CN103454540B - A kind of porcelain insulator artificial acceleration electrical ageing test method - Google Patents
A kind of porcelain insulator artificial acceleration electrical ageing test method Download PDFInfo
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- CN103454540B CN103454540B CN201310425459.1A CN201310425459A CN103454540B CN 103454540 B CN103454540 B CN 103454540B CN 201310425459 A CN201310425459 A CN 201310425459A CN 103454540 B CN103454540 B CN 103454540B
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Abstract
The present invention relates to a kind of porcelain insulator artificial acceleration electrical ageing test method, crystalline flake graphite and liquid glue are mixed with graphite mixture, coat this graphite mixture on the surface of porcelain insulator full skirt one end and form latticed graphite linings, form multiple blocky graphite electrode, the clearance channel between adjacent block graphite electrode is that high resistant does district; Then in the middle part of this end face, high-field electrode is arranged, in this end surface side along arranging ground-electrode; High-field electrode and ground-electrode access in high-potting loop respectively, by regulating the voltage in high-potting loop, do district at the high resistant of porcelain insulator full skirt surface graphite linings and form continual and steady electric arc, the lasting calcination of electric arc makes porcelain insulator full skirt surface glaze layer generation galvanic corrosion damage.Test unit required for the present invention is simple, easy to operate, fast and effeciently can make porcelain insulator generation voltage ageing, shortens the test period.
Description
Technical field
The present invention relates to porcelain insulator field, especially relate to a kind of porcelain insulator artificial acceleration electrical ageing test method.
Background technology
Insulator is requisite components and parts in power transmission and transforming equipment, plays the vital role that electric insulation and machinery are fixing.Porcelain insulator is most popular insulator in electric system, in its operational process, the impact of strong electromagnetic environment, exterior mechanical load and ambient climate environment can be subject to, along with working time increases, these external factor and the effect of porcelain insulator internal soundness combined factors, can impel porcelain insulator to occur aging.
The aging main manifestations of porcelain insulator is two aspects, one be its electrical insulation properties gradually deterioration even completely lose, two is that its physical strength declines gradually and even ruptures, and both all may cause serious electrical hazard.In operational process, the leakage current under filthy wet condition and the flashover arc caused that is struck by lightning can cause porcelain insulator full skirt surface that galvanic corrosion damage occurs, and destroy its surface glaze layer, cause insulating property to reduce; Meanwhile, stress can be produced after glaze damage layer and concentrate, cause porcelain insulator physical strength to decline.
The unaccelerated aging of porcelain insulator is a long process, and generally after 20 years of operation, its ageing rate just increases gradually, therefore, is necessary to adopt artificial accelerated aging test to study its aging characteristics.At present, the insulating material artificial accelerated aging test method of IEC standard and China's national Specification mainly comprises the multifactor aging test method of inclined plane method, 1000h saline fog method, squirrel wheel method and 5000h, the testing equipment that these methods require is complicated, and the time cycle is longer, need the many factors controlled.In addition, said method is also mainly used in the artificial accelerated aging test of composite insulator, does not almost apply in the accelerated deterioration of porcelain insulator.Therefore, the artificial accelerated aging test method that proposition is a kind of fast effectively, be applicable to porcelain insulator is necessary.
Summary of the invention
Given this, the object of the invention is to, a kind of porcelain insulator artificial acceleration electrical ageing test method is provided, damage for fast and effeciently making porcelain insulator full skirt surface glaze layer generation galvanic corrosion, for the aging characteristics studying porcelain insulator further provide test product, short form test device, shortens the test product manufacturing cycle.
