CN109557433B - Optimization test method for distance between enlarged umbrellas of 500kV ice and snow prevention composite insulator - Google Patents
Optimization test method for distance between enlarged umbrellas of 500kV ice and snow prevention composite insulator Download PDFInfo
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- 239000002131 composite material Substances 0.000 title claims abstract description 144
- 239000012212 insulator Substances 0.000 title claims abstract description 111
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- 238000005457 optimization Methods 0.000 title claims abstract description 17
- 238000010998 test method Methods 0.000 title claims abstract description 15
- 238000012360 testing method Methods 0.000 claims abstract description 100
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- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
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- G01R31/1245—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of line insulators or spacers, e.g. ceramic overhead line cap insulators; of insulators in HV bushings
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Abstract
The invention relates to an optimization test method for a distance between an enlarged umbrella of a 500kV ice and snow prevention composite insulator, which is mainly technically characterized by comprising the following steps of: manufacturing a 500kV composite insulator test sample for enlarging the spacing between umbrellas for an ice and snow flashover prevention test; the 500kV composite insulator test sample with the increased umbrella spacing is hung in a manual simulated climate laboratory to carry out an ice and snow flashover test by a uniform boosting method; and analyzing the scheme of increasing the umbrella spacing with the highest flashover voltage for the 500kV composite insulator ice and snow flashover test result. The invention has reasonable design, can guide the optimization test of the distance between the enlarged umbrellas of the 500kV composite insulators in different areas as a set of complete test flow of a system by manufacturing the 500kV composite insulator test sample for enlarging the distance between the umbrellas for the ice and snow flashover prevention test, carrying out the ice and snow flashover test by enlarging the distance between the umbrellas of the 500kV composite insulator according to the test result and optimizing the distance to obtain the comparison of the test result, and has the characteristics of comprehensive accuracy, easy realization and the like.
Description
Technical Field
The invention belongs to the technical field of ice and snow prevention composite insulators, and particularly relates to an optimization test method for a distance between enlarged umbrellas of a 500kV ice and snow prevention composite insulator.
Background
With the rapid development of the electric power industry in China, the installed capacity of a system and the voltage grade of a transmission line are continuously improved, and the requirements on the safety and the reliability of the operation of an electric power system are higher and higher due to the construction and the operation of a high-voltage and extra-high-voltage power grid. China is one of countries with serious ice coating of power transmission lines, large-area ice disaster accidents frequently occur in China, and the ice coating accidents of the power transmission lines occur in provinces such as Hubei, Hunan, Henan, Jiangxi and the like in China and three gorges, Yunnan, Guizhou and Sichuan in the southwest, Hebei, Shanxi, Nemeng and Jingjin Tang areas in the northwest, Qinghai in the northwest, Liaoning in the northeast and the like.
In recent years, an anti-ice and snow transformation test is carried out on a power transmission line in an ice and snow flashover area of a power grid part in North China, a power department adopts a composite anti-ice and snow insulator with an enlarged umbrella skirt, and the suspension string is kept to be a double-string design so as to improve the capability of preventing ice and snow flashover, windage yaw and string falling of the power transmission line. However, the influence of the suspension modes of double-string design such as II type, V type and inverted V type on the existing external insulation performance is not comprehensively considered, and particularly, the mechanical strength, the pollution flashover resistance and the lightning protection performance which are closely related to the ice and snow prevention composite insulator string in the actual operation process are not researched yet.
Therefore, the performance research of the power transmission line under the condition of double-string suspension of the anti-ice and anti-snow composite insulator is carried out, and theoretical calculation and simulation analysis are carried out on the aspects of mechanical characteristics, anti-pollution flashover, lightning protection and the like of a double-string suspension mode, so that a basis is provided for subsequent tests and technical improvement measures, and the problem which needs to be solved urgently at present is solved.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a 500kV ice and snow prevention composite insulator and umbrella spacing optimization test method which can effectively analyze the mechanical characteristics, pollution flashover prevention, lightning protection and other aspects of a double-string suspension mode and provide a basis for subsequent test and technical improvement measures.
