- 119 -
PSB constructed with ZS and pivoted ZS
Figure 2.10-26 PSB characteristic made with only forward ZSs
The case of the Quad characteristic is similar to that of the Mho characteristic, as shown
in Figure 2.10-27.
a. PSBSIN and PSBSOUT in ZS
b. PSBGIN and PSBGOUT in ZG
Z1G-R.Reach (in the right)
Z1G-R.Reach (in the left)
Figure 2.10-27 Example of PSB element in Quad characteristic
Figure 2.10-28 shows the PSBS-out and PSBS-in logic. During a power swing, the
impedance viewed from the PSB elements passes through the area between the PSBSOUT and
PSBSIN in a certain time. In the event of a system fault, the impedance passes through this
area instantaneously. A power swing, therefore, can be detected in the time that the locus of
To Next Page
Loading...
