CN101256212A - Comprehensive analysis testing method for extra-high voltage electric power gold tool - Google Patents
Comprehensive analysis testing method for extra-high voltage electric power gold tool Download PDFInfo
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- CN101256212A CN101256212A CNA2008100188551A CN200810018855A CN101256212A CN 101256212 A CN101256212 A CN 101256212A CN A2008100188551 A CNA2008100188551 A CN A2008100188551A CN 200810018855 A CN200810018855 A CN 200810018855A CN 101256212 A CN101256212 A CN 101256212A
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Abstract
The invention provides a comprehensive analysis test method of systematicness of extra high voltage class anchor clamp which has great influence to power generation run safety. The analysis method of modeling, computational analysis, test remodeling systematicness is formed for the electromagnetic field running environment of a variety of serial types of electric anchor clamp using self-defining modeling method. The said method changes the estimation design of the traditional electric anchor clamp and the limitation of underdeveloped test analysis method. The comprehensive analysis test method provides technique support for great important safe operation of extra high tension engineering.
Description
Technical field
The invention belongs to extreme high voltage power transmission and transformation technical field, relate to extra-high voltage gold utensil electromagnetic field analysis and optimization method, with the electromagnetic environment of improving the extra high voltage line operation.
Background technology
UHV transmission has at a distance, high capacity, low-loss advantage, is the effective way that realizes that energy resources are distributed rationally, can obtain good social economy's comprehensive benefit.Fed distance is long more, and extra-high voltage direct-current transmission is obvious more in the advantage of technical economical index in relatively.In the Eleventh Five-Year Plan of China's electrical network, the direct current UHV transmission will with the AC extra high voltage common development of transmitting electricity, finally become the important component part of national key rack.
The present invention is according to the characteristics of DC power transmission line, the Electric Field Characteristics of right ± 800kV extra high voltage direct current transmission line gold utensil is carried out numerical evaluation and analysis and research, propose to reduce the appropriate design scheme of insulator voltage share rate, avoid taking place strong corona discharge phenomenon, for the safe operation of extra high voltage direct current transmission line provides theoretical foundation, advance of the fast development of UHV transmission engineering in China.
Reduce the insulator voltage share rate at present and mainly rely on experience, generally the 2nd or the 3rd at insulator chain arbitrarily is provided with, suitably verify according to site test results again, bigger for extra-high voltage grade electric field intensity, studying Electric Field Distribution quantitatively has vital role for reducing extra-high voltage grade insulator voltage share rate.
Summary of the invention
The present invention mainly is too high at current power transmission line insulator string high-pressure side insulator voltage share rate, causes the insulator chain accelerated deterioration thus, this problem at extra-high voltage grade transmission line of electricity with even more serious.Along with the raising transmission line of electricity electromagnetic environment problem of electric pressure is also more serious, reduce visual corona and radio interference level and be very important index.
The present invention takes following technical scheme to realize:
1, size, size and the position of gold utensils such as research grading ring and shading ring propose rational improvement project to the influence of insulator chain Potential distribution and Electric Field Distribution;
2, the Electric Field Distribution that connects gold utensil, grading ring, shading ring is analyzed and calculated, propose the optimizing design scheme of gold utensil according to analysis result;
3, technical scheme of the present invention is specifically described as follows:
(1) first of technical scheme: the foundation of computation model
Suppose that corona free produces under institute's making alive, the insulator cleaning is dry, and air humidity is low, can ignore along face leakage current and space current, and the electric charge on the insulator metal cap remains unchanged.
(1) because the steel pin and the ball cap of two continuous insulators all are metals, and is in contact with one another, can be reduced to integral body;
(2) insulator adopts ball-eye with being connected of iron tower, adopts socket-clevis eye and wire clamp with being connected of lead.These gold utensil structures are all comparatively complicated, because himself shape is little to whole field domain influence, there is no need to carry out actual description, consider that the model description structure mainly is to determine the relative position of lead and shaft tower and insulator, therefore all is reduced to right cylinder with these metalworks;
(3) according to the actual computation experience, the umbrella-shaped structure of glass insulator and antifouling groove, little to whole field domain Electric Field Distribution influence, thereby in modeling, do not consider antifouling groove, and then save memory headroom and accelerate to find the solution speed.
