Aging assessment of transformer solid insulation: A review

2021 ◽  
Author(s):  
Gengadevi Kaliappan ◽  
Madavan Rengaraj
Keyword(s):  
Solid Insulation

Solid insulation drying of 110 kV paper-oil instrument transformers

2009 ◽  
Vol 25 (25) ◽  
pp. 35-38 ◽  
Author(s):  
Gerards Gavrilovs ◽  
Sandra Vītoliņa
Keyword(s):  
Temperature Regulation ◽  
Drying Method ◽  
Instrument Transformers ◽  
Conventional Drying ◽  
Solid Insulation

Solid insulation drying of 110 kV paper-oil instrument transformersInfluence of moisture on the instrument transformers' paper-oil insulation and its further maintenance is described in this paper. Improved insulation drying method using vacuum and temperature regulation with definite regulation algorithm of parameters is proposed and analyzed by comparing it with conventional drying method.

Mechanical aspects of electrical treeing in solid insulation

1996 ◽  
Vol 12 (2) ◽  
pp. 21-26 ◽  
Author(s):  
B.R. Varlow ◽  
D.W. Auckland
Keyword(s):  
Electrical Treeing ◽  
Solid Insulation

Apparent and True Charges in the Partial Discharge Model at Different Defective Domain Sizes

2021 ◽  
Vol 64 (6) ◽  
pp. 94-100
Author(s):  
Nikolay Ignatev ◽  
◽  
Sergey Tetiora ◽  
Dmitry Turkin ◽  
◽  
...  
Keyword(s):  
Equivalent Circuit ◽  
Partial Discharge ◽  
Diagnostic Value ◽  
Partial Discharges ◽  
Active Resistance ◽  
Air Cavity ◽  
Discharge Ignition ◽  
Discharge Model ◽  
Air Cavities ◽  
Solid Insulation

A model of the partial discharges in a sample of solid insulation with air cavity is presented. The material of the insulation is cross-linked polyethylene. The model is based on an active-capacitive equivalent circuit, in which the resistance of the air cavity at the instant of a partial discharge ignition is shunted by the active resistance of the spark. The model takes into consideration the delay of the discharge development. The evaluation of the diagnostic value of the apparent and true charges is carried out. The results of the apparent and true charges relationship with the dimensions and proportions of the air cavity are presented. It is shown that the same magnitude of both true and apparent charges can correspond to the different volumes and shapes of the air cavities in the insulation.

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