CN104529451A - Graphite lightning-protection grounding module and preparation method thereof - Google Patents
Graphite lightning-protection grounding module and preparation method thereof Download PDFInfo
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- CN104529451A CN104529451A CN201410782553.7A CN201410782553A CN104529451A CN 104529451 A CN104529451 A CN 104529451A CN 201410782553 A CN201410782553 A CN 201410782553A CN 104529451 A CN104529451 A CN 104529451A
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Abstract
The invention relates to the field of a lightning-protection grounding geographic pole and particularly relates to a graphite lightning-protection grounding module and a preparation method thereof. The graphite lightning-protection grounding module is made from graphite powder, granular graphite and asphalt. The preparation method comprises the steps of material preparing, kneading, blank preparing, roasting, post processing, and the like. The graphite lightning-protection grounding module disclosed by the invention is low in electrical resistivity, relatively high in mechanical strength, resistant to corrosion and long in service life.
Description
Technical field
The present invention relates to field, a kind of grounding for lightening earth polar, be specifically related to a kind of thunder-preventing graphite grounding module and preparation method thereof.
Background technology
Tradition ground connector mostly is metallic conductor, modally has round steel, angle steel, steel pipe, copper rod, copper mesh etc.Its shortcoming is that materials are many, and cost is large, life-span short, poor stability.Mostly matrix material earthing module is that by non-metallic conducting material be main body, and electric conductivity is low, stable performance.Do not degrade in placing into the soil, not containing corrosive ion, safety and environmental protection.But this earthing module ultimate compression strength is low, easily destroy in transportation and when installing.And range of application has limitation, can not be suitable for the working groundings such as some the precise instruments, radio and television equipment, electromedical equipment and protective ground and the grounding for lightening such as various Highrise buildings and tall and big structures, showplace ancient building, tall and big memorial tower.
Patent application 201410158454.1 discloses a kind of graphite earthing pole, is formed by expanded graphite 1000 parts, 140 ~ 170 parts, glass fibre and material 20 ~ 60 parts of braidings of improving earthing pole tensile strength and conductivity.
Patent application 201110440187.3 discloses a kind of graphite grounding module, comprise the graphite module bodies of being poured into a mould by electrically conductive graphite concrete, the metal rod iron be connected with this module bodies, electrically conductive graphite concrete material ratio of component by weight: 20 parts, water, silicate cement 30 ~ 40 parts, 5 ~ 15 parts, graphite, sandstone 10 ~ 15 parts, wetting Agent for Printing Inks 2 ~ 5 parts, wilkinite 10 ~ 25 parts, 5 ~ 10 parts, ionogen.By burying metallic framework in inside modules underground and improving existing electrically conductive graphite concrete, strengthen the intensity of graphite grounding module, to solve the problem manufacturing large volume Prefabricated block; The improvement of electrically conductive graphite concrete is that reducing content of graphite strengthens concrete strength, by adding a small amount of material which can retain moisture and ionogen to ensure its conductivity.
Patent application 201310375011.3 discloses a kind of composite graphite earth conductor, preparation method and using method, comprises corrosion resistant sleeve pipe, is filled with high-carbon graphite inner core in sleeve pipe, described sleeve pipe is distributed with one group of through hole.This application have employed the way of high-strength hot-dip zinc-coated pipe with holes or stainless steel tube with holes parcel expanded graphite core, and conduction has mainly been come by graphite core, but the phenomenon of metal armor oxidation and rusting can occur in this invention.
Due to the demand fulfillment stable performance of graphite earth polar, self-resistance rate is low, and has higher requirement to erosion resistance, and graphite earth polar of the prior art can not meet above-mentioned performance completely.Given this, special proposition the present invention.
Summary of the invention
Primary goal of the invention of the present invention is to propose a kind of thunder-preventing graphite grounding module.
In order to realize object of the present invention, the technical scheme of employing is:
The present invention proposes a kind of thunder-preventing graphite grounding module, the raw material of described thunder-preventing graphite grounding module is Graphite Powder 99, granular graphite and pitch, and its preparation method comprises the following steps:
(1) prepare burden: graphite is broken, screening obtains granular graphite and Graphite Powder 99, and mix according to mass ratio 5 ~ 7:3 ~ 5, the particle diameter of granular graphite is 0.8 ~ 1mm, and the particle diameter of Graphite Powder 99 is 0.075 ~ 0.5mm;
(2) kneading: the Graphite Powder 99 after step (1) being prepared burden and pitch are that 78 ~ 82:18 ~ 22 are carried out kneading and obtained plastic thickener according to mass ratio, and the time of kneading is 20 ~ 40 minutes, and the temperature of kneading is 130 ~ 145 DEG C; And carry out rolling sheet through flaking machine; (3) green compact are prepared: the sheet thickener that rolls step (2) obtained grinds to form 100 ~ 300 object powders, and it is 1.60 ~ 1.65g/cm that powder is pressed into density through vibratory compaction
3green compact;
(4) roasting: the High Temperature Furnaces Heating Apparatus that green compact are placed in, green compact stopping composition coke powder covers, and is progressively warming up to 950 DEG C ~ 1050 DEG C, obtains roasting product;
(5) post-treatment, obtains thunder-preventing graphite grounding module.
