Abstract
4 units differential equations were introduced to propose individual loading guide instead of established loading guide in the previous paper. This paper showed how to determine the coefficients of the equations above mentioned by using the manufacturers examination reports of each transformer and further, to regulate the coefficients by the field measurement data.
But, for on-load tap-changing transformers (especially distribution transformers), tap position is continuously changing during load cycle, therefore primary resistances and stray load loss shall also change accompanied with this phenomenon. Therefore tap changing facility should be added to the equations to make individual loading guide more reliable and accurate than the before. To realize mathematical method, impedance test examination in each manufacturer examination reports are also used to assume primary leakage inductances, second leakage inductances and the mutual inductances.
In this paper, the method of how to detect the position of tap changer and the comparison between the calculation results of established loading guide and proposing individual loading guide shall be showed, thereafter consider the overall results.
