| 摘要 |
A system ( 27 ) for reducing the temperature of cooling oil for a power transformer ( 12 ) includes a heat exchanger ( 44 ) interposed in the cooling oil system. The heat exchanger ( 44 ) relies upon a liquid-to-liquid exchange of heat from the heated oil to a coolant flowing through the heat exchanger. In one embodiment, the coolant provided to the heat exchanger is obtained from an absorption chiller ( 65 ). Heat energy is provided to the chiller ( 65 ) from a heat storage device ( 80 ). In a specific embodiment, the heat storage source ( 80 ) can be a phase change material device. In a preferred cooling system, a programmable controller ( 55 ) determines the activation and operation of the system. The controller ( 55 ) can sense transformer or cooling oil temperature to trigger activation. In a preferred embodiment, the controller ( 55 ) compares a current temperature history against a temperature profile to anticipate increased cooling requirements. In certain embodiment, excess, off-peak or waste heat from the transformer ( 12 ) itself is provided to the heat storage device ( 80 ) or to the phase change heat exchanger.
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