CN109613341A - A measuring device for the contact resistance between grounding material and soil - Google Patents
A measuring device for the contact resistance between grounding material and soil Download PDFInfo
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- CN109613341A CN109613341A CN201910068925.2A CN201910068925A CN109613341A CN 109613341 A CN109613341 A CN 109613341A CN 201910068925 A CN201910068925 A CN 201910068925A CN 109613341 A CN109613341 A CN 109613341A
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- soil
- grounding body
- contact resistance
- grounding
- measuring device
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/20—Measuring earth resistance; Measuring contact resistance, e.g. of earth connections, e.g. plates
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/08—Measuring resistance by measuring both voltage and current
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Resistance Or Impedance (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
本发明公开了一种接地材料与土壤接触电阻的测量装置，包括上端开口的有机玻璃盒、铝板和接地体以及交流电流源，铝板采用两块，分别安装在有机玻璃盒左右两内侧壁处，有机玻璃盒中填充有土壤层，接地体竖直插接到土壤层中部，交流电流源一端通过绝缘铜线连接电流表，电流表另一端连接于接地体顶端，两块铝板均通过绝缘铜线连接在交流电流源另一端，接地体与其中一铝板间通过绝缘铜线连接有电压表。本发明的装置能够实现接地材料的接地体的接地电阻测量，结构简单，操作方便，测试容易，而且土壤层便于更换不同的土壤和接地体材料也便于更换，测试灵活性好，测试范围宽，接地材料与土壤接触电阻的测试设备成本大大降低。
The invention discloses a measuring device for the contact resistance between a grounding material and soil, which comprises a plexiglass box with an open upper end, an aluminum plate, a grounding body, and an alternating current source. The organic glass box is filled with the soil layer, the grounding body is vertically inserted into the middle of the soil layer, one end of the AC current source is connected to the ammeter through an insulated copper wire, and the other end of the ammeter is connected to the top of the grounding body. At the other end of the AC current source, a voltmeter is connected between the grounding body and one of the aluminum plates through an insulated copper wire. The device of the invention can realize the grounding resistance measurement of the grounding body of the grounding material, and has the advantages of simple structure, convenient operation, easy testing, and the soil layer is easy to replace with different soil and grounding body materials, and has good testing flexibility and wide testing range. The cost of testing equipment for the contact resistance of grounding materials to soil is greatly reduced.
Description
Technical field
The invention belongs to earth resistance equipment technical fields, and in particular to a kind of earthing material and soil contact resistance
Measuring device.
Background technique
Operation of Electric Systems is experience have shown that lightning stroke is State Grid Corporation of China one of the main reason for causing transmission line of electricity to trip
Lightning protection is classified as first of transmission line of electricity " six anti-", it is right with the continuous improvement of transmission line of electricity voltage class and transmission capacity
The resistance to thunder of route is horizontal, and more stringent requirements are proposed.In order to reduce the tripping rate with lightning strike of transmission line of electricity, O&M unit is not stinted defeated
A large amount of capital investment is increased in terms of electric line lightning protection, taking reduces pole tower ground resistance, reduces earth-wire protection angle, peace
Fill leakage conductor, a series of lightning protection measures of installing auto recloser etc., these measures to transmission line of electricity lightning protection without
It doubts and all plays a role.However, " lightning protection is to be grounded ", good ground connection is the basic of power system security reliability service
Guarantee, if imperfect earth, the lightning protection measures such as lightning rod, arrester all can not effectively play a role.
Practical earth work design is all based on desired contact, seldom considers the influence of contact resistance, works as unit in charge of construction
After the completion of grounded screen laying, the compactness between grounding body and soil is improved usually by the way of being backfilling and compacted, but
Since the elasticity modulus of metallic ground material is larger, and soil is in unsetting loose form, therefore contact of the grounding body with soil is
Point contact rather than completely attach to, this has resulted in the presence of contact resistance.When soil is by external forces such as frost heave, rheology, sedimentations
When, the case where the air gap between grounding body and soil increases, most serious is that grounding body and soil large area is caused to be detached from.When
When the air gap between grounded screen and soil increases, the contact resistance of grounded screen and soil increases therewith, in addition, metallic ground material
The corrosion of material in the soil will also result in the increase of contact resistance.Therefore accurate estimation is lacked to the nargin of ground resistance, in spy
Different soil region (such as Rock Region, permafrost region) is likely to occur grounding construction and is difficult to reach the case where design standard requires.
There is no the measurement methods that document proposes contact resistance between grounding body and soil both at home and abroad all the time, therefore,
A kind of measuring device of grounding body contact resistance is designed, provides a kind of thinking for the scientific measurement reckoning of grounding body contact resistance,
To improving, ground grid design is horizontal and the work of scientific guidance grounding resistance-reducing has certain meaning.