3. the second portion of technical scheme: finite element model
In the extra-high voltage DC transmission system under the running status, owing to the existence of shaft tower, lead etc., the electric field of line hardware is three dimensional field and distributes, and its field domain structure, border are comparatively complicated.So the technical program has adopted the dimensional Finite Element method that is applicable to the complicated field domain of multimedia to carry out Calculation and Study.The boundary value problem of finite element model correspondence is:
First kind border comprises: high-pressure side, bus equipotential, low pressure earth terminal current potential.
The second class border comprises: the air enveloping surface, the plane of symmetry is evened up time second class border.
Insulator steel cap and steel pin: be suspended conductor.
(4) third part of technical scheme: the processing on unbounded border
Because the electric field of insulator chain, connection gold utensil, protection gold utensil etc. all belongs to open domain field problem, so the manual intercept border need rationally be set.The border can not be provided with too big, otherwise required calculated amount, memory space are very big.The border is if setting is too little, and computational accuracy is very poor again.Because Ansoft software provides the boundary processing method of two-dimentional unbounded field domain, so, we are when calculating, at first when not considering that lead, iron tower etc. influence, the field domain of insulator is treated as axially symmetric field, the unbounded border is set to the Ballon border, determines the outer cutoff boundary of three-dimensional computations field domain then according to two-dimentional result of calculation.
According to for extra-high voltage gold utensil and insulator analysis of electric field, proposed to reduce the key Design scheme that initial insulator voltage is born rate.
1, when change grading ring raise apart from the time, bigger to preceding 10 insulator voltage distribution influence.The present invention adopts and raises distance is the most suitable selection at 320mm to 370mm.
2, for the selection of V-type insulator chain subtended angle, after the requirement of satisfying maximum windage yaw, select subtended angle proper comparatively speaking between 90 degree are spent to 100.
3, near the field intensity the grading ring is bigger, can surpass the breakdown field strength of air at rough place maximum field strength.It is the key factor that line hardware produces visual corona.Therefore the present invention adopts the grading ring of full circle shape heavy in section (greater than 120mm).
Beneficial effect of the present invention is:
To comprehensive analysis testing method for extra-high voltage electric power gold tool, can obviously reduce extra-high voltage grade electric transmission line isolator voltage share rate, improve the transmission line of electricity electromagnetic compatible environment, significant for the extra-high voltage strategy that present country is advancing.The reduction of extra-high voltage gold utensil visual corona and radio interference level can make overhead line structures height and expropriation of land scope suitably descend, can reduce the transmission line construction investment significantly, reduce transmission line of electricity and significance is arranged for the influence of environment, strong make smooth advances the extra-high voltage that links closely development strategy in the extra-high voltage demonstration project.
Description of drawings
Fig. 1 is the-800kV direct current one pole transmission line of electricity metallic return mode V-type string realistic model (1/2) that dangles;
Fig. 2 is XOZ and YOZ tangent plane Potential distribution cloud atlas;
Fig. 3 is the insulator potential image;
Fig. 4 is an XOZ tangent plane Electric Field Distribution cloud atlas;
Fig. 5 for string 1 grading ring raise apart from not simultaneously voltage bear the comparison diagram of rate;
Fig. 6 for string 2 grading rings raise apart from not simultaneously voltage bear the comparison diagram of rate;
Fig. 7 is a V-type insulator chain subtended angle synoptic diagram;
Fig. 8 during for different subtended angle insulator voltage bear the comparison diagram (the 1st string) of rate;
Gold utensil and conductive line surfaces Electric Field Distribution (1/2) when Fig. 9 raises distance for 270mm for grading ring.
