In order to research the effect of temperature on the partial discharge of insulating paperboard with different aging degree

we established a model and experimental platform for oil-paper insulation creeping discharge. The board with different aging degree was prepared by thermal aging method

and the experimental temperatures of 40 ℃

60 ℃

and 100 ℃ were chosen to accelerate the discharge. The discharge characteristics of the paperboard under different temperatures and aging degrees were collected by partial discharge detector

and the carbonized parts of the paperboard were analyzed by infrared Fourier image and microscopi

c observation. And the electric field was simulated and analyzed combining with the theory. The results show that

the influence of the pre-discharge temperature on the creep discharge of the paperboard with different aging degree is small

and the discharge is mainly caused by the transformer oil near the electrode. And in the later stage of discharge

the discharge leads to the decomposition of the oil on the surface of the aging paper board to produce a large amount of gas. Meanwhile

the higher the temperature

the greater the role of promoting the decomposition of oil

the more intense discharge

related discharge characteristic quantity grows more quickly

and the amplitude is bigger. The maximum field strength of the diameter 0.125 mm is lower than that of the diameter 0.25 mm

and the high field intensity region is less; the electric field intensity increases about 1.9

2

.5 MV/m at 100 ℃ than at 40 ℃

and the higher the aging degree is

the higher the field intensity is. The experimental study shows that high temperature for different aging degree of the board along the surface of the film is greater than the low temperature

and the effect is more obvious in the late discharge. The higher the degree of aging of the cardboard

the greater the impact by the temperature

and the higher the degree of aging of the board

the more serious the insulation damage at high temperatures.