Summary of the invention
Technical problem solved by the present invention is the measuring device of a kind of earthing material and soil contact resistance is provided, with solution
Certainly above-mentioned the technical problems existing in the prior art.
The technical scheme adopted by the invention is as follows: a kind of measuring device of earthing material and soil contact resistance, including upper end
Organic glass box, aluminium sheet and the grounding body and ac current source of opening, aluminium sheet use two pieces, are separately mounted to organic glass box
At two inner sidewalls of left and right, soil horizon is filled in organic glass box, grounding body is plugged into vertically in the middle part of soil horizon, ac current source
One end connects ammeter by insulated copper wire, and the ammeter other end is connected to grounding body top, and two blocks of aluminium sheets pass through insulated copper
Line is connected to the ac current source other end, is connected with voltmeter by insulated copper wire between grounding body and wherein an aluminium sheet.
Preferably, above-mentioned grounding body upper end connects insulated copper wire by metal anchor ear.
Preferably, above-mentioned grounding body includes round steel and graphite, and diameter is 10mm ~ 30mm.
Preferably, above-mentioned aluminium sheet and organic glass box side are equal in magnitude, are pasted by insulative glue.
Preferably, above-mentioned organic glass cassette bottom portion is provided with blind hole, and blind hole is inserted into grounding body lower end.
Beneficial effects of the present invention: compared with prior art, the device of the invention can be realized the grounding body of earthing material
Ground resistance measurement, structure is simple, easy to operate, and test is easy, and soil horizon is conveniently replaceable different soil and ground connection
Body material is also convenient for replacing, and test flexibility is good, and test scope is wide, the test equipment cost of earthing material and soil contact resistance
It substantially reduces.
Detailed description of the invention
Fig. 1 is the structural diagram of the present invention.
1- ac current source, 2- ammeter, 3- voltmeter, 4- soil horizon, 5- organic glass box, 6- aluminium sheet, 7- grounding body,
8- metal anchor ear.
Specific embodiment
With reference to the accompanying drawing and the present invention is described further in specific embodiment.
Embodiment 1: as shown in Figure 1, the measuring device of a kind of earthing material and soil contact resistance, including upper end opening
Organic glass box 5, aluminium sheet 6 and grounding body 7 and ac current source 1, aluminium sheet 6 use two pieces, are separately mounted to organic glass box 5
At two inner sidewalls of left and right, soil horizon 4 is filled in organic glass box 5, grounding body 7 is plugged into 4 middle part of soil horizon, alternating current vertically
1 one end of stream source connects ammeter 2 by insulated copper wire, and 2 other end of ammeter is connected to 7 top of grounding body, and two blocks of aluminium sheets 6 are logical
It crosses insulated copper wire and is connected to 1 other end of ac current source, electricity is connected with by insulated copper wire between grounding body 7 and wherein an aluminium sheet 6
Press table 3, soil horizon 4 can cover grounding body test section, in 5 box of machine glass case length be respectively 300mm × 200mm ×
200mm, thick 5mm.
Preferably, above-mentioned 7 upper end of grounding body connects insulated copper wire by metal anchor ear 8.
Preferably, above-mentioned grounding body 7 includes round steel and graphite, and diameter is 10mm ~ 30mm.
Preferably, above-mentioned aluminium sheet 6 and 5 side of organic glass box are equal in magnitude, and the long generous respectively 200mm of aluminium sheet ×
200mm × 2mm is pasted by insulative glue.
Preferably, above-mentioned 5 bottom of organic glass box is provided with the blind hole of 2mm depth, and blind hole is inserted into 7 lower end of grounding body, can
Positioning action is played, is tested more accurate.
Specific example: ac current source 1 uses TDGC2-1 contact voltage regulator；Ammeter 2 is to use alternating current gear
UT51 multimeter；Voltmeter 3 is the UT51 multimeter using alternating voltage gear；It is filled in organic glass box 5 a certain amount of
Soil horizon 4, soil need to just bury grounding body 7, and by measuring in advance, soil resistivity is 260 Ω m；Organic glass box 5
It is polymerized using polymethyl methacrylate, the length in space is respectively 300mm × 200mm × 200mm, box body in box
Thick 5mm has a diameter 28mm, the circular hole of deep 2mm at bottom center；The size of two blocks of aluminium sheets 6 be 200mm × 200mm ×
2mm is pasted on the two sides of organic glass box 200mm × 200mm using insulative glue, this process need to guarantee aluminium sheet and have
It is pasted between machine glass case side close；Grounding body 7 is a diameter 28mm, the graphite-based flexible ground body of long 200mm and one
The round steel grounding body of diameter 28mm, long 200mm；Grounding body top anchor ear 8 is copper anchor ear.
