Apparatus and method for cooling electrical transformers
First Claim
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1. A transformer assembly, comprising:
- a transformer;
a thermal sensing and control device in thermal communication with the transformer;
a cooling device in signal communication with the thermal sensing and control device, and arranged for cooling the transformer on command; and
an electrical disconnect device in signal communication with the thermal sensing and control device, and arranged for disconnecting the transformer from a source of electrical power on command;
wherein the cooling device is responsive to a first signal from the thermal sensing and control device, and the electrical disconnect is responsive to a second signal from the thermal sensing and control device.
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Abstract
A transformer assembly includes a transformer having a winding, a thermal sensor in thermal communication with the transformer winding, and an airflow generator in signal communication with the thermal sensor and arranged for fluid communication with the transformer winding. The airflow generator is responsive to the thermal sensor to direct an airflow toward the transformer winding in response to a temperature at the winding.
11 Citations
28 Claims
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1. A transformer assembly, comprising:
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a transformer; a thermal sensing and control device in thermal communication with the transformer; a cooling device in signal communication with the thermal sensing and control device, and arranged for cooling the transformer on command; and an electrical disconnect device in signal communication with the thermal sensing and control device, and arranged for disconnecting the transformer from a source of electrical power on command; wherein the cooling device is responsive to a first signal from the thermal sensing and control device, and the electrical disconnect is responsive to a second signal from the thermal sensing and control device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A transformer assembly, comprising:
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a three-phase dry-type transformer having at each phase a primary winding with a primary connection and a secondary winding with a secondary connection; a first, second, and third thermal switch at each phase in thermal communication with the respective primary winding, secondary winding, or combination thereof; and a fan at each phase in signal communication with the respective first thermal switch, and arranged for fluid communication with the respective primary winding, secondary winding, or combination thereof; wherein each fan is responsive to the respective first thermal switch for directing an airflow toward the respective primary winding, secondary winding, or combination thereof, in response to a respective winding temperature being in excess of a first temperature threshold; wherein the second thermal switch at each phase is arranged to provide a signal indicative of a respective winding temperature being in excess of a second temperature threshold; wherein the third thermal switch at each phase is arranged to provide a signal indicative of a respective winding temperature being in excess of a third temperature threshold; wherein the first temperature threshold is less than the second temperature threshold, and the second temperature threshold is less than the third temperature threshold. - View Dependent Claims (17)
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18. A transformer assembly, comprising:
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a transformer, a sensor in signal communication with the transformer for sensing an operating characteristic thereof; another sensor in signal communication with the transformer, the another sensor arranged for signal communication with an electrical disconnect device; and an airflow generator in signal communication with the sensor and arranged for fluid communication with the transformer; wherein the airflow generator is responsive to the sensor for directing an airflow toward the transformer in response to the sensed operating characteristic being desirous of an airflow at the transformer. - View Dependent Claims (19, 20, 21, 22)
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23. A method of operating a transformer assembly, the assembly comprising a transformer, a thermal sensing and control device in thermal communication with the transformer, a cooling device in signal communication with the thermal sensing and control device, and arranged for cooling the transformer on command, and an electrical disconnect device in signal communication with the thermal sensing and control device, and arranged for disconnecting the transformer from a source of electrical power on command, the method comprising:
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receiving a first signal from the thermal sensing and control device, and operating the cooling device in response thereto; and receiving a second signal front the thermal sensing and control device, and operating the electrical disconnect device in response thereto. - View Dependent Claims (24, 25, 26, 27, 28)
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Specification