主权项 |
1. A method for calculating the thermal characteristics in a power transformer, the method comprising:
executing a mathematical model for determining a thermal performance of a power transformer, the mathematical model including a plurality of variables; calculating a theoretical oil temperature associated with operation of the power transformer at a first time by executing the mathematical model; collecting an actual oil temperature during operation of the power transformer at a second time; calculating a temperature error between the calculated and the collected oil temperatures; calculating a time error between the first and second times; and determining a difference between a limit and at least one of the temperature error and the time error and, if at least one of the differences is greater than the limit, calculating a change in a variable of the mathematical model, the variable representing at least one of an oil rise value, an oil exponent, and an oil time constant associated with calculating the theoretical oil temperature, and repeating the steps of executing the mathematical model using the changed variable, calculating the theoretical oil temperature associated with operation of the power transformer at a subsequent first time by executing the mathematical model, calculating the temperature error between the calculated and the collected oil temperatures, calculating a time error between the subsequent first time and a subsequent second time, and determining the difference between the limit and at least one of the temperature error and the time error until the difference is within the limit. |