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The
Portable Fault Gas
Detector provides a sensitive and effective means for detecting faults
in electrical transformers having gas space above the insulating oil.
It makes available an important means to improve the continuity of
electrical service. Gas samples can be taken without de-energizing or
disturbing the operation of the transformer in any way.
The
Portable Fault Gas
Detector employs the heat of combustion of flammable gases to measure
the quantity of these in the gas sample. The measuring filaments
consist of two small separately housed platinum coils heated by an
electrical current. A mixture of the sample flammable gas and air is
brought into contact with one of the coils, allowing a rapid catalytic
combustion to take place at the surface of the filament. This burning
of the combustible gas increases the temperature of the filament,
causing a proportional change in its resistance. The second filament is
heated in a neutral atmosphere of air and serves as a reference or
standard. While it responds to any combustible gas, it has been
calibrated to indicate very closely the total percentage of combustible
gases in a transformer gas space produced by fault conditions.
The
Portable Fault Gas
Detector may be used in the field or in the laboratory. In the field,
it is connected directly to the transformer gas space. In the
laboratory, sampling cylinders supply gas samples taken from
transformers in the field.
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