First optimal technical scheme of the present invention is: in step (1), and the ratio of granular graphite and Graphite Powder 99 is 3 ~ 4:6 ~ 7.
Second optimal technical scheme of the present invention is: in step (2), before kneading, is first vacuumized by pitch while heat, and the temperature of heating is 130 ~ 150 DEG C, vacuum tightness 500 ~ 5000Pa, preferably 500 ~ 2000Pa; Stir 10 ~ 30 minutes under this condition.
3rd optimal technical scheme of the present invention is: in step (2), and Graphite Powder 99 and pitch are 80 ~ 82:18 ~ 20 according to mass ratio; The time of kneading is 20 ~ 30 minutes, and the temperature of kneading is 130 ~ 140 DEG C.
4th optimal technical scheme of the present invention is: in step (2), and described pitch is medium temperature coal pitch, and the softening temperature of pitch is 85 ~ 95 DEG C.
5th optimal technical scheme of the present invention is: in step (3), rolls sheet thickener and wears into 200 ~ 300 object powders, preferably 200 orders; The frequency of vibratory compaction is 30 ~ 35Hz, and pressure is 12 ~ 15Mpa; Optimized frequency is 32 ~ 35Hz, and pressure is 12 ~ 14Mpa.
6th optimal technical scheme of the present invention is: in step (3), and the density of green compact is 1.62 ~ 1.65g/cm
3, preferably 1.62 ~ 1.64g/cm
3.
7th optimal technical scheme of the present invention is: in step (3), the green compact prepared have the shape of thunder-preventing graphite grounding module.
8th optimal technical scheme of the present invention is:, in step (4), heating curve is: 0 ~ 300 DEG C, heat-up rate is 8 ~ 12 DEG C/h, and 300 ~ 500 DEG C time, heat-up rate is 3 ~ 5 DEG C/h, 500 ~ 700 DEG C time, heat-up rate is 2 ~ 3 DEG C/h, and 700 ~ 1050 DEG C time, heat-up rate is 5 ~ 8.5 DEG C/h; Preferably 0 ~ 300 DEG C, heat-up rate is 9 ~ 11 DEG C/h, and 300 ~ 500 DEG C time, heat-up rate is 4 ~ 5 DEG C/h, and 500 ~ 700 DEG C time, heat-up rate is 2 ~ 3 DEG C/h, and 700 ~ 1050 DEG C time, heat-up rate is 6 ~ 8 DEG C/h.
The performance perameter of the thunder-preventing graphite grounding module that the present invention prepares is: density>=1.65g/cm
3, tensile strength 15 ~ 30Mpa, resistivity <0.01 Ω .m, rush current 1 ~ 5A, resistance change rate <1.2%, power current 8 ~ 10A, power frequency earthing resistance <1.2 Ω, annual corrosion rate <0.03%.
Below content of the present invention is made further explanation:
The present invention with graphous graphite powder, granular graphite and medium temperature coal pitch for raw material through kneading, roll the operation manufactures such as sheet, abrasive dust, compression molding, bakes to burn the article, mechanical workout and form.By raw material crushing and the particles of aggregates being sieved into specified size, fine powder worn into by a part of raw material, the compound of the various particle of mixing composition after weighing according to formula.In a heated state the compound of quantitative various particles and quantitative pitch are mixed, under certain hour and specified temp, are kneaded into plastic thickener.Carry out rolling sheet through flaking machine.The thickener rolling sheet is all worn into 200 object powders.Through moulding press at the green compact to become to have definite shape and higher density by powder pressing.Green compact are placed in custom-designed High Temperature Furnaces Heating Apparatus, and green compact stopping composition coke powder covers, and is progressively warming up to 950 DEG C ~ about 1050 DEG C, cakingagent is carbonized, thus obtains roasting product.Thus the physical and chemical performance obtained required for artificial regeneration graphite.According to service requirements, surperficial turning, end face processing are carried out to blank.The built-in galvanized metal pole piece of graphite grounding module and ground net ground wire compact siro spinning technology; the outstanding electric conductivity of synthetic graphite matrix module and excellent soil affinity, water-absorbent and water-retentivity in addition; reduce impedance between soil and earthing module, make destruction rush current be discharged into rapidly in the earth and then reach defencive function.Bury rear release ionogen underground, make the soil basic ion be in contact with it, the release current area of continuous increase ground connector own, lower earthing module and pedosphere Contact resistance, graphite matrix module itself have extremely strong water suction moisturizing and release electrolytical characteristic (these characteristics are that metallic substance is unexistent), and then play this earthing module outstanding resistance ability is fallen.
