Test device and method for analyzing influence of winding defect induced heat on oil paper insulation performance

Abstract

The invention relates to a test device and method for analyzing the influence of winding defect induced heat on the oil paper insulation performance, and belongs to the field of fault diagnosis and status assessment of transformer oil paper insulation. The device comprises a current generation module, a winding defect module, an oil flow circulation module, a temperature measurement and sensing module, an insulation oil performance analysis module, and an oil immersed insulation paper performance analysis module. The current module is connected to the winding defect module. The winding defectmodule is placed in the oil flow circulation module. The temperature measurement and sensing module is used for measuring and sensing the temperature of the winding defect module and the oil flow circulation module. The insulation oil performance analysis module is used for analyzing the performance of the insulation oil. The oil immersed insulation paper performance analysis module is used for measuring and analyzing the physicochemical and electrical properties of the oil immersed insulation paper in different parts of a defective winding. The demonstration of the dynamic development law ofwinding overheating defects and the evaluation of the influence of the development of winding overheating defects on the physicochemical and electrical properties of winding insulation are achieved.

Description

technical field [0001] The invention belongs to the field of fault diagnosis and state evaluation of transformer oil-paper insulation, and relates to a test device and method for analyzing the influence of winding defect heating on oil-paper insulation performance. Background technique [0002] In the process of transmission and distribution of electric energy, the power transformer is the core of energy conversion and transmission, and the most important and critical equipment in the power grid. If a serious accident occurs to the transformer, it will not only cause damage to itself, but also interrupt the power supply, resulting in huge economic losses. Therefore, the reliability of power transformer operation plays a vital role in the safe operation of the entire power grid. With the development of ultra-high voltage transmission technology, the capacity of transformers is getting larger and larger. The increase in transformer capacity increases the loss of the transfor...

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Problems solved by technology

The existing research results at home and abroad do not consider the influence of oil-paper insulation material aging on the heating characteristics and temperature distribution of windings

[0005] In addition, according to statistics, the common defects of oil-paper insulated winding itself mainly include metal virtual welding, deformation, broken strands, inter-strand short circuit, oil-paper bulge, etc.

During the operation of the transformer, it is difficult to find the above-mentioned defects in the oil-paper insulated winding in time, and it is impossible to observe the process of the physical, chemical and electrical properties of the oil-paper insulation material deteriorating due to the heating caused by the internal defects of the winding, which in turn induces the transformer failure. It is the winding defect that causes the equipment to fail before taking analysis and treatment measures

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