Deformation measurement system for buckling tests on Continuously Transposed Cable using a high-speed camera

Abstract

An optical deformation measurement system for buckling tests on Continuously Transposed Cable (CTC) using high-speed camera recordings and marker tracking is proposed. The aim of the buckling test setup is to analyze the mechanical strength of CTCs with respect to radially acting electromagnetic forces as they appear in power transformers. Therefore a CTC winding arrangement is fed by a short-circuit current while the deformation is recorded by the camera system. The verification of the new deformation measurement system is done by an independent system based on acceleration sensors. Especially operationally aged power transformers can be affected by high short circuit currents, resulting in serious damages on windings. Thus, the influence of ageing phenomena on the mechanical strength of CTCs like degradation of the paper insulation shall be investigated with the proposed system. Experimental results are proposed for a factory-new CTC and the influence of paper insulation on its stiffness is evaluated from the marker tracking results during the short circuit tests.

Short-Circuit Strength of Power Transformer Windings-Verification of Tests by a Finite Element Analysis-Based Model

“…The image calibration is done with a ruler placed close to the markers. More details concerning the deformation measurement system are given in [11].…”