Embodiment
According to Figure of description, technical scheme of the present invention is described in further detail.
The present invention takes following technical scheme to realize:
1, size, size and the position of gold utensils such as research grading ring and shading ring propose rational improvement project to the influence of insulator chain Potential distribution and Electric Field Distribution, obtain having the conclusion of engineering significance.
2, the Electric Field Distribution that connects gold utensil, grading ring, shading ring is analyzed and is calculated, according to analysis result to the optimal design of the gold utensil scheme of advising.
3, the electromagnetic interference problem to extra-high voltage direct-current transmission carries out simulation analysis, according to analysis result the extra-high voltage direct-current transmission engineering is provided suitable suggestion.Principle of the present invention is specifically described as follows:
1) first of technical scheme: the foundation of computation model
Suppose that corona free produces under institute's making alive, the insulator cleaning is dry, and air humidity is low, can ignore along face leakage current and space current, and the electric charge on the insulator metal cap remains unchanged.
(1) because the steel pin and the ball cap of two continuous insulators all are metals, and is in contact with one another, can be reduced to integral body;
(2) insulator adopts ball-eye with being connected of iron tower, adopts socket-clevis eye and wire clamp with being connected of lead.These gold utensil structures are all comparatively complicated, because himself shape is little to whole field domain influence, there is no need to carry out actual description, consider that the model description structure mainly is to determine the relative position of lead and shaft tower and insulator, therefore all is reduced to right cylinder with these metalworks;
(3) according to the actual computation experience, the umbrella-shaped structure of glass insulator and antifouling groove, very little to whole field domain Electric Field Distribution influence, thereby in modeling, do not consider antifouling groove, and then save memory headroom and accelerate to find the solution speed.
2) second portion of technical scheme: finite element model
In the extra-high voltage DC transmission system under the running status, owing to the existence of shaft tower, lead etc., the electric field of line hardware is three dimensional field and distributes, and its field domain structure, border are comparatively complicated.So this project has adopted the dimensional Finite Element method that is applicable to the complicated field domain of multimedia to carry out Calculation and Study.The boundary value problem of finite element model correspondence is:
First kind border comprises: high-pressure side, bus equipotential, low pressure earth terminal current potential.
The second class border comprises: the air enveloping surface, the plane of symmetry is evened up time second class border.
Insulator steel cap and steel pin: be suspended conductor.
3) third part of technical scheme: the processing on unbounded border
Because the electric field of insulator chain, connection gold utensil, protection gold utensil etc. all belongs to open domain field problem, so the manual intercept border need rationally be set.The border can not be provided with too big, otherwise required calculated amount, memory space are very big.The border is if setting is too little, and computational accuracy is very poor again.Because Ansoft software provides the boundary processing method of two-dimentional unbounded field domain, so, we are when calculating, at first when not considering that lead, iron tower etc. influence, the field domain of insulator is treated as axially symmetric field, the unbounded border is set to the Ballon border, determines the outer cutoff boundary of three-dimensional computations field domain then according to two-dimentional result of calculation.
Dangling with V-type below, insulator string voltage distributes, the analysis and the research of electric field distribution characteristic describe:
1)-operation of 800kV direct current one pole
1. realistic model
Because the insulator model has symmetric property (front and back symmetry), 1/2 get final product so only need calculate it during modeling.Realistic model is annotated as shown in Figure 1: the circuit working voltage is got-800kV usually during the operation of direct current transportation one pole, and this is because the radio interference that reverse voltage produced is little than positive polarity voltage, and reverse voltage lightning protection calibration is fabulous.
