Power transformer with magnetic core of silicon steel strip and its production method

Abstract

The invention provides a power transformer with a magnetic core formed by threading and winding a silicon strip and is suitable for the capacity ranging from 30 kVA to 1600 kVA. The power transformer at least comprises a winding, a magnetic core module and an insulating bearing device. The module further comprises at least two winding assemblies. Each winding assembly comprises an inner winding and an outer winding, wherein the inner winding and the outer winding are sleeved and stacked together in the mode of sharing one mean axis and formed by winding glass fiber insulated copper wires around an inner ceramic skeleton and an outer ceramic skeleton respectively. The center axes of inner cavities of all the winding assemblies are connected end to end to form a ring shape and are located to a special machine tool. The silicon strip is plugged into the cavities in a threading and winding mode to form the magnetic core. The inner windings and the outer windings wrap the threading and winding magnetic core; the whole magnetic core is annealed at the temperature ranging from 750 DEG C-800 DEG C and then dipped with inflame-retardant paint and baked to manufacture the winding magnetic core module, and the insulating bearing device is installed on the magnetic core module to form the transformer with the threaded and wound magnetic core, under the circumstance of the similar materials, compared with a tailored lamination magnetic core transformer in the prior art, materials and work hours are saved greatly, and power transformation efficiency is improved; the size is smaller, the weight is lower, magnetic core flux leakage is smaller, and operating noise is lower.

Description

technical field [0001] The present invention relates to 30 to 1600 kVA (kilovolt-ampere) medium-capacity single-phase and three-phase power transformers and their manufacturing methods, especially involves making windings first, placing them on a special machine tool and winding silicon steel strips to form a magnetic core, and then implementing 750 ℃ to 800 ℃ overall annealing process. Background technique [0002] Power transformers in the prior art, whether oil-immersed or dry-type, must be cut or stamped with silicon steel sheets of many sizes, laminated to form a cylinder with a circular cross-sectional envelope line, and then assembled into an iron core structure. The process is numerous and complicated, and there is a lot of material waste, and the transformer made has large magnetic flux leakage and low power transformation efficiency. [0003] For a long time, people have been trying to find a new power transformer structure and process method, but the results are...

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to avoid the disadvantages of complex production process and high cost of the high-performance transformer in the prior art, and propose a high-performance through-wound magnetic core power transformer structure with simple production process and low cost and its production method

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