The invention discloses a kind of thunder-preventing graphite grounding module, raw material is Graphite Powder 99, granular graphite and medium temperature coal pitch, and the particle diameter of granular graphite is 0.8 ~ 1mm, and the particle diameter of Graphite Powder 99 is 0.075 ~ 0.5mm; The present invention has selected the graphite material of two kinds of particle diameters, thus accurately control density and the intensity of product, thus make closely more piling up of graphite, thus can make that the voidage of graphite material is low, the size of hole is little, and there is the advantage that intensity is high, antioxidant is strong.In kneading step of the present invention, be that 78 ~ 80:20 ~ 22 are carried out kneading and obtained thickener by the prepare burden Graphite Powder 99 that obtains and medium temperature coal pitch according to mass ratio.And preferably first medium temperature coal pitch is vacuumized while heat, the temperature of heating is 130 ~ 150 DEG C, vacuum tightness 500 ~ 5000Pa, preferably 500 ~ 200Pa; Stir 10 ~ 30 minutes under this condition.The present invention, thus can by the thorough volatilization of the lightweight fugitive constituent in medium temperature coal pitch by moderate vacuum environment, thus to avoid in roasting process due to gaseous volatilization thus form space in charcoal material.Because the space formed in volatile component volatilization process or bubble are very irregular, charcoal material can be made to form irregular, larger crack or cavity, reduce the mechanical property of finished product, the fraction defective of mould is increased.Meanwhile, the time of heating in the present invention is shorter, and the temperature of heating is lower, thus the mobility avoiding medium temperature coal pitch heating and cause declines.The present invention finds in practice process, and medium temperature coal pitch its mobility after comparatively high temps, the heating of longer time can reduce greatly, therefore needs to join in batches in aggregate and carries out kneading.And by pre-treatment way of the present invention, the mobility of medium temperature coal pitch is better, therefore, just can mix without the need to adding in batches.The medium vacuum condition that the present invention selects, not only can meet requirement of the present invention completely, and is industrially easy to realize, and is applicable to applying on a large scale.
Prepare in green compact step of the present invention, just like that the sheet thickener that rolls that obtains grinds to form 200 object powders, it is 1.60 ~ 1.65g/cm that powder is pressed into density through vibratory compaction
3green compact; And preferred 1.62g/cm
3.
In calcination steps of the present invention, green compact are placed in High Temperature Furnaces Heating Apparatus, green compact stopping composition coke powder covers, and is progressively warming up to 950 DEG C ~ 1050 DEG C and obtains roasting product.The present invention is directed to carbon tube and set special roasting heating curve, the heat-up rate of 0 ~ 300 DEG C is 8 ~ 12 DEG C/h, 300 ~ 500 DEG C time, heat-up rate is 4 ~ 5 DEG C/h, lightweight fugitive constituent in roasting product is discharged with the volatilization of slower speed, the suffered pressure of roasting product inside is less, comparatively balance, and avoid the generation of crackle in temperature-rise period, and light component has the sufficient time to discharge roasting product; 500 ~ 700 DEG C time, heat-up rate is 2 ~ 3 DEG C/h, is conducive to improving coking rate, and avoids roasting product in the process of polycondensation to crack when shrinking; 700 ~ 1050 DEG C time, heat-up rate is 6 ~ 8 DEG C/h.The weave construction of roasting product is reset, is adjusted, and densification further.Whole Baking profile makes product homogeneous and without internal fissure in heat-processed.
The finished product are obtained finally by finishing sequence.The performance perameter of the thunder-preventing graphite grounding module prepared is: density>=1.65g/cm
3, tensile strength 15 ~ 30Mpa, resistivity <0.01 Ω .m, rush current 1 ~ 5A, resistance change rate <1.2%, power current 8 ~ 10A, power frequency earthing resistance <1.2 Ω, annual corrosion rate <0.03%.The thunder-preventing graphite grounding module performance be prepared into of the present invention is stablized, and self-resistance rate is low, high-and low-temperature resistance, and acid-and base-resisting is corroded, and does not degrade in soil, long service life.
Beneficial effect of the present invention is:
1. graphite grounding module of the present invention can reduce stake resistance: of the present invention through synthetic graphite compacting, thermo forming, graphite-based composite material earthing module, naturality mineral are nontoxic, there is splendid soil affinity and water-absorbent, water-retentivity, splendid resistance reducing effect can be created.Use graphite grounding module as the earthing pole of ground net, the resistance reducing effect better than traditional type metallic ground pole can be obtained, approximately can increase by the resistance reducing effect of about 30%.
