Tube paper-bakelite
Tube paper-bakelite
The tube paper-bakelite represents the layered material made by a method of continuous winding preliminary impregnated phenolformaldehy de by pitch paper roving with subsequent it calcification.
Tubes reeled up paper-bakelite are intended for work in transformer oil and on air at temperatures (15-35 0 C, relative humidity of 45-75 % and frequency of a current of 50 Hz. A class thermal-life characteristics 120°С.
TUBE paper-bakelite, CHARACTERISTICS:
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The name of parameters
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Unit of measure
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Tubes
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Breaking point at a static bend at (15-35) °С 45-75 %, not less
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МPа
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100
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Breaking point at compression along an axis at (15-35) °С 45-75 %, not less
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МPа
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40
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Breaking point at a stretching at (15-35) °С 45-75 %, not less
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МPа
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60
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Specific volumetric electric resistance, not less at (15-35) °С 45-75 % after air-conditioning 24ч/23°С/93 %
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Оhm х m
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5x1010
5x107
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Test pressure in a direction in parallel layers of M (90°С), transformer oil
During 1 minutes
During 5 minutes
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kVeff
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25
-
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The test pressure in a direction is perpendicular to layers of M (90°С), transformer oil during 1 minutes during 5 min for walls t. 2-10 mm
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-
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20
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Penetrative pressure in parallel layers at a variable pressure of frequency of 50 Hz transformer oil at 90 оС, not less
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-
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-
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Tangent of a corner of dielectric losses at frequency of 50 Hz, no more at (15-35) °С 45-75 %
At a pressure 103 kV
At a pressure 73 kV
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%
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0,025
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Density, not less
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g/sm3
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1,05
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