System and method for reducing the temperature of a refrigerant that flows through a power transformer cooling system

摘要

"SYSTEM AND METHOD TO REDUCE THE TEMPERATURE OF A REFRIGERANT THAT FLOWS THROUGH A POWER TRANSFORMER REFRIGERATION SYSTEM". A system (27) for reducing the temperature of the refrigerant oil to a power transformer (12) includes a heat exchanger (44) interposed in the refrigerant oil system. The heat exchanger (44) depends on the exchange of liquid for heat liquid from the heated oil to a refrigerant which flows through the heat exchanger. In one embodiment, the refrigerant supplied to the heat exchanger is obtained from an absorption cooler (65). Thermal energy is supplied to the chiller (65) from a heat storage device (80). In a specific embodiment, the heat storage source (80) can be a device of phase-changing material. In a preferred cooling system, a programmable controller (55) determines the activation and operation of the system. The controller (55) can detect the temperature of the refrigerant or transformer to trigger the activation. In a preferred embodiment, the controller (55) compares the current temperature history with a temperature profile to provide for greater cooling requirements. In a given embodiment, excess, off-peak or residual heat from the transformer itself (12) is supplied to the heat storage device (80) or to the phase change heat exchanger.