The technical problem to be solved by the invention is realized by adopting the following technical scheme:
a500 kV ice and snow prevention composite insulator enlarged umbrella spacing optimization test method comprises the following steps:
and 3, analyzing the snow flashover test result of the 500kV composite insulator according to the scheme of increasing the umbrella spacing with the highest flashover voltage.
The specific processing method of the step 1 comprises the following steps:
manufacturing a splicing composite insulator unit capable of adjusting the distance between the enlarged umbrellas;
the 500kV composite insulator test sample with the umbrella spacing enlarged is assembled by using the splicing composite insulator units with the adjustable umbrella spacing enlarged.
The splicing composite insulator unit capable of adjusting the distance between the two umbrellas comprises a low-voltage end ball socket unit, a splicing composite insulator umbrella unit, a splicing composite insulator common umbrella unit and a splicing composite insulator high-voltage end ball head unit; the low-voltage end ball socket unit is composed of a low-voltage end metal ball socket and a low-voltage end insulating part, and the low-voltage end metal ball socket is arranged at one end of the low-voltage end insulating part; the spliced composite insulator enlarged umbrella unit comprises a composite insulating material enlarged umbrella, a composite insulating material small umbrella, a glass fiber core rod bolt and a glass fiber core rod nut, wherein the composite insulating material enlarged umbrella and the composite insulating material small umbrella are installed together; the common umbrella unit of the splicable composite insulator comprises a large umbrella made of composite insulating materials and a small umbrella made of composite insulating materials which are connected together; the high-voltage end ball head unit of the splicing composite insulator comprises a high-voltage insulating part and a high-voltage end metal ball head, wherein the high-voltage end insulating part is arranged at one end of the high-voltage end metal ball head.
The low-voltage end insulating part is coated with a composite external insulating material, and a glass fiber core rod is arranged in the low-voltage end insulating part; the high-voltage end insulating part is coated with a composite outer insulating material, and a glass fiber core rod is arranged inside the high-voltage end insulating part.
The diameter of the composite insulating material large umbrella is 300mm, and the diameter of the composite insulating material small umbrella is 135 mm; the diameter of the large umbrella made of the composite insulating material is 170 mm; the diameter of the small umbrella made of the composite insulating materials of the common umbrella unit of the composite insulator is 135 mm.
The step two is realized adding three kinds of following test articles through standardized bolt and nut to the combination preparation that increases umbrella quantity, interval, arrangement mode: the testing method comprises the following steps of (1) 500-I type composite insulator testing, 500-II type composite insulator testing and 500-III type composite insulator testing, wherein the 500-I type composite insulator testing is configured in a large mode and a small mode conventionally, and 45 common umbrella units are used in total; the 500-II type composite insulator test sample comprises six enlarged umbrellas, wherein each enlarged umbrella is matched with 7 common umbrellas to form 8 units, and the total number of the enlarged umbrellas is 45; the 500-III type composite insulator test sample comprises seven enlarged umbrellas, wherein each enlarged umbrella is matched with 6 common umbrellas to form 7 units, and the total number of the enlarged umbrellas is 45.
The specific implementation method of the step 2 comprises the following steps:
firstly, horizontally arranging and suspending three 500kV composite insulator samples which are prepared and have the same structure height and different umbrella spacing, connecting all low-voltage ends to the same bus through ball sockets and effectively grounding the low-voltage ends, and connecting all high-voltage ends to the same bus through metal and simultaneously increasing and applying alternating voltage;
then, the tested composite insulator is hung in a manual simulated climate laboratory, and the temperature control, the humidity control and the precipitation control are realized by the manual simulated climate laboratory;
and obtaining flashover voltages and change curves of the 500kV composite insulator test samples with different enlarged umbrella intervals by a uniform boosting method.
The step 3 takes the ice coating bridging degree as a characteristic quantity for evaluating the ice coating resistance, and the relationship between the bridging degree and the gap length satisfies the following formula:
wherein η -degree of bridging; l-the distance between adjacent large umbrellas or ultra-large umbrellas; d-the interval distance between the ice edges, the interval distance between the adjacent large umbrellas or the oversized umbrellas and the interval distance between the ice edges are obtained by acquiring an image and calculating.
