AU2016251185B2 - Ground connection and resistance reduction composite padding for acid red soil and use thereof - Google Patents
Ground connection and resistance reduction composite padding for acid red soil and use thereof Download PDFInfo
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- AU2016251185B2 AU2016251185B2 AU2016251185A AU2016251185A AU2016251185B2 AU 2016251185 B2 AU2016251185 B2 AU 2016251185B2 AU 2016251185 A AU2016251185 A AU 2016251185A AU 2016251185 A AU2016251185 A AU 2016251185A AU 2016251185 B2 AU2016251185 B2 AU 2016251185B2
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R4/00—Electrically-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
- H01R4/58—Electrically-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
- H01R4/66—Connections with the terrestrial mass, e.g. earth plate, earth pin
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Abstract
A ground connection and resistance reduction composite padding for acid red soil and the use thereof. The composite padding is prepared from a raw material comprising the following in mass ratio: 15-35% of conductive graphite, 30-60% of calcium bentonite, 15-35% of sodium bentonite, 2-5% of sodium carbonate, 1-3% of an aluminium powder and 1-3% of a zinc powder. The various components in the ratio are uniformly mixed in a drying environment, and the padding is packaged in barrels or bags and stored and transported in a sealing mode. During site construction, the resistance reduction composite padding and fresh water are blended into a viscous paste in a volume ratio of 2:1 to cover a ground connection material, increasing the effective cross section of the ground connection body; the composite padding and the ground connection body are in tight contact on one hand, and on the other hand, the composite padding and peripheral soil are reliably bonded, eliminating the contact resistance. At the same time, the ground connection body does not generate contact resistance due to corrosion because of the corrosion proof function of the padding itself so as to achieve the purposes of resistance reduction and corrosion resistance.
Description
The invention belongs to the power grounding field, and particularly relates to a ground connection and resistance reduction composite padding for acid red soil and the use thereof.
Background
Soil types in southern provinces in China are similar, and all have certain features of acid red soil. Red soil is mainly distributed on low mountain and hilly regions in China, including: majority of Jiangxi and Hunan, southeast of Yunnan and Hubei, north of Guangdong and Fujian, part of Guizhou, Sichuan, Zhejiang, Anhui and Jiangsu, south of Tibet, etc., with main features of lack of alkali and alkaline earth metal but rich in iron and aluminum oxide, acidity and red color.
In the acid red soil regions, the soil conductivity is low due to leaching loss of base ions, and the resistivity is ΙΟΟΩ-m above generally. The metal corrosion rate in such soil shall be very low according to the general rule. But in fact, the corrosion grades of lots of metal materials are medium above, some materials even reach strong corrosion grade, wherein the corrosion of carbon steel materials is most obvious.
The metallic material corrosion of grounding grid in soil is the electrochemical corrosion mainly, wherein chloride ion and sulfate ion are the main ions resulting in corrosion damage to metal materials. However, chlorine salt and sulfate, such as sodium chloride, calcium chloride, magnesium chloride, sodium sulfate and ammonium sulfate, are added to resistance reducing
2016251185 03 Sep 2018 agents and resistance reduction materials of many grounding grids. Although the conductivity is improved, the corrosion of metal materials of grounding grids is accelerated obviously to endanger the safe operation of power grid equipment severely.
Bentonite is non-metallic mineral, with main mineral composition of montmorillonite, the interlayer cation is easy to exchange, with large ion exchange capacity. The bentonite is divided into sodium bentonite, calcium bentonite, magnesium bentonite and aluminum (hydrogen) bentonite according to the proportion of interlayer exchangeable cations of bentonite to the exchange capacity, with excellent properties of expansibility, adsorbability, cation exchange, suspension and dispersibility. The bentonite resistivity is low since the bentonite contains lots of metallic oxide, such as kalium, sodium, calcium, magnesium, ferrum and titanium, the bentonite can be ionized to produce lots of metallic ions after mixing with water, and also contain lots of semiconductor elements. In addition, since the bentonite has adsorbability and ion exchange property, the bentonite can absorb free ions in water after mixing with water. Therefore, after absorbing water fully, the bentonite contains lots of ions inside, with good conductivity.