The circuit connection of device is to be connected to serve as electricity from TDGC2-1 contact voltage regulator (ac current source 1) one end
The UT51 multimeter (ammeter 2) of flow table, the multimeter other end are connected on the anchor ear 8 on grounding body top.Distinguished with conducting resinl
By two insulated copper wire one end copper core bonding partiallies in two pieces of 6 top ends of aluminium sheet, the other end of two insulated copper wires connects after being shorted
It is connected to TDGC2-1 contact voltage regulator (ac current source 1).The UT51 multimeter one end for serving as voltmeter 3, which is connected to be connected to, to be connect
On the anchor ear on ground body top, the copper core of other end insulated copper wire is pasted onto right side 6 top end of aluminium sheet by conducting resinl.It is filled out in device
A certain amount of soil horizon 4 is filled, reaches and just buried grounding body.
Measuring process:
1) connection of route.Circuit is connected by schematic diagram, and voltmeter, ammeter are adjusted to corresponding gear；
2) survey measurements.It is closed power switch, adjustment size of current to Appropriate reads corresponding voltage, current data, fits
When increasing, reducing input current value, continuously reads data three times and be recorded into table, disconnecting power switch；
After the completion of all steps, by measurement and calculate, the contact resistance of unit area between graphite-based flexible ground body and soil
Size is 0.59 Ω m2, and the contact resistance size of unit area is 1.33 Ω m2 between round steel grounding body and soil.By emulation
Analyzing posteriority confirms that the contact resistance surveyed and simulation result error are ± 6.5%, differs smaller, therefore judgement connects through the invention
The contact resistance value that the measuring device measurement of ground material and soil contact resistance obtains is authentic and valid.
In the present invention, since soil types and grounding material can be replaced arbitrarily, flexibly it can measure and calculate
Contact resistance size between soil types and used earthing material in Practical Project, so using the present invention can be practical work
Ground resistance design margin provides certain reference in journey, and to improving, ground grid design is horizontal and scientific guidance grounding resistance-reducing works
There is certain meaning.
Example that the above description is merely a specific embodiment, scope of protection of the present invention is not limited thereto.It is ripe
It knows the those skilled in the art in the technical scope disclosed by the present invention, change or replacement mode can be easily found, these
It should be covered by the protection scope of the present invention.For this purpose, protection scope of the present invention should be with the protection model of the claim
Subject to enclosing.
Claims (5)
1. the measuring device of a kind of earthing material and soil contact resistance, it is characterised in that: the organic glass including upper end opening
Box (5), aluminium sheet (6) and grounding body (7) and ac current source (1), aluminium sheet (6) use two pieces, are separately mounted to organic glass
At two inner sidewalls of box (5) left and right, soil horizon (4) are filled in organic glass box (5), grounding body (7) is plugged into soil horizon vertically
(4) middle part, ac current source (1) one end connect ammeter (2) by insulated copper wire, and ammeter (2) other end is connected to ground connection
Body (7) top, two pieces of aluminium sheets (6) are connected to ac current source (1) other end by insulated copper wire, grounding body (7) with wherein
Voltmeter (3) are connected with by insulated copper wire between one aluminium sheet (6).
2. the measuring device of a kind of earthing material and soil contact resistance according to claim 1, it is characterised in that: ground connection
Body (7) upper end connects insulated copper wire by metal anchor ear (8).
3. the measuring device of a kind of earthing material and soil contact resistance according to claim 1, it is characterised in that: ground connection
Body (7) includes round steel and graphite, and diameter is 10mm ~ 30mm.
4. the measuring device of a kind of earthing material and soil contact resistance according to claim 1, it is characterised in that: aluminium sheet
(6) equal in magnitude with organic glass box (5) side, it is pasted by insulative glue.
5. the measuring device of a kind of earthing material and soil contact resistance according to claim 1, it is characterised in that: organic
Glass case (5) bottom is provided with blind hole, and blind hole is inserted into grounding body (7) lower end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910068925.2A CN109613341A (en) | 2019-01-24 | 2019-01-24 | A measuring device for the contact resistance between grounding material and soil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910068925.2A CN109613341A (en) | 2019-01-24 | 2019-01-24 | A measuring device for the contact resistance between grounding material and soil |
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| CN109613341A true CN109613341A (en) | 2019-04-12 |
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| CN201910068925.2A Pending CN109613341A (en) | 2019-01-24 | 2019-01-24 | A measuring device for the contact resistance between grounding material and soil |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110542797A (en) * | 2019-10-11 | 2019-12-06 | 河南四达电力设备股份有限公司 | method for testing contact performance difference between different grounding materials and soil |
| CN111077181A (en) * | 2019-12-06 | 2020-04-28 | 国网浙江省电力有限公司电力科学研究院 | Device and method for testing thermal contact resistance between outer surface of medium-low voltage cable and soil |
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Application publication date: 20190412 |