The invention has the advantages and positive effects that:
according to the invention, the 500kV composite insulator test sample for enlarging the umbrella spacing for the ice and snow flashover prevention test is prepared, the ice and snow flashover test is carried out by enlarging the umbrella spacing of the 500kV composite insulator differently, the spacing is optimized according to the test result, the test result comparison is obtained, the test flow is a set of complete test flow of the system, the test for optimizing the umbrella spacing of the 500kV composite insulator at different degrees in different areas can be guided, and the method has the characteristics of comprehensive accuracy, easiness in realization and the like.
Drawings
FIG. 1 is a block diagram of a spliceable composite insulator unit of the present invention;
FIG. 2 is a schematic diagram of three types of test specimens, type 500-I, type 500-II, and type 500-III;
FIG. 3 is a horizontal layout view of a 500kV composite insulator;
FIG. 4 is a drawing of a 500kV composite insulator testing apparatus;
FIG. 5 is a schematic diagram of three types 500-I, 500-II and 500-III test samples;
FIG. 6 is a diagram of a 500-I type composite insulator icing flashover process;
FIG. 7 is a graph of the extent of icicle bridging for a type 500-I test article;
fig. 8 is a graph of the phenomenon of discharge along a string of a 500-I type composite insulator during the test;
FIG. 9 is a graph of the morphology of ice coating and the flashover process for type 500-II specimens;
FIG. 10 is a graph showing the extent of icicle bridging in a 500-II type clean sample;
FIG. 11 is a graph of the extent of icicle bridging for type 500-II stained specimens;
FIG. 12 is an ice coating morphology and ice coating flashover process for a type 500-III test article;
FIG. 13 is a graph showing the extent of icicle bridging in a 500-III type clean sample;
FIG. 14 is a graph showing the degree of icicle bridging in a type 500-III stained sample;
FIG. 15 shows the icing flashover voltage and the degree of bridging for the three samples.
Detailed Description
The embodiments of the present invention will be described in detail with reference to the accompanying drawings.
A500 kV ice and snow prevention composite insulator enlarged umbrella spacing optimization test method comprises the following steps:
In this step, in order to make multiple types of 500kV composite insulator test articles, at first, the spliceable composite insulator unit with the adjustable umbrella spacing that increases is made:
in order to carry out the optimization test method for enlarging the spacing between the umbrellas of the 500kV ice and snow prevention composite insulator, a splicing composite insulator unit shown in figure 1 is manufactured. The splicable composite insulator unit comprises a low-voltage end ball socket unit, a splicable composite insulator enlarged umbrella unit, a splicable composite insulator common umbrella unit and a splicable composite insulator high-voltage end ball head unit. The low-voltage end ball socket unit comprises a low-voltage end metal ball socket 1 and a low-voltage end insulating part 2, wherein the low-voltage end metal ball socket 1 is arranged at one end of the low-voltage end insulating part 2, the low-voltage end insulating part 2 is coated with a composite outer insulating material, and a glass fiber core rod is arranged inside the low-voltage end metal ball socket; the low voltage end insulated cross section 3 of the low voltage end ball and socket unit is shown in figure 1. The splicing composite insulator enlarged umbrella unit comprises a composite insulating material enlarged umbrella 4 with the diameter of 300mm, a composite insulating material small umbrella 6 with the diameter of 135mm, a glass fiber core rod bolt 5 and a glass fiber core rod nut 7, wherein the composite insulating material enlarged umbrella 4 and the composite insulating material small umbrella 6 with the diameter of 135mm are installed together, the glass fiber core rod bolt 5 is arranged at the outer end of the composite insulating material enlarged umbrella 4, and the glass fiber core rod nut 7 is arranged at the outer end of the composite insulating material small umbrella 6. The common umbrella unit of the spliceable composite insulator comprises a large umbrella 8 made of a composite insulating material and having a diameter of 170mm and a small umbrella 9 made of a composite insulating material and having a diameter of 135 mm. The high-voltage end ball head unit of the splicing composite insulator comprises a high-voltage insulating part 10 and a high-voltage end metal ball head 11, the high-voltage end insulating part 10 is coated with a composite outer insulating material, a glass fiber core rod is arranged inside the high-voltage end insulating part 10, and the high-voltage end insulating part 10 is arranged at one end of the high-voltage end metal ball head 11.