In order to further increase the conductivity of bentonite, the bentonite is organically modified with intercalation method generally, and the conductive mechanism of modified bentonite is mainly based on electron conduction. The inorganic bentonite is hydrophilic and oleophobic, macromolecular organic compounds are introduced into the layers, making the bentonite modified, the hydrophilic inorganic bentonite is changed into oleophilic organic bentonite, reducing the ion exchange capacity. However, the preparation process often adopts steps of acidification, ultrasonic dispersion, heating reaction, etc., which greatly increases the production cost. The original price of common bentonite is a few hundred yuan/1000kg, while that of organically modified bentonite reaches more than 10000 yuan/1000kg. The modified bentonite is used for resistance reduction transformation of grounding grid, which is the most important limiting factor for its difficult popularization and application.
Any discussion of the prior art throughout the specification should in no way be considered as an admission that such prior art is widely known or forms part of common general knowledge in the
2016251185 03 Sep 2018 field.
Summary of the Invention
It is an object of the present invention to overcome or ameliorate at least one of the disadvantages of the prior art, or to provide a useful alternative.
Preferred embodiments of the invention provide a ground connection and resistance reduction composite padding for acid red soil and the use thereof. The provided composite padding can suppress acidic corrosion of soil, enhance protective effect for ground connection metallic materials and improve the conductivity obviously, with functions of corrosion prevention and resistance reduction.
In a first aspect, the present invention provides a ground connection and resistance reduction composite padding for acid red soil, wherein the composite padding is prepared from a raw material comprising the following in mass ratio: 15-35% of conductive graphite, 30-60% of calcium bentonite, 15-35% of sodium bentonite, 2-5% of sodium carbonate, 1-3% of aluminum powder and 1-3% of zinc powder.
Unless the context clearly requires otherwise, throughout the description and the claims, the words “comprise”, “comprising”, and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is to say, in the sense of “including, but not limited to”.
Preferably, the particle size of the calcium bentonite is no less than 200 mesh.
Preferably, the particle size of the sodium bentonite is no less than 200 mesh.
Preferably, the particle size of the conductive graphite is no less than 100 mesh; that of the sodium carbonate is no less than 100 mesh; that of the aluminum powder is no less than 100 mesh; that of the zinc powder is no less than 100 mesh.
Preferably, the mass ratio of the conductive graphite is 15-24 %.
Preferably, the mass ratio of the calcium bentonite is 30-45%.
2016251185 03 Sep 2018
Preferably, the mass ratio of the sodium bentonite is 15-20%.
Preferably, the composite padding is alkalescent.
Preferably, the pH value of the composite padding is 9.
The invention also provides the use of ground connection and resistance reduction composite padding for acid red soil. The fresh water and the composite padding are blended to cover a ground connection material.
Preferably, the composite padding and fresh water are blended in a volume ratio of 2:1.
The invention provides a ground connection and resistance reduction composite padding for acid red soil, which is prepared from a raw material comprising the following in mass ratio: 15-35% of conductive graphite, 30-60% of calcium bentonite, 15-35% of sodium bentonite, 2-5% of sodium carbonate, 1-3% of aluminum powder and 1-3% of zinc powder. The invention takes the applicable soil environment into full account. When the acidic materials in soil intrude into the resistance reduction composite padding, the system composed of sodium carbonate and bentonite has strong buffer effect on pH reduction so as to suppress acidic corrosion of soil; aluminum powder and zinc powder added improve the conductivity of the whole system; after the acidic materials and oxidizing substances in soil intrude and react with the aluminum powder and zinc powder, the acidic materials and oxidizing substances are consumed, aluminum and zinc are converted into conductible ions, so that the conductivity is still kept well.
Moreover, the ground connection and resistance reduction composite padding for acid red soil provided by the invention is alkalescent and able to reduce corrosion of acidic materials, with protective effect for metallic materials; the invention adopts the current conventional products and limits the particle size of components. The composite padding has the advantages of simple preparation and easy use, in favor of product popularization and application.
2016251185 03 Sep 2018
During site construction, the composite padding provided by the invention and fresh water are blended into a viscous paste to cover a ground connection material, increasing the effective cross section of the ground connection body; the composite padding and the ground connection body are in tight contact on one hand, and on the other hand, the composite padding and peripheral soil are reliably bonded, basically eliminating the contact resistance. At the same time, the ground connection body does not generate contact resistance due to corrosion because of the corrosion proof function of the padding itself so as to achieve the purposes of resistance reduction and corrosion resistance.
