CN104239728B - The steep wave voltage of composite insulator is resistant to the evaluation method of nargin - Google Patents
The steep wave voltage of composite insulator is resistant to the evaluation method of nargin Download PDFInfo
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- CN104239728B CN104239728B CN201410488050.9A CN201410488050A CN104239728B CN 104239728 B CN104239728 B CN 104239728B CN 201410488050 A CN201410488050 A CN 201410488050A CN 104239728 B CN104239728 B CN 104239728B
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- 239000012212 insulator Substances 0.000 title claims abstract description 68
- 239000002131 composite material Substances 0.000 title claims abstract description 57
- 238000011156 evaluation Methods 0.000 title claims abstract description 10
- 230000005684 electric field Effects 0.000 claims abstract description 61
- 238000000034 method Methods 0.000 claims abstract description 7
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 67
- 239000010931 gold Substances 0.000 claims description 67
- 229910052737 gold Inorganic materials 0.000 claims description 67
- 238000012360 testing method Methods 0.000 claims description 38
- 238000009413 insulation Methods 0.000 claims description 33
- 229920002379 silicone rubber Polymers 0.000 claims description 33
- 210000003205 muscle Anatomy 0.000 claims description 2
- 238000002474 experimental method Methods 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 230000015556 catabolic process Effects 0.000 description 5
- 150000001875 compounds Chemical class 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000002788 crimping Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
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Abstract
The present invention provides the evaluation method that a kind of steep wave voltage of composite insulator is resistant to nargin.The composite insulator average flashover severity voltage and the physical dimension of composite insulator that methods described is obtained according to experiment calculate the electric-field intensity for obtaining composite insulator two maximum positions of electric field when bearing steep wave voltage, its interface related with composite insulator manufacture craft is born into voltage to compare, so as to estimate for the steep wave voltage of composite insulator tolerance nargin.
Description
Technical field
The present invention relates to high voltage electrical apparatus technical field, and in particular to a kind of steep wave voltage tolerance nargin of composite insulator
Evaluation method.
Background technology
Column support type composite insulator is generally using glass fiber resin plug and the composite insulation structure of silicon rubber umbrella.Reason
All show that the accident that this structure is occurred most frequently is between plug and the silicon rubber umbrella for coating it by analysis and accident statistics
Surface breakdown occurs for interface.The reason for causing this surface breakdown is mainly two kinds of uneven point of different materials compound tense materials
Cloth, forms minor insulation defect, and the interfacial insulator intensity of formation will be less than its mother metal, if defect area is excessive or uneven journey
Height is spent, can also be punctured under applied electric field.
Creep age distance of the composite insulator along interface is equal to the distance between upper and lower gold utensil in two ends, is only slightly less than along umbrella
Arc on the outside of skirt dodges distance, and the dielectric strength of air is much smaller than the dielectric strength at interface, therefore difficult using working-frequency voltage test
With the interfacial insulator performance of evaluating combined insulator.It is generally necessary to use insulating properties of the steep wave voltage to compound inslation sub-interface
Tested, this is the weber breakdown characteristics that make use of the air gap, under steep wave voltage, and the dielectric level of the air gap is at double
Improve, therefore be applied to the voltage at interface and be also improved.
But, the steep wave voltage lacked at present for composite insulator is resistant to the evaluation method of nargin.
The content of the invention
In view of this, the present invention provides the evaluation method that a kind of steep wave voltage of composite insulator is resistant to nargin.
