Synthetical fatigue testing system and method for extensional vibration and torsion of composite insulator

Abstract

The invention relates to a synthetical fatigue testing system and a synthetical fatigue testing method for extensional vibration and torsion of a composite insulator. The system comprises a linkage mechanism, a tension sensor, a static and dynamic load linkage loading mechanism, a cooling system and a torsion loading mechanism which are connected end to end, wherein the tension sensor, the static and dynamic load linkage loading mechanism, the cooling system and the torsion loading mechanism are respectively connected with a measurement control system; the static and dynamic load linkage loading mechanism and the torsion loading mechanism are respectively connected with a base. According to the system, one end of the composite insulator is applied with static tension along the axial direction and the dynamic tension with adjustable frequency, and the other end of the composite insulator is applied with the torsion tension with adjustable frequency by the measurement control system; a testing condition is provided for the fatigue property research of the composite insulation under the comprehensive effects of static load, dynamic extensional vibration load and the torsion load.

Description

Technical field: [0001] The invention relates to a test system in the field of high-voltage power transmission and transformation, in particular to a composite insulator tensile vibration and torsion comprehensive fatigue test system and method. Background technique: [0002] In the field of high-voltage power transmission and transformation, the two ends of the line insulator are connected to the overhead transmission line and the iron tower through special connection fittings, and they are used for insulation between the overhead transmission line and the iron tower. Affected by the gravity of the wire, the line insulator will bear the tensile force along its axial direction. Under certain conditions, the tensile force may vary from time to time. In addition, the line insulator may also be subject to alternating positive and negative directions. The role of torsion. Composite insulator is a commonly used line insulator. Its main load-bearing component is a core rod composited ...

AI Technical Summary

Problems solved by technology

During the test of the former, there is almost no torsional load, and the change range of the tensile force along the axial direction of the insulator is also small; the latter is limited by the original test system, and can only achieve a lower frequency (no more than 1 Hz or only a few Hertz) fatigue test, and once the test program is determined, the vibration frequency cannot be adjusted, so it takes a long time to complete a set of fatigue tests

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