2. graphite grounding module of the present invention has powerful ultimate compression strength: ultimate compression strength can reach more than 25MPa, have more crush resistance, ground net applied be backfilling and compacted time, the complete of ground connector can be guaranteed, can not be broken or break easily because backfill extruding, so play the most efficiently, the most stable ground protection function; If earthing module is because of insufficient strength, very easily cause breaking or fragmentation of the rear body of backfill, will only be left the function of falling resistance like this, therefore the ability of leading off for large burst current can reduce.
3. graphite grounding module of the present invention has the work-ing life of overlength: graphite grounding module be in current commercially available prod work-ing life the longest.Be embedded in that the contact that underground can block air because of earth can not be oxidized, carbonization; and under the self-restraint of underground moisture content (except seawater); the carrying out that secondary reaction of hydration can continue, density can increase again, the increase that ultimate compression strength can continue; resistivity can reduce again; secondary hydration constantly can discharge ionogen, and the soil of periphery can continue to be ionized into alkalescence, constantly reduces the junction impedance between earthing module and soil; and then increase resistance reducing effect, and there is the effect of protection self.The main body of earthing module itself is corrosion resistant material, and the surface that its metallic framework adopts is through the metallic substance of corrosion-resistant treatments, and therefore the overall corrosion resistance of this ground connector is excellent, long service life.
4. graphite grounding module of the present invention can be increased economic efficiency: graphite grounding module low price, compared with same volume copper, only needs about 10% of copper processing, if consider work-ing life, gap is just larger.Copper ground-electrode is easily corroded, and when stake resistance rising needs to change ground net, spent resource is larger.It is little, lightweight, quick and easy for installation that earthing module of the present invention also has volume simultaneously, can improve site operation personnel ' s efficiency, significantly reduce construction cost.
5. graphite grounding module of the present invention can stability high: generally do not have a material of activity, after producing thermooxidizing through rush current tolerance test and power current tolerance test, its resistivity all can raise, and affects the stability of grounding resistance.But the graphite grounding module activated alkaline material that is tool, under having suff water to conserve, runs into the carrying out that thermal energy can accelerate secondary reaction of hydration, can increase density on the contrary, increase ultimate compression strength, so can reduce its resistivity once again.Test proves: graphite grounding module can the impact of withstand large power frequency and break current, and not by seasonal effect, resistance can protect long-term stability.
6. metal etc. not the active ground connector electrode of tool can discharge deleterious oxidation material and polluted underground water source after corrosion, not environmentally.Environment-friendly type graphite grounding module has activity, the ionogen discharged in secondary reaction of hydration process, hydration reaction is produced because having the active earth that can connect with it, be combined into the block with some strength, not only can increase earthing effect also can not polluted underground water source, and have long-lasting, very environmental protection.
7, the material of main part of earthing module and the physical structure of soil similar, can be combined as a whole with soil.Make the large manyfold of effective contact area rate metallic ground body of ground connector and soil, increase effective diffusing area of ground connector, greatly reduce the contact resistance of ground connector and soil, therefore can significantly improve ground connection efficiency, reduce earth mat land occupation area.
8, earthing module self has very strong moisture-absorbing moisture-keeping ability, makes the Soil conservation around it moistening, ensures that earthing module effectively plays electric action; Meanwhile, in ground connector, the conductive characteristic of conducting objects is not subject to the impact of the seasonal variation such as humidity, high/low temperature.Therefore stable stake resistance can be provided.
9, the graphite of the earthing module metal that makes resisitivity huge with form one between soil and change milder low resistance region, when heavy current impact, ground connector, grounding wire transient state potential gradient can be reduced, reduce step voltage and touch voltage, reduce the probability of spot potential counterattack.
The feature of graphite grounding module of the present invention is:
1, adopt pure graphite as the conducting medium of module, its electroconductibility is not by seasonal effect;
2, can moisture-absorbing moisture-keeping, can keep effectively contacting with soil, stake resistance is low;
3, in high soil resistivity, effectively ground network ground resistance can be reduced;
4, withstand large power frequency and rush current impact, resistance stabilization;
5, corrosion-resistant, nontoxic, long service life, simple installation.
Being applied as of graphite grounding module of the present invention:
1, working grounding, safety grounds and the grounding for lightening such as power station, substation, Nuclear power plants, hydropower station, wind power station, switching station, ultra-high-tension power transmission line, electric railway, telecommunications, mobile communication base station, microwave relay station, ground satellite receiving station, radar station.
2, working grounding and the protective ground such as the precise instrument, computer room equipment, post and telecommunications program-controlled equipment, radio and television equipment, electromedical equipment.