Description of Figures
Figure 1 is the schematic diagram that different water contents of the composite padding prepared in the embodiment of the invention change with time.
Detailed Description of Embodiments
The following further describes the invention in combination with the embodiment and figure.
The invention provides a ground connection and resistance reduction composite padding for acid red soil, which is characterized in that the composite padding is prepared from a raw material comprising the following in mass ratio: 15-35% of conductive graphite, 30-60% of calcium bentonite, 15-35% of sodium bentonite, 2-5% of sodium carbonate, 1-3% of aluminum powder and 1-3% of zinc powder.
The composite padding provided by the invention can suppress acidic corrosion of soil, enhance protective effect for ground connection metallic materials and improve the conductivity obviously, with functions of corrosion prevention and resistance reduction.
The composite padding provided by the invention contains 15-35% (preferably 15%-24%) of conductive graphite in mass ratio. The content of the conductive graphite in the embodiment of this application can be 24% or 26% specifically. In the invention, the particle size of the conductive graphite is no less than 100 mesh preferably; the invention has no special requirements for the source of the conductive graphite, adopting the conductive graphite as long as the
2016251185 03 Sep 2018 technicians in this field get acquainted with it.
The composite padding provided by the invention contains 30-60% (preferably 30%-45%) of calcium bentonite in mass ratio. The content of the calcium bentonite in the embodiment of this application can be 45% or 55% specifically. In the embodiment of the invention, select the higher content of the calcium bentonite within the limited amount range so as to achieve the purpose of corrosion prevention in the acid red soil region with less precipitation. In the invention, the particle size of the calcium bentonite is no less than 200 mesh preferably; the invention adopts the calcium bentonite as long as the technicians in this field get acquainted with it.
The composite padding provided by the invention contains 15-35% (preferably 20%-35%) of sodium bentonite in mass ratio. In the invention, the particle size of the sodium bentonite is no less than 200 mesh preferably; the invention has no special requirements for the source of the sodium bentonite, adopting the sodium bentonite as long as the technicians in this field get acquainted with it.
The composite padding provided by the invention contains 2-5% of sodium carbonate in mass ratio. In the invention, the particle size of the sodium carbonate is no less than 100 mesh preferably. The invention adopts the sodium carbonate as long as the technicians in this field get acquainted with it.
The composite padding provided by the invention contains 1-3% of aluminum powder in mass ratio; the particle size ofthe aluminum powder is no less than 100 mesh preferably. The invention has no special requirements for the source of the aluminum powder, adopting the aluminum powder as long as the technicians in this field get acquainted with it.
The composite padding provided by the invention contains 1-3% of zinc powder in mass ratio; the particle size of the zinc powder is no less than 100 mesh preferably. The invention has no special requirements for the source of the zinc powder, adopting the zinc powder as long as the technicians in this field get acquainted with it.
In the embodiment of the invention, select the higher contents of the sodium carbonate, the aluminum powder and the zinc powder within the limited amount range so as to achieve the purpose of corrosion prevention in the acid red soil region.
In the invention, the padding is alkalescent preferably, and furthermore the pH value is 9 preferably.
2016251185 03 Sep 2018
The invention has no special restrictions to the preparation method of the composite padding, adopting the technical solution for preparation of composite materials as long as the technicians in this field get acquainted with it. In the invention, the raw materials in the mass ratio of the above technical solution are blended evenly in dry environment.
In order to facilitate transport and selling of the composite padding, the composite padding prepared with the above technical solution in the invention is packaged to achieve the purpose of sealed storage and transport; the invention has no special requirements for the packing method, adopting the packing method as long as the technicians in this field get acquainted with it, specifically in barrel or bags in the embodiment of the invention.
