PS810 pdf datasheet The contents of this supplement will be incorporated into IEEE Std C37.081 in a future edition. At that time figures and tables will be labeled sequentially. This supplement is intended to be used in conjunction with IEEE Std C37.081- 1981. Editing instructions necessary to incorporate this supplement into IEEE Std C37.081 are provided in bold italics. 8.3.2 Recovery voltage for terminal faults; asymmetrical short-circuit current Replace subclause 8.3.2 with the following: The transient recovery voltage rate R and peak E2, together with the di/dt of the current at current zero for asymmetrical faults needs to be modified in accordance with the degree of asymmetry of the fault current. The normal power frequency recovery voltage is sinusoidal with a value equal to that of the symmetrical fault current case. The basis of rating for asymmetrical faults is a fully offset current with a decrement based on an X/R of 17. The total current dc component and voltage are shown in Figure 8.3.2-1 for this condition. From this it can be seen that current zeros occur at the times shown in Table 8.3.2-1 with the corresponding degree of asymmetry D.