Wherein, the composite insulator includes upper gold utensil, lower gold utensil, insulation mandrel and silicon rubber umbrella, the upper gold utensil
The insulation mandrel two ends are connected to lower gold utensil, and the silicon rubber umbrella is wrapped in the upper gold utensil, lower gold utensil and absolutely
Edge mandrel surface, the silicon rubber umbrella has multiple outstanding insulation full skirts, and methods described includes：
The average flashover severity voltage of the composite insulator is obtained by testing；
The flashover electric-field intensity that distance calculates the composite insulator is dodged according to the average flashover severity voltage and insulation subarc
Average value；
Distance is dodged according to the flashover average field intensity and the first arc and calculates the first test voltage；
First Interface electric field intensity is calculated according to first test voltage and the first interface distance；
Distance is dodged according to the flashover average field intensity and the second arc and calculates the second test voltage；
Second contact surface electric-field intensity is calculated according to second test voltage and second contact surface distance；
Electric-field intensity, the first Interface electric field intensity and second contact surface electric-field strength are resistant to according to the interface of the composite insulator
The steep wave voltage tolerance nargin of the degree estimation composite insulator；
Wherein, the insulation subarc dodges distance and dodges distance for the arc between the upper gold utensil and lower gold utensil；First arc
Dodge distance and dodge distance for the arc between the bared end of the upper gold utensil and first position；First interface distance is the upper gold
Vertical range between the lower end of tool and the first position；It is the bared end of the lower gold utensil and that second arc, which dodges distance,
Arc between two positions dodges distance；The second contact surface distance is hanging down between the upper end and the second place of the lower gold utensil
Straight distance；The first position is the root below the insulation full skirt minimum with the upper gold utensil lower end distance, the second
It is set to the root above the insulation full skirt minimum with the lower gold utensil upper end distance.
Preferably, it is described that electric-field intensity, the first Interface electric field intensity and the are resistant to according to the interface of the composite insulator
Second interface electric-field intensity estimates that the steep wave voltage tolerance nargin of the composite insulator includes：
Difference of the electric-field intensity respectively with the first Interface electric field intensity and second contact surface electric-field intensity is resistant to according to interface to estimate
Calculate the insulation margin of the composite insulator.
Preferably, the interface tolerance electric-field intensity is tested by pressure test obtains.
Preferably, the arc dodges the distance that distance is the air gap between 2 points.
Preferably, calculating the first Interface electric field intensity according to first test voltage and the first interface distance includes：
Calculate the first interface distance and silicon rubber umbrella equivalent interface distance and；
Calculate the first test voltage with it is described and business as the first Interface electric field intensity.
Preferably, calculating second contact surface electric-field intensity according to second test voltage and second contact surface distance includes：
Calculate second contact surface distance and silicon rubber umbrella equivalent interface distance and；
Calculate the second test voltage with it is described and business as second contact surface electric-field intensity.
Composite insulator average flashover severity voltage and the geometry of composite insulator that the embodiment of the present invention is obtained according to experiment
Size calculation obtains the electric-field intensity at composite insulator two maximum positions of electric field when bearing steep wave voltage, by it with being combined
The related interface of insulator manufacture craft is born voltage and compared, abundant so as to be resistant to for the steep wave voltage of composite insulator
Degree is estimated.
Brief description of the drawings
By description referring to the drawings to the embodiment of the present invention, above-mentioned and other purpose of the invention, feature and
Advantage will be apparent from, in the accompanying drawings：
Fig. 1 is the schematic cross-section of the column support type composite insulator of the embodiment of the present invention；
Fig. 2 is the flow chart of the evaluation method of the embodiment of the present invention；
Fig. 3 is the schematic diagram of the column support type composite insulator each several part parameter of the embodiment of the present invention.
Reference：
1：Upper gold utensil；11：Upper gold utensil bared end；12：Upper gold utensil lower end；2：Lower gold utensil；21：Lower gold utensil bared end；22：Under
Gold utensil upper end；3：Insulation mandrel；4：Silicon rubber umbrella；41：Full skirt；42：Full skirt root；5：First position；6：The second place
Embodiment
Below based on embodiment, present invention is described, but the present invention is not restricted to these embodiments.Under
Text is detailed to describe some specific detail sections in the detailed description of the present invention.Do not have for a person skilled in the art
The description of these detail sections can also understand the present invention completely.In order to avoid obscuring the essence of the present invention, known method, mistake
Journey, flow, element and circuit do not have detailed narration.
In addition, it should be understood by one skilled in the art that provided herein accompanying drawing be provided to explanation purpose, and
What accompanying drawing was not necessarily drawn to scale.
Unless the context clearly requires otherwise, otherwise entire disclosure is similar with the " comprising " in claims, "comprising" etc.
Word should be construed to the implication included rather than exclusive or exhaustive implication；That is, being containing for " including but is not limited to "
Justice.
In the description of the invention, it is to be understood that term " first ", " second " etc. be only used for describe purpose, without
It is understood that to indicate or imply relative importance.In addition, in the description of the invention, unless otherwise indicated, the implication of " multiple "
It is two or more.