The optimization test method can be used for carrying out optimization tests on all types of composite insulators with the enlarged umbrella design. Every can splice composite insulator unit structure height 90mm, 500kV composite insulator structure height 4500mm, realize increasing umbrella quantity, interval, the combination of arrangement mode through the standardized bolt and nut that can splice and prepare following three kinds of samples: 500-I, 500-II, 500-III, as shown in FIG. 2. The 500-I type composite insulator test sample is configured in a large and small mode in a conventional mode, and 45 common umbrella units are used in total. The 500-II type composite insulator test sample contains six enlarged umbrellas, and each enlarged umbrella is matched with 7 common umbrellas to form 8 units, namely 45 units. The 500-III type composite insulator test sample contains seven enlarged umbrellas, and each enlarged umbrella is matched with 6 common umbrellas to form 7 units, and the total number of the enlarged umbrellas is 45. Fig. 5 shows three samples.
The spliced composite insulator with the adjustable and enlarged umbrella space, which is prepared in the step, is used for an ice and snow flashover prevention test, and the outer insulation part of the spliced composite insulator simulates a composite insulation material to be consistent; and the stress of the insulator is only dead weight and has no wire load under actual working conditions, so the bolt-nut type spliced insulator completely meets the test requirements.
And 2, hanging the 500kV composite insulator test sample with the increased umbrella spacing in a manual simulated climate laboratory for an ice and snow flashover test.
In this step, the prepared 500kV composite insulator samples with the same structural height and different increased umbrella spacing are firstly horizontally arranged and suspended, and all low-voltage ends are connected to the same bus bar through ball sockets and are effectively grounded, and all high-voltage ends are connected to the same bus bar through metal and simultaneously applied with ac voltage is increased, as shown in fig. 3. Since the AC high voltage application system is not the subject of the present invention, it is only indicated by symbols.
The tested composite insulators were then suspended in a manually simulated climate laboratory, as shown in fig. 4. In the figure, 1 is a manual simulated climate laboratory, 2 is a climate element control system, and 3 is a manual snowfall device. The artificial climate simulation laboratory realizes the elements of air temperature control, humidity control, precipitation control and the like, is not the content of the invention, and is only represented by symbols.
Obtaining flashover voltage and a change curve thereof of the umbrella with the different pitches by a uniform boosting method.
And 3, analyzing the snow flashover test result of the 500kV composite insulator according to the scheme of increasing the umbrella spacing with the highest flashover voltage.
In the step, the scheme of increasing the umbrella spacing with the highest flashover voltage is obtained for the comparison test results of the three types of composite insulator samples.
1. For 500-I type composite insulator
The 500-I type is configured in a conventional one-large-one-small mode, the ice edges of the composite insulator are unevenly distributed in the ice coating process, the ice edges of a strong field at a high-voltage end and a low-voltage end are usually short, most of the ice edges are in an unbridged state, and the number of the ice edges is small. And a large number of bridging icicles are formed in the middle weak field part of the test article. Because space-time difference exists in the distribution of the space rainfall in the ice coating process, certain large umbrellas in the low-field-intensity area in the middle of the test article are bridged firstly. When the area is bridged, the electric field in the middle part moves to the unbridged big umbrella, and a certain local strong field area is formed in the weak field area in the middle part, so that the unbridged icicle appearance also appears in the middle part of the sample.
FIG. 6 is a diagram of the arc development process during a boost flashover. In the process of voltage boosting flashover of the 500-I type test sample, a local electric arc is induced from a strong field area, and obvious creepage phenomenon begins to appear. The initial positions are two ends of the test article. When the arc developed to a certain length, the unbridged icicle in the middle of the test sample started to bear a larger voltage, forming a local arc. During the initial phase of arc formation, no significant arcing and partial discharge phenomena were observed at the surface of the bridging icicle. This indicates that unbridged icings are the primary factor in inducing arcing and even ice flashover. When the unbridged icicles along the string are bridged by the arc, the arc root energy melts the icicles, and the formed secondary unbridged icicles induce a new arc, so that the original arc can further develop until flashover, as shown in fig. 8.
