Toshiba GR200 Series Instruction Manual page 142

Line differential protection ied

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Z1G-DX.Angle

Z1G-R.Reach (in the left)

in Figure 2.10-27.

a. PSBSIN and PSBSOUT in ZS

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

ZGF-X.GrAngle2

Z1G-DR.Angle

Z1G-R.Reach (in the right)

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

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

6F2S1914 (0.49)

b. PSBGIN and PSBGOUT in ZG

GRL200 (Soft 033 & 037)

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