Fig. 1 is the schematic cross-section of the column support type composite insulator of the embodiment of the present invention.As shown in figure 1, composite insulator
Including upper gold utensil 1, lower gold utensil 2, insulation mandrel 3 and silicon rubber umbrella 4.Upper gold utensil 1 and lower gold utensil 2 are connected to insulation mandrel
3 two ends, it can be generally connected with each other by crimping mode.Silicon rubber umbrella 4 is wrapped in gold utensil 1, lower gold utensil 2 and insulation
The outer surface of plug 3, silicon rubber umbrella 4 has multiple outstanding insulation full skirts 41.Each insulation full skirt 41 is from full skirt root
Portion 42 stretches out, so as to isolate to the air gap between upper gold utensil 1 and lower gold utensil 2, improves the insulating properties of insulator
Energy.
Upper gold utensil 1 has upper gold utensil bared end 11, and it is outside silicon rubber umbrella 4, with air contact so that upper gold utensil
1 can electrically connect with other parts；Upper gold utensil 1 also has lower end 12, and it is located between insulation mandrel 3 and silicon rubber umbrella 4.
Lower gold utensil 2 has lower gold utensil bared end 12, and it is outside silicon rubber umbrella 4, with air contact so that lower gold utensil
2 can electrically connect with other parts；Lower gold utensil 2 also has upper end 22, and it is between insulation mandrel 3 and silicon rubber umbrella 4.
Certainly, it should be readily apparent to one skilled in the art that the quantity and each insulated umbrella of the insulation full skirt 41 of silicon rubber umbrella 4
The size of skirt can be adjusted according to design needs.Size, the ratio of each part of composite insulator can also be according to designs
Need adjustment.
Due to the design feature of column support type composite insulator, the lower end 12 of upper gold utensil 1 nearby and lower gold utensil 2 upper end 22
Neighbouring electric field is maximum, easily occurs along interface breakdown, therefore, is estimated and can be evaluated whether by the electric field to above-mentioned two position
Tolerance nargin of the composite insulator to steep wave voltage.
Fig. 2 is the flow chart of the evaluation method of the embodiment of the present invention.As shown in Fig. 2 the compound inslation of the embodiment of the present invention
The evaluation method of the steep wave voltage tolerance nargin of son comprises the following steps：
Step 100, the average flashover severity voltage by testing the acquisition composite insulator.
When flashover refers to the gas or breakdown liquid dielectric around solid insulator, along solid insulator surface-discharge
Phenomenon.Voltage when it discharges is referred to as flashover voltage.After generation flashover, interelectrode voltage quickly fall to zero or close to
Zero.
Acquired average flashover severity voltage can be used for calculating when occurring flashover, and the average electric field of insulator surface is strong
Degree, namely flashover average field intensity.
Step 200, the flashover electric field that distance calculates the insulator dodged according to the average flashover severity voltage and insulation subarc
Average strength.
Wherein, the insulation subarc dodges distance and dodges distance for the arc between the upper gold utensil and lower gold utensil.Arc dodges distance
Refer to as the beeline of the air gap between 2 points.
Fig. 3 is the schematic diagram of the column support type composite insulator each several part parameter of the embodiment of the present invention.As shown in figure 3, in Fig. 1
In shown composite insulator, insulation subarc dodges distance and is equal to a+h+j+e.
Step 300, distance is dodged according to the flashover average field intensity and the first arc calculate the first test voltage.
Wherein, first arc dodges distance and dodges distance for the arc between the bared end of the upper gold utensil and first position.Institute
It is the root below the insulation full skirt minimum with the upper gold utensil lower end distance to state first position.First position shows with 5 in figure 3
Go out.In figure 3, the first arc dodges distance equal to a+b+c.
First test voltage is that voltage drop between upper gold utensil lower end and first position during flashover occurs for composite insulator.
Step 400, the first Interface electric field intensity calculated according to first test voltage and the first interface distance.
Wherein, first interface distance is the vertical range between the lower end and the first position of the upper gold utensil.
In figure 3, the first interface distance is equal to d.
Specifically, step 400 can include：
Step 410, calculate the first interface distance and silicon rubber umbrella equivalent interface distance and.
