Importance

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Abstract

A method and system is provided for electronically simulating, indicating and controlling the temperature of liquid cooled multi-phase electric power transformers. The temperatures of transformer windings are electronically computed from the actual top oil temperature and the computed incremental additional temperatures resulting from the transformer winding currents to determine the hottest spot temperature. The signals representative of the winding current for each phase of the multi-phase transformer are time processed to simulate the rate of rise of winding temperature resulting from those currents. A square-law function is generated to make a winding bias parameter for each winding. The signals representative of the actual and incremental additional temperature are added for each transformer phase and the largest signal, representative of the hottest winding is used to indicate and control the transformer temperature.

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First Claim