Ring current heating method-based transformer insulation thermal ageing test method and device

Abstract

The invention discloses a ring current heating method-based transformer insulation thermal ageing test method which comprises the following steps: winding a transformer coil sample by an insulation paper covered wire and arranging a temperature sensor and an optical fiber temperature measurement device on the coil sample; building a ring current heating transformer insulation thermal ageing test device, placing the coil sample in a test box which is filled with transformer oil to ensure that the coil is immersed in the transformer oil and serially connecting the test box which accommodates the coil sample to the interior of a vacuum constant-temperature box; electrifying the coil sample which is connected in series, and adjusting the ageing temperature through adjusting the current and carrying out ageing test; periodically taking out the oil paper insulated coil sample, and measuring the furfural content in the oil, the insulation paper polymerization degree and the transformer oil acidity of the oil paper insulated sample. The invention also discloses a transformer insulation thermal ageing test for a ring current heating method. According to the method and the device disclosed by the invention, the temperature rise process of the transformer winding can be simulated and the temperature change condition of the hot spot of the transformer winding can be reflected.

Description

technical field [0001] The invention belongs to the technical field of insulation aging of power system transformers, in particular to a transformer insulation heat aging test method and device based on a loop current heating method. Background technique [0002] At present, the transformer is an important part in the power system, and the safe operation of the transformer is related to the safe operation of the entire power grid. During the long-term operation of the transformer, it is prone to aging under the action of various external forces such as electricity, heat and chemistry. Insulation is the core part of the transformer, and its important insulation medium is oil and paper insulation to meet the required insulation strength under various voltages. The life of transformer insulation is mainly determined by its thermal aging. In the process of thermal aging, not only moisture is produced, but also the fiber structure of the paper will gradually break and become bri...

AI Technical Summary

Problems solved by technology

[0003] (1) The thermal aging box heating method cannot simulate the temperature rise process of the transformer winding;

[0004] (2) The heating method of thermal aging box cannot reflect the hot spots of transformer windings

Images