Silicon rubber umbrella equivalent interface distance is calculated according to the thickness and interfacial insulator characteristic of silicon rubber and obtained.In a reality
In example, silicon rubber umbrella equivalent interface distance can take 10mm.Accordingly, for the composite insulator shown in Fig. 3, the first interface away from
From with it is with a distance from silicon rubber umbrella equivalent interface and equal to d+10, that is, approximate between the lower end of upper gold utensil and first position
Interface distance is equal to d+10.
Step 420, calculate the first test voltage with it is described and business be used as the first Interface electric field intensity.
To occur upper voltage between gold utensil lower end and first position divided by distance between the two during flashover, then may be used
To obtain the average field intensity between two positions, that is, the first Interface electric field intensity.It can be estimated based on the electric-field intensity
The steep wave voltage tolerance nargin of composite insulator.
Step 500, distance is dodged according to the flashover average field intensity and the second arc calculate the second test voltage.
Wherein, second arc dodges distance and dodges distance for the arc between the bared end of the lower gold utensil and the second place.Institute
It is the root above the insulation full skirt minimum with the lower gold utensil upper end distance to state the second place.The second place shows with 6 in figure 3
Go out.In figure 3, the second arc dodges distance equal to e+f.
Second test voltage is that voltage drop between lower gold utensil upper end and second place during flashover occurs for composite insulator.
Step 600, according to second test voltage and second contact surface distance calculate second contact surface electric-field intensity.
The second contact surface distance is the vertical range between the upper end and the second place of the lower gold utensil.In Fig. 3
In, second contact surface distance is equal to g.
Specifically, step 600 can include：
Step 610, calculate second contact surface distance and silicon rubber umbrella equivalent interface distance and.
Silicon rubber umbrella equivalent interface distance is calculated according to the thickness and interfacial insulator characteristic of silicon rubber and obtained.In a reality
In example, silicon rubber umbrella equivalent interface distance takes 10mm.Accordingly, for the composite insulator shown in Fig. 3, second contact surface distance with
Silicon rubber umbrella equivalent interface distance and equal to g+10, that is, the approximate interface between the upper end of lower gold utensil and the second place
Distance is equal to g+10.
Step 620, calculate the second test voltage with it is described and business be used as second contact surface electric-field intensity.
To occur the voltage drop of flashover at present between gold utensil upper end and the second place divided by distance between the two, then
The average field intensity between two positions can be obtained, that is, second contact surface electric-field intensity.It can be estimated based on the electric-field intensity
Calculate the steep wave voltage tolerance nargin of composite insulator.
Step 700, electric-field intensity, the first Interface electric field intensity and the second boundary be resistant to according to the interface of the composite insulator
Face electric-field intensity estimates the steep wave voltage tolerance nargin of the composite insulator.
Specifically, according to interface be resistant to electric-field intensity respectively with the first Interface electric field intensity and second contact surface electric-field intensity
Difference estimates the insulation margin of the composite insulator.
Wherein, interface tolerance electric-field intensity is obtained by testing the pressure test of compound inslation subsample.
In an example, the size of composite insulator each several part is：, a=32mm, b=26mm, c=34mm, d=
12mm, e=70mm, f=55mm, g=14mm, h=53mm, j=205mm.
The average flashover severity voltage that experiment obtains this support insulator is 450kV, and flashover average field intensity is
450kV/ (32+53+205+70) mm=1.25kV/mm.
Based on flashover average field intensity and the first arc dodge distance can calculate the first test voltage for 1.25kV/mm ×
(32+26+34) mm=115kV；And then, by the first test voltage divided by the first interface distance d and silicon rubber umbrella equivalent interface
Apart from 10mm sum, the first Interface electric field intensity is obtained for 115kV/ (12+10) mm=5.23kV/mm.
Similarly, can calculate the second test voltage based on flashover average field intensity and the second arc sudden strain of a muscle distance is
1.25kV/mm × (70+55) mm=156.25kV, and then, by the second test voltage divided by second contact surface apart from d and silicon rubber umbrella
Sum of the equivalent interface apart from 10mm is covered, second contact surface electric-field intensity is obtained for 156.25kV/ (14+10) mm=6.51kV/mm.
By carrying out interface pressure test to multiple samples, obtain interface and be averagely resistant to electric-field intensity (11.7 ± 2.4)
KV/mm, minimum tolerance electric-field intensity 6.9kV/mm.