2. result of calculation
A, whole field domain Potential distribution cloud atlas show whole field domain respectively as shown in Figure 2 at XOZ and YOZ tangent plane Potential distribution cloud atlas;
B. the voltage of edge is born rate, insulator potential image as shown in Figure 3, and wherein, string 1-is away from the insulator chain of shaft tower side.String 2-is near the insulator chain of shaft tower side; Table 1 has shown that the string 1 that calculates according to institute's established model, string 2 every insulator voltages bear rate;
Every insulator voltage of table 1 is born rate
C. the Electric Field Distribution cloud atlas has shown the Electric Field Distribution cloud atlas of XOZ tangent plane as shown in Figure 4;
D. different grading rings raise apart from the time insulator voltage bear rate and distribute as shown in Figure 5 and Figure 6, shown among Fig. 5 that the voltage of each insulator sheet is born rate in the 1st insulator string that is calculated when grading ring is raised distance and is respectively 270mm, 320mm, 370mm;
Shown among Fig. 6 when grading ring and raised when being respectively 270mm, 320mm, 370mm that the voltage of each insulator sheet is born rate in the 2nd insulator string that is calculated;
Table 2 and table 3 have provided respectively when grading ring and have raised when being respectively to 270mm, 320mm, 370mm, and the 1st insulator string preceding 10 and preceding 10 voltage of the 2nd insulator string are born the rate value.
Table 2 difference raise apart from the time the 1st insulator string preceding 10 voltage bear rate relatively
Table 3 difference raise apart from the time the 2nd insulator string preceding 10 voltage bear rate relatively
Insulator voltage is born the analysis result of rate during e. different subtended angle, Fig. 7 has shown V-type insulator chain subtended angle synoptic diagram, described subtended angle is the angle between two insulator strings, Fig. 8 shows when subtended angle and is divided into the comparison synoptic diagram that each sheet insulator sheet voltage in the 1st insulator string that 90 degree, 100 degree and 110 obtain according to the result of calculation of aforementioned model when spending is born rate
F. gold utensil and conductive line surfaces electric field as shown in Figure 9, Fig. 9 has shown that grading ring raises apart from gold utensil when the 270mm and conductive line surfaces Electric Field Distribution (1/2).
3. extra-high voltage electric power gold tool is based on the electromagnetic field optimizing design scheme.
A, when change grading ring raise apart from the time, bigger to preceding 10 insulator voltage distribution influence.The present invention adopts and raises distance is the most suitable selection at 320mm to 370mm.
B, for the selection of V-type insulator chain subtended angle, after the requirement of satisfying maximum windage yaw, select subtended angle at 90 degree to proper comparatively speaking between 100 degree.
Near c, the grading ring field intensity is bigger, can surpass the breakdown field strength of air at rough place maximum field strength.It is the key factor that line hardware produces visual corona.Therefore this patent adopts full circle shape heavy in section (＞120mm) grading ring.
The foregoing description does not limit the present invention in any form, and all technical schemes that form obtained of taking to be equal to replacement or equivalent transformation all drop within protection scope of the present invention.
Claims (5)
1, comprehensive analysis testing method for extra-high voltage electric power gold tool, it comprises that step is as follows:
(1) the electric Field Calculation model of the extra high voltage direct current transmission line gold utensil of the realistic environment of structure:
Suppose that corona free produces under institute's making alive, the insulator cleaning is dry, and air humidity is low, can ignore along face leakage current and space current, and the electric charge on the insulator metal cap remains unchanged;
The steel pin and the ball cap of two continuous insulators all are metals, and are in contact with one another, and are reduced to integral body;
Insulator adopts ball-eye with being connected of iron tower, adopts socket-clevis eye and wire clamp with being connected of lead, because the shape of ball-eye, socket-clevis eye and these gold utensils of wire clamp is little to whole field domain influence, above-mentioned gold utensil all is reduced to right cylinder;
The umbrella-shaped structure of glass insulator and antifouling groove, little to whole field domain Electric Field Distribution influence, in modeling, do not consider antifouling groove;
(2) adopt the dimensional Finite Element method that is applicable to the complicated field domain of multimedia that institute's established model in the step (1) is carried out computational analysis, determine the zoning of extra high voltage direct current transmission line gold utensil electric field, determine the cutoff boundary method of field domain;
(3) calculate of the influence of gold utensils such as grading ring, shading ring to the insulator chain electric field distribution characteristic;
(4) according to result of calculation, propose to reduce the appropriate design scheme of insulator voltage share rate: determine that suitable grading ring raises distance, determine suitable V-type insulator chain subtended angle, select the heavy in section grading ring of full circle shape, and grading ring is polished rough place in manufacturing and installation process.