3, the grounding for lightening such as various Highrise buildings and tall and big structures, showplace ancient building, tall and big memorial tower.
4, petroleum transportation pipeline and oil gas tank, flammable and explosive substance warehouse grounding for lightening.
The specific embodiment of the present invention is only limitted to explain further and the present invention is described, does not limit Composition of contents of the present invention.
Embodiment
Embodiment 1
A kind of thunder-preventing graphite grounding module, raw material is Graphite Powder 99, granular graphite and pitch, and described pitch is medium temperature coal pitch, and the softening temperature of pitch is 85 ~ 95 DEG C.
Preparation method comprises the following steps:
1. prepare burden: Graphite Powder 99 is broken, screening obtains granular graphite and Graphite Powder 99, and mix according to mass ratio 5:5, the particle diameter of granular graphite is 0.8 ~ 1mm, and the particle diameter of Graphite Powder 99 is 0.075 ~ 0.5mm;
2. kneading: the Graphite Powder 99 after step 1 being prepared burden and pitch are that 78:22 carries out kneading and obtains plastic thickener according to mass ratio, and the time of kneading is 20 minutes, and the temperature of kneading is 145 DEG C; And carry out rolling sheet through flaking machine;
3. prepare green compact: the sheet thickener that rolls step 2 obtained grinds to form 200 object powders, powder is pressed into through vibratory compaction there is definite shape, density is 1.60g/cm
3green compact; The frequency of vibratory compaction is 33Hz, and pressure is 14Mpa;
4. roasting: the High Temperature Furnaces Heating Apparatus that green compact are placed in, green compact stopping composition coke powder covers, and is progressively warming up to 950 DEG C ~ 1050 DEG C, obtains roasting product; Heating curve is: 0 ~ 300 DEG C, and heat-up rate is 9 DEG C/h, and 300 ~ 500 DEG C time, heat-up rate is 5 DEG C/h, and 500 ~ 700 DEG C time, heat-up rate is 3 DEG C/h, and 700 ~ 950 DEG C time, heat-up rate is 8 DEG C/h;
5., according to service requirements, surperficial turning, end face processing are carried out to blank, obtains thunder-preventing graphite grounding module.
The performance perameter of the thunder-preventing graphite grounding module prepared: density>=1.65g/cm
3, tensile strength 16Mpa, resistivity <0.05 Ω .m, rush current 1A, resistance change rate 1.2%, power current 10A, power frequency earthing resistance <1.2 Ω, annual corrosion rate <0.03%.
Embodiment 2
A kind of thunder-preventing graphite grounding module, raw material is Graphite Powder 99, granular graphite and pitch, and described pitch is medium temperature coal pitch, and the softening temperature of pitch is 85 ~ 95 DEG C.
Preparation method comprises the following steps:
1. prepare burden: Graphite Powder 99 is broken, screening obtains granular graphite and Graphite Powder 99, and mix according to mass ratio 3:7, the particle diameter of granular graphite is 0.8 ~ 1mm, and the particle diameter of Graphite Powder 99 is 0.075 ~ 0.5mm;
2. kneading: be that 80:20 carries out kneading and obtains plastic thickener according to mass ratio by the Graphite Powder 99 after batching and pitch, the time of kneading is 30 minutes, and the temperature of kneading is 140 DEG C; And carry out rolling sheet through flaking machine; Before kneading, first vacuumized by pitch while heat, the temperature of heating is 140 DEG C, vacuum tightness 2000Pa; Stir 10 ~ 30 minutes under this condition;
3. prepare green compact: the sheet thickener that rolls obtained is ground to form 200 object powders, powder is pressed into through vibratory compaction there is definite shape, density is 1.62g/cm
3green compact; The frequency of vibratory compaction is 35Hz, and pressure is 15Mpa;
4. roasting: the High Temperature Furnaces Heating Apparatus that green compact are placed in, green compact stopping composition coke powder covers, and is progressively warming up to 950 DEG C ~ 1050 DEG C, obtains roasting product; Heating curve is: at 0 ~ 300 DEG C, and heat-up rate is 10 DEG C/h, and 300 ~ 500 DEG C time, heat-up rate is 4 ~ 5 DEG C/h, and 500 ~ 700 DEG C time, heat-up rate is 2 ~ 3 DEG C/h, and 700 ~ 950 DEG C time, heat-up rate is 6 ~ 8 DEG C/h.
5., according to service requirements, surperficial turning, end face processing are carried out to blank, obtains thunder-preventing graphite grounding module.
The performance perameter of the thunder-preventing graphite grounding module prepared: density>=1.65g/cm
3, tensile strength 25Mpa, resistivity <0.01 Ω .m, rush current 5A, resistance change rate 1.2%, power current 10A, power frequency earthing resistance <1.2 Ω, annual corrosion rate <0.03%.