The invention also provides the use of the composite padding prepared through the above technical solution; specifically, during site construction, the fresh water and the composite padding are blended to cover a ground connection material. In the invention, the composite padding and fresh water are blended into a viscous paste in a volume ratio of 2:1 preferably to cover a ground connection material, increasing the effective cross section of the ground connection body
The invention provides a ground connection and resistance reduction composite padding for acid red soil, which is prepared from a raw material comprising the following in mass ratio: 15-35% of conductive graphite, 30-60% of calcium bentonite, 15-35% of sodium bentonite, 2-5% of sodium carbonate, 1-3% of aluminum powder and 1-3% of zinc powder. The invention takes the applicable soil environment into full account. When the acidic materials in soil intrude into the resistance reduction composite padding, the system composed of sodium carbonate and bentonite has strong buffer effect on pH reduction so as to suppress acidic corrosion of soil; aluminum powder and zinc powder added improve the conductivity of the whole system; after the acidic materials and oxidizing substances in soil intrude and react with the aluminum powder and zinc powder, the acidic materials and oxidizing substances are consumed, aluminum and zinc are converted into conductible ions, so that the conductivity is still kept well.
Moreover, the ground connection and resistance reduction composite padding for acid red soil provided by the invention is alkalescent and able to reduce corrosion of acidic materials, with protective effect for metallic materials; the invention adopts the current conventional products and limits the particle size of components. The composite padding has the advantages of simple preparation and easy use, in favor of product popularization and application.
During site construction, the composite padding provided by the invention and fresh water are blended into a viscous paste to cover a ground connection material, increasing the effective cross section of the ground connection body; the composite padding and the ground connection body are
2016251185 03 Sep 2018 in tight contact on one hand, and on the other hand, the composite padding and peripheral soil are reliably bonded, basically eliminating the contact resistance. At the same time, the ground connection body does not generate contact resistance due to corrosion because of the corrosion proof function of the padding itself so as to achieve the purposes of resistance reduction and corrosion resistance.
The following describes the ground connection and resistance reduction composite padding for acid red soil and the use thereof provided by the invention in detail in combination with the embodiment, but they cannot be deemed as restrictions to the protection scope of the invention.
Embodiment 1
A ground connection and resistance reduction composite padding for acid red soil is prepared from a raw material comprising the following in mass ratio;
Conductive graphite: 26%;
Calcium bentonite: 55%;
Sodium bentonite: 15%;
Sodium carbonate: 2%;
Aluminum powder: 1%;
Zinc powder: 1%.
All components in the stated mass ratios are blended evenly in dry environment.
During site construction, the resistance reduction composite padding and fresh water are blended into a viscous paste in a volume ratio of 2:1 to cover a ground connection material.
Apply to the acid red soil region with less precipitation, and increase the content of calcium bentonite.
Embodiment 2:
A ground connection and resistance reduction composite padding for acid red soil is prepared from a raw material comprising the following in mass ratio;
Conductive graphite: 24%;
Calcium bentonite: 45%;
Sodium bentonite: 20%;
2016251185 03 Sep 2018
Sodium carbonate: 5%; Aluminum powder: 3%; Zinc powder: 3%.
All components in the stated mass ratios are blended evenly in dry environment.
During site construction, the resistance reduction composite padding and fresh water are blended into a viscous paste in a volume ratio of 2:1 to cover a ground connection material.
Apply to strong acid red soil region, and increase the contents of sodium carbonate, aluminum powder and zinc powder.
Weigh lOOg resistance reduction composite padding prepared in the embodiment 1, lOOg resistance reduction composite padding prepared in the embodiment 2 and lOOg acid red soil to absorb water to saturation state, then hold them at room temperature, and test the water contents with electronic moisture meter every other day, the test results are shown in Figure 1. It can be seen from Figure 1, the reduction of water contents of the reduction composite padding prepared in the embodiment 1 and the embodiment 2 is not obvious over time, while the water content of acid red soil decreases greatly.
Weigh lOOg resistance reduction composite padding prepared according to the embodiment 1, lOOg resistance reduction composite padding prepared according to the embodiment 2 and lOOg acid red soil to absorb water to saturation state, then hold them at room temperature for one month, after natural air drying and curing, make them into 3mm thick sheets respectively, test the resistivity with four-probe meter, the test results are shown in Figure 1.
Table 1. Resistivity of Different Padding
| Embodiment 1 | Embodiment 2 | Acid red soil |
| 1.52 Ω · m | 1.23 Ω · m | 150.56 Ω · m |
It can be known from Table 1, the resistance of the resistance reduction composite padding for acid red soil prepared according to the technical solution of the invention is lower than that of the
2016251185 03 Sep 2018 acid red soil obviously, with good conductivity.
