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Transformer Oil Gas Analyzer (TOGA) GC System - SRI Instruments
Transformer Oil Gas Analyzer (TOGA) GC System -
DISCONTINUED
10-11
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HID, FID and/or TCD Detectors
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Built-in PeakSimple Data System
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Built-in Standards Preparation Module
Make
Your Own Standards
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Dual 10-port Gas Sampling Valves
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Gas Extraction Loop
...on the compact
chassis
By analyzing the gases dissolved in transformer oil, potential
transformer faults can be avoided. ASTM D3612 provides for
identification and quantification of dissolved gases
intransformer oil by GC. The SRI TOGA GC uses the version
referred to as D3612B, the direct injection technique where the
dissolved gas extraction takes place inside the GC. This
means that other than collecting the transformer oil in a glass
airtight syringe, no sample preparation is necessary prior to
injection into the TOGA GC. This helps to avoid contamination
made possible by transferring the sample between various
containers.
The presence and quantities of certain gases in
the transformer oil indicate four broad types of
possible general fault conditions:
1-
Transformer oil overheating:
methane,
ethane, ethylene, and small quantities of
acetylene
2-
Partial Discharge:
hydrogen, methane, and
small quantities of acetylene and ethane
3-
Sustained Arcing:
hydrogen, acetylene, and
ethylene
4-
Insulating Paper Overheating:
carbon
monoxide and carbon dioxide
To achieve these chromatograms, a transformer oil standard was pumped through the gas extraction loop of a TOGA
GC equipped with HID and TCD detectors. The TCD was used to quantify the oxygen and nitrogen because the HID is
too sensitive for the large quantities typically found dissolved in transformer oil.
Concentration by Weight:
Hydrogen 10.7ppb
Oxygen 25.74ppm