CN102955088A - Zero resistance insulator detection method on basis of finite element database - Google Patents
Zero resistance insulator detection method on basis of finite element database Download PDFInfo
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Abstract
The invention relates to a zero resistance insulator detection method on the basis of a finite element database, which comprises the following steps of: by utilizing finite element analysis software, establishing a model database of a typical power transmission line tower and a corresponding insulator string; and carrying out electric field analysis on an insulator string model in the model database by the finite element analysis software, adopting a non-contact electric field test method when carrying out field testing on a zero resistance insulator, comparing a field test result with a finite element calculating result and effectively identifying whether the zero resistance insulator exists in the line insulator string and a specific position thereof. According to the invention, the zero resistance insulator detection method is on the basis of the finite element emulation calculation; the electric field distribution conditions of various towers and insulator strings can be mastered; part of test work is replaced with calculation; and the workload is lower. Meanwhile, the non-contact electric field test method can be used as the zero resistance insulator detection method; the specific position of the zero resistance insulator can be identified; and the zero resistance insulator detection method has the advantages that workers do not need to climb the tower to work, power does not need to be switched off to carry out detection, the zero resistance insulator detection method is safe and reliable and the like.
Description
Technical field
The invention belongs to the zero resistance insulator detection method, especially based on the zero resistance insulator detection method technical field of finite element database.
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 an important process of circuit operation department always.Conventional zero resistance insulator detection means has sparking distance method, voltage distribution, corona pulse method, infrared thermal imagery thermometry etc., but all there is certain defect in these methods.Wherein, sparking distance method workload is larger, thereby and the sub effective insulation distance that further weakens insulator chain of possibility short circuit good insulation, increase the weight of short trouble and threaten; The voltage distribution needs artificial upper shaft tower to test, and labor intensive is larger; The corona pulse electric current that the corona pulse method is measured insulator chain needs directly to contact with measurand, and can not reflect directly that the discharge of insulator changes.The infrared thermal imagery thermometry judges by insulator infrared imaging result, and method is affected by meteorological condition, extraneous thermal source interference etc., can not accurately judge.
Line insulator string bears voltage for a long time, and the Electric Field Distribution of insulator chain is extremely inhomogeneous under the ac high voltage effect, 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 the finite element database, this method with finite element simulation result of calculation as basis for estimation, grasping multiple turriform, on the basis of insulator chain Electric Field Distribution situation, the contactless electrical field test method of field by using is as the zero resistance insulator detection method, by test result and result of calculation are compared, can effectively identify the particular location that whether has zero resistance insulator and zero resistance insulator, replace partial test work with calculating, workload is less, and do not have and need step on tower work, the detection that need not have a power failure, 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.Possessing on the basis of database, the contactless electrical field test method of field by using compares with measured result and result of calculation, effectively judges whether have zero resistance insulator and present position thereof in the insulator chain.
The present invention realizes by following technical proposal.
A kind of zero resistance insulator detection method based on the finite element database is characterized in that, carries out according to the following steps:
(1) utilize finite element analysis software to set up the model database of typical electric power line pole tower and corresponding insulator chain;
(2) by finite element analysis software the insulator chain model in the model database is carried out the space electric field analysis: calculate respectively the spatial axes of each model on distance insulator chain 0.5m, 1m, 2m place axial path to the 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) the zero resistance insulator testing is carried out at the scene: adopt contactless electrical field test method, utilize the tested insulator chain 0.5m of electrical field test instrument measuring distance or 1m or 2m place (selected according to on-site actual situations) vertically the spatial axes on the path to electric field value, and record, curve plotting;
(4) from insulator chain space electric field distributed data base, transfer the model calculation consistent with surveying test product, compare with the curve of on-the-spot test: if the on-the-spot test curve, illustrates that may there be zero resistance insulator in the insulator chain high-pressure side apparently higher than calculated curve; If the on-the-spot test curve local dent occurs than curve, illustrate that depression respective coordinates place insulator may be null value.
