CN102955088B - A kind of zero resistance insulator detection method based on finite element data storehouse - Google Patents
A kind of zero resistance insulator detection method based on finite element data storehouse Download PDFInfo
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Abstract
Based on the zero resistance insulator detection method in finite element data storehouse, finite element analysis software is utilized to set up the model database of typical electric power line pole tower and corresponding insulator chain; And by finite element analysis software, analysis of electric field is carried out to the insulator chain model in model database, contactless electrical field test method is adopted during on-the-spot test zero resistance insulator, fieldtesting results and result of finite element are compared, in effective identification circuit insulator chain, whether there is zero resistance insulator and particular location thereof.The present invention, based on finite element stimulation, can grasp the Electric Field Distribution situation of multiple turriform, insulator chain, and replace partial test work with calculating, workload is less.The advantages such as meanwhile, can realize adopting contactless electrical field test method as zero resistance insulator detection method, the particular location of identifiable design zero resistance insulator, has and do not need to step on tower work, does not need to have a power failure and detects, safe and reliable.
Description
Technical field
The invention belongs to zero resistance insulator detection method, especially based on the zero resistance insulator detection method technical field in finite element data storehouse.
Background technology
Insulator is the important component part of transmission line of electricity, plays a part mechanical connection and electric insulation.For a long time, the detection of zero resistance insulator is the important process that circuit runs department always.Conventional zero resistance insulator detection means has sparking distance method, voltage's distribiuting method, corona pulse method, infrared thermal imagery thermometry etc., but these methods all exist certain defect.Wherein, sparking distance method workload is comparatively large, and may short circuit good insulation thus weaken effective insulation distance of insulator chain further, increases the weight of short trouble and threatens; Voltage's distribiuting method needs artificial upper shaft tower to test, and labor intensive is larger; The corona pulse electric current that corona pulse method measures insulator chain needs directly to contact with measurand, and directly can not reflect the electric discharge change of insulator.Infrared thermal imagery thermometry is judged by insulator infrared imaging result, and method affects by meteorological condition, external heat source interference etc., can not accurately judge.
Line insulator string bears voltage for a long time, and under ac high voltage effect, the Electric Field Distribution of insulator chain is extremely uneven, grasps insulator chain surface and space electric field distribution situation, can grasp insulator operation conditions, insulating property.The present invention proposes a kind of zero resistance insulator detection method based on finite element data storehouse, this method is using finite element stimulation result as basis for estimation, in the multiple turriform of grasp, on the basis of insulator chain Electric Field Distribution situation, scene adopts contactless electrical field test method as zero resistance insulator detection method, by test result and result of calculation are compared, effectively can identify whether the particular location that there is zero resistance insulator and zero resistance insulator, partial test work is replaced with calculating, workload is less, and have and do not need to step on tower work, do not need to have a power failure and detect, the advantage such as safe and reliable.
Summary of the invention
The object of the invention is to, propose to utilize finite element analysis software to set up typical shaft tower and insulator chain database, recycling software calculates insulator chain space electric field distributed data base.On the basis possessing database, the contactless electrical field test method of on-the-spot employing, compares by measured result and result of calculation, effectively judges whether there is zero resistance insulator and present position thereof in insulator chain.
The present invention is realized by following technical proposal.
Based on the zero resistance insulator detection method in finite element data storehouse, it is characterized in that, carry out according to the following steps:
(1) finite element analysis software is utilized to set up the model database of typical electric power line pole tower and corresponding insulator chain;
(2) by finite element analysis software, space electric field analysis is carried out to the insulator chain model in model database: calculate the spatial axes of each model in distance insulator chain 0.5m, 1m, 2m place axial path respectively to Electric Field Distribution situation, obtain the relation curve of insulator chain axial coordinate and space electric field value, set up insulator chain space electric field distributed data base;
(3) zero resistance insulator testing is carried out at scene: adopt contactless electrical field test method, utilize tested insulator chain 0.5m or 1m of electrical field test instrument measuring distance or 2m place (selecting according to the on-site actual situations) spatial axes vertically on path to electric field value, and record, curve plotting;
(4) from insulator chain space electric field distributed data base, the model calculation consistent with surveying test product is transferred, compare with the curve of on-the-spot test: if on-the-spot test curve is apparently higher than calculated curve, illustrate that insulator chain high-pressure side may exist zero resistance insulator; If local dent appears in on-the-spot test curve comparatively curve, illustrate that depression respective coordinates place insulator may be null value.
Content of the present invention is set forth further below in conjunction with accompanying drawing and example.
Accompanying drawing explanation
Fig. 1 is FB(flow block) of the present invention;
Fig. 2 is limited element calculation model and on-the-spot test schematic diagram;
Fig. 3 is FEM (finite element) calculation Electric Field Distribution curve and on-the-spot test Electric Field Distribution curve synoptic diagram.
Embodiment
Below in conjunction with drawings and Examples, the present invention is further described.
