CirculatingCurrent–loadswitchopen-Welcome循环电流–负荷开关开欢迎

Click to edit Master title style,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,*,*,*,Circulating Current load switch open,Circulating Current load switch closed,I,circulating,adds to the load current in one transformer and subtracts from the load current in the other transformer.At rated load,the transformer with the higher secondary voltage will be,overloaded,!,Example 3.4,Two 100 kVA single-phase transformers A and B are to be operated in parallel.The respective no-load voltage ratios and respective impedances are obtained from the nameplates as,Transformer A,2300 460 V%R=1.36%X=3.50,Transformer B,2300 450%R=1.40%X=3.32,Example 3.4 continued,Determine,the circulating current in the paralleled secondaries,the circulating current as a percent of the rated current in transformer A,the percent difference in secondary voltage that caused the circulating current.,The rated low-side currents are,The equivalent resistance and reactance of each transformer referred to the low side,The impedance of the closed loop formed by the two secondaries,The circulating current,The circulating current as a percent of the rated current in transformer A,The percent difference in secondary voltage that caused the circulating current,