Further set forth content of the present invention below in conjunction with accompanying drawing and example.
Description of drawings
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
The present invention is further described below in conjunction with drawings and Examples.
Such as Fig. 1, the zero resistance insulator detection method based on the finite element database may further comprise the steps:
(1) utilize finite element analysis software to set up the model database of typical electric power line pole tower and corresponding insulator chain;
(2) by finite element analysis software the insulator chain model in the model database is carried out analysis of electric field: calculate respectively the spatial axes of each model on distance insulator chain 0.5m, 1m, 2m place axial path to the 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) the zero resistance insulator testing is carried out at the scene: adopt contactless electrical field test method, utilize the tested insulator chain 0.5m of electrical field test instrument measuring distance or 1m or 2m place (selected according to on-site actual situations) vertically the spatial axes on the path to electric field value, and record, curve plotting;
(4) from insulator chain space electric field distributed data base, transfer the model calculation consistent with surveying test product, compare with the curve of on-the-spot test: if the on-the-spot test curve, illustrates that may there be zero resistance insulator in the insulator chain high-pressure side apparently higher than calculated curve; If the on-the-spot test curve local dent occurs than curve, illustrate that depression respective coordinates place insulator may be null value.
Model such as Fig. 2 of utilizing finite element analysis software to build, model is made of shaft tower 1, insulator chain 2, wire 3, after the electric Field Calculation, choose p-wire 4 from high-pressure side to low pressure end and be the path, when obtaining respectively from insulator chain 0.5m, 1m and 2m, the space electric field distribution curve on the insulator chain axial coordinate.
Fig. 2 has reflected the on-the-spot test method.Choose equally from insulator chain 0.5m or 1m or 2m(selected according to on-site actual situations) a vertical-path be that p-wire 4 is as the electrical field test path, utilize insulating bar 6 supporting electric Field probes 5 to be tested to low pressure end (from the bottom to top) by high-pressure side along p-wire 4, and by optical fiber 7 data are reached electrical field test instrument 8, carry out reading, curve plotting.
Axial electric field strength curve (curve 2, curve 3) when there be zero resistance insulator in Fig. 3 in axial electric field strength curve (curve 1) and the on-the-spot test for the good insulation substring that calculates by finite element analysis software on axial path on the axial path.Wherein horizontal ordinate is that the coordinate of axial test path is axial coordinate corresponding to insulator chain, the corresponding coordinate take high-pressure side as starting point, and ordinate is the electric field intensity value.When there was zero resistance insulator in the insulator chain high-pressure side, such as curve 2, test electric field intensity value was apparently higher than calculated value; When there was zero resistance insulator in the insulator chain middle part, depression appearred in the p-wire coordinate place curve corresponding at zero resistance insulator, such as curve 3.
Claims (1)
1. the zero resistance insulator detection method based on the finite element database is characterized in that, may further comprise the steps:
1) utilize finite element analysis software to set up the model database of typical electric power line pole tower and corresponding insulator chain;
2) by finite element analysis software the insulator chain model in the model database is carried out analysis of electric field: calculate respectively the spatial axes of each model on distance insulator chain 0.5m, 1m, 2m place axial path to the 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) the zero resistance insulator testing is carried out at the scene: adopt contactless electrical field test method, utilize the tested insulator chain 0.5m of electrical field test instrument measuring distance or 1m or 2m place vertically the spatial axes on the path to electric field value, and record, curve plotting;
4) from insulator chain space electric field distributed data base, transfer the model calculation consistent with surveying test product, compare with the curve of on-the-spot test: if the on-the-spot test curve, illustrates that may there be zero resistance insulator in the insulator chain high-pressure side apparently higher than calculated curve; If the on-the-spot test curve local dent occurs than curve, illustrate that depression respective coordinates place insulator may be null value.