Embodiment 3
A kind of thunder-preventing graphite grounding module, raw material is Graphite Powder 99, granular graphite and pitch, and described pitch is medium temperature coal pitch, and the softening temperature of pitch is 85 ~ 95 DEG C.
Preparation method comprises the following steps:
1. prepare burden: Graphite Powder 99 is broken, screening obtains granular graphite and Graphite Powder 99, and mix according to mass ratio 4:6, the particle diameter of granular graphite is 0.8 ~ 1mm, and the particle diameter of Graphite Powder 99 is 0.075 ~ 0.5mm;
2. kneading: be that 78:22 carries out kneading and obtains plastic thickener according to mass ratio by the graphite after batching and pitch, the time of kneading is 30 minutes, and the temperature of kneading is 145 DEG C; And carry out rolling sheet through flaking machine; Before kneading, first vacuumized by pitch while heat, the temperature of heating is 145 DEG C, and vacuum tightness 1000Pa, stirs 10 ~ 30 minutes under this condition;
3. prepare green compact: the sheet thickener that rolls obtained is ground to form 200 object powders, powder is pressed into through vibratory compaction there is definite shape, density is 1.62g/cm
3green compact; The frequency of vibratory compaction is 33Hz, and pressure is 14Mpa;
4. roasting: the High Temperature Furnaces Heating Apparatus that green compact are placed in, green compact stopping composition coke powder covers, and is progressively warming up to 950 DEG C, obtains roasting product; Heating curve is: at 0 ~ 300 DEG C, and heat-up rate is 11 DEG C/h, and 300 ~ 500 DEG C time, heat-up rate is 4 DEG C/h, and 500 ~ 700 DEG C time, heat-up rate is 2.5 DEG C/h, and 700 ~ 950 DEG C time, heat-up rate is 7 DEG C/h
(5) according to service requirements, surperficial turning, end face processing are carried out to blank, obtains thunder-preventing graphite grounding module.
The performance perameter of the thunder-preventing graphite grounding module prepared: density>=1.65g/cm
3, tensile strength 20Mpa, resistivity <0.02 Ω .m, rush current 3A, resistance change rate 1.2%, power current 10A, power frequency earthing resistance <1.2 Ω, annual corrosion rate <0.03%.
Experimental example 1:
Comparative example 1: prepare thunder-preventing graphite grounding module according to the method for embodiment 2, difference is, in step (1), all adopts particle diameter to be the granular graphite of 0.5 ~ 1mm;
Comparative example 2: prepare thunder-preventing graphite grounding module according to the method for embodiment 2, difference is, in step (1), all adopts particle diameter to be the granular graphite of 0.1 ~ 1mm;
Comparative example 3: prepare thunder-preventing graphite grounding module according to the method for embodiment 2, difference is, in step (1), adopting particle diameter to be the granular graphite of 0.5 ~ 0.8mm and particle diameter is the Graphite Powder 99 of 0.075 ~ 0.5mm;
Comparative example 4: prepare thunder-preventing graphite grounding module according to the method for embodiment 2, difference is, in step (1), adopting particle diameter to be the granular graphite of 0.8 ~ 1mm and particle diameter is the Graphite Powder 99 of 0.01 ~ 0.5mm;
Comparative example 5: prepare thunder-preventing graphite grounding module according to the method for embodiment 2, difference is, in step (1), adopting particle diameter to be the granular graphite of 0.8 ~ 1mm and particle diameter is the Graphite Powder 99 of 0.075 ~ 0.1mm;
The performance perameter of the thunder-preventing graphite grounding module prepared is as shown in table 1:
Table 1:
Experimental example 2:
Comparative example 6: prepare thunder-preventing graphite grounding module according to the method for embodiment 2, difference is, in step (3), grinds to form 100 object powders by the sheet thickener that rolls obtained,
Comparative example 7: prepare thunder-preventing graphite grounding module according to the method for embodiment 2, difference is, in step (3), grinds to form 150 object powders by the sheet thickener that rolls obtained,
Comparative example 8: prepare thunder-preventing graphite grounding module according to the method for embodiment 2, difference is, in step (3), grinds to form 300 object powders by the sheet thickener that rolls obtained,
The performance perameter of the thunder-preventing graphite grounding module prepared is as shown in table 2:
Table 2:
Experimental example 3:
