电机学电机学电机学 (3).ppt

Electrical Machinery03Transformer Model and Rated ValueModel indicates the structure,rated capacity,voltage class,cooling mode etc,and they are expressed in this way:1.Power Transformer ModelsWinding coupling methodNumber of phasesCooling methodNumber of windingsWinding conductor materialVoltage regulating modeRated capacityRated voltage class of high voltage side(KV)SL-500/10It refers to the power transformer:three-phase,oil-immersed self cooling,double coils,aluminum wire,rated capacity 500kVA,rated voltage on the high voltage side,10kV.Exercises:SFPL-6300/110SSPSL-180000/220 1.Power Transformer Models2.Rated ValueRated Capacity SNRated Capacity SNApparent power when in rated operation.Expressed with VA,kVA and MVA.Rated VoltageU1N and U2NRated Current I1N,I2N Rated Frequency fN2.Rated ValueRated Capacity SNRated Voltage U1N,U2NThe terminal voltage which is applied to the primary side for normal operation is called the primary rated voltage UlN of a transformer.The secondary rated voltage U2N refers to the no-load voltage of the secondary side when the primary side is under the rated voltage.For a three-phase power transformer,rated voltage refers to the line voltage.Rated VoltageU1N and U2NRated Current I1N,I2NRated Frequency fN2.Rated ValueRated Capacity SNRated Current I1N,I2NThey are the line currents calculated out according to rated capacity and rated voltage,(unit:A)Rated VoltageU1N and U2NRated Current I1N,I2NRated Frequency fN2.Rated ValueRated Capacity SNRated Frequency fNOur country stipulates the industrial frequency 50Hz.Rated VoltageU1N and U2NRated Current I1N,I2NRated Frequency fN2.Rated ValueSingle-Phase TransformerThree-Phase Transformer THANKS FOR WATCHING!