For solving the problems of the technologies described above, the technical solution used in the present invention is:
A kind of porcelain insulator artificial acceleration electrical ageing test method, it is characterized in that, crystalline flake graphite and liquid glue are mixed with graphite mixture, coat this graphite mixture on the surface of porcelain insulator full skirt one end and form latticed graphite linings, form multiple blocky graphite electrode, the clearance channel between adjacent block graphite electrode is that high resistant does district; Then in the middle part of this end face, high-field electrode is arranged, in this end surface side along arranging ground-electrode; High-field electrode and ground-electrode access in high-potting loop respectively, by regulating the voltage in high-potting loop, do district at the high resistant of porcelain insulator full skirt surface graphite linings and form continual and steady electric arc, the lasting calcination of electric arc makes porcelain insulator full skirt surface glaze layer generation galvanic corrosion damage.
In a kind of above-mentioned porcelain insulator artificial acceleration electrical ageing test method, the concrete steps of the method are as follows:
Step 1, latticed brushing mould is covered porcelain insulator full skirt surface, and by graphite mixture brushing in the grid of brushing mould, after taking off brushing mould, porcelain insulator full skirt surface just forms multiple blocky graphite electrode, and the clearance channel between adjacent block graphite electrode is that high resistant does district;
Step 2, high-field electrode is arranged in the middle part of the end face of porcelain insulator full skirt scribbling graphite, ground-electrode is arranged on the end surface side edge of the porcelain insulator full skirt scribbling graphite, high-field electrode is connected to the high-voltage output end in high-potting loop, and ground-electrode is connected to grounded screen by series connection leakage current collection system;
Step 3, after guaranteeing that test connection is errorless, the graphite linings gap starting the arc on porcelain insulator full skirt surface is boosted to by high-potting loop modulation, maintain this voltage levvl, namely electric arc continued stable combustion can be kept, the glaze layer generation galvanic corrosion of porcelain insulator full skirt surface pilot region is damaged, can either judge whether arc burning is stablized by the leakage current real-time waveform collected.
In a kind of above-mentioned porcelain insulator artificial acceleration electrical ageing test method, described porcelain insulator comprises the suspended porcelain insulator for transmission line of electricity and the pillar porcelain insulator for transformer station.
In a kind of above-mentioned porcelain insulator artificial acceleration electrical ageing test method, described graphite linings is that crystalline flake graphite and liquid glue are prepared and the potpourri stirred by the quality proportioning of 1:1 ~ 1:2.
In a kind of above-mentioned porcelain insulator artificial acceleration electrical ageing test method, described high-field electrode and ground-electrode are bare copper wire, for suspended porcelain insulator, be wound around one enclose bare copper wire as high-field electrode at its chapeau de fer and porcelain body junction; For pillar porcelain insulator, be wound around a circle bare copper wire as high-field electrode at its full skirt root porcelain knob; Ground-electrode adopts High temperature-resistanadhesive adhesive tape to be fixed on full skirt edge.
In a kind of above-mentioned porcelain insulator artificial acceleration electrical ageing test method, described high-potting loop comprises the power switch S, the pressure regulator T that connect power supply
1, HT testing transformer T
2, current-limiting resistance R, RC divider D and leakage current collection system, described leakage current collection system comprises leakage current sampling resistor R
a, data collecting card A, computing machine C, described pressure regulator T
1with HT testing transformer T
2input power frequency be 48Hz ~ 62Hz; Described power switch S two termination pressure regulator T
1input end, described pressure regulator T
1output termination HT testing transformer T
2input end, described HT testing transformer T
2high-voltage output end connect the high-pressure side of RC divider D through current-limiting resistance R and be arranged in high-field electrode on porcelain insulator P, the ground-electrode of described porcelain insulator P is by series connection leakage current sampling resistor R
awith HT testing transformer T
2grounded screen is connected to, described leakage current sampling resistor R together with the earth terminal of RC divider D
athe input end of output termination data collecting card A, the USB interface of the output terminate computer C of described data collecting card A.
In a kind of above-mentioned porcelain insulator artificial acceleration electrical ageing test method, described brushing mould is a latticed fanning strip, in described fanning strip, grid is hollow out grid, and the radius of fanning strip is less than the radius of the full skirt end face of porcelain insulator, and fan-shaped central angle is less than 360 ° for being greater than 0 °; Thickness is 0.5mm ~ 2mm.
The advantage that the present invention has and positive effect are: owing to have employed technique scheme, continual and steady electric arc can be formed on porcelain insulator full skirt surface, by controlling the arc time, the galvanic corrosion that porcelain insulator full skirt surface glaze layer can be made to occur in various degree is damaged, and fast and effeciently can realize porcelain insulator artificial acceleration voltage ageing; Meanwhile, the test unit needed for porcelain insulator artificial acceleration electrical ageing test method of the present invention is simple, easy to operate, and greatly can shorten the test period.
Accompanying drawing explanation
Accompanying drawing 1 is the high-potting circuit wiring diagram in the present invention.
Accompanying drawing 2 is the graphite linings brushing moulds in the present invention.
Accompanying drawing 3 is the high-field electrode of the embodiment of the present invention, ground electrode arrangement mode and graphite linings brushing design sketch.
Embodiment
Below by embodiment, and by reference to the accompanying drawings, technical scheme of the present invention is described in further detail.Wherein, S: power switch, T
1: pressure regulator, T
2: HT testing transformer, R: current-limiting resistance, D: RC divider, P: pillar porcelain insulator test product, R
a: leakage current sampling resistor, A: data collecting card, C: computing machine, 1: hollow out grid, 2: clearance channel, 3: pillar porcelain insulator, 4: tested full skirt, 5: high-field electrode, 6: ground-electrode, 7: graphite linings.
In the present embodiment, using ZSW-40.5/10K-4 t shore porcelain insulator as subjects, as shown in Figure 1, high-potting loop of the present invention is by power switch S, pressure regulator T
1, HT testing transformer T
2, current-limiting resistance R, RC divider D and leakage current collection system composition, wherein, supply frequency is 50Hz, voltage is 380V, pressure regulator is the TCWJH series variable ratio pressure regulator that Wuhan Hua electricity Mei Lun power technology company limited produces, and carry overcurrent relay, HT testing transformer is the YDJ(G that Wuhan Hua electricity Mei Lun power technology company limited produces) serial light-duty AC high-voltage test transformer, current-limiting resistance is water resistance, and leakage current collection system is by accurate noninductive resistance R
a, data collecting card A and computer software platform C forms, direct extraction method is adopted to gather leakage current, seal in accurate noninductive resistance in the loop, when pillar porcelain insulator full skirt surface produces electric arc, electric current flows through measuring circuit, leakage current is converted to resistance both end voltage to measure, sample circuit module adopts CATV shielding box to carry out shielding to reduce the impact of external interference on signal, computing machine is used for arranging capture card and the operation such as data preservation, LabVIEW is utilized to programme, omnidistancely can measure leakage current and voltage, and data and waveform can be preserved, leakage current collection system acquisition to data be the magnitude of voltage at accurate noninductive resistance two ends, leakage current data is divided by noninductive resistance resistance.
As shown in Figure 2, the graphite linings brushing mould adopted in the present embodiment to be a central angle the be fan-shaped cardboard of 60 °, thickness is 1mm, multiple rhombus hollow out grid is made on its surface, make it have certain dutycycle, clearance channel width between adjacent mesh is 3mm, at the trial as discharge channel.
As shown in Figure 3, the arrangement of high-field electrode and ground-electrode is as follows: be wound around a circle bare copper wire as high-field electrode at tested full skirt upper surface umbrella root porcelain knob, adopt High temperature-resistanadhesive adhesive tape to fix one section of bare copper wire as ground-electrode at tested full skirt edge.High-field electrode is connected to the high-voltage output end in high-potting loop, and ground-electrode is connected to grounded screen by series connection leakage current collection system.
The graphite adopted in the present embodiment is the high-purity crystalline flake graphite that Henan Xixia Mine graphite factory produces, its particle diameter≤0.3mm, and carbon content is greater than 99%, and the liquid glue of employing is 7302 liquid glues that the capable Group Co., Ltd in Zhejiang produces.Graphite linings employing crystalline flake graphite and liquid glue according to a certain ratio mixed preparing form, and its quality proportioning is generally decided to be 1:1.2, and graphite is relevant with porcelain insulator full skirt pilot region size with glue quantity.In the present embodiment, adopt precision balance to take 5g crystalline flake graphite and 6g liquid glue, it is mixed mutually, and adopts stirring rod to stir, be mixed with potpourri.
The painting process of graphite linings is as follows: fitted tightly by brushing mould on full skirt surface, adopts adhesive tape to be fixed on full skirt by its four angles, ensures that in painting process, mould slippage does not occur; Adopt writing brush to dip the graphite linings prepared, among the grid being single-frame filled in mould, make graphite linings consumption be evenly distributed as far as possible, and do not allow graphite linings stick in die surface; After brushing, tear the adhesive tape of mould four end, open mould carefully along full skirt vertical direction, guarantee that mould does not go out graphite linings in large area area, because the glue in graphite linings has viscosity, mould has a small amount of remaining be inevitable; After opening mould, then adopt little writing brush slightly to modify graphite linings, make it neat and artistic.
After graphite linings brushing, according to Fig. 1 joint test loop, after guaranteeing that test connection is errorless, slowly boosted to the graphite linings gap starting the arc on pillar porcelain insulator full skirt surface by pressure regulator, maintain this voltage levvl, electric arc continued stable combustion can be kept, by LabVIEW software platform real-time monitored leakage current values in process of the test, if leakage current values is excessive, then appropriateness reduces trial voltage, ensures not cause transformer overcurrent protection to trip; If leakage current values is very little, appropriateness can improves trial voltage, increase arc energy.Because porcelain insulator full skirt surface graphite linings exists multiple clearance channel, electric arc can produce in multiple gap simultaneously, along with the arc time extends, also can there is continuous change in burning position, thus the galvanic corrosion of the glaze layer occurrence of large-area of porcelain insulator full skirt surface pilot region is damaged.By controlling arc time length, the porcelain insulator test product of different galvanic corrosion degree can be drawn.
Specific embodiment described above is only to the explanation for example of the present invention's spirit.Those skilled in the art can make various amendment or supplement or adopt similar mode to substitute to described specific embodiment, but can't depart from spirit of the present invention or surmount the scope that appended claims defines.
Claims (7)
1. a porcelain insulator artificial acceleration electrical ageing test method, it is characterized in that, crystalline flake graphite and liquid glue are mixed with graphite mixture, coat this graphite mixture on the surface of porcelain insulator full skirt one end and form latticed graphite linings, form multiple blocky graphite electrode, the clearance channel between adjacent block graphite electrode is that high resistant does district; Then in the middle part of this end face, high-field electrode is arranged, in this end surface side along arranging ground-electrode; High-field electrode and ground-electrode access in high-potting loop respectively, by regulating the voltage in high-potting loop, do district at the high resistant of porcelain insulator full skirt surface graphite linings and form continual and steady electric arc, the lasting calcination of electric arc makes porcelain insulator full skirt surface glaze layer generation galvanic corrosion damage.
2. a kind of porcelain insulator artificial acceleration electrical ageing test method according to claim 1, it is characterized in that, the concrete steps of the method are as follows:
Step 1, latticed brushing mould is covered porcelain insulator full skirt surface, and by graphite mixture brushing in the grid of brushing mould, after taking off brushing mould, porcelain insulator full skirt surface just forms multiple blocky graphite electrode, and the clearance channel between adjacent block graphite electrode is that high resistant does district;
Step 2, high-field electrode is arranged in the middle part of the end face of porcelain insulator full skirt scribbling graphite, ground-electrode is arranged on the end surface side edge of the porcelain insulator full skirt scribbling graphite, high-field electrode is connected to the high-voltage output end in high-potting loop, and ground-electrode is connected to grounded screen by series connection leakage current collection system;
Step 3, after guaranteeing that test connection is errorless, the graphite linings gap starting the arc on porcelain insulator full skirt surface is boosted to by high-potting loop modulation, maintain this voltage levvl, namely electric arc continued stable combustion can be kept, the glaze layer generation galvanic corrosion of porcelain insulator full skirt surface pilot region is damaged, namely can judge whether arc burning is stablized by the leakage current real-time waveform collected.
3. a kind of porcelain insulator artificial acceleration electrical ageing test method according to claim 1, it is characterized in that, described porcelain insulator comprises the suspended porcelain insulator for transmission line of electricity and the pillar porcelain insulator for transformer station.
4. a kind of porcelain insulator artificial acceleration electrical ageing test method according to claim 1, is characterized in that, described graphite linings is that crystalline flake graphite and liquid glue are prepared and the potpourri stirred by the quality proportioning of 1:1 ~ 1:2.
5. a kind of porcelain insulator artificial acceleration electrical ageing test method according to claim 1, it is characterized in that, described high-field electrode and ground-electrode are bare copper wire, for suspended porcelain insulator, be wound around one enclose bare copper wire as high-field electrode at its chapeau de fer and porcelain body junction; For pillar porcelain insulator, be wound around a circle bare copper wire as high-field electrode at its full skirt root porcelain knob; Ground-electrode adopts High temperature-resistanadhesive adhesive tape to be fixed on full skirt edge.
6. a kind of porcelain insulator artificial acceleration electrical ageing test method according to claim 1, is characterized in that, described high-potting loop comprises the power switch S, the pressure regulator T that connect power supply
1, HT testing transformer T
2, current-limiting resistance R, RC divider D and leakage current collection system, described leakage current collection system comprises leakage current sampling resistor R
a, data collecting card A, computing machine C, described pressure regulator T
1with HT testing transformer T
2input power frequency be 48Hz ~ 62Hz; Described power switch S two termination pressure regulator T
1input end, described pressure regulator T
1output termination HT testing transformer T
2input end, described HT testing transformer T
2high-voltage output end connect the high-pressure side of RC divider D through current-limiting resistance R and be arranged in high-field electrode on porcelain insulator P, the ground-electrode of described porcelain insulator P is by series connection leakage current sampling resistor R
awith HT testing transformer T
2grounded screen is connected to, described leakage current sampling resistor R together with the earth terminal of RC divider D
athe input end of output termination data collecting card A, the USB interface of the output terminate computer C of described data collecting card A.
7. a kind of porcelain insulator artificial acceleration electrical ageing test method according to claim 2, it is characterized in that, described brushing mould is a latticed fanning strip, in described fanning strip, grid is hollow out grid, the radius of fanning strip is less than the radius of the full skirt end face of porcelain insulator, and fan-shaped central angle is less than 360 ° for being greater than 0 °; Thickness is 0.5mm ~ 2mm.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104569767A (en) * | 2015-01-21 | 2015-04-29 | 国家电网公司 | Leakage current signal acquisition system of insulator |
| CN105203879B (en) * | 2015-09-17 | 2018-05-04 | 广西电网有限责任公司电力科学研究院 | A kind of disc insulator lifetime estimation method based on artificial accelerated aging test |
| CN105277822B (en) * | 2015-09-17 | 2018-06-12 | 广西电网有限责任公司电力科学研究院 | A kind of artificial accelerated aging test method for GIS disc insulators |
| CN105137311B (en) * | 2015-10-12 | 2018-01-19 | 哈尔滨理工大学 | A kind of dry-type air-core reactor turn-to-turn insulation electrical ageing test system and its test method |
| CN107843771B (en) * | 2017-10-30 | 2019-12-17 | 清华大学 | testing device for surface resistivity of composite insulator |
| CN109298273A (en) * | 2018-12-03 | 2019-02-01 | 醴陵华鑫电瓷科技股份有限公司 | A kind of electrical ageing test method of composite material insulator |
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