Comparative example 9: prepare thunder-preventing graphite grounding module according to the method for embodiment 2, difference is, in step (4), heating curve is: 0 ~ 1050 DEG C, and heat-up rate is 10 DEG C/h;
Comparative example 10: prepare thunder-preventing graphite grounding module according to the method for embodiment 2, difference is, in step (4), heating curve is: 0 ~ 1050 DEG C, and heat-up rate is 5 DEG C/h;
Comparative example 11: prepare thunder-preventing graphite grounding module according to the method for embodiment 2, difference is, in step (4), heating curve is: 0 ~ 1050 DEG C, and heat-up rate is 2 DEG C/h;
Comparative example 12: prepare thunder-preventing graphite grounding module according to the method for embodiment 2, difference is, in step (4), heating curve is: 0 ~ 300 DEG C, and heat-up rate is 10 DEG C/h, 300 ~ 500 DEG C time, heat-up rate is 2 DEG C/h, and 500 ~ 700 DEG C time, heat-up rate is 1 DEG C/h, 700 ~ 1050 DEG C time, heat-up rate is 5 DEG C/h;
Comparative example 13: prepare thunder-preventing graphite grounding module according to the method for embodiment 2, difference is, in step (4), heating curve is: 0 ~ 300 DEG C, and heat-up rate is 10 DEG C/h, 300 ~ 500 DEG C time, heat-up rate is 8 DEG C/h, and 500 ~ 700 DEG C time, heat-up rate is 5 DEG C/h, 700 ~ 1050 DEG C time, heat-up rate is 10 DEG C/h;
Comparative example 14: prepare thunder-preventing graphite grounding module according to the method for embodiment 2, difference is, in step (4), heating curve is: 0 ~ 300 DEG C, and heat-up rate is 10 DEG C/h, 300 ~ 500 DEG C time, heat-up rate is 1 DEG C/h, and 500 ~ 700 DEG C time, heat-up rate is 1 DEG C/h, 700 ~ 1050 DEG C time, heat-up rate is 8 DEG C/h;
Table 2:
Claims (10)
1. a thunder-preventing graphite grounding module, is characterized in that, the raw material of described thunder-preventing graphite grounding module is Graphite Powder 99, granular graphite and pitch, and its preparation method comprises the following steps:
(1) prepare burden: graphite is broken, screening obtains granular graphite and Graphite Powder 99, and mix according to mass ratio 5 ~ 7:3 ~ 5, the particle diameter of granular graphite is 0.8 ~ 1mm, and the particle diameter of Graphite Powder 99 is 0.075 ~ 0.5mm;
(2) kneading: the Graphite Powder 99 after step (1) being prepared burden and pitch are that 78 ~ 82:18 ~ 22 are carried out kneading and obtained plastic thickener according to mass ratio, and the time of kneading is 20 ~ 40 minutes, and the temperature of kneading is 130 ~ 145 DEG C; And carry out rolling sheet through flaking machine;
(3) green compact are prepared: the sheet thickener that rolls step (2) obtained grinds to form 100 ~ 300 object powders, and it is 1.60 ~ 1.65g/cm that powder is pressed into density through vibratory compaction
3green compact;
(4) roasting: the High Temperature Furnaces Heating Apparatus that green compact are placed in, green compact stopping composition coke powder covers, and is progressively warming up to 950 DEG C ~ 1050 DEG C, obtains roasting product;
(5) post-treatment, obtains thunder-preventing graphite grounding module.
2. thunder-preventing graphite grounding module according to claim 1, is characterized in that, in step (1), the ratio of granular graphite and Graphite Powder 99 is 3 ~ 4:6 ~ 7.
3. thunder-preventing graphite grounding module according to claim 1, is characterized in that, in step (2), before kneading, first vacuumized by pitch while heat, the temperature of heating is 130 ~ 150 DEG C, vacuum tightness 500 ~ 5000Pa, preferably 500 ~ 2000Pa; Stir 10 ~ 30 minutes under this condition.
4. thunder-preventing graphite grounding module according to claim 1, is characterized in that, in step (2), Graphite Powder 99 and pitch are 80 ~ 82:18 ~ 20 according to mass ratio; The time of kneading is 20 ~ 30 minutes, and the temperature of kneading is 130 ~ 140 DEG C.
5. thunder-preventing graphite grounding module according to claim 1, is characterized in that, in step (2), described pitch is medium temperature coal pitch, and the softening temperature of pitch is 85 ~ 95 DEG C.
6. thunder-preventing graphite grounding module according to claim 1, is characterized in that, in step (3), rolls sheet thickener and wears into 200 ~ 300 object powders, preferably 200 orders; The frequency of vibratory compaction is 30 ~ 35Hz, and pressure is 12 ~ 15Mpa; Optimized frequency is 32 ~ 35Hz, and pressure is 12 ~ 14Mpa.
7. thunder-preventing graphite grounding module according to claim 1, is characterized in that, in step (3), the density of green compact is 1.62 ~ 1.65g/cm
3, preferably 1.62 ~ 1.64g/cm
3.
