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Additional resources for Ieee Std c57.12.70-2000 (Ieee Standard Terminal Markings And Connections For Distribution And Power Transformers)

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From X2 toward neutral Copyright © 2001 IEEE. All rights reserved. , from X6 toward neutral See Figure 23(e). A tap from the middle point of any phase winding not intended as a neutral shall be given a number determined by counting from Xl, X2, or X3 and not from X4, X5, or X6. For example, if the only taps brought out are 50% starting taps, they shall be numbered X7, X9, and Xll. , from X6 toward X2 See Figure 23(f). 7. 1 General On the basis of two power or source systems (hereafter referred to as systems), one with phase terminals arbitrarily designated by A, B, C, and the other by a, b, c, the phase displacement of “a” with respect to “A” may be from 0˚ to 330˚ in steps of 30˚.

In order that the markings of terminal connections between phases will indicate definite phase relations, they shall be made in accordance with one of the four six-phase groups shown in Figure 23, Group 1 and Group 2. The angular displacement between the three-phase and six-phase windings is the angle in each of the voltage phasor diagrams from its neutral through H1 and X1, respectively. 2. , from X2 toward neutral Copyright © 2001 IEEE. All rights reserved. , from X6 toward neutral See Figure 23(e).

All rights reserved. , from X6 toward neutral See Figure 23(e). A tap from the middle point of any phase winding not intended as a neutral shall be given a number determined by counting from Xl, X2, or X3 and not from X4, X5, or X6. For example, if the only taps brought out are 50% starting taps, they shall be numbered X7, X9, and Xll. , from X6 toward X2 See Figure 23(f). 7. 1 General On the basis of two power or source systems (hereafter referred to as systems), one with phase terminals arbitrarily designated by A, B, C, and the other by a, b, c, the phase displacement of “a” with respect to “A” may be from 0˚ to 330˚ in steps of 30˚.

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