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US 4,394,635 AGranted
Method for determining dissolved gas concentrations in dielectric coolants
AssigneeGeneral Electric Company
InventorStephen D. Foss
Life of this patent
Estimating the term…
Abstract
The quantity of SF.sub.6 gas dissolved in a halogenated dielectric coolant used in transformers can be determined by heating a sample quantity of the sample gas coolant to the point of cavitation and comparing the temperature and pressure at which cavitation first appears to a graphic representation of the relationship between concentration, pressure and temperature to obtain the gas concentration from the observed temperature point.
Claims12
A power transformer comprising, in combination:
- a transformer tank containing a non-condensable gas and a liquid;
- a transformer core and winding disposed within said tank in thermally coupled relation with the liquid;
- a sight glass in fluid flow relation with the interior of said tank for containing an observable sample of the liquid;
- heater means in thermal relation with said sight glass for heating the liquid sample to cavitation;
- pressure indicating means coupled with said tank for determining the pressure of the liquid sample;
- and
- temperature indicating means proximate said sight glass for determining the temperature of the liquid sample;
- whereby the concentration of the non-condensable gas dissolved in the liquid can be determined by noting the temperature and pressure of the liquid sample at the onset of cavitation.
5 more elements
A gas-insulated transformer comprising:
- a transformer tank containing a noncondensable gas for use as a dielectric insulating medium;
- a plurality of transformer windings arranged around a transformer core within said tank;
- a plurality of tubes extending through said windings and containing a liquid coolant for cooling said winding during transformer operation;
- piping means connecting with said coolant tubes and with a heat exchanger for carrying said coolant to said heat exchanger and removing heat from said coolant;
- a sight glass connected with said piping means for observing a sample of said coolant within said piping means;
- a pressure indicating means connected with said piping means for determining said coolant pressure;
- heater means in thermal contact with said sight glass for heating said coolant to cavitation within said sight glass;
- and
- temperature indicating means thermally proximate said sight glass for indicating the temperature of coolant within said sight glass.
6 more elements
A vaporization cooled transformer comprising:
- a transformer tank containing a condensable liquid coolant;
- a transformer core and winding within said tank for contact with said coolant;
- a heat exchanger connected with said tank for receiving said coolant in vaporized form and returning said coolant in condensed form;
- an expansion tank connected with said transformer for isolating said noncondensable gas from said coolant during transformer operation;
- a sight glass connected with said tank for providing visual access to said coolant;
- heater means in thermal relation with said sight glass for heating said coolant to cavitation;
- pressure indicating means connected with said transformer for determining said coolant pressure;
- and
- temperature indicating means thermally proximate said sight glass for determining the temperature of said coolant.
6 more elements
Dependencies are inferred from the claim text.