Insulator bending load test method

by:Sinowon     2021-07-04
Insulator bending load test method
   Insulator bending load testing machine: 1. Line insulator installation A. Insulator installation a) Pin-type insulators The insulators should be fixed upright on the testing machine (when installed horizontally, the equivalence of the test results should be considered). When testing the bending strength of insulating parts only, special reinforced steel feet should be used to fix the insulating parts. b) The post insulator insulator should have a complete set of metal accessories for installation, and be installed upright on the testing machine (when installing at different installation angles, the equivalence of the test results should be considered), and the size of the supporting surface of the testing machine should be different. It is smaller than the size of the mounting surface of the sample. c) Porcelain cross arm insulators are fixed on the testing machine according to their use status (when installed horizontally, the equivalence of the test results should be considered), the size of the mounting support surface of the testing machine should not be less than the size of the installation surface of the test product, all-ceramic cross arm The insulator should be padded with soft buffer gaskets with a thickness of 1mm-2mm on both sides of the mounting surface, and the mounting bolts should have sufficient rigidity so that no obvious bending deformation occurs during the test. d) Butterfly type and spool type insulators. The insulators are installed on the testing machine as in normal use. The reinforcement nails used to install the test product should have sufficient rigidity so that no obvious bending deformation occurs during the test. B. The bushing installation insulator should generally be installed upright, and the flange should be fixed on the testing machine. When the test flange has two or more installation holes, the installation should be composed of two adjacent installation holes axis. The surface is perpendicular to the direction of the force (in special cases, the direction of the force can be used in actual use). Use a steel cable or tie rod of appropriate diameter to closely attach the long end cover of the test sample or the side of the conductive row (rod), and the applied load should pass through the axis of the insulator and be perpendicular to it. 2. Test procedure: A. Bending failure load test procedure During the test, the load should be increased smoothly and without impact before 75% of the specified bending failure load, and then 35%-100 of the specified bending failure load per minute. The rate of% increases until the sample is destroyed (obvious damage can be observed, or the load indication value of the testing machine no longer increases), and the load value at this time is the bending failure load of the sample. For post insulators, the load should be increased smoothly and without impact before 50% of the specified bending failure load, and thereafter, it should be increased at a rate of 35%-100% of the specified bending failure load per minute to the sample failure (energy Observe the obvious damage phenomenon, or the load indication value of the testing machine no longer increases), the load value at this time is the bending failure load of the test product. If only the withstand load test is required, the load is increased to the test load specified by the standard, and if the sample does not break under this load, the test will pass. B. Bending load test procedure one by one During the test, the load should be increased evenly and without impact to the specified bending load value one by one, and kept under this load for 10s. The sample should not be damaged or cracked in the adhesive (not including the adhesive) Small gaps between metal attachments) or metal attachments produce obvious permanent deformation and obvious displacement between various parts. When the four-way (or multi-directional) bending load test is used, after the test load is added to the specified test load value, the load is immediately removed (or according to the standard residence time of the specific product). The sample should not be damaged or the adhesive should be cracked (not Including the tiny gap between the glue and the metal attachment), or the obvious permanent deformation on the metal attachment and the obvious displacement between the parts. Each direction of the test, the sample should be rotated 90. Angle (or the angle calculated according to the number of test directions). C. Deflection test procedure under load The complete post insulator is installed on a rigid support, a bending load is applied to the free end of the test sample, and the load point is measured at each point of 20%, 50%, and 70% of the mechanical failure load. Offset


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