Device and method for nondestructively detecting materials for windings of power distribution transformers

Abstract

The invention discloses a device and a method for nondestructively detecting materials for windings of power distribution transformers. The device comprises an acquisition sensor, a signal conditioning circuit, a signal acquisition card, a detection computer, a detection controller, a discharge circuit and a power module. The device and the method have the advantages that the materials for the windings of the power distribution transformers can be conveniently detected and nondestructively measured by power transformation operation and maintenance staffs, unlawful suppliers can be prevented from passing aluminum as copper, and accordingly the quality of network-connected power distribution transformer products can be guaranteed; the service lives of the power distribution transformers can be prolonged after the device and the method are applied, the stability of the power distribution transformers can be improved, and accordingly the device and the method can be further comprehensively popularized to cover admission detection work on power distribution transformers of power distribution network systems of the state grid corporation and have obvious direct and indirect benefits; the work efficiency of the power transformation operation and maintenance staffs can be effectively improved, and the management level of the power transformation operation and maintenance staffs can be upgraded; problems can be discovered early, accordingly, the power supply reliability can be improved, safe and reliable operation of power grids can be fundamentally guaranteed, and the device and the method have obvious economic benefits.

Description

technical field [0001] The invention belongs to the technical field of power equipment material detection, and in particular relates to a nondestructive detection device and method for distribution transformer winding material. Background technique [0002] The distribution network is an important part of the power grid, and the distribution transformer undertakes the important tasks of voltage conversion, power distribution and transfer in the distribution system, so whether it can operate safely and reliably is of great significance to ensure the stable operation of the distribution system . Because of its excellent mechanical and electrical properties, copper is traditionally a conductive material and the main source of transformer windings. But, because the market price of copper is higher in the world, impel unscrupulous trader to use aluminum wire to impersonate copper wire or dope aluminum in copper wire. Due to the low melting point of aluminum wire, poor conductiv...

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Problems solved by technology

[0003] Since the electrical properties of aluminum windings and copper windings are very similar, it is difficult to distinguish the winding material of the transformer without damaging the distribution transformer. In addition, the windings of the distribution transformers produced by most manufacturers are processed by baking paint. This makes it more difficult to distinguish between them, which is why most transformers do not know the material of their windings until their windings are blown

The price of distribution transformers is very high, so if it is destructively tested, it will have a very large economic cost

However, there are no reports on non-destructive testing methods and devices for distribution transformer winding materials.

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