ASTM D 7150 Standard Test Method for the Determination of Gassing Characteristics of Insulating Liquids Under Thermal Stress at Low Temperature
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ASTM D 7150 Document Information:
Title
Standard Test Method for the Determination of Gassing Characteristics of Insulating Liquids Under Thermal Stress at Low Temperature
ASTM International
Publication Date:
May 1, 2005
Scope:
This test method describes the procedures to determine the low
temperature (120°C) gassing
characteristics of insulating liquids specifically and without the
influence of other electrical
apparatus materials or electrical stresses. This test method was
primarily designed for insulating
mineral oil. It can be applied to other insulating liquids in which
dissolved gas-in-oil analysis
(Test Method D 3612) is commonly performed.
This test method is particularly suited for detection of the
phenomenon sometimes known as "stray
gassing" and is also referred to in CIGRE TF11 B39.
This test method is performed on transformer insulating liquids to
determine the propensity of the
oil to produce certain gases such as hydrogen and hydrocarbons at low
temperatures.
This test method details two procedures:
Method A describes the procedure for determining the gassing
characteristics of a new, unused
insulating liquid, as received, at 120°C for 164 h.
Method B describes the procedure for processing the insulating liquid
through an attapulgite clay
column to remove organic contaminants and other reactive groups that
may influence the gassing
behavior of an insulating liquid, which is suspected of being
contaminated. This procedure applies
to both new and used insulating liquids.
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.
Keywords:
- combustible gases
- DGA
- dissolved gases
- dissolved gas-in-oil
- insulating oil
- low temperature gassing characteristics
- stray gassing
- transformer oil, clay treatment
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