D6180-98(2004) Standard Test Method for Stability of Insulating Oils of Petroleum Origin Under Electrical Discharge

Developed by Subcommittee: D27.05
See Related Work by this Subcommittee
Adoptions: Book of Standards Volume: 10.03


1. Scope

1.1 This test method covers a laboratory technique that measures the stability of new, used, or reclaimed insulating oils, similar to those described in Specification D 3487 in the presence of a controlled electric discharge. When subjected to this type of discharge, insulating oils absorb energy and produce gases as well as ionized molecules (charge carriers). The quantity of these decay products can be measured and can provide an indication of the stability of oils under the conditions of this test.

1.2 The gases are retained in the discharge cell and their pressure measured. The charge carriers remain in the test specimen. The change in the dissipation factor before and after the discharge is determined.

1.3 The values stated in SI units are to be regarded as the standard. The values stated in parentheses are for information only.

1.4 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. Specific cautionary statements are given in and .

2. Referenced Documents

D923 Practice for Sampling Electrical Insulating Liquids
D924 Test Method for Dissipation Factor (or Power Factor) and Relative Permittivity (Dielectric Constant) of Electrical Insulating Liquids
D3487 Specification for Mineral Insulating Oil Used in Electrical Apparatus 4-1995 IEEE Standard Techniques for High-Voltage Testing

  D6181-03 Standard Test Method for Measurement of Turbidity in Mineral Insulating Oil of Petroleum Origin

Developed by Subcommittee: D27.07
See Related Work by this Subcommittee
Adoptions: Book of Standards Volume: 10.03


1. Scope

1.1 This test method covers the laboratory procedure that ascertains the quantity of suspensions in insulating oils of petroleum origin using a nephelometric measurement technique to determine the fluid's turbidity. This test method is designed to reveal changes that may occur to these oils.

1.2 This test method is applicable for turbidities in the range of 0.1 to 500 Nephelometric Turbidity Units (NTU).

1.3 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.

1.4 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.

2. Referenced Documents

D923 Test Method for Sampling Electrical Insulating Liquids
D1533 Test Methods for Water in Insulating Liquids (Karl Fischer Reaction Method)
D1698 Test Method for Sediments and Soluble Sludge in Service Aged Insulating Oils
D1889 Test Method for Turbidity of Water
D4652 Specification for Silicone Fluid Used for Electrical Insulation
D5180 Test Method for Quantitative Test for Turbidity in Clear Liquids
E177 Practice for Use of the Terms Precision and Bias in ASTM Test Methods

  D6802-02 Test Method for Determination of the Relative Content Of Dissolved Decay Products in Mineral Insulating Oils by Spectrophotometry

Developed by Subcommittee: D27.03
See Related Work by this Subcommittee
Adoptions: Book of Standards Volume: 10.03


1. Scope

1.1 This test method characterizes by spectrophotometry the relative level of dissolved decay products in mineral insulating oils of petroleum origin. While new oil is almost transparent to a monochromatic beam of light in the visible spectrum, the increasing concentration of dissolved decay products shift the absorbance curve to longer wavelengths.

1.2 This test method is applicable to compare the extent of dissolved decay products for oils in service. It can assess the effectiveness of used or stored oil purification during the reclamation process, as well.

1.3 The values stated in SI units are to be regarded as standard. The values stated in parentheses are provided for information only.

1.4 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 to determine the applicability of regulatory limitations prior to use.

2. Referenced Documents

D923 Practices for Sampling Electrical Insulating Liquids
D1524 Test Method for Visual Examination of Used Electrical Insulating Oils of Petroleum Origin in the Field
D3487 Specification for Mineral Insulating Oil Used in Electrical Apparatus