Research on Calibration Method Voltage Error of Yy0 Connection Mode Three-Phase Three-element Combined Transformer
Ren Lindong1, Liu Gang2, Lei Guoci3
1. College of Electrical Engineering Guizhou University, Guiyang 550000; 2. State Grid Sichuan Energy Company Metering Center, Chengdu 610000; 3. University of Electronic Science and Technology of China, Chengdu 610000
Abstract：At present, three-phase combined transformer has been in the domestic power grid for large users and a large number of special variable for energy metering, the quality of its performance is directly related to the quality of electric energy metering accuracy. Three-phase three-element combined transformer is widely used in 10kV, 35kV high voltage transmission system, it has not occurred can measure voltage, grounding fault occurs when the iron magnetic oscillation which should not occur in damage to the equipment, has the advantages of good anti stealing electricity capacity and so on. It rules three-phase combined transformer should be calibrated with three-phase method, but the majority of metrology department is still the single-phase method. Based on the mechanism of the error of the three-phase transformer, take Yy0 connection three-phase three-element combined transformer calibrate by two methods, the results show that the single-phase method has obvious voltage error in the test of Yy0 connection mode of three-phase combined transformer. It needs to use three-phase method to carry out the inspection work of three-phase combined transformer.
2015, Vol. 16 
