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May 26 Read May 25 Read May 14 Read May 13 Read Apr 30 Read Jan 17 Read May 07 Read Apr 29 Read May 28 Read May 11 Read Jun 02 Read Sep 24 Read Times. Insulating fluids, generally mineral oils, are used in transformers. Under normal operating conditions, there is very little decomposition. However, occasionally localised or general heating of the oil occurs and decomposition products are formed.
If the concentration of these dissolved gases reach a critical point, the chances of catastrophic transformer failure increase. ASTM D describes in detail three different methods for transformer gas analysis. The three different routes for analysis are vacuum extraction, headspace analysis and stripper column analysis. The oil sample is introduced to the stripper column via a syringe infusion pump. Any dissolved gases are then extracted from the oil sample by sparging carrier gas through the stripper column.
The analytical system was calibrated using a low-level reference gas mixture sample. Through the use of a syringe infusion pump, an oil sample was injected via two ten-port valves each equipped with sample loops connected to the stripper columns. One channel is equipped with two molsieve columns using argon as the carrier gas.
The column is optimised to separate lighter gases such as hydrogen, oxygen and nitrogen. The other channel is equipped with PoraPlot columns with helium as the carrier gas. This channel is used to separate carbon gases including carbon monoxide and carbon dioxide. The schematic configuration of the TOGA analyser stripper column configuration is shown in Figure 1 with the analytical conditions detailed in Table 1.
As can be expected, the results obtained from the stripper column configuration are very similar to the headspace configuration. ASTM D specifies that when using a stripper column configuration, the instrument must be sensitive enough to detect hydrogen at least 20ppm with the atmospheric gases at ppm.
Repeatability testing was performed using three injections of the same oil sample on both the stripper column analyser and the headspace analyser. A comparison of repeatability values can be found in Table 2. This novel stripper column technique for TOGA analysis simplifies instrumental configuration by eliminating the headspace sampler. It reduces sample preparation time and cost, is more efficient in both bench space. Do you like or dislike what you have read?
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A decade of improved safety from stalwart gas detector Jun 02 Read Free to read This article has been unlocked and is ready to read. Instrumental The oil sample is introduced to the stripper column via a syringe infusion pump. Results As can be expected, the results obtained from the stripper column configuration are very similar to the headspace configuration.
Reader comments Do you like or dislike what you have read? Post a Comment First Name. Last Name. Analytical Instrumentation Insulating fluids, generally mineral oils, are used in transformers. How to truly determine the water content to 1 p Surplus volumes amid global drop in oil demand Digital Edition.
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Historical Version s - view previous versions of standard. Work Item s - proposed revisions of this standard. More D The nature and amount of the individual component gases that may be recovered and analyzed may be indicative of the type and degree of the abnormality responsible for the gas generation. The rate of gas generation and changes in concentration of specific gases over time are also used to evaluate the condition of the electric apparatus. Other methods have been used to perform this analysis.
A novel technology for transformer oil gas analysis using a stripper column (ASTM D3612)
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ASTM D 3612 – 02 pdf free download
Designation: D — 02 Reapproved Standard Test Method for. A number in parentheses indicates the y ear of last rea pp roval. Other methods have been used to perform this analysis. It is the responsibility of the user of this standard to establish appro- priate safety and health practices and determine the applica- bility of regulatory limitations prior to use. Ref erenced Documents.