Loss estimated methods in transmission line of northeastern transmission system

摘要

Normally, the electrical power loss in transmission line can be determine in several method but this methodproposes a power loss calculation through the current squared and multiplies by resistance (3I2R). The electricalcurrent number is derived from the result of power divide by voltage, In order to get the electrical current numberflowing in individual transmission line, the data can be retrieved from the EGAT SCADA of Northeastern power system center. The data which includes voltage, real power and appearance power will be used to estimate theloss of the power system there are totally 127 power circuits and 50 stations. The calculation data calculate useevery 30 minutes from January to May 2011. By this way, the actual power loss from individual lines can beproperly determined for further loss improvement opportunity. This power loss calculation is evaluated by comparingwith another two methods. The simulation test is done by disconnected some transmission lines which are significantimpact to the whole system. As the result of testing, the proposed power loss calculation method 3 is equal 85.58MW, method 2 is equal 85.83 MW and method 1 is equal 90.32 MW. From the comparison, method 3 and 2 areclose to the same value about 3 MW at that time. The method 3 and 2 are different from the method 1 in case ofa small power loss deviation from the last value.