继电保护原理与应用(第三版)3.1-3.5(23)

This same technique of applying voltage drops to Figure 3.6b shows that for this three-phase bank connection the voltage-drop polarity to nonpolarity or phase a to n is in phase with the voltage-drop polarity to nonpolarity or phase A to phase C. Similarly, voltage-drop across phase b to n is in phase with voltage-drop phase B to phase A, and voltage-drop phase c to n is in phase with voltage-drop across phase C to phase B. By comparing similar voltages on the two sides of the transformer, phase-A-to-neutral voltage drop leads the phase-a-to-n voltage drop by 308, so the delta winding would be the highvoltage side if this is an ANSI=IEEE standard transformer bank. This technique is very useful to make the proper three-phase transformer connections from a desired or known voltage diagram or phase-shift requirement. It is a very powerful tool, which is simple and straightforward.
图3.6b中施加电压降的相同技术表明，对于这种三相组连接，电压降极性到非极性或相位a到n与电压降极性到非极性或相位a到相位C同相。同样，相位b到n的电压降与电压降相位b到相位a同相，相c到n的电压降与相c到相B的电压降同相。通过比较变压器两侧的相似电压，相A到中性点的电压降导致相A到n的电压降308，因此如果这是ANSI=IEEE标准变压器组，三角形绕组将是高压侧。这种技术对于根据所需或已知的电压图或相移要求进行适当的三相变压器连接非常有用。它是一个非常强大的工具，简单明了。