The resistance reduction composite padding for acid red soil prepared according to embodiment 1 and embodiment 2 and acid red soil are used to cover different ground connection materials according to the conventional technological means in this field; after 12 months, test the corrosion mass loss rates of different ground connection materials, the test results are shown in Table 2.
Table 2. Corrosion mass loss rates of different ground connection materials after being covered with different padding for 12 months
| Type of ground connection materials | Corrosion mass loss rate (g/dm2 a) | ||
| Acid red soil | Embodiment 1 | Embodiment 2 | |
| Carbon steel sheet | 8.1532 | 1.1950 | 2.0229 |
| Galvanized steel | 4.6586 | 2.6830 | 2.3966 |
| Passivated steel | 2.2187 | 1.3903 | 0.9600 |
| New alloy steel | 2.6736 | 1.1391 | 1.0308 |
| Copper | 0.8383 | 0.4926 | 0.5144 |
| Copper coated steel | 0.8159 | 0.4247 | 0.3229 |
It can be known from the data in Table 2, after the same ground connection material is covered with acid red soil and resistance reduction composite padding for acid red soil prepared according to embodiment 1 and embodiment 2 for 12 months, the corrosion mass loss rates are different; the corrosion mass loss rate of the ground connection material covered with acid red soil directly is higher than that of the ground connection material covered with the resistance reduction composite padding prepared according to embodiment 1 or embodiment 2.
The description of the above embodiments is used to help users understand the method and core idea of the invention only. It shall point out that for common technicians in this technology field, on the premise of not breaking away from the principle of the invention, the invention can also be improved and modified, and these improvement and modifications are also in the protection range of the claims of the invention. The multiple modifications for these embodiments are obvious for
2016251185 03 Sep 2018 the professionals in this field. The general principle defined in this document can be achieved in other embodiments under the condition of not breaking away from the spirit or range of the invention. Therefore, the invention is not limited to these embodiments shown in this document, but shall meet the widest range consistent with the principles and new features disclosed in this document.
2016251185 03 Sep 2018
Claims (11)
- Claims1. A ground connection and resistance reduction composite padding for acid red soil, wherein the composite padding is prepared from a raw material comprising the following in mass ratio:Conductive graphite: 15-35%;Calcium bentonite: 30-60%;Sodium bentonite: 15-35%;Sodium carbonate: 2-5%;Aluminum powder: 1-3%;Zinc powder: 1-3%.
- 2. The composite padding according to claim 1, wherein the particle size of the calcium bentonite is no less than 200 mesh.
- 3. The composite padding according to claim 1 or 2, wherein the particle size of the sodium bentonite is no less than 200 mesh.
- 4. The composite padding according to any one of claims 1-3, wherein the particle size of the conductive graphite is no less than 100 mesh; that of the sodium carbonate is no less than 100 mesh; that of the aluminum powder is no less than 100 mesh; that of the zinc powder is no less than 100 mesh.
- 5. The composite padding according to any one of claims 1-4, wherein the mass ratio of the conductive graphite is 15-24%.
- 6. The composite padding according to any one of claims 1-5, wherein the mass ratio of the calcium bentonite is 30-45%.
- 7. The composite padding according to any one of claims 1-6, wherein the mass ratio of the sodium bentonite is 15-20%.
- 8. The composite padding according to any one of claims 1-7, wherein the mass ratio of the composite padding is alkalescent.
- 9. The composite padding according to claim 8, wherein the pH value of the composite padding is2016251185 03 Sep 20189.
- 10. The use of the composite padding according to any one of claims 1-9, wherein fresh water and the composite padding are blended to cover a ground connection material.
