Insulating paper board

Insulating paper board is made of not bleached sulphatic cellulose with addition of cotton cellulose. It is made by one of two ways: or calendering, or rolling.

 The Insulating paper board belongs to group insulating materials of electric machines used for internal isolation and devices, separately or in a combination with others insulating materials. It is isolation of windings of transformers concerning the earthed core or the case, isolation of cores of throttles, rheostats, condensers, cables, electrogenerators, etc. the Greatest distribution to technics of electroisolation has received a combination insulating a cardboard and other products from cellulose (insulating a paper, an electrocardboard, pressboard, etc.) with mineral and transformer oils and pertinex varnishes.

Depending on structure, working temperature and a scope it is made following marks:

 The Insulating paper board "ЭВ" is made on ГОСТ 2824-86, used for work in the air environment at temperature up to 90°C. It is applied to manufacturing protective welding masks, transformers, switches, condensers, insulating linings, and also for grooving isolation of an electric equipment and isolation of details aircraft-, auto-, the tractor electroequipment, etc.

 The Insulating paper board of ГОСТ 4194-83 is made by sheets thickness of 0,5 -6,0 mm. Is issued marks АМ, A, Б, В, Г. Used in devices, in transformers, and also in other electric equipment with oil filling at working temperature up to 105°С inclusive. It is intended for manufacturing details of the main isolation of transformers by a pressure up to 750 kV, and also for details leveling and  isolation. It is used for manufacturing the stuck together details of transformers of all classes of a pressure, besides it it can be applied to isolation in other electric equipment with oil filling.

 INSULATING PAPER BOARD, CHARACTERISTICS:

 

The name of a parameter		Norm
The sizes:   Rolled   Sheet   The admission on thickness		Width of a roll-1000mm   1000Х2000mm    10 %
Composite structure		Cardboard, electrical insulating impregnation
Thermal-life		+90°С
Density, g/sm3		1-1,15
Moisture content, %		7,6(±2)
Mass fraction of ashes, %		0,95-1,0
Strength at a stretching, N/mm2	Thickness	0,1-0,15mm		0,2-0,25mm	0,3-0,4mm		0,5-3,0mm
	Longitudinal direction	70-80		90
	Cross-section direction	35
	Longitudinal direction after a bend	60		65
Penetrative pressure in the air environment, kV/mm		0,1-0,5mm	1,0-2,0mm			3,0mm
		11	10			9

 INSULATING PAPER BOARD "Б","Г", CHARACTERISTICS:

 

The name of a parameter	Norm	For mark
-	Mark Б	Маrk Г
Structure on a fibre of cellulose a sulphatic not benbane, %	100	100
Thickness, mm	1,00±0,10 1,50±0,10 2,00±0,15 2,50±0,15 3,00±0,20 4,00±0,30 5,00±0,35 6,00±0,40	0,50±0,05
Density, g/sm3, for a cardboard thickness, mm:   0,50   1,00; 1,50   2,00; 2,50; 3,00   4,00; 5,00; 6,00; 8,00	- 0,95-1,15 1,00-1,15 1,00-1,20	0,90-1,15 - - -
Strength at a stretching, МPа (kgs/mm2), not less:   In a machine direction   In a cross-section direction	80(8,0) 50(5,0)	70(7,0) 35(3,5)
Absorbency of oil, %, not less	15	8
Specific electric conductivity of a water extract, mksm/sm, no more:   At the module 1:50   At the module 1:20	45 90	45 90
Linear deformation, %, no more:   In a machine direction   In a cross-section direction   On thickness	0,8 1,1 5,0	- - -
Mass fraction of ashes, %, no more	0,7	0,9
Compressibility on air, %, no more:	12	-
Test pressure, кV, not less, for a cardboard thickness, mm: 0,50 1,00 1,50 2,00 2,50 3,00 4,00 5,00 6,00	- 31 43 53 61 66 76 84 90	19 - - - - - - - -
Durability to influence of superficial categories, mines, not less:   Average   Minimal	- 14 10	- 10 -
Humidity, %, no more, for a cardboard thickness, mm:   From 0,50 up to 1,60 inclusive   From above 1,60	10,0 8,5	10,0 -