By calculating minimum tolerance electric-field intensity and above-mentioned first Interface electric field intensity and second contact surface electric-field intensity
Difference can obtain the estimated value of the steep wave voltage tolerance nargin of composite insulator.
Thus, the embodiment of the present invention is according to the composite insulator average flashover severity voltage and composite insulator for testing acquisition
Physical dimension calculates the electric-field intensity for obtaining two maximum positions of composite insulator electric field when bearing steep wave voltage, by its with
The related interface of composite insulator manufacture craft is born voltage and compared, resistance to so as to the steep wave voltage for composite insulator
Estimated by nargin.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, for those skilled in the art
For, the present invention can have various changes and change.It is all any modifications made within spirit and principles of the present invention, equivalent
Replace, improve etc., it should be included in the scope of the protection.
Claims (4)
1. the steep wave voltage of composite insulator a kind of is resistant to the evaluation method of nargin, the composite insulator include upper gold utensil, under
Gold utensil, insulation mandrel and silicon rubber umbrella, the upper gold utensil and lower gold utensil are connected to the insulation mandrel two ends, the silicon
Rubber umbrella cover is wrapped in the upper gold utensil, lower gold utensil and insulation mandrel surface, and the silicon rubber umbrella has multiple outstanding
Insulation full skirt, methods described includes：
The average flashover severity voltage of the composite insulator is obtained by testing；
It is averaged according to the flashover electric-field intensity that the average flashover severity voltage and insulation subarc dodge the distance calculating composite insulator
Value；
Distance is dodged according to the flashover average field intensity and the first arc and calculates the first test voltage；
First Interface electric field intensity is calculated according to first test voltage and the first interface distance；
Distance is dodged according to the flashover average field intensity and the second arc and calculates the second test voltage；
Second contact surface electric-field intensity is calculated according to second test voltage and second contact surface distance；
Interface is obtained by the interface pressure test to multiple samples and is resistant to electric-field intensity；And
Difference of the electric-field intensity respectively with the first Interface electric field intensity and second contact surface electric-field intensity is resistant to according to interface and estimates institute
State the steep wave voltage tolerance nargin of composite insulator；
Wherein, the insulation subarc dodges distance and dodges distance for the arc between the upper gold utensil and lower gold utensil；First arc dodge away from
With a distance from the arc sudden strain of a muscle between the bared end for the upper gold utensil and first position；First interface distance is the upper gold utensil
Vertical range between lower end and the first position；Second arc dodges the bared end and second that distance is the lower gold utensil
Arc between putting dodges distance；Second contact surface distance between the upper end and the second place of the lower gold utensil it is vertical away from
From；The first position is the root below the insulation full skirt minimum with the upper gold utensil lower end distance, and the second place is
Root with the lower gold utensil upper end distance above minimum insulation full skirt.
2. according to the method described in claim 1, it is characterised in that the arc dodge distance be the air gap between 2 points most
Short distance.
3. according to the method described in claim 1, it is characterised in that according to first test voltage and the first interface distance meter
Calculating the first Interface electric field intensity includes：
Calculate the first interface distance and silicon rubber umbrella equivalent interface distance and；
Calculate the first test voltage with it is described and business as the first Interface electric field intensity.
4. according to the method described in claim 1, it is characterised in that counted according to second test voltage and second contact surface distance
Calculating second contact surface electric-field intensity includes：
Calculate second contact surface distance and silicon rubber umbrella equivalent interface distance and；
Calculate the second test voltage with it is described and business as second contact surface electric-field intensity.
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| CN107576896A (en) * | 2017-08-30 | 2018-01-12 | 中国南方电网有限责任公司电网技术研究中心 | Rain-lightning voltage test method for porcelain post insulator |
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| CN107688141B (en) * | 2017-10-20 | 2023-12-29 | 广东电网有限责任公司电力科学研究院 | Interface of composite insulator Performance test system and method |
| CN110068754B (en) * | 2018-01-24 | 2021-01-08 | 上海交通大学 | Sample mould suitable for polymer thick insulation flat structure electrical breakdown test is used |
| CN110598368B (en) * | 2019-10-17 | 2022-11-22 | 江苏上上电缆集团有限公司 | Cable withstand voltage test structure design method |
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| JP2012248287A (en) * | 2011-05-25 | 2012-12-13 | Chugoku Electric Power Co Inc:The | Pin insulator |
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