Bubble-containing oil paper insulation state evaluation simulation test method and system

Abstract

The invention discloses a bubble-containing oil paper insulation state evaluation simulation test method and system. The method comprises the following steps: building a partial discharge experiment platform containing bubble oil paper insulation; establishing bubble-containing oil paper insulation test models in different insulation states, and respectively placing the bubble-containing oil paper in different insulation states in uniform electric fields/non-uniform electric fields under different frequencies; performing partial discharge test on the partial discharge characteristic quantity of the bubble-containing oiled paper insulation models of different insulation-shaped bodies by using the partial discharge experiment platform, and determining a bubble-containing oiled paper insulation test result; extracting principal component factors of the partial discharge characteristic quantity by using a factor analysis method according to the insulation test result of the bubble-containing oil paper; constructing a GA-BP neural network aging evaluation model; and constructing a mathematical mapping relation based on the partial discharge characteristic quantity, and performing aging state evaluation on bubble-containing oiled paper in different insulation states according to the principal component factors and the GA-BP neural network aging evaluation model.

Description

technical field [0001] The present application relates to the technical field of fault diagnosis of electrical equipment, and in particular to a method and system for evaluating and simulating the insulation state of oil-paper containing air bubbles. Background technique [0002] Large-scale oil-immersed power transformers are the key equipment of the power system, and their insulation operation status and health level are directly related to the safety and stability of the power grid, and oil-paper insulation is the main form of internal insulation of oil-immersed power transformers. Diagnosis and evaluation of insulation state has important engineering significance. The main cause of insulation failure of power transformers is the insulation failure caused by partial discharge (PD, referred to as partial discharge) at the weak point of insulation. Partial discharge is not only the cause of insulation degradation, but also the precursor and manifestation of insulation degr...

AI Technical Summary

Problems solved by technology

But these methods all have certain deficiencies: the dissolved gas in DGA oil can not only come from paper aging, but also various gases will be produced during the oil aging process; furan derivatives are special products in the aging process of cellulose, but their concentration It will be affected by the thermosyphon and oil filter; DP and TS need to be measured off-line with a hanger, and the results obtained at different paper locations are quite different; the acid value and micro-water content in oil have an important impact on the aging process, but with No clear correlation between aging status

At present, partial discharge (PD) has been used as an important indicator of insulation state quality monitoring, but the evaluation of transformer oil-paper insulation state based on partial discharge has not been widely used in engineering