Abstract：In view of the conventional calibration method of the power transformer steady-state ratio differential protection coefficient has the shortcomings of large computation, error-proneness and time-consuming, a novel calibration method by changing the current phase on either side of the main transformer to gain the differential current which can search the precise action point is proposed. The method has the advantages of small computation, easy operation and saving time. Taking the RCS-978G transformer as the test object, the magnitude adjustment, phase adjustment and zero elimination the of differential protection are analyzed. The test steps of the amplitude method are summarized. The principle and test method of the proposed phase method are given. Finally, the practical applications of the amplitude method and phase method are compared and analyzed. The results show that the phase method takes the obvious advantages in measuring accuracy and test time-consuming, and has the highly promotional value.
王海波. 一种新型变压器稳态比率差动保护系数校验方法[J]. 电气技术, 2022, 23(10): 80-85.
WANG Haibo. A novel calibration method of steady-state ratio differential protection coefficient for transformer. Electrical Engineering, 2022, 23(10): 80-85.
2022, Vol. 23 
