Method for carrying out basin-type insulator mechanical property delivery inspection through utilization of indentation method
A pot-type insulator, factory inspection technology, applied in the direction of applying stable tension/pressure to test material strength, strength characteristics, force/torque/power measuring instrument, etc., can solve problems such as insulator damage, high detection cost, and heavy quality , to achieve the effects of intuitive quality evaluation standards, quick operation, and improved efficiency
Inactive Publication Date: 2019-09-13
XI AN JIAOTONG UNIV
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Problems solved by technology
This detection method has the following shortcomings: first, it will cause irreparable damage to the tested insulators, and none of the tested pot insulators can continue to be used, which makes the detection cost too high; second, it cannot directly pass the insulator itself. The mechanical parameters are used to reflect the curing and molding quality of epoxy materials, but the manufacturing quality is explained from one side according to the maximum external load that the insulator can bear. The evaluation method is not intuitive enough; third, the damage water pressure data obtained by the hydraulic method can only reflect the basin The quality of the weakest part of the basin-type insulator cannot reflect the overall uniformity of the curing of the epoxy part of the pot-type insulator
Fourth, the equipment used for hydrostatic detection is large in size, heavy in weight, high in cost and complicated in operation
The epoxy material used in pot insulators is doped with a large amount of Al 2 o 3 The polymer composite material is neither a crystalline material nor an isotropic material, so neither the X-ray method nor the ultrasonic method can be used for the residual stress test of epoxy materials for GIS pot insulators
On the other hand, the drilling method and the ring core method in the mechanical measurement method need to make holes and grooves on the surface of the insulator respectively, which will lead to discharge flashover faults during the use of the insulator, which will affect the continued use of GIS basin insulators
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[0025] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.
[0026] At present, for the factory test of the mechanical properties of GIS pot insulators, it is neither possible to determine the specific value of the surface residual stress of the pot insulator, nor can it reflect the distribution of the surface residual stress. For the method of factory inspection of GIS pot insulators using the trace method stress test system, see image 3 , including the following steps:
[0027] Step 1: Use the same material as the GIS pot insulator to pour in the calibration mold to obtain the calibration sample. Starting from the center of the calibration sample, paste the two-way strain gauges produced by Zhonghang Electronic Measuring Instrument Co., Ltd. to the two ends at a distance of not less than 20mm. select select -0.3σ y , -0.5σ y , zero stress, 0.3σ y , 0.5σ y , 0.7σ y and 0.8σ y These 7 stress le...
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The invention discloses a method for carrying out basin-type insulator mechanical property delivery inspection through utilization of an indentation method. A true value of a surface residual stress of a GIS basin-type insulator is obtained through utilization of an indentation method residual stress testing system, and the true value is taken as basis for evaluation of insulator quality. Comparedwith a conventional method for carrying out the insulator mechanical property delivery inspection through utilization of a hydraulic pressure method, the method for carrying out delivery inspection on basin-type insulator mechanical property through utilization of the indentation method residual stress testing system has the advantages that the method is a micro-damage measurement method, a product is prevented from being damaged uncorrectably, use of an inspected basin-type insulator is not influenced and cost of an inspection link is reduced; curing molding quality of an epoxy material is reflected through utilization of mechanical parameters of the product, and a quality evaluation standard is relatively visual and reliable; through multipoint measurement, distribution condition of thesurface residual stress is reflected, and obtained data for evaluation of the product quality is relatively rich and comprehensive; and inspection equipment is small in size, light in weight, simplein structure and rapid in operation, and inspection work efficiency can be improved.
Description
technical field [0001] The invention belongs to the technical field of processing and manufacturing of electric equipment, and relates to the evaluation of the mechanical properties of GIS pot insulators, in particular to a method for ex-factory inspection of the mechanical properties of pot insulators by using an indentation method. Background technique [0002] Operation experience shows that for UHV GIS pot insulators, the residual stress generated during the manufacturing process is the key factor leading to their damage during operation. At present, when carrying out the factory test of the mechanical strength of the pot insulator and the on-site handover test, the water pressure test is carried out, that is, the water pressure is applied to the concave surface of the selected pot insulator, and the pressure that the pot insulator withstands when it ruptures is recorded. According to the national standard The standard of pressure rupture strength test in Q / GDW 11127-201...
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IPC IPC(8): G01N3/08G01L5/00
CPCG01L5/0047G01N3/08G01N2203/0003G01N2203/0078G01N2203/0298
Inventor 周峻李永飞吴锴贾贝贝姜映烨郝留成袁端鹏
Owner XI AN JIAOTONG UNIV