8. thunder-preventing graphite grounding module according to claim 1, is characterized in that, in step (3), the green compact prepared have the shape of thunder-preventing graphite grounding module.
9. thunder-preventing graphite grounding module according to claim 1, it is characterized in that, in step (4), heating curve is: 0 ~ 300 DEG C, and heat-up rate is 8 ~ 12 DEG C/h, 300 ~ 500 DEG C time, heat-up rate is 3 ~ 5 DEG C/h, and 500 ~ 700 DEG C time, heat-up rate is 2 ~ 3 DEG C/h, 700 ~ 1050 DEG C time, heat-up rate is 5 ~ 8.5 DEG C/h; Preferably 0 ~ 300 DEG C of heat-up rate is 9 ~ 11 DEG C/h, and 300 ~ 500 DEG C time, heat-up rate is 4 ~ 5 DEG C/h, and 500 ~ 700 DEG C time, heat-up rate is 2 ~ 3 DEG C/h, and 700 ~ 1050 DEG C time, heat-up rate is 6 ~ 8 DEG C/h.
10. thunder-preventing graphite grounding module according to claim 1, is characterized in that, the performance perameter of the thunder-preventing graphite grounding module prepared: density>=1.65g/cm
3, tensile strength 15 ~ 30Mpa, resistivity <0.01 Ω .m, rush current 1 ~ 5A, resistance change rate <1.2%, power current 8 ~ 10A, power frequency earthing resistance <1.2 Ω, annual corrosion rate <0.03%.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105255191A (en) * | 2015-10-21 | 2016-01-20 | 国家电网公司 | Grounding module modified through carbon nano tubes and preparation method of grounding module |
| CN108075248A (en) * | 2016-11-18 | 2018-05-25 | 国网河南省电力公司安阳供电公司 | A kind of thunder-preventing graphite grounding module and preparation method thereof |
| CN108123232A (en) * | 2016-11-29 | 2018-06-05 | 国网河南省电力公司安阳供电公司 | It is a kind of that there is conductive anticorrosive grounding body and preparation method thereof |
| CN109349277A (en) * | 2018-10-08 | 2019-02-19 | 湖北捷地安电气有限公司 | A kind of environmental protection rush vegetation growth type grounding resistance-reducing material |
| CN109503168A (en) * | 2018-10-08 | 2019-03-22 | 湖北捷地安电气有限公司 | A kind of efficient discharge earthing module |
| CN110137704A (en) * | 2019-05-30 | 2019-08-16 | 武汉明心电力科技有限公司 | A kind of novel power transmission overhead line structures earthing pole material |
| CN111092368A (en) * | 2019-12-31 | 2020-05-01 | 山西捷力通防雷科技有限公司 | Preparation and installation process of graphene composite lightning rod |
Citations (1)
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|---|---|---|---|---|
| CN102082331A (en) * | 2011-02-25 | 2011-06-01 | 大庆奉天电力器材厂 | Carbonized grounding electrode and preparation method thereof |
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Patent Citations (1)
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| CN102082331A (en) * | 2011-02-25 | 2011-06-01 | 大庆奉天电力器材厂 | Carbonized grounding electrode and preparation method thereof |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105255191A (en) * | 2015-10-21 | 2016-01-20 | 国家电网公司 | Grounding module modified through carbon nano tubes and preparation method of grounding module |
| CN108075248A (en) * | 2016-11-18 | 2018-05-25 | 国网河南省电力公司安阳供电公司 | A kind of thunder-preventing graphite grounding module and preparation method thereof |
| CN108123232A (en) * | 2016-11-29 | 2018-06-05 | 国网河南省电力公司安阳供电公司 | It is a kind of that there is conductive anticorrosive grounding body and preparation method thereof |
| CN108123232B (en) * | 2016-11-29 | 2020-04-21 | 国网河南省电力公司安阳供电公司 | Grounding body with conductive and corrosion-resistant functions and preparation method thereof |
| CN109349277A (en) * | 2018-10-08 | 2019-02-19 | 湖北捷地安电气有限公司 | A kind of environmental protection rush vegetation growth type grounding resistance-reducing material |
| CN109503168A (en) * | 2018-10-08 | 2019-03-22 | 湖北捷地安电气有限公司 | A kind of efficient discharge earthing module |
| CN110137704A (en) * | 2019-05-30 | 2019-08-16 | 武汉明心电力科技有限公司 | A kind of novel power transmission overhead line structures earthing pole material |
| CN111092368A (en) * | 2019-12-31 | 2020-05-01 | 山西捷力通防雷科技有限公司 | Preparation and installation process of graphene composite lightning rod |
| CN111092368B (en) * | 2019-12-31 | 2021-04-30 | 山西捷力通防雷科技有限公司 | Preparation and installation process of graphene composite lightning rod |
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