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The on-load tests are carried out on an experimental power system, where the 20 kVA superconducting synchronous generator is connected to the regional power system through reactors (artificial transmission lines). The cooling characteristics of the rotor, especially, the cold damper, are obtained. On the on-load tests, active power vs. reactive power, active power vs. load angle, field current vs. active power characteristics at the constant terminal voltage, and so on are obtained. The transient behavior of the generator for a small variation of the input power is obtained. A transient analysis for the above test was carried out. Good agreement between the measured and calculated values is confirmed. From the results, the characteristics of superconducting generators are compared with those of the conventional ones and discussed.