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US 5,502,435 AGranted
Method and system for monitoring circuit breaker gas pressure
OwnerDouglas E. Ralstoninventor
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OwnerDouglas E. Ralstoninventor
Estimating the term…
A method and system are provided for monitoring the pressure of gas in a gas filled circuit breaker container based on a temperature compensated gas pressure signal which is compared with a signal representing a desired gas pressure in the container to provide a signal indicating a gas leak when the actual pressure is less than the desired pressure. In addition to identifying a gas leak, the method and system is operable to deactivate the circuit breaker when the actual pressure decreases below a predetermined low pressure, to determine the gas leak rate and to deactivate the circuit breaker if the leak rate is greater than a predetermined acceptable rate and, otherwise, to determine the time required for the pressure to decrease to the unacceptable low pressure, and to activate an alarm, visual display and/or recording of information in response to certain detected conditions with respect to the gas pressure.
A system for monitoring the pressure of gas in a gas filled circuit breaker container in which said gas has a pressure and a temperature comprising, means for producing a first signal representative of a temperature compensated gas pressure in said container, means for providing a second signal representative of a reference gas pressure in said container, comparator means including means for comparing said first and second signals and providing a third signal in response to said first signal being less than said second signal, thus indicating a drop in pressure in said container from said reference pressure, and means responsive to said third signal including means for indicating said pressure drop.
A system for monitoring the pressure of gas in a gas filled circuit breaker container in which said gas has a pressure and a temperature comprising, means for producing a first signal representative of a temperature compensated gas pressure in said container, means for providing a second signal representative of a reference gas pressure in said container, comparator means including means for comparing said first and second signals and providing a third signal in response to said first signal being less than said second signal, thus indicating a drop in pressure in said container from said reference pressure, and means responsive to said third signal including means for indicating said pressure drop, said means responsive to said third signal further including means for producing a leak rate signal representative of the rate of said pressure drop in said container.
A system for monitoring the pressure of gas in a gas filled circuit breaker container in which said gas has a pressure and a temperature comprising, means for producing a first signal representative of a temperature compensated gas pressure in said container, means for providing a second signal representative of a reference gas pressure in said container, comparator means including means for comparing said first and second signals and providing a third signal in response to said first signal being less than said second signal, thus indicating a drop in pressure in said container from said reference pressure, means responsive to said third signal including means for indicating said pressure drop, means for providing a low pressure reference signal representative of a minimum acceptable pressure in said container lower than said reference pressure, said comparator means further including means for comparing said first signal and said low pressure reference signal and providing a control signal in response to a drop in pressure in said container below said minimum acceptable pressure, means responsive to said control signal for indicating that the pressure in said container is below said minimum acceptable pressure, said means responsive to said third signal including means for producing a leak rate signal representative of the rate of said pressure drop in said container, and means responsive to said leak rate signal for indicating said rate of pressure drop.
A method of monitoring the pressure of gas in a gas filled circuit breaker container in which said gas has a pressure and a temperature comprising, determining a temperature compensated pressure of the gas in said container, comparing said temperature compensated pressure with a first reference pressure representing a predetermined pressure for said gas in said container to detect a pressure drop in said container, comparing said temperature compensated pressure with a second reference pressure representing a minimum acceptable pressure in said container, and disabling said circuit breaker at least in response to said temperature compensated pressure being less than said second reference pressure.
A method of monitoring the pressure of gas in a gas filled circuit breaker container in which said gas has a pressure and a temperature comprising, determining a temperature compensated pressure of the gas in said container, comparing said temperature compensated pressure with a first reference pressure representing a predetermined pressure for said gas in said container to detect a pressure drop in said container, comparing said temperature compensated pressure with a second reference pressure representing a minimum acceptable pressure in said container, and disabling said circuit breaker at least in response to said temperature compensated pressure being less than said second reference pressure, and determining the rate of pressure drop when said temperature compensated pressure is less than said first reference pressure.
Dependencies are inferred from the claim text.