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1、Electrical MachinerySame-polarity terminals and symbols of start terminal and end terminal3.1.3 Same-polarity terminalSame-polarity terminals:the terminals whose instant polarities are same in terms of two windings linking with the same magnetic flux.3.1.4 Marking of start terminal and end terminal
2、of the winding and the Influence of same-polarity terminals on phase relation of high-voltage and low-voltage windings CoilNameSingle-Phase TransformerThree-Phase TransformerStart terminalEnd terminalStart terminalEnd terminalMidpointHigh voltageWindingAXA,B,CX,Y,ZNLow voltageWindingaxa,b,cx,y,zn3.1
3、.4 Marking of start terminal and end terminal of the winding and the influence of same-polarity terminals on phase relation of high-voltage and low-voltage windings The rule of positive direction of winding phase electromotive force:from start terminal to end terminal.For example,the positive direct
4、ion of electromotive force of A phase is from A to X,and the phase electromotive force is expressed with EAX,shortly written as EA.1.When the start terminals of the high-voltage winding and low-voltage winding linking with the same magnetic flux are same name terminals3.1.4 Marking of start terminal
5、 and end terminal of the winding and the influence of same-polarity terminals on phase relation of high-voltage and low-voltage windings 2.When the start terminals of the high-voltage winding and low-voltage winding linking with the same magnetic flux are different name terminalsTHANKS FOR WATCHING!