X-ray dose based dry transformer winding material rapid identification method and detection device

Abstract

The invention discloses an X-ray dose based dry transformer winding material rapid identification method and a detection device. The method includes the steps of: determining a relation curve between copper material thickness and supersaturation voltage and a relation curve between aluminum material thickness and supersaturation voltage, determining the metal thickness of an outer high-voltage winding on a detected dry transformer, and calculating a copper / aluminum material theoretical supersaturation voltage, detecting an actually measured supersaturation voltage V by an X-ray generator and a ray dose detector, then comparing the actually measured supersaturation voltage V and the copper / aluminum material theoretical supersaturation voltage to identify the dry transformer winding material. The detection device consists of the X-ray generator and the ray dose detector, and the ray dose detector comprises a power supply circuit, a microprocessor, a data output module, an oscillation circuit and at least one G-M detector. The method and the device provided by the invention has the characteristic of no need for disassembly, and can realize rapid identification of the dry transformer winding material under the circumstance of no destruction of the body.

Description

technical field [0001] The invention relates to a winding material identification technology of a dry transformer (dry type transformer), in particular to a rapid identification method and a detection device for a dry transformer winding material based on an X-ray dose. Background technique [0002] In recent years, due to the rapid development of the economy, the technology of dry-type transformers has been continuously improved. Although the cost of dry-type transformers is relatively high, compared with oil-immersed transformers, it has the advantages of small size, convenient installation, simple maintenance, and safety. It has many advantages such as small distance and good safety performance, so it still has broad application prospects. [0003] The manufacturing materials of the dry transformer are basically flame-retardant materials. The insulating materials such as glass fibers wound around the coils have good self-extinguishing properties as flame-retardant materia...

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Problems solved by technology

Excessive winding temperature can lead to transformer failure and damage, and poor winding can lead to problems such as excessive load loss and high life reduction, which are directly related to the winding material

However, since the outer layer of the dry transformer is sealed with insulating materials such as glass fiber, the coil material cannot be directly tested. Therefore, in order to reduce production costs, some manufacturers currently use aluminum windings instead of copper windings. Tests such as load and transformation ratio cannot judge the material of the winding coil. Some units are used to detect the winding material inside the solid seal and insulating material, and even use destructive testing.

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