As Fig. 1, based on the zero resistance insulator detection method in finite element data storehouse, comprise the following steps:
(1) finite element analysis software is utilized to set up the model database of typical electric power line pole tower and corresponding insulator chain;
(2) by finite element analysis software, analysis of electric field is carried out to the insulator chain model in model database: calculate the spatial axes of each model in distance insulator chain 0.5m, 1m, 2m place axial path respectively to Electric Field Distribution situation, obtain the relation curve of insulator chain axial coordinate and space electric field value, set up insulator chain space electric field distributed data base;
(3) zero resistance insulator testing is carried out at scene: adopt contactless electrical field test method, utilize tested insulator chain 0.5m or 1m of electrical field test instrument measuring distance or 2m place (selecting according to the on-site actual situations) spatial axes vertically on path to electric field value, and record, curve plotting;
(4) from insulator chain space electric field distributed data base, the model calculation consistent with surveying test product is transferred, compare with the curve of on-the-spot test: if on-the-spot test curve is apparently higher than calculated curve, illustrate that insulator chain high-pressure side may exist zero resistance insulator; If local dent appears in on-the-spot test curve comparatively curve, illustrate that depression respective coordinates place insulator may be null value.
The model utilizing finite element analysis software to build is as Fig. 2, model is made up of shaft tower 1, insulator chain 2, wire 3, after electric Field Calculation, p-wire 4 is chosen for path from high-pressure side to low pressure end, when obtaining respectively from insulator chain 0.5m, 1m and 2m, the space electric field distribution curve in insulator chain axial coordinate.
Fig. 2 reflects on-the-spot test method.Choose equally and select according to on-site actual situations from insulator chain 0.5m or 1m or 2m() a vertical-path and p-wire 4 as electrical field test path, utilize insulating bar 6 to support electric field probe 5 to be tested to low pressure end (from the bottom to top) along p-wire 4 by high-pressure side, and by optical fiber 7, data are reached electrical field test instrument 8, carry out reading, curve plotting.
Fig. 3 is the good insulation substring that calculated by the finite element analysis software axial electric field strength curve (curve 2, curve 3) when there is zero resistance insulator in axial electric field strength curve (curve 1) and on-the-spot test in axial path in axial path.Wherein horizontal ordinate is the axial coordinate that the coordinate of axial test path and insulator chain are corresponding, and take high-pressure side as coordinate corresponding to starting point, ordinate is electric field intensity value.When insulator chain high-pressure side exists zero resistance insulator, as curve 2, test electric field intensity value is apparently higher than calculated value; When there is zero resistance insulator in the middle part of insulator chain, there is depression, as curve 3 in the p-wire coordinate place curve corresponding at zero resistance insulator.
Claims (1)
1., based on the zero resistance insulator detection method in finite element data storehouse, it is characterized in that, comprise the following steps:
1) finite element analysis software is utilized to set up the model database of typical electric power line pole tower and corresponding insulator chain;
2) by finite element analysis software, analysis of electric field is carried out to the insulator chain model in model database: calculate the spatial axes of each model in distance insulator chain 0.5m, 1m, 2m place axial path respectively to Electric Field Distribution situation, obtain the relation curve of insulator chain axial coordinate and space electric field value, set up insulator chain space electric field distributed data base;
3) zero resistance insulator testing is carried out at scene: adopt contactless electrical field test method, utilizes tested insulator chain 0.5m or 1m of electrical field test instrument measuring distance or the 2m place spatial axes vertically on path to electric field value, and record, curve plotting;
4) from insulator chain space electric field distributed data base, the model calculation consistent with surveying test product is transferred, compare with the curve of on-the-spot test: if on-the-spot test curve is apparently higher than calculated curve, illustrate that insulator chain high-pressure side may exist zero resistance insulator; If local dent appears in on-the-spot test curve comparatively curve, illustrate that depression respective coordinates place insulator may be null value.
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| CN109239550B (en) * | 2018-09-04 | 2020-11-27 | 国网山东省电力公司青岛供电公司 | Line insulation condition judgment method |
| CN110146796A (en) * | 2019-06-17 | 2019-08-20 | 贵州电网有限责任公司 | A kind of simulation test device and its test method of Zero resistance insulator string heat generation characteristic |
| CN111666705A (en) * | 2020-06-30 | 2020-09-15 | 上海工程技术大学 | Finite element analysis-based lead sag detection method and system |
| CN112147466A (en) * | 2020-08-14 | 2020-12-29 | 广东电网有限责任公司广州供电局 | Insulator string detection equipment and insulator string detection method |
| CN112285495A (en) * | 2020-09-21 | 2021-01-29 | 国网辽宁省电力有限公司营口供电公司 | Electric field distribution based method for judging deterioration of insulator of power transmission line |
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| CN101487866A (en) * | 2008-11-06 | 2009-07-22 | 姚建刚 | On-line detection method for AC power transmission line porcelain zero resistance insulator based on infrared thermal imaging |
| CN101576593A (en) * | 2009-05-15 | 2009-11-11 | 重庆大学 | Array type inferior insulator local electric field detector and inverse diagnosis method |
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| CN101487866A (en) * | 2008-11-06 | 2009-07-22 | 姚建刚 | On-line detection method for AC power transmission line porcelain zero resistance insulator based on infrared thermal imaging |
| CN101576593A (en) * | 2009-05-15 | 2009-11-11 | 重庆大学 | Array type inferior insulator local electric field detector and inverse diagnosis method |
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