2, comprehensive analysis testing method for extra-high voltage electric power gold tool according to claim 1, it is characterized in that, when not considering that lead, iron tower etc. influence, the field domain of insulator is treated as axially symmetric field, the unbounded border is set to the Ballon border, determines the outer cutoff boundary of three-dimensional computations field domain then according to two-dimentional result of calculation.
3, comprehensive analysis testing method for extra-high voltage electric power gold tool according to claim 1 is characterized in that, when change grading ring raise apart from the time, raise apart from 320mm in scope between the 370mm.
4, comprehensive analysis testing method for extra-high voltage electric power gold tool according to claim 1 is characterized in that, for the selection of V-type insulator chain subtended angle, after the requirement of satisfying maximum windage yaw, selects subtended angle between 90 degree are spent to 100.
5, comprehensive analysis testing method for extra-high voltage electric power gold tool according to claim 1 is characterized in that, the area of section of described grading ring is greater than 120mm.
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| CNA2008100188551A CN101256212A (en) | 2008-01-28 | 2008-01-28 | Comprehensive analysis testing method for extra-high voltage electric power gold tool |
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| CNA2008100188551A CN101256212A (en) | 2008-01-28 | 2008-01-28 | Comprehensive analysis testing method for extra-high voltage electric power gold tool |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102694352A (en) * | 2012-06-07 | 2012-09-26 | 甘肃省电力公司电力科学研究院 | Method for improving insulator potential distribution in overhead power transmission line |
| CN102694358A (en) * | 2012-06-07 | 2012-09-26 | 甘肃省电力公司电力科学研究院 | Method for improving potential distribution of insulators in transmission line in filthy and wet environment |
| CN105277822A (en) * | 2015-09-17 | 2016-01-27 | 广西电网有限责任公司电力科学研究院 | Artificial accelerated aging test method aiming at basin-type insulators of GIS |
| CN106205900A (en) * | 2016-08-24 | 2016-12-07 | 国网江西省电力公司南昌供电分公司 | A kind of gold utensil method for designing improving insulator contamination voltage and gold utensil |
-
2008
- 2008-01-28 CN CNA2008100188551A patent/CN101256212A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102694352A (en) * | 2012-06-07 | 2012-09-26 | 甘肃省电力公司电力科学研究院 | Method for improving insulator potential distribution in overhead power transmission line |
| CN102694358A (en) * | 2012-06-07 | 2012-09-26 | 甘肃省电力公司电力科学研究院 | Method for improving potential distribution of insulators in transmission line in filthy and wet environment |
| CN102694352B (en) * | 2012-06-07 | 2015-04-22 | 甘肃省电力公司电力科学研究院 | Method for improving insulator potential distribution in overhead power transmission line |
| CN102694358B (en) * | 2012-06-07 | 2015-08-19 | 甘肃省电力公司电力科学研究院 | Improve the method for insulator Potential distribution in transmission line under filthy wet environment |
| CN105277822A (en) * | 2015-09-17 | 2016-01-27 | 广西电网有限责任公司电力科学研究院 | Artificial accelerated aging test method aiming at basin-type insulators of GIS |
| 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 |
| CN106205900A (en) * | 2016-08-24 | 2016-12-07 | 国网江西省电力公司南昌供电分公司 | A kind of gold utensil method for designing improving insulator contamination voltage and gold utensil |
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Open date: 20080903 |