ASTM D3277-95e1

Standard Test Methods for Moisture Content of Oil-Impregnated Cellulosic Insulation

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.  
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

General Information

• Status: Historical
• Publication Date: 14-Jun-1995
• Technical Committee: D27 - Electrical Insulating Liquids and Gases
• Drafting Committee: D27.06 - Chemical Test

Relations

• Replaces: ASTM D3277-95 - Standard Test Methods for Moisture Content of Oil-Impregnated Cellulosic Insulation
• Effective Date: 15-Jun-1995
• Replaced By: ASTM D3277-95(2001)e1 - Standard Test Methods for Moisture Content of Oil-Impregnated Cellulosic Insulation (Withdrawn 2010)
• Effective Date: 15-Jun-1995
• Referred By: ASTM E203-23 - Standard Test Method for Water Using Volumetric Karl Fischer Titration
• Effective Date: 15-Jun-1995
• Referred By: ASTM D202-23 - Standard Test Methods for Sampling and Testing Untreated Paper Used for Electrical Insulation
• Effective Date: 15-Jun-1995

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
e1
Designation: D 3277 – 95
Standard Test Methods for
1
Moisture Content of Oil-Impregnated Cellulosic Insulation
This standard is issued under the fixed designation D 3277; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1
e NOTE—Editorial changes were made in March 2001.
1. Scope 4.2 When cellulosic insulation such as paper and pressboard
are impregnated with and immersed in oil, there is an inter-
1.1 These test methods cover the determination of the
change of moisture between the cellulose and oil until they
weight percent of water in new or aged, oil-impregnated
attain equilibrium with respect to their relative saturations with
electrical insulation. These test methods depend on solvent
moisture.
extraction of the water at room temperature. The range from
4.3 Considerable care should be taken in using these test
0.1 to 7.0 % water has been explored.
methods to measure the water content of dry (<0.5 %) paper
1.2 There are four test methods, A, B, C, and D. Methods A
and board. Contamination of material by water from the
and B for thin paper and dense materials, respectively, are
surroundings during sampling and handling may be both rapid
manual methods for solvent extraction of water from the
and significant in the case of dry test specimens. This is an even
specimens. Titration is used to determine the amount of water.
greater concern with cellulose insulation prior to oil impreg-
Method C uses automatic titration to determine the amount of
nation.
water. Method D is a direct automated method for extraction
and detection of the water.
5. Apparatus
1.3 This standard does not purport to address all of the
5.1 Karl Fischer Electrometric Titration Apparatus.
safety concerns, if any, associated with its use. It is the
5.2 Magnetic Stirrer and TFE-Fluorocarbon Coated Stir-
responsibility of the user of this standard to establish appro-
ring Bars.
priate safety and health practices and determine the applica-
5.3 Erlenmeyer Flasks, glass-stoppered, 250-mL.
bility of regulatory limitations prior to use.
5.4 Graduate, glass, 100-mL.
2. Referenced Documents 5.5 Büchner Funnel, small porcelain.
5.6 Micro-Syringe, total capacity 0.2 mL, 0.01-mL divi-
2.1 ASTM Standards:
sions.
D 1533 Test Methods for Water in Insulating Liquids (Karl
2
5.7 Blender, industrial type.
Fischer Reaction Method)
5.8 Syringe, 10 mL, ground glass.
3. Summary of Test Methods
5.9 Drying Oven,1106 5°C.
5.10 Laboratory Desiccator.
3.1 These test methods depend on solvent extraction of the
5.11 Analytical Balance.
moisture at room temperature and Karl Fischer titration (see
Test Methods D 1533). For paper insulation 0.010 in. (0.25
6. Reagents
mm) thick and less, extraction is accomplished by stirring the
6.1 Karl Fischer Reagent—Commercially available stabi-
solvent with small pieces of insulation. In the special case of
lized solution, diluted from approximately 5 mg of water per 1
dense, thick sections, such as pressboard, the extraction rate is
mL to 2.5 to 3.0 mg of water per 1 mL by adding absolute
increased by delaminating thick sections and pulping the
acetone-free methanol (Methods A and B). For Methods C and
sample in a blender.
D, prepare commercially available solutions for use in auto-
4. Significance and Use
matic titrators in accordance with the manufacturer’s instruc-
tions.
4.1 Moisture has an adverse effect on the dielectric strength,
6.2 Titration Solvent—Mix 2 volumes of acetone-free
dielectric loss, d-c resistivity, and aging characteristics of
methanol and 1 volume of dry chloroform. Keep the solution
oil-impregnated cellulosic insulating materials.
tightly capped to prevent moisture absorption from the atmo-
1 sphere.
These test methods are under the jurisdiction of ASTM Committee D-27 on
Electrical Insulating Liquids and Gasesand are the direct responsibility of Subcom- 6.3 Purity of Reagents—Use reagent grade chemicals in all
mittee D27.06on Chemical Test.
tests. Unless otherwise indicated, it is intended that all reagents
Current edition approved June 15, 1995. Published August 1995. Originally
shall conform to the Committee on Analytical Reagents of the
published as D 3277 – 73. Last previous edition D 3277 – 94.
2
American Chemical Society, where such specifications are
Annual Book of ASTM Standards, Vol 10.03.
Copyright © ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959, United States.
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D 3277
available. Other grades may be used, provided that it is first reagent (grams of water per millilitre of Karl Fischer reagent)
ascertained that t
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