2. For 500-II type composite insulator
The 500-II type test article contains six oversized umbrellas. The super-large umbrella can effectively protect the adjacent large umbrella, can reduce the ice edge bridging degree along the string, and is favorable for improving the ice lightning voltage value. FIG. 9 shows the morphology of ice coating and the flashover process of ice coating for type 500-II test articles. The low-voltage end strong field region of the 500-II type composite insulator is concentrated on the ultra-large umbrella, and the field intensity of the adjacent large umbrella is weakened, so that a large number of bridging icicles can appear at the edge of the low-voltage end large umbrella. The ice coating form of the high-voltage end has no obvious difference from the 500-I type, and is mostly short icicle. The ice coating appearance with ice prism and icicle coexisting can appear in the weak field strength area in the middle of the test sample, because the local high field strength area appears in the adjacent umbrella skirt after some large umbrellas are bridged, thereby forming an unbridged shape.
The ice-coating flashover process of the cut flower sample 500-II is different from that of the cut flower sample 500-I. The initial arc of the 500-I type test article appears at both ends of high and low voltage simultaneously, then local arc appears in the gap of unbridged ice edges of the middle weak field area, and finally develops in the icicle to form a through channel. And the air gap between the ultra-large umbrella at the low-voltage end of the 500-II type test sample and the large umbrella to be protected below can inhibit the formation of electric arcs, so that the initial electric arcs can only appear in a high-voltage end strong field region, and then a plurality of local electric arcs can be formed at the non-bridging ice edge under each ultra-large umbrella. The oversized umbrella increases the number of air gaps for limiting the development of electric arcs on one hand, and also plays a role in blocking the electric arcs on the other hand. With this configuration, the formation and development of an arc is limited within each oversized umbrella cell structure, which is the primary reason for the difference in flashover from the 500-I type.
3. 500-III type composite insulator
The 500-III type contains seven oversized umbrellas, and the icing and flashover processes of the test sample are similar to the change trend of the 500-II type test sample. FIG. 12 shows the morphology of ice coating and the flashover process of ice coating for type 500-III test articles. When the test article is clean, the bridging degree of the large umbrella under the steady-state ice covering condition is about 66 percent, and the bridging degree of the ultra-large umbrella is about 48.3 percent; and for the stained sample, the bridging degree of the large umbrella under the steady state ice covering condition is about 52.5 percent, and the bridging degree of the ultra-large umbrella is about 36.2 percent. The degree of bridging of soiled test articles is generally lower than that of clean test articles.
In the test process, the ice edge length is easy to calculate through images, so that the ice coating bridging degree is taken as a characteristic quantity for evaluating the ice coating resistance in the test process, and the relationship between the bridging degree and the gap length satisfies the formula (1):
wherein, η -degree of bridging (%); l-the distance (cm) between adjacent large umbrellas or ultra-large umbrellas; d-the icicle gap distance (cm).
FIG. 7 shows the degree of bridging of the icicles of the 500-I type test article, wherein the abscissa represents the icing time and the ordinate represents the degree of bridging of the icicles. Wherein the two curves and the curve respectively represent the change of the bridging degree of the 500-I type staining test article and the clean test article. In the figure, the rectangular box and the circular box each indicate the bridging degree of the sample along the entire string at that time, and the distribution deviation thereof indicates the distribution of the bridging degree of each icicle at the 95% confidence interval at that value. Fig. 10 and 11 show the bridging degree of the clean sample icicle of 500-II type and the bridging degree of the contaminated sample icicle of 500-II type, respectively, and fig. 13 and 14 show the bridging degree of the clean sample icicle of 500-III type and the bridging degree of the contaminated sample icicle of 500-II type, respectively, from which the bridging degree of the sample can be seen.
In the icing process of a 500kV test sample, the bridge connection degree value of the large umbrella is larger than that of the ultra-large umbrella, so that for the 500kV composite insulator test sample, the bridge connection degree of the large umbrella is a characteristic quantity reflecting the icing performance. FIG. 15 is a graph showing the icing flashover voltage and bridging degree of three samples at different surface conditions. Under clean conditions, the bridging degree and flashover voltage of the 500-I type, 500-II type and 500-III type samples are 78%/369 kV, 59%/400 kV and 66%/421 kV respectively; under the condition of pollution, the bridging degree and flashover voltage of the three samples are 76%/350 kV, 67%/374 kV and 53%/397 kV respectively.
