A Method for Evaluating the Aging State of Converter Transformer Oil-paper Insulation

Abstract

The invention discloses a method for evaluating the aging state of the oil-paper insulation of a converter transformer, which belongs to the technical field of converter transformer operation and maintenance. Composite insulation interface polarized attenuation current and differential transformation to obtain the time-domain dielectric response function dielectric spectrum curve, double-peak branch polarization charge Q(t), relaxation time τ n and branch shape parameter α n Extraction, the main relaxation time and oil-paper polymerization value are fitted to obtain the fitting curve, according to the differential time domain spectrum main relaxation time of the actual converter transformer to obtain the oil-paper polymerization degree of the actual converter transformer, and evaluate the performance of the oil-paper insulation structure of the converter transformer Aging state. It solves the problem that the polarization and depolarization current method cannot be used to directly and accurately evaluate the aging degree of oil-paper insulation for complex transformer oil-paper insulation systems.

Description

technical field [0001] The invention belongs to the technical field of operation and maintenance of converter transformers, and in particular relates to a method for evaluating the aging state of oil-paper insulation of converter transformers. Background technique [0002] The converter transformer is one of the important power equipment for power transmission in the power grid. Its safe and stable operation is the key to the stability of the power grid. The converter transformer is internally subjected to the combined action of multiple factors and multiple physical fields, which makes its internal oil-paper insulation aging faster. Therefore, how to accurately judge the aging degree of the oil-paper insulation of the converter transformer has become the focus of the on-site operation and maintenance personnel. [0003] The insulating material of the converter transformer is mainly composed of transformer oil and solid insulation (paper, cardboard, etc.). The traditional me...

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the shortcomings of the existing technology: the present invention provides a method for evaluating the aging state of the oil-paper insulation of converter transformers, which is used to solve the problem that the oil-paper insulation system of a complex transformer cannot be directly and accurately evaluated by the polarization and depolarization current method The problem of insulation aging degree

Images