- 11. The use according to claim 10, wherein the composite padding and fresh water are blended in a volume ratio of 2:1.xSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSS?1/1Water content (%') ysxxx.»·-..•»»»»»»»S'*SX'‘>S»X>\\'-<»X->SSSS>SSS»SSSSX<-SS»S>SS'->\X-»SS»SX'-SSSSSSXX->SXX-SS<^.redaction ctsssporite paddia-gj in the ©ns bodimeiM 1 |-'^-Rej-jtsnce redaction composite padding) in the EiisfeoditasHt 2 | •^^“.Aiid rtdsoil 1 ^Xs-xafe. •’••y-xox..............^Ρ·Χχ.; W >»»»»X ^\x ^SxXXsXXv, ^SXXXxxxjjTime (day)Figure 1
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510195573.9A CN104810631A (en) | 2015-04-23 | 2015-04-23 | Ground connection resistance reduction composite padding for acid red soil |
| CN201510195573.9 | 2015-04-23 | ||
| PCT/CN2016/079727 WO2016169474A1 (en) | 2015-04-23 | 2016-04-20 | Ground connection and resistance reduction composite padding for acid red soil and use thereof |
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| AU2016251185A1 AU2016251185A1 (en) | 2017-04-06 |
| AU2016251185B2 true AU2016251185B2 (en) | 2018-09-27 |
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| AU2016251185A Active AU2016251185B2 (en) | 2015-04-23 | 2016-04-20 | Ground connection and resistance reduction composite padding for acid red soil and use thereof |
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| CN (1) | CN104810631A (en) |
| AU (1) | AU2016251185B2 (en) |
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| CN104810631A (en) * | 2015-04-23 | 2015-07-29 | 国家电网公司 | Ground connection resistance reduction composite padding for acid red soil |
| CN105390179A (en) * | 2015-10-28 | 2016-03-09 | 国网吉林省电力有限公司检修公司 | Resistance reduction mud and preparation method thereof |
| CN105957577B (en) * | 2016-05-05 | 2017-10-17 | 国网江西省电力科学研究院 | A kind of earthy calcium-base bentonite base friction reducer |
| CN111326272B (en) * | 2020-03-27 | 2021-04-13 | 河南四达电力设备股份有限公司 | Method for preparing slow-release graphite resistance-reducing paste |
| CN112676330A (en) * | 2020-12-28 | 2021-04-20 | 上海格林曼环境技术有限公司 | Filler for in-situ thermal desorption repair of heating well in polluted site and preparation method thereof |
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|---|---|---|---|---|
| CN1030666A (en) * | 1988-03-28 | 1989-01-25 | 傅辅成 | Inorganic-chemical solid reducer of ground resistance |
| CN104449560A (en) * | 2014-11-18 | 2015-03-25 | 国网河南省电力公司漯河供电公司 | Environment-friendly long-acting grounding device anticorrosive agent and preparation method of anticorrosive agent |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6050871A (en) * | 1983-08-31 | 1985-03-20 | 岡野 喜正 | Grounding resistance reducing agent |
| JPS6433861A (en) * | 1987-07-28 | 1989-02-03 | Denki Kagaku Kogyo Kk | Grounding resistance reducing agent |
| CN1068957C (en) * | 1998-09-30 | 2001-07-25 | 李黔鲁 | Grounding resistance depressant of rare earth for lightning protection |
| CN1209770C (en) * | 2002-08-01 | 2005-07-06 | 寇承平 | Physical grounding resistance reducing agent |
| CN101719393B (en) * | 2008-12-30 | 2012-01-04 | 中国瑞林工程技术有限公司 | Biological bacteria grounded resistance-reducing agent |
| CN101552385B (en) * | 2009-05-13 | 2010-12-29 | 北京林业大学 | Graphite aluminum-magnesium alloy grounding material and preparing method thereof |
| CN104810631A (en) * | 2015-04-23 | 2015-07-29 | 国家电网公司 | Ground connection resistance reduction composite padding for acid red soil |
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- 2015-04-23 CN CN201510195573.9A patent/CN104810631A/en active Pending
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- 2016-04-20 WO PCT/CN2016/079727 patent/WO2016169474A1/en active Application Filing
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1030666A (en) * | 1988-03-28 | 1989-01-25 | 傅辅成 | Inorganic-chemical solid reducer of ground resistance |
| CN104449560A (en) * | 2014-11-18 | 2015-03-25 | 国网河南省电力公司漯河供电公司 | Environment-friendly long-acting grounding device anticorrosive agent and preparation method of anticorrosive agent |
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| WO2016169474A1 (en) | 2016-10-27 |
| CN104810631A (en) | 2015-07-29 |
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