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|---|---|---|---|---|
| CN103954891A (en) * | 2014-04-23 | 2014-07-30 | 国家电网公司 | Composite post insulator tolerance test simulation method |
| CN104198571A (en) * | 2014-09-24 | 2014-12-10 | 如皋市非标轴承有限公司 | Method for detecting crack on surface of worm gear combined pivotal bearing |
| CN104361168A (en) * | 2014-11-12 | 2015-02-18 | 国家电网公司 | Method for simulating electric field of 500kV alternating-current straight line tower |
| 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 |
| CN105866646A (en) * | 2016-06-03 | 2016-08-17 | 西安工程大学 | Insulation pull rod segmented local discharging detection method |
| CN106771924A (en) * | 2016-12-28 | 2017-05-31 | 国网内蒙古东部电力有限公司检修分公司 | A kind of utilization photoelectricity field sensor detects the detecting system and method for defects of insulator |
| CN107589351A (en) * | 2017-08-08 | 2018-01-16 | 国家电网公司 | A kind of low, zero resistance insulator detection method for insulator detecting robot |
| CN107729593A (en) * | 2017-08-16 | 2018-02-23 | 国家电网公司 | A kind of insulator detecting robot measurement voltage value correction method based on SVMs |
| CN108414900A (en) * | 2018-03-08 | 2018-08-17 | 云南电网有限责任公司电力科学研究院 | A kind of method and system of detection partial discharge of transformer |
| CN108717071A (en) * | 2018-08-31 | 2018-10-30 | 国网河北能源技术服务有限公司 | A kind of composite insulator umbrella skirt breakage diagnostic method |
| CN109239550A (en) * | 2018-09-04 | 2019-01-18 | 国网山东省电力公司青岛供电公司 | A kind of line insulation situation 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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| CN103954891A (en) * | 2014-04-23 | 2014-07-30 | 国家电网公司 | Composite post insulator tolerance test simulation method |
| CN104198571A (en) * | 2014-09-24 | 2014-12-10 | 如皋市非标轴承有限公司 | Method for detecting crack on surface of worm gear combined pivotal bearing |
| CN104361168A (en) * | 2014-11-12 | 2015-02-18 | 国家电网公司 | Method for simulating electric field of 500kV alternating-current straight line tower |
| CN104361168B (en) * | 2014-11-12 | 2017-10-20 | 国家电网公司 | 500kV AC linear shaft tower Electric Field Simulation methods |
| 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 |
| 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 |
| CN105866646A (en) * | 2016-06-03 | 2016-08-17 | 西安工程大学 | Insulation pull rod segmented local discharging detection method |
| CN105866646B (en) * | 2016-06-03 | 2019-01-11 | 西安工程大学 | A kind of method of insulated pull rod segmented Partial Discharge Detection |
| CN106771924A (en) * | 2016-12-28 | 2017-05-31 | 国网内蒙古东部电力有限公司检修分公司 | A kind of utilization photoelectricity field sensor detects the detecting system and method for defects of insulator |
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| CN107589351A (en) * | 2017-08-08 | 2018-01-16 | 国家电网公司 | A kind of low, zero resistance insulator detection method for insulator detecting robot |
| CN107729593A (en) * | 2017-08-16 | 2018-02-23 | 国家电网公司 | A kind of insulator detecting robot measurement voltage value correction method based on SVMs |
| CN107729593B (en) * | 2017-08-16 | 2021-02-23 | 国家电网公司 | Method for correcting measured voltage value of insulator detection robot based on support vector machine |
| CN108414900A (en) * | 2018-03-08 | 2018-08-17 | 云南电网有限责任公司电力科学研究院 | A kind of method and system of detection partial discharge of transformer |
| CN108717071A (en) * | 2018-08-31 | 2018-10-30 | 国网河北能源技术服务有限公司 | A kind of composite insulator umbrella skirt breakage diagnostic method |
| CN108717071B (en) * | 2018-08-31 | 2021-11-19 | 国网河北能源技术服务有限公司 | Composite insulator umbrella skirt damage diagnosis method |
| CN109239550A (en) * | 2018-09-04 | 2019-01-18 | 国网山东省电力公司青岛供电公司 | A kind of line insulation situation judgment method |
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