继电保护原理与应用(第三版)3.1-3.5(8)

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3.2.4 Phasor Diagrams Require a Circuit Diagram相量图需要电路图
The phasor diagram, defined earlier, has an indeterminate or vague meaning unless it is accompanied by a circuit diagram. The circuit diagram identifies the specific circuit involved, with the location and assumed direction for the currents, and the location and assumed polarity for the voltages to be documented in the phasor diagram. The assumed directions and polarities are not critical, because the phasor diagram will confirm if the assumptions are correct, and provide the correct magnitudes and phase relations. These two complementary diagrams (circuit and phasor) are preferably kept separate to avoid confusion and errors in interpretation. This is discussed further in Section 3.3.
先前定义的相量图具有不确定或模糊的含义，除非附有电路图。电路图确定了所涉及的具体电路，包括电流的位置和假定方向，以及要记录在相量图中的电压的位置和假定极性。假设的方向和极性并不重要，因为相量图将确认假设是否正确，并提供正确的量级和相位关系。最好将这两个互补图（电路和相量）分开，以避免混淆和解释错误。这将在第3.3节中进一步讨论。