Testing device and evaluation method for radial deformation of single pancake coil of transformer

Abstract

The invention provides a testing device and an evaluation method for radial deformation of a single pancake coil of a transformer. The testing device comprises M magnetic field generating devices and a coil working power supply; each single magnetic field generating device is composed of a square opening iron core, an excitation winding, an excitation winding outgoing line, an axial iron core fixing device, an axial iron core supporting device and an excitation power source; the magnetic field generating devices take the circle center of a single pancake coil of the transformer as the circle center, M magnetic field generating devices are sequentially arranged at equal intervals along the coil under the condition that the opening of the square opening iron core is aligned with the single pancake coil of the transformer, and excitation winding outgoing lines of adjacent different excitation windings are sequentially connected in series and then are connected with the excitation power supply; the number of turns of each exciting winding is adjustable, so that the magnetic induction intensities of axial magnetic fields at different positions of a single pancake coil of the transformer are different; and a single pancake coil of the transformer is connected with a coil working power supply during working. The radial deformation degree of the single coil of the transformer can be evaluated more scientifically and accurately.

Description

technical field [0001] The invention relates to the technical field of electrical insulation on-line monitoring and fault diagnosis, in particular to a test device and an evaluation method for the radial deformation of a single pie coil of a transformer. Background technique [0002] The current evaluation of the radial force of the transformer coil is mainly realized by applying mechanical force through the simulation experiment device. This mechanical force is somewhat different from the electromagnetic force suffered by the transformer coil during the actual operation process, and the applied mechanical force cannot be like the actual operation of the transformer. In addition, the mechanical force on the transformer coil is applied by external effects, which cannot more truly reflect the damage effect on the insulating material outside the coil due to the deformation of the coil itself; at present, the degree of radial deformation of the coil is also There is no specific ...

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Problems solved by technology

[0002] The current evaluation of the radial force of the transformer coil is mainly realized by applying mechanical force through the simulation experiment device. This mechanical force is somewhat different from the electromagnetic force experienced by the transformer coil during the actual operation process, and the applied mechanical force cannot be compared with the actual operation of the transformer. In addition, the mechanical force on the transformer coil is applied by external effects, which cannot more truly reflect the damage effect on the insulating material outside the coil due to the deformation of the coil itself; at present, the degree of radial deformation of the coil is also There is no specific evaluation factor, and the winding deformation is generally judged and compared by visual inspection, lacking a more objective and scientific evaluation method

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