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ASTM D3277

ASTM D3277 – Standard Test Methods for Moisture Content of Oil-Impregnated Cellulosic Insulation (Withdrawn 2010)

Description:

Significance and Use

Moisture has an adverse effect on the dielectric strength, dielectric loss, dc resistivity, and aging characteristics of oil-impregnated cellulosic insulating materials.

When cellulosic insulation such as paper and pressboard are impregnated with and immersed in oil, there is an interchange of moisture between the cellulose and oil until they attain equilibrium with respect to their relative saturations with moisture.

Considerable care should be taken in using these test methods to measure the water content of dry (<0.5 %) paper and board. Contamination of material by water from the surroundings during sampling and handling may be both rapid and significant in the case of dry test specimens. This is an even greater concern with cellulose insulation prior to oil impregnation.

Scope

1.1 These test methods cover the determination of the weight percent of water in new or aged, oil-impregnated electrical insulation. These test methods depend on solvent extraction of the water at room temperature. The range from 0.1 to 7.0% water has been explored.

1.2 There are four test methods, A, B, C, and D. Methods A and B for thin paper and dense materials, respectively, are manual methods for solvent extraction of water from the specimens. Titration is used to determine the amount of water. Method C uses automatic titration to determine the amount of water. Method D is a direct automated method for extraction and detection of the water.

Related Test Methods

ASTM D4950

ASTM D495

ASTM D4951

ASTM D4950

ASTM D495

ASTM D4948

ASTM D4946

ASTM D4943

ASTM D4940

ASTM D4935

ASTM D4929

ASTM D4928

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