Resin insulation dry type transformer with three-dimensional roll iron core

Abstract

The invention discloses a resin insulation dry type transformer with a three-dimensional roll iron core. The resin insulation dry type transformer comprises a transformer base, an upper clamping part, a lower clamping part and a three-dimensional roll iron core, wherein the upper clamping part and the lower clamping part are correspondingly arranged on the transformer base up and down, and the three-dimensional roll iron core is clamped between the upper clamping part and the lower clamping part; the three-dimensional roll iron core comprises three single frames, the middle parts of the single frames are hollowed out, and the single frames are of rounded rectangle structures in shape; the three single frames are arranged and spliced together in an equilateral triangle shape three-dimensionally; each single frame is formed by continuously winding a plurality of silicon steel trapezoid material straps in sequence; a coil is wound at the joint of every two single frames respectively; each coil is integrally poured by a curing agent and is formed through heating curing; and the exterior of each coil is encapsulated by epoxy resin respectively. The resin insulation dry type transformer is provided with the three-dimensional roll iron core, and has the characteristics of energy conservation and material saving, low no-load loss, low no-load current, low noise, good electrical performance, low partial discharge value, high lightning impulse resistance, high short-circuit resistance and high mechanical strength.

Description

technical field [0001] The invention relates to a transformer, in particular to a resin-insulated dry-type transformer with a three-dimensional wound iron core. Background technique [0002] General transformers use silicon steel sheets to make iron cores. When slitting, there are many corners of silicon steel sheets. In addition, there are joints between silicon steel sheets, which makes the core filling factor low and magnetic resistance large, resulting in excitation current, The no-load loss increases; and due to the magnetostriction of the silicon steel sheet and the electromagnetic attraction caused by magnetic flux leakage at the joints of the silicon steel sheet and between the laminations, it will cause the core to vibrate and generate noise. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a three-dimensional wound iron core resin insulated dry-type transformer. It has the characteristics of low dischar...

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Problems solved by technology

[0002] General transformers use silicon steel sheets to make iron cores. When slitting, there are many corners of silicon steel sheets. In addition, there are joints between silicon steel sheets, which makes the core filling factor low and magnetic resistance large, resulting in excitation current, The no-load loss increases; and due to the magnetostriction of the silicon steel sheet and the electromagnetic attraction caused by magnetic flux leakage at the joints of the silicon steel sheet and between the laminations, it will cause the core to vibrate and generate noise

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