Assessment of non-uniform aging of solid dielectric using system poles of a modified debye model for oil-paper insulation of transformers

2013 ◽  
Vol 20 (5) ◽  
pp. 1922-1933 ◽  
Author(s):  
A. Baral ◽  
S. Chakravorti
Keyword(s):  
Debye Model ◽  
Solid Dielectric ◽  
Paper Insulation

The Simulation Study on Transformer Oil-Paper Insulation Polarization Spectrum

2013 ◽  
Vol 385-386 ◽  
pp. 1175-1178
Author(s):  
Jun Qiang Zhang ◽  
Tao Zhao ◽  
Yun Peng Liu
Keyword(s):  
Time Constant ◽  
Simulation Analysis ◽  
Debye Model ◽  
Diagnostic Methods ◽  
Transformer Oil ◽  
Equivalent Model ◽  
Polarization Spectrum ◽  
Paper Insulation ◽  
Transformer Insulation ◽  
Non Destructive

Return voltage diagnostic method is an effective method of non-destructive diagnosis in transformer insulating state. The current study is that through experiments get polarization spectrum to analysis the transformer insulating state, but not yet carried out the influence of various factors to the experimental results. So, based on the Debye model and specific parameters comes from one equivalent model of the actual transformer, this paper using RVM methods to simulation analysis maximum return voltage and dominant time constant under different factors. Simulation results show that the diagnostic methods that combine maximum return voltage value with dominant time constant can preferably reflect the transformer insulation state.

Research on the Equivalent Circuit Modeling of Oil-Paper Insulation of Transformer by Analyzing the Dielectric Spectra

2012 ◽  
Vol 260-261 ◽  
pp. 408-413
Author(s):  
Yong Qing Liu ◽  
Jin Ding Cai ◽  
Yan Xue Guo
Keyword(s):  
Equivalent Circuit ◽  
Time Domain ◽  
Equivalent Circuit Model ◽  
Debye Model ◽  
Dielectric Polarization ◽  
Dielectric Spectra ◽  
Equivalent Circuit Modeling ◽  
Frequency Domain Methods ◽  
The Time Domain ◽  
Paper Insulation

To assess the oil-paper insulation of transformer, it is necessary to establish the equivalent circuit for it regardless of using the time domain methods or frequency domain methods. Based on the principle of dielectric polarization, the extended Debye model is always adopted for the equivalent circuit of oil-paper insulation in transformer in most cases; however, it is usually difficult to determine the number of relaxation mechanisms in the model. This paper presents a method to determine it by the time domain dielectric spectra, namely, conduct differential operation for the depolarizing current of transformer’s oil-paper insulation to obtain the time domain dielectric spectra, and the number of spectrum peaks is equal to that of relaxation mechanisms. Thereby, the extended Debye model of the equivalent circuit of the oil-paper insulation of transformer can be built. This paper describes the analytical procedures of the time domain dielectric spectra method in detail and presents examples to validate its feasibility and rationality in determining the equivalent circuit model of transformer’s oil-paper insulation.

Sign in / Sign up

Export Citation Format

Share Document