Tests show that the disposition of the flower arrangement is favorable for improving the icing flashover voltage, the flashover voltage of a polluted test sample is lower (15-20) kV than that of a clean test sample, and the 500-III type structure has a relatively high flashover voltage value. Compared with a 500-II type sample, the bridging degree of the 500-III type structure is higher, the flashover voltage of the 500-III type structure is reduced theoretically, but the effect of the oversized umbrella for blocking electric arcs makes up the deficiency of the 500-III type structure in the bridging degree. However, the further increase of the number of the oversized umbrellas can cause the bridging degree of the oversized umbrellas to be larger than that of the large umbrellas, and the configuration failure of the oversized umbrellas occurs, which can be observed in a test sample test at a low voltage level. Therefore, the number of the 500kV composite insulator ultra-large umbrella configuration is not more than 7.
It should be emphasized that the embodiments described herein are illustrative rather than restrictive, and thus the present invention is not limited to the embodiments described in the detailed description, but also includes other embodiments that can be derived from the technical solutions of the present invention by those skilled in the art.
Claims (6)
1. A500 kV ice and snow prevention composite insulator enlarged umbrella spacing optimization test method is characterized by comprising the following steps:
step 1, manufacturing a 500kV composite insulator test sample for enlarging the spacing between umbrellas for an ice and snow flashover prevention test;
step 2, hanging the 500kV composite insulator test sample with the increased umbrella spacing in a manual simulated climate laboratory to perform an ice and snow flashover test by a uniform boosting method;
step 3, analyzing the snow flashover test result of the 500kV composite insulator to obtain a scheme of increasing the umbrella spacing with the highest flashover voltage;
the specific processing method of the step 1 comprises the following steps:
manufacturing a splicing composite insulator unit capable of adjusting the distance between the enlarged umbrellas;
splicing three types of 500kV composite insulator test articles with enlarged umbrella intervals by using the splicing composite insulator units with the adjustable enlarged umbrella intervals;
the splicing composite insulator unit capable of adjusting the distance between the two umbrellas comprises a low-voltage end ball socket unit, a splicing composite insulator umbrella unit, a splicing composite insulator common umbrella unit and a splicing composite insulator high-voltage end ball head unit; the low-voltage end ball socket unit is composed of a low-voltage end metal ball socket and a low-voltage end insulating part, and the low-voltage end metal ball socket is arranged at one end of the low-voltage end insulating part; the spliced composite insulator enlarged umbrella unit comprises a composite insulating material enlarged umbrella, a composite insulating material small umbrella, a glass fiber core rod bolt and a glass fiber core rod nut, wherein the composite insulating material enlarged umbrella and the composite insulating material small umbrella are installed together; the common umbrella unit of the splicable composite insulator comprises a large umbrella made of composite insulating materials and a small umbrella made of composite insulating materials which are connected together; the high-voltage end ball head unit of the splicing composite insulator comprises a high-voltage insulating part and a high-voltage end metal ball head, wherein the high-voltage end insulating part is arranged at one end of the high-voltage end metal ball head.
2. The 500kV ice and snow prevention composite insulator umbrella-enlarged spacing optimization test method according to claim 1, characterized in that: the low-voltage end insulating part is coated with a composite external insulating material, and a glass fiber core rod is arranged in the low-voltage end insulating part; the high-voltage end insulating part is coated with a composite outer insulating material, and a glass fiber core rod is arranged inside the high-voltage end insulating part.
3. The 500kV ice and snow prevention composite insulator umbrella-enlarged spacing optimization test method according to claim 1, characterized in that: the diameter of the composite insulating material large umbrella is 300mm, and the diameter of the composite insulating material small umbrella is 135 mm; the diameter of the large umbrella made of the composite insulating material is 170 mm; the diameter of the small umbrella made of the composite insulating materials of the common umbrella unit of the composite insulator is 135 mm.
4. The 500kV ice and snow prevention composite insulator umbrella-enlarged spacing optimization test method according to claim 1, characterized in that: the step two is realized adding three kinds of following test articles through standardized bolt and nut to the combination preparation that increases umbrella quantity, interval, arrangement mode: the testing method comprises the following steps of (1) 500-I type composite insulator testing, 500-II type composite insulator testing and 500-III type composite insulator testing, wherein the 500-I type composite insulator testing is configured in a large mode and a small mode conventionally, and 45 common umbrella units are used in total; the 500-II type composite insulator test sample comprises six enlarged umbrellas, wherein each enlarged umbrella is matched with 7 common umbrellas to form 8 units, and the total number of the enlarged umbrellas is 45; the 500-III type composite insulator test sample comprises seven enlarged umbrellas, wherein each enlarged umbrella is matched with 6 common umbrellas to form 7 units, and the total number of the enlarged umbrellas is 45.
5. The 500kV ice and snow prevention composite insulator umbrella-enlarged spacing optimization test method according to claim 1, characterized in that: the specific implementation method of the step 2 comprises the following steps:
firstly, horizontally arranging and suspending three 500kV composite insulator samples which are prepared and have the same structure height and different umbrella spacing, connecting all low-voltage ends to the same bus through ball sockets and effectively grounding the low-voltage ends, and connecting all high-voltage ends to the same bus through metal and simultaneously increasing and applying alternating voltage;
then, the tested composite insulator is hung in a manual simulated climate laboratory, and the temperature control, the humidity control and the precipitation control are realized by the manual simulated climate laboratory;
and obtaining flashover voltages and change curves of the 500kV composite insulator test samples with different enlarged umbrella intervals by a uniform boosting method.
6. The 500kV ice and snow prevention composite insulator umbrella-enlarged spacing optimization test method according to claim 1, characterized in that: the step 3 takes the ice coating bridging degree as a characteristic quantity for evaluating the ice coating resistance, and the relationship between the bridging degree and the gap length satisfies the following formula:
wherein η -degree of bridging; l-the distance between adjacent large umbrellas or ultra-large umbrellas; d-the interval distance between the ice edges, the interval distance between the adjacent large umbrellas or the oversized umbrellas and the interval distance between the ice edges are obtained by acquiring an image and calculating.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811470986.3A CN109557433B (en) | 2018-12-04 | 2018-12-04 | Optimization test method for distance between enlarged umbrellas of 500kV ice and snow prevention composite insulator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811470986.3A CN109557433B (en) | 2018-12-04 | 2018-12-04 | Optimization test method for distance between enlarged umbrellas of 500kV ice and snow prevention composite insulator |
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| CN109557433A CN109557433A (en) | 2019-04-02 |
| CN109557433B true CN109557433B (en) | 2020-11-13 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2461121Y (en) * | 2000-12-08 | 2001-11-21 | 征大生 | Connecting armour clamp of synthetic insulator |
| CN2478212Y (en) * | 2001-03-30 | 2002-02-20 | 戴娴 | Suspension lightning insulator of high voltage line |
| US7167007B2 (en) * | 2004-04-07 | 2007-01-23 | Georgia Tech Research Corporation | Apparatus and method for field testing MOV arresters |
| CN202871418U (en) * | 2012-07-27 | 2013-04-10 | 山东迅实电气有限公司 | 10-35 kV suspension insulator |
| CN206059037U (en) * | 2016-08-29 | 2017-03-29 | 保定冀开电力器材有限公司 | A kind of composite insulator |
-
2018
- 2018-12-04 CN CN201811470986.3A patent/CN109557433B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2461121Y (en) * | 2000-12-08 | 2001-11-21 | 征大生 | Connecting armour clamp of synthetic insulator |
| CN2478212Y (en) * | 2001-03-30 | 2002-02-20 | 戴娴 | Suspension lightning insulator of high voltage line |
| US7167007B2 (en) * | 2004-04-07 | 2007-01-23 | Georgia Tech Research Corporation | Apparatus and method for field testing MOV arresters |
| CN202871418U (en) * | 2012-07-27 | 2013-04-10 | 山东迅实电气有限公司 | 10-35 kV suspension insulator |
| CN206059037U (en) * | 2016-08-29 | 2017-03-29 | 保定冀开电力器材有限公司 | A kind of composite insulator |
Non-Patent Citations (1)
| Title |
|---|
| 不同串间距下双串并联绝缘子冰闪特性及其比较;褚正超 等;《水电能源科学》;20160430;第181-185页 * |
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