21
There is discharging gap in the side box wall 10 of body four and bottom boxboard 11；Wherein, the grounding body 20 is using round steel, band steel, zinc-plated
Steel, copper cover the compound earthing material of steel, copper and soft graphite, and its length can typically take grounding box less than the overall length of grounding box
The distance between 80% or so of overall length, grounding body and each tank wall or bottom should be in more than 10cm；Specifically, the connecting line 21
One end is connected with power supply, and the other end is connected with grounding body 20, and wiring can be used between the connecting line 21 and grounding body 20
Nose or bolt are fixed, and its material can be copper stranded conductor, and sectional area is typically in 30mm2More than, the insulating sleeve 22 uses high pressure
Insulating materials, material is exhausted including epoxy resin, nylon, fiberglass, Teflon etc., to ensure between connecting line 21 and simulation soil
Reliable insulation, its pipe thickness is typically no less than 5mm；
Simulation soil（It is not shown）, for simulating soil media during spark discharge, it is contained in the grounding box 1 and covers
The grounding body 20, and the insulating sleeve 22 is at least a part of（Such as more than 20cm）Expose the upper surface of the simulation soil,
Configured during boiling water typically can be added using agar powder, and solidification is formed.
Correspondingly, the embodiment of the present invention additionally provides a kind of three-dimensional measurement side of power system lightning-proof grounding body spark discharge
Method, specifically, the method comprises the following steps：
Step one, assemble grounding box 1 as shown in Figure 1, and the covering discharge plate 3 in grounding box 1, by discharge plate 3 with connect
Electric wire 4 is connected；
Step 2, by grounding body 20 away from connecting line 21 one end insulated wire（Such as thin cotton thread）It is suspended on the center of grounding box 1
Position so that grounding body 20 is overall to keep horizontality；
Step 3, by agar powder according to appropriate than adding into boiling water, stirring to form clear viscous shape colloid, pours into connection
In the grounding box 1 for finishing, the thick colloid is set to cover a part for the grounding body 20 and insulating sleeve 22, and make insulation
At least a part of upper surface for exposing the thick colloid of sleeve pipe 22；
Step 4, by whole grounding box 1 stand naturally cool to room temperature, make colloid solidification to transparent solid-state, then stand pre- timing
Between（Such as 24 hours）Form simulation soil；
Step 5, the connecting line that impulse current generator terminals are connected grounding box, after the completion of connection, and firing test electricity
Stream, specifically, in one example, waveform 2.6/50 μ s is adjusted to by test current, and peak value 60kA simultaneously starts.In making transparent colloid
Clearly spark discharge branch vestige is produced, is measured such that it is able to carry out three-dimensional shooting to the spark discharge branch vestige, used
It is high that this mode shoots success rate, and shooting effect is clear, and puncturing radius can survey；
It is understood that need to adjust impulse current generator before experiment, to ensure dash current energy regular picture.
Implement the present invention, with following beneficial effect：
The present invention provides the three-dimensional measuring apparatus and method of a kind of power system lightning-proof grounding body spark discharge, can simulate electric power
System earth net Transient grounding resistance and Spark Discharges, can produce clearly spark discharge branch in soil is simulated
Vestige, such that it is able to the spark discharge branch vestige is carried out it is three-dimensional shoot measurement, to adopt that shoot in this way success rate high, clap
Take the photograph effect clear, puncturing radius can survey；Therefore the device and method for using the present invention to provide, essence can be carried out to Spark Discharges
Really description and measurement, for the design and construction of power system grounded screen provides powerful guarantee, it meets, and reliable, easily construction will
Ask, be worth with important practical engineering application.
Above disclosed is only a kind of preferred embodiment of the invention, can not limit the power of the present invention with this certainly
Sharp scope, therefore the equivalent variations made according to the claims in the present invention, still belong to the scope that the present invention is covered.
Claims (8)
1. a kind of three-dimensional measuring apparatus of power system lightning-proof grounding body spark discharge, it is characterised in that including：
Grounding box, it is the transparent cabinet of the upper end open being made up of four side box walls and bottom boxboard；
Inside the grounding box, the bottom boxboard and/or the covering of four side box walls are provided with discharge plate, the discharge electrode
Plate passes through ground connection；
Grounding body is internally provided with the grounding box, described grounding body one end is hanging, and the other end is connected with a connecting line, and
The connector is arranged with insulating sleeve, the grounding body and the side box wall of the casing four and bottom with the connecting line junction
There is discharging gap in layer boxboard；
Simulation soil, is contained in the grounding box and covers the grounding body, and the insulating sleeve at least some is exposed
The upper surface of the simulation soil.
2. a kind of three-dimensional measuring apparatus of power system lightning-proof grounding body spark discharge as claimed in claim 1, its feature exists
In four side box walls and bottom boxboard of the grounding box use transparent acrylic material, by insulation spiral shell between its four side box wall
Bolt is mutually fixed, and is connected by fluted body track between its bottom bottom and tank wall, the insulated bolt using epoxy resin, nylon,
Polytetrafluoroethylene (PTFE) or acrylic material.
3. a kind of three-dimensional measuring apparatus of power system lightning-proof grounding body spark discharge as claimed in claim 2, its feature exists
In the grounding body covers the compound earthing material of steel, copper or soft graphite using round steel, band steel, galvanized steel, copper.
4. a kind of three-dimensional measuring apparatus of power system lightning-proof grounding body spark discharge as claimed in claim 3, its feature exists
In the discharge plate is the metallic plate for being attached to tank wall and bottom, and discharging gap is constituted with grounding body, and the discharge plate passes through
Iron sheet or Copper Foil cut out preparation.
5. a kind of three-dimensional measuring apparatus of power system lightning-proof grounding body spark discharge as claimed in claim 4, its feature exists
In the simulation soil is mixed with boiling water by agar powder and formed.
6. a kind of three-dimensional measuring apparatus of power system lightning-proof grounding body spark discharge as claimed in claim 5, its feature exists
In described connecting line one end is connected with power supply, and the other end is connected with grounding body, is used between the connecting line and grounding body
Wiring nose or bolt are fixed, and its material is copper stranded conductor；The insulating sleeve uses high voltage insulating materials, including epoxy resin, Buddhist nun
One of dragon, fiberglass, Teflon material are planted.
7. a kind of method for three-dimensional measurement of power system lightning-proof grounding body spark discharge, it is such as claim any one of 1-6
Realized in three-dimensional measuring apparatus, it is characterised in that comprise the following steps：
The grounding box is assembled, and discharge plate is covered in grounding box, discharge plate is connected with connecting wires；
Grounding body is suspended on grounding box center away from one end insulated wire of connecting line, and the grounding body is integrally protected
Water holding level state；
Agar powder is stirred into clear viscous shape colloid according to appropriate than adding into boiling water, that pours into that connection finishes connects
In ground case, the thick colloid is set to cover the grounding body, and insulating sleeve at least some is exposed the thick glue
The upper surface of body；
Whole grounding box is stood and naturally cools to room temperature, make colloid solidification, and form simulation soil after standing the scheduled time；
Impulse current generator terminals are connected the connecting line of grounding box, after the completion of connection, and firing test electric current, make simulation
Clearly spark discharge branch vestige is produced in soil.
8. a kind of method for three-dimensional measurement of power system lightning-proof grounding body spark discharge as claimed in claim 7, its feature exists
It is specially the step of, the firing test electric current：Test current is adjusted to waveform 2.6/50 μ s, peak value 60kA, and is started.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710240059.1A CN106896303A (en) | 2017-04-13 | 2017-04-13 | Three-dimensional measurement device and method for spark discharge of lightning protection grounding body of power system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710240059.1A CN106896303A (en) | 2017-04-13 | 2017-04-13 | Three-dimensional measurement device and method for spark discharge of lightning protection grounding body of power system |
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| CN106896303A true CN106896303A (en) | 2017-06-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710240059.1A Pending CN106896303A (en) | 2017-04-13 | 2017-04-13 | Three-dimensional measurement device and method for spark discharge of lightning protection grounding body of power system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113311297A (en) * | 2021-05-19 | 2021-08-27 | 中国电力科学研究院有限公司 | Method for observing three-dimensional discharge morphology of soil around grounding device |
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| CN102944771A (en) * | 2012-10-24 | 2013-02-27 | 中国电力科学研究院 | Simulation experiment device and method of alternating current, direct current and impact performance of large earth screen |
| CN102926406A (en) * | 2012-10-25 | 2013-02-13 | 陕西电力科学研究院 | Method for restricting electric field intensity of soil around grounding body and separating soil discharge passage |
| CN204287003U (en) * | 2014-12-05 | 2015-04-22 | 国家电网公司 | A kind of for grounded screen accelerated corrosion test device |
| CN206725706U (en) * | 2017-04-13 | 2017-12-08 | 深圳供电局有限公司 | Three-dimensional measuring device for spark discharge of lightning protection grounding body of power system |
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| CN113311297A (en) * | 2021-05-19 | 2021-08-27 | 中国电力科学研究院有限公司 | Method for observing three-